Archive for the 'Hall Of Technology' Category

Gaming Laptops To Turn Sleek And Light

Laptop computers seem to be the current trendy thing this year. Taiwanese companies have said part scarcities will affect fullfilment this year due to the massive demands. This is one trade which in my opinion will not be affected with all the economic crysis that seems to be going on. The technology is advancing in all directions at once too.

There seems to be a lot more selection and attainability of gaming laptops these days. If you’re a games player with a tiny budget the good thing is that you can get a gaming laptop a lot less expensive now because the longevity is dropping. In my opinion laptops are reasonably good for gaming. Performance is much advanced than before. Past obstactles with giant, over heating laptops for gaming are disssapearing and new sleeker, slicker models are being launched. Still there is a great gap between the speed of portables and desktop pcs however desktops are more spacious to cater for ample cooling and airflow that all help. It will be intriguing to see what gaming laptops come out in the future and how portable they can manufacture them.

Although the market share is governed by brands marketing via retail outlets I think the direct model and custom built laptops will forever be about. With bigger companies you usually don’t have a clue what they put into the laptop computer. With that in perspective you normally get to spec the processor, memory, hard drive and operating system. Mass market laptops aren’t made with niche customers in mind and this could raise a problem. Custom laptops give a solution to this. You can a number of companies who sell direct so there are a lot of alternatives too. I surely think this is a prime point that goes in favour for buying a laptop thats made to .

Next generation notebooks do look like a mouth watering proposition. Basic ultra mobiles are the popular thing. This market is already receiving tons of competition and is becoming saturated. Giant screen and supremely light, that’s what everybody would embrace. Companies must be engaged on a solution to this as we speak. Analysing the trends it seems like gaming laptops will become thinner and more powerful. Manufacturers are always seeking to distinguish themselves in this saturated market so that keeps things progressing.

In my opinion Rizeon have the best laptop computers in terms of value.

Published in: Hall Of Technology | on June 30th, 2008 | Comments Off

PKI - Old Technology has a New Rival

Currently, when most people think of digital signature capturing the first technology that comes to mind is Public Key Infrastructure or (”PKI”). However, the old guard of PKI is a dying technology. PKI is a good solution with serious limitations that will hinder and impede its continued growth. PKI is both expensive to implement and expensive to maintain. PKI is also time consuming. Professionals do not want to slow down the sales cycle to send someone to a third party certificate authority just to make a sale.

PKI authenticates but it fails to identify who a user is. The American Bar Association identified this critical weakness in its ABA PKI Assessment Guidelines, D.3.1.2 says “a pseudonym or alias may be used as the name within a certificate” and not their real name.

VeriSign, one of the largest PKI solution providers, admits in their paper “ROI for PKI” that “PKI systems are particularly expensive to maintain.”

A Better Solution

By giving power to the business and not a third party certificate authority, PrivaSign can aid businesses trying to comply with regulatory law and standards similar to the ABA Guidelines pertaining to electronic signatures.

The vast majority of electronic signatures are captured through a method called “click-wrap”. People use this method every time they install new software or purchase something online using a credit card. The system will validate their identity and then require the user to click an “OK” or “I Accept” button to install the software or authorize a credit card transaction. The reason most people use the “click-wrap” process is in its simplicity. There is no training required and most users get comfortable with the process after just one use. Click-wraps have been tested in the courts by dozens of companies, including AOL-Time Warner, Microsoft, Netscape, Sun Microsystems and Dell just to name a few. The technology necessary to use the product is built directly into web browsers so there is no software to install. Finally, it is significantly less expensive to maintain, install and process than traditional PKI technologies.

PrivaSign uses a patented, proprietary “click-wrap” method to capture the actual signature and the industry standard form of encryption known as Secure Socket Layer (”SSL”) technology, along with MD-5, SHA1 and SHA2 file integrity hashes to protect the PrivaSign client’s data with a tamper proof seal. SSL is commonly available in virtually every web browser and the user does not need any special training or instruction in order to use the service.

PrivaSign’s patented technology allows for fast digital signature capturing on virtually any document and from any web browser. This flexibility will allow businesses to keep implementation costs at a minimum and increase the likelihood that signatories will be able to use the system.

Isaac Bowman - EzineArticles Expert Author

By: Isaac Bowman

Isaac Bowman is Vice President of the Electronic and Digital Signatures International Standards Commission and an IT business consultant. He graduated form UT of Dallas with a major in Information Systems. Isaac Bowman has published over 50 articles on electronic signatures and completed the largest online resource for electronic signature laws and regulations.

articles@isaacbowman.com
http://www.isaacbowman.com

Published in: Hall Of Technology | on June 13th, 2008 | Comments Off

The Quantum Theory of Holy Languages

The quantum theory of holy languages (QTHL) encompasses the three most influential fields of knowledge: science kabbalah, quantum physics and mathematic. Applications of this theory in alternative medicine by use existing human experience has many practical statements. In essence, all of QTHL is founded on following fundamental presuppositions:

1. Electricity and magnetic energy exist in the human body, controlling the heartbeat, stimulating muscles, etc. Each molecule in the human body actually contains a small amount of electricity and magnetic energy. Every cell resonates at a particular frequency. Our physical, mental, emotional, and intuitive energies are corresponding to the unique electromagnetic vibrations.

2. The processes that within a human being and between human beings and their environment are managed by electromagnetic vibrations.

3. Indicium’s, human society, the nature and universe form ecology of complex systems and sub-systems all of which interact and mutually influence each other through electromagnetic vibrations

4. The Holy Hebrew is the unique language based on kabalistic sources. The letters and words in Hebrew are coded by a special way. This code describes the harmony of electromagnetic vibrations of light.

5. The sacred texts are coded by codes of electromagnetic vibrations of light, which are depended from properties of letters, words and phrases in Holy Hebrew.

6. The sacred texts codes describe the harmony of colors, as the proportional correlations of RGB (red green blue).

7. Healing Colors Environment is formed by use of the proportional correlations RGB and practical information around psychology of colors and therapeutic properties of colors

The quantum theory of holy languages is addressing to the unique properties of Holy Hebrew in order to coming to conclusive proofs how electromagnetic vibrations and universal harmony of colors are coded in sacred texts. Electromagnetic vibrations or electromagnetic healing is one of the most profound and fundamental alternative therapies in the field of alternative medicine and holistic health that includes bio resonance, sound therapy, color therapy, bio electromagnetic fields etc Therefore this theory have a potential to offer numerous innovations in future.

Wezit develop models of Healing Colors Environment in virtual reality by quantum theory of holy Hebrew. We make both, Software (Emotional player) and scripts using Healing Colors Environment. This very powerful tools to apply in a wide range of professional areas including hypnosis, psychotherapy, education, health, creativity, art, design etc For more information, please check out http://www.visnsoft.com

Shaul Baskin, Mathematician, CEO and founder company Wezit. Initiator of high-tech projects related to the quantum theory of holy languages. Developer and inventor new mathematical methods, algorithms and software related to the quantum theory of holy languages.

Published in: Hall Of Technology | on June 3rd, 2008 | Comments Off

Can Intelligent Design Be Science?

How did our universe come into existence?

The question of how our universe came into existence has mystified scientists, philosophers and lay thinkers for centuries. The fact that we are here, suggests an origin. Yet the universe’s origin, from a scientific perspective, is far from clear-cut or obvious. Even more puzzling is that in this age of high-tech, when we can peer into vast regions of space, penetrating literally billions of light-years into the cosmos, as well as observe phenomena on the microscopic and atomic levels, the origin of our universe is still not that obvious.

Or is it?

Is it possible that the origin of our universe is staring us right in the face and we don’t see it? Like the old murder mystery about the police who question the postman for hours as to who he saw near the house on the day of the murder. But it never occurs to them that the postman might be the murderer.

When confronted with questions about the origin of the universe, scientists usually speak of the “big bang.” In 1929, astronomer Edwin Hubble published his finding that the universe is expanding. That is, in any direction you look up into the sky, you will find that most stars are flying away from us.

Hubble’s discovery led to an extrapolation of where all matter in the universe might have begun. If the direction of all the galaxies flying apart were reversed, it appeared that everything would meet at one point. At some distant past, scientists believe, all matter in our universe began at that one single point, exploded, and, thus, the “big bang.”

Scientists also believe that the laws of nature at the moment of the big bang must have had some remarkable properties. All matter in the universe being condensed into such a small area would have produced something called a “singularity” — a point of infinite density in which, much like the inside of a black hole, time and the laws of nature, as we know them, cease to function. And it is this singularity that prevents the formulation of theories about the universe prior to the big bang — if the big bang totally distorted the laws of nature, there’s no telling what “nature” might have been like prior to that.

Some view the big bang as science’s answer to our origin, other’s view the complexity of our universe as proof of a Creator. These two camps have held their ground for many years now, and a “Time Magazine” article entitled “Science, God and Man” pretty much reflected these ongoing contentions.

At one point, the Time article seems to maintain that our ability to decipher some of science’s mysteries and complexities seem “enough to dampen a person’s hopes for higher meaning.” The very next paragraph makes the paradoxical statement that “looking at the big picture … there is more to this universe than meets the eye, something authentically divine about how it all fits together.”

A deeper analysis of this subject matter, however, might demonstrate how some of the above contentions are simply wrong. The big bang answers very little. Describing the complexities of our universe is not at all necessary to ponder the existence of a Creator, and solving some of science’s mysteries does not in any way detract from the need for a Creator.

To begin with, the entire big bang scenario only adds a step to the question of “Where did we come from?” The big bang refers to only one point in time. The originating force that gave the big bang its power and potency would be the key to “where we came from.” Of course, you could add several more steps, as scientists sometimes opt to do, almost in seriousness, that there may have been other universes before or parallel to ours. But this only adds unverifiable assumptions, clouds the issue and solves nothing.

To talk about a “beginning” you have to go back to a time before which literally nothing existed. And this is what science does not and cannot do.

The universe we live in gives every indication of having “come from somewhere.” The laws of nature dictate this. Nothing in our universe seems to have the ability to create or destroy itself. Matter and energy only go through transformations, with no elementary (subatomic) particle components gained or lost, in the big scheme of things. A fire may destroy a house, but every subatomic component that encompassed the house is still in existence after the fire. An atomic bomb may destroy an entire city, but only in the form of a transformation, no substance is actually lost to some exotic void.

In the same vein, nothing in our universe is ever created. Stars are formed (of gas), they do not “create” their constituent components. Meteorites are formed (or chipped off larger bodies), they do not “create” rock or ice. Apple strudels are baked, they do not come from strudel machines.

This leaves us with a very serious dilemma. Based on known laws of nature — that nothing can create itself — our universe shouldn’t exist. But it does.

At one point, scientists thought they had the answer when they observed subatomic particles appearing from “nowhere.” It seemed only logical that if enough subatomic particles created themselves they would eventually form an entire universe.

This notion, however, of “something” coming from “nothing” is neither logical not scientific. The entire concept of “nothing” implies complete and utter nothingness — nothingness not only in substance, but also in potentiality. Something that has the potential to produce anything, even if at present it has no observable form or properties, is obviously not “nothing” — it is apparently a latent force of some kind.

Furthermore, to verify that “something” came from “nothing,” you’d have to prove that there was in fact nothing there to begin with. And that’s impossible. For “detecting nothing” can always mean that your experiment or apparatus is simply not sophisticated enough. In fact, the very fact that something seems to suddenly appear from “nowhere” is, ironically, concrete proof that something actually does exist where you think there is nothing.

And this is precisely what scientists discovered in the above case. As science became more sophisticated, it became apparent that what scientists previously thought came from “nothing” was actually a transformation of a more basic or subtle form of subatomic substance into a form more readily detectable with cruder observational methods.

So, the question of “Where did our universe come from?” isn’t just some idealistic venture into the realm of metaphysics. It isn’t just some exercise in nonsensical philosophical deliberation. It isn’t a “complex” scientific question which we may have the answer to in the future. It is, scientifically speaking, a profoundly disturbing question which the laws of nature themselves indicate is unanswerable. No matter how long you claim the universe has been in existence, no matter how powerful that big bang may have been, no matter what kind of transitions the laws of nature may have gone through during that big bang, at some point in the past all the stuff of the universe (or universes) had to come into existence. How?

The only possible explanation is that the ultimate origin of everything that exists must have been from a source that is itself not bound by our laws of nature. A source which did not necessarily have to “come from” anywhere. This may not be an easy concept to comprehend. But the alternative leaves us with the completely irrational, unscientific and absurd notion that in spite of the fact that our universe exists, there was no way for it to have come into existence.

At this point, to start entertaining the thought of a Creator isn’t simply a “convenience,” a “way out,” a “fanatical” view, or even “religious dogma.” It is a very realistic, necessary and logical step in explaining our existence. Furthermore, it can even be classified as science. The concept of a Creator is no more removed from science than the notions of “other universes,” the inner workings of black holes, the laws of nature at the moment of the big bang, and a host of subatomic particles that scientists spend literally millions of dollars trying to track down that never pan out. These scientifically unverifiable concepts, based solely on logical deductions, are quite clearly entertained by bona fide scientists. Then why not the “theory” of a Creator? What can be more logical than the notion that a universe with laws of nature that preclude its own creation to have been brought into existence by a Creator? And what alternative would be more logical or scientific?

Apparently, the inclination to avoid a Creator at all cost by some, constitutes nothing but an extreme form of bias. It has nothing to do with logic or science.

Getting back to the Time article: That scientific advances are somehow “enough to dampen a person’s hopes for higher meaning” is totally absurd. The need for “higher meaning” (a Creator) does not stem from the complexities of our universe. It stems from the simple fact that the universe exists. What’s more, if the entire universe contained nothing but one spec of dust, it would suggest a Creator, since the spec of dust could not have created itself. If the universe contained an imponderable amount of mass and energy, as it does, but none of it in any complex or aesthetic form, it would most certainly suggest a Creator. So by the time you get around to talking about complexities, you’ve already gone way past the point of establishing the fundamental need for a Creator. The complexities, at that point, far from “dampening hopes for higher meaning,” go a long way in describing the power, resourcefulness and ingenuity of the already-inferred Creator. And the more complexities you decipher, the more brilliant a Creator you establish.

Personally, I think one of the most brilliant aspects of Creation is, ironically, those people who don’t believe in God. To Create an intelligent person, put him in the midst of a universe that seems almost limitless in space, energy and matter, give him the scientific capability of deciphering some of the universe’s complexities and secrets, and, at the same time, endow him with an emotional feature that somehow gives him the capacity to deny that any of this required a Creator, is about as brilliant as the implementation of “free will” can get.

by Josh Greenberger
Get his free book on evolution at EvolutionDead.com.

shopndrop.com

Josh Greenberger: A computer consultant for over two decades, the author has developed software for such organizations as NASA’s Goddard Institute of Space Studies, AT&T, Charles Schwab, Bell Laboratories and Chase Manhattan Bank. Since 1984, the author’s literary works have appeared in such periodicals as The New York Post, The Daily News, The Village Voice, The Jewish Press, and others. His articles have ranged from humor to scientific to topical events.

Published in: Hall Of Technology | on May 30th, 2008 | Comments Off

Use Internet Phone Service to make cheap calls worldwide

Have you ever heard of an Internet phone?
If not, get prepared to change the way you think about long distance phone calls. You can actually use your Internet connection to make cheap telephone calls anywhere in the world. Today we find several Internet phone service providers across the world that provide this service at little or no cost and can help you reduce your phone bills drastically.
Over the last decade, we have seen that the Internet and computer technology have changed the way people live, work and communicate. An Internet phone is one such revolution that has changed the way people talk with each other.

How does an Internet Phone work?
An Internet Phone uses Voice over Internet Protocol (VoIP), which converts the voice signal from the telephone to a digital signal. This digital signal travels over the Internet and is converted back at the other end to voice so that you can speak to anyone with a regular phone number. VoIP sends voice information in digital form in discrete packets rather than in the traditional circuit based protocols of the public switched telephone network (PSTN) and helps you use your standard Internet connection to make phone calls worldwide at a very low or no cost.

How to make a call using the Internet Phone?
To make a call using an Internet Phone, you can subscribe to an Internet Phone Service. Besides this, you need to have a good speed Internet connection in place. Some Internet Phone services allow you to use a regular telephone, as long as you connect it to an adaptor while others allow you to make calls from a computer or a special VoIP phone that doesn’t require an additional adapter.

Depending upon the service that you choose, one way to make a call is to pick up your phone and dial the number, using an adaptor that connects to your Internet connection. Another way is to use a microphone headset plugged into your computer. In this case, the number is dialed using the keyboard and is routed through the cable modem.
In fact your computer need not even be turned on in case you are making calls with a phone and adaptor or special VoIP phone. It’s just that your Internet connection needs to be active. You can even use your computer while you are talking on the phone.

How to choose an Internet Phone Service?
Depending upon the Internet Phone service that you choose, you might be limited only to other subscribers to the service, or you may be able to call any phone number, anywhere in the world. The call may be made to a local number, a mobile phone, a long distance number, or an international number. You can even utilize the service for a conference call, that is, to speak with more than one person at a time.

Different Internet Phone Service providers offer various plans for making calls. Some providers offer their service for free, normally only for calls to other subscribers to the service. While others charge for a long distance call to a number outside your calling area, similar to the existing, traditional telephone service. Still some other providers permit you to call anywhere at a flat rate for a fixed number of minutes.
Before choosing an Internet Service Provider you have to carefully look at his offering and balance it with your needs.

Benefits of using an Internet Phone Service

The biggest benefit of using an Internet Phone is that you can make cheap phone calls as you are utilizing an existing data network that is the Internet. Moreover since VoIP is digital, it offers features and services that are not available with a traditional phone. It gives you the flexibility to combine phone calls with business data and offers value added features like integration with software on your computer.
The Internet Phone also provides you with the ability to be mobile as you can take your phone anywhere in the world. Besides this, it provides you access to features like voice mail, caller ID, call conferencing, call forwarding etc.

The Flip side…. disadvantages
Despite the numerous advantages that an Internet phone offers, there are some disadvantages to utilizing the service. First, an Internet Phone is dependant on power. Your current phone runs on power that is provided over the line from the central office, so even if your power goes out, your phone connection still works. With an Internet phone, you cannot use your phone service in case there is a power failure. Unlike using traditional PSTN technology, that is dependent on a point-to-point connection, the Internet Phone utilizes the Internet and its web-like, multi-link network. Therefore if a traditional PSTN circuit phone line is down or cut for some reason, you will be unable to make a call. With Internet Phone service, if a specific link is down, the call will just be routed over one of the many other routing options that the Internet provides to still complete the call. There have been many recent natural and man-made disasters, where Internet Phone Service, was the only available and working service - as both PSTN lines and mobile cellular towers were rendered inoperable.

Additionally, early Internet Phone Service suffered from issues of “delay” which causes the problem of “echo” and “talk overlap”. These initial Internet Phone Service offerings were susceptible to all the problems normally associated with home Internet connections like latency, jitter and packet loss. Due to all these factors phone conversations can sometimes become distorted, garbled or lost. In the last few years, with the improvements to the Internet backbone, broadband technologies and VoIP protocols and codecs, most of these issues have been corrected.

Author : Bart Bartolozzi
http://www.BlueSkyPhone.com/
Broadband Phone Service

Published in: Hall Of Technology | on May 27th, 2008 | Comments Off

Telescopes - Principle of Operation and Factors that Affect Its Properties

Telescopes are devices that are used to view the distant objects. They find its use in astronomy and physics. It enables you to view the distant objects by magnifying them. There are many types of telescopes and their prices vary according to the specifications. Many accessories are also available that can be used in conjunction with the telescopes. Small telescopes that are used as toys are also capable of viewing some objects around 50 meters away.

Principle in which the telescope works

The principle in which the telescope works is very simple. There are two lenses that make up the task of viewing the objects that are at a distance. One of the lenses picks up the light from the object viewed and makes it available at a focus point. Another lens picks up the bright light from the focus point and spreads it out to your retina so that you can view. The lens that picks up the light from the object is called the objective lens or primary mirror. The lens that picks up the light from the focal point is called the eyepiece lens.

Factors that affect the viewing of the object

The capability of the telescope to collect the light from the object that is viewed and the capability to enlarge the image are the factors that affect the efficiency of the telescope. The capability to collect light from the object depends on the diameter of the lens or mirror, which is otherwise called the aperture. The larger the aperture the more the light it can collect. Enlarging of an image depends on the combination of the lenses that are used. The eyepiece in the telescope performs the magnification.

Some of the world’s largest optical telescopes in operation

We say a telescope to be larger based on the aperture size. Based on this we can say that Keck and Keck II are the largest telescopes in operation with an aperture of 10 meters diameter. The Keck telescope is composed of 36 mirror segments. This is located at Mauna Kea, Hawaii. The next largest is Hobby-Eberly located at Mt. Fowlkes, Texas which has an aperture of 9.2 meters. You can get a list of the largest optical telescopes at http://astro.nineplanets.org/bigeyes.html.

Choosing your telescope

The choice of the telescope largely depends on what you want to observe. You can choose compound telescopes and refractor type of telescope for viewing through the urban skies. For the rural skies, you can use compound telescopes and reflectors. They are better than the refractors type of telescopes. Each type has its own advantages and disadvantages. Hence, many people have different telescope for different purposes.

For more information visit http://www.TelescopeInfoCenter.com

Published in: Hall Of Technology | on May 22nd, 2008 | Comments Off

Effective Data Conversion, Finding Quality

If you have a need for effective data conversion, then it is absolutely necessary to find reliable and trustworthy services to help you with your need. There are several ways that you can go to get the needs you have filled. To find the right solution, though, you’ll need to consider the options that you have and determine the right budget and the right hands on approach you wish to take. Data conversion can be done successfully several ways.

Depending on your specific need, you can find a number of solutions for data conversion. Throughout the web you will find many companies and service professionals that provide solutions for you in data conversion. These services will not only convert data as you need them to, but many will analyze the data for you as well. This can be extremely helpful as it will allow a professional eye to handle your most intricate details. Likewise, these services can cost a good amount as well.

Another option that you have with data conversion is to purchase good quality software. Many types of software can actually handle analysis as well but it often lacks that personal touch. Less expensive than using a data conversion service, this is one route many individuals and businesses go. One way to find the most effective product or service is to use comparison shopping via the web. There are excellent opportunities in data conversion available here.

There are also many information portals now devoted to the subject and we recommend reading about it at one of these. Try googling for “data conversion” and you will be surprised by the abundance of information on the subject. Alternatively you may try looking on Yahoo, MSN or even a decent directory site, all are good sources of this information.

For more information please see www.data-conversion-help.co.uk

Published in: Hall Of Technology | on May 21st, 2008 | Comments Off

Radware Delivers Unprecedented Intrusion Prevention Capabilities and Denial of Service Protection in

DefensePro Proven to Offer Comprehensive href="http://www.radware.com/content/solutions/application-securi
ty/Default.asp" rel="nofollow"> Application Security and Performance
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Helping organizations secure, optimize and ensure performance
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announced that recent independent tests by The Tolly Group
confirm that DefensePro offers comprehensive href="http://www.radware.com/content/products/apsolute_os/default
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Mass Mailing Protection and protection against Evasion
Techniques, that ensure application performance and reliability
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Realizing that application security involves more than strictly
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In standard IPS performance tests, Radware solutions were proven
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to Radware on the company’s integration of Intrusion Prevention
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ability to mitigate SSL-based attacks and SMTP mass mailing
attacks.

“To guarantee both network security and application performance
and reliability, an IPS solution needs to go beyond just
blocking or preventing attacks,” said Assaf Ronen, VP R&D of
Radware. “Advanced security features like bandwidth management
and attack isolation should be a requirement in any IPS
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and performance of their mission critical applications - even
while in the throes of an attack. The Tolly Group’s tests
confirmed that DefensePro’s advanced security features can block
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The Tolly Group tests underscored the unique capabilities of
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DefensePro blocked application attacks at an unmatched speed of
2.5 Gigabits per second by identifying and mitigating protocol
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DefensePro prevented DoS/DDoS attacks and SYN floods,
safeguarding against illicit traffic patterns and hacking.
DefensePro also leveraged a wide range of DoS protection
capabilities including packet-based attacks, TCP, UDP and ICMP
flood protection and DHCP flood protection.

“DefensePro ranks among the strongest providers of IPS solutions
we have reviewed before,” stated Kevin Tolly, president/CEO of
The Tolly Group. “With features like bandwidth management, SSL
and evasion attack capabilities and multi-segment protection,
Radware provides a solid package of cost effective application
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Radware (NASDAQ:RDWR) is the Global Leader in Intelligent
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Radware’s integrated Application Security , Application
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The Tolly Group, an independent testing and strategic consulting
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Additionally, The Tolly Group is recognized worldwide for its
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information on The Tolly Group’s services.

Published in: Hall Of Technology | on April 1st, 2008 | Comments Off

Cisco CCNP / BSCI Exam Tutorial: Using Distribute Lists

To be successful on the BSCI exam and in earning your CCNP, you’ve got to master route redistribution. This isn’t as easy as it sounds, because configuring route redistribution is only half the battle. Whether it’s on an exam or in a real-world production network, you’ve got to identify possible points of trouble before you configure route redistribution - and you need to be able to control redistribution as well. You may have an OSPF domain with 100 routes, but only need to redistribute 10 of them into a neighboring RIPv2 domain. You’ve got to know how to do that, and one method is the use of a distribute-list.

A distribute-list is an access-list that is used to determine what routes can and cannot be redistributed. Distribute-lists let you specify what routes will be filtered from the process. You can use standard or extended ACLs, and you can filter routes that are coming into a routing process or being injected into another process.

In the following example, R1 is redistributing RIP routes into OSPF, but only wants to advertise network 150.1.1.0 /24 to other OSPF routers. An ACL will be written to match that particular network, and then the distribute-list will be written under the routing process. I’m going to show you the IOS Help output for the distribute-list command, and please note that routing updates can be controlled at the interface level or protocol level.

R1(config)#access-list 24 permit 150.1.1.0 0.0.0.255

R1(config)#router ospf 1

R1(config-router)#redistribute rip subnets

R1(config-router)#distribute-list 24 ?

in Filter incoming routing updates

out Filter outgoing routing updates

R1(config-router)#distribute-list 11 out ?

Async Async interface

BRI ISDN Basic Rate Interface

BVI Bridge-Group Virtual Interface

CTunnel CTunnel interface

Dialer Dialer interface

Ethernet IEEE 802.3

Lex Lex interface

Loopback Loopback interface

Multilink Multilink-group interface

Null Null interface

Serial Serial

Tunnel Tunnel interface

Vif PGM Multicast Host interface

Virtual-Template Virtual Template interface

Virtual-TokenRing Virtual TokenRing

bgp Border Gateway Protocol (BGP)

connected Connected

egp Exterior Gateway Protocol (EGP)

eigrp Enhanced Interior Gateway Routing Protocol (EIGRP)

igrp Interior Gateway Routing Protocol (IGRP)

ospf Open Shortest Path First (OSPF)

rip Routing Information Protocol (RIP)

static Static routes

R1(config-router)#distribute-list 11 out rip

Using distribute-lists does guard against routing loops, but they have other purposes. You may have a network segment that should be kept secret from the rest of your company; a distribute-list can filter that segment’s network number from the redistribution process. In this way, distribute-lists serve as a basic form of network security. (Very basic. I wouldn’t sell that firewall on ebay if I were you.)

Keeping such networks out of routing updates and routing tables throughout the network has the side effect of reducing routing update overhead as well.

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Published in: Hall Of Technology | on March 19th, 2008 | Comments Off