| |
| |
|
softwarecatch.com
|
|
|
|
Cisco Certification: Introduction To ISDN, Part III
Configuring PPP PAP Authentication Now we know how the ISDN link comes up (interesting traffic), and some scenarios that might cause the link to stay up, we need to look at ISDN authentication schemes. The two methods Cisco certification candidates must be familiar with are PAP and CHAP. Password Authentication Protocol (PAP) sends the username and password over the ISDN link in clear-text. Sending any passwords over any WAN link in clear-text is generally a bad idea, but itâ??s important to know you have this option. Regarding both PAP and CHAP, itâ??s a common misunderstanding that each side must authenticate the other. PAP and CHAP both support bidirectional and unidirectional authentication that is, R1 can authenticate R2 without R2 necessarily authenticating R1. Itâ??s more common to use unidirectional authentication in a lab environment than a production network, but keep in mind that bidirectional authentication is an option, not a requirement. The configurations of PAP and CHAP do have their similarities. For both, youâ??ll configure a username/password combination in global configuration mode. Newcomers to ISDN sometimes put the local router name in for the username remember that the remote router name is the username. The only real advantage of PAP over CHAP comes in the password configuration. Since PAP actually sends the password as a whole over the link, the two routers can send different passwords during authentication. The operation of CHAP requires that both routers use the same password, and weâ??ll see why in tomorrowâ??s article. Under the BRI interface, youâ??ll enter encapsulation ppp and ppp authentication pap. So far, your authentication scheme looks like this: username R2 password CCNA Int bri0 encapsulation ppp ppp authentication pap PAP requires an extra command at this point. The ppp pap sent-username command is required under the interface, indicating the username and password this router will be sending to the remote router. Int bri0 encapsulation ppp ppp authentication pap ppp pap sent-username R1 password CISCO I always encourage CCNA and CCNP candidates to use as many debugs as possible when working in their lab, since these commands show us how things work. For any PPP authentication, always run debug ppp negotiation before sending interesting traffic to trigger the call. Watching exactly how PAP and CHAP work give you a much better understanding of whatâ??s going on â??behind the commandâ??, and makes you a stronger candidate and a stronger networking engineer. Tomorrow, weâ??ll take a look at CHAP, and why routers cannot use the same password on both ends of the link. Keep studying! About The Author: Chris Bryant, CCIE (TM) #12933, has been active in the Cisco certification community for years. He worked his way up from the CCNA to the CCIE, and knows what CCNA and CCNP candidates need to know to be effective on the job and in the exam room. He is the owner of http://www.thebryantadvantage.com, where he teaches CCNA and CCNP courses to small groups of exam candidates, ensuring they each receive the individual attention they deserve. Classes are offered over the Internet and in person in select cities. Chris has custom-written the Study Guide and Lab Workbook used in each course - no third-party training materials or simulators are used. You're invited to visit our site and check out our CCNA and CCNP Courses, Flash Card Books, and to sign up for our weekly newsletter written personally by Chris. Chris is always glad to hear from Cisco certification candidates at chris@thebryantadvantage.com.
MORE RESOURCES:
Quest Software's Shares Changing Hands at Higher Prices on 1.2x Above-Average ... - Comtex Smartrend
Google News |
|
|
|
RELATED ARTICLES
How to Make Attractive and Effective PowerPoint Presentations Microsoft PowerPoint has dramatically changed the way in which academic and business presentations are made. This article outlines few tips on making more effective and attractive PowerPoint presentations. Microsoft Great Plains: Offshore Customization & Development - Overview for Consultant When you visit department stores and see that majority of the apparels are produced in other countries, not US - you probably do not worry about this fact. About 10 years ago, when Clinton's high tech era was at the inception - we saw the signs of high tech professionals inflow in the USA from overseas. Theres Gold in Your Websites Server Log Many Webmasters have never bothered to view their website's server log. Ignoring your server log is like flying with a blind pilot. Software Tools To Help Your Business Sell More Sales are all about leverage, because there is only so much you can do on your own. But, with the help of these simple tools, you can easily double, triple and quadruple your productiviting and make more sales. Software Engineering: An Introduction Software Engineering is the Systematic Approach for analysis design implementation and maintenance of Software .It involve the use of Case tools. Great Plains DOS Support - Notes for Consultant Great Plains Accounting, accounting package for mid-size and small companies was in its peak of popularity back in earlier 1990th. It first had DOS interface, later on migrated to classic Windows version (remember earlier event driven Windows and its strange and at the same time revolutionary programming model - guys who remember Borland C++ and Microsoft C++). Off The Record - Tips For Picking Recording Software Need software to record your voice, streaming audio or musical instruments? There are dozens of great products on the market. Some cost up to five hundred dollars, but here are some of the low cost alternatives you might want to consider. The Secret of the Layer Styles Dialogue When you double-click a layer in the Layer Palette, you will access the Layer Style dialogue box. Here, you can set many eye-catching layer styles such as Bevel & Emboss, Drop Shadow, Inner Shadow, etc. Dashboard Widgets for Windows For a windows user like me, just can watch with envy the new eye candy features in Mac OS X and wondering how I can have the same feature on my belove windows.Before Apple introduce dashboard in their latest Mac OS X, most of mac users already can have widget on their desktop using Konfabulator by Pixoria Inc. How To Create A Data Capture Procedure Checklist For Your Small Business CRM Software Fortunately one of the most common reasons cited for the high failure rate of CRM systems - poor data quality - is also one of the easiest to avoid. Your CRM software is only as good as the information it contains. Perfectly New Database Query Tool - Foxy SQL Pro Released Are you a database professional? Do you work with a lot of databases? Do you use an SQL code? Do you want to connect to a new database to physically create its structure in no time and with ease? Are you tired of having to handle several client applications?If your answer is "yes" to any of these questions, I recommend you to go on reading this article.Let's imagine you work with let's say three databases. Inherent Dangers Of File Sharing Via The Internet. Cyberspace has opened up a new frontier with exciting possibilities of "File Sharing." We can explore any interest imaginable and research any topic of choice. Programming Environments And The Software Production Process Introduction: The creating of a computer program involves a number of stages which can be made easier with several separate software utilities. There are now integrated set of support programs which combine all the necessary utilities to provide a complete program development environment. Will Adobe Manage to Replace Industry Work Horse Quark Express by Giving Adobe InDesign for Free? And kill the best layout software in the process of gaining market share?*** Heard about the Quark "killer"?Adobe InDesign CS2. Will it really "kill" Quark? Adobe has been saying "it will" for the last six years or so, but it hasn't happened. MySQL for Beginners - How to Create a MySQL Database Whether you are an experienced web programmer or a complete novice attempting to provide data interactivity with your web site, MyQSL is an easy to use and free database solution that can allow you to store and configure data to be displayed on your web site.The best way to create and manage a MySQL database is to download an open source (free) program called PhpMyAdmin. Brief Notes About Mainframe Software Pricing We don't think about mainframe software pricing anymore, we just go out buy a server hardware/software "package" from Microsoft, but did you ever tink about how they got their ideas for the usage licence, it all started with IBM and the introduction of Cmos logic technology in 1994, simnce then mainframe software pricing has steadily became disproportion to the comparatively minute hardware costs, which has been stated to be "typically four to five times the hardware cost" in terms of the system budget.This trend has given rise to growing concerns over the direct results of current software pricing techniques which are leading to problems such as making smaller applications costly to operate on large systems. Free Microsoft Word Online Training Tutorial Resources Microsoft Word is one of the most popular office applications that provide many features such as word processing, web publishing and database creation. Tapping into these Word resources, however, is not always easy and straightforward, leaving users stumped and puzzled. Imagine if Everyone Working In Your Office Was In Synch? Microsoft-Outlook is a pretty amazing program. So much more than simply an e-mail client, it provides a task list, a powerful calendar with recurring scheduling capabilities, wonderful electronic sticky notes, mail-merge capability with MS-Word support and so much more. Recovering Microsoft Great Plains Customization - Tips for IT Director Remember nice and prosperous Clinton era? When you implemented innovative those old days accounting application - Great Plains Dynamics. And did a lot of customizations to fit your business requirements precisely. Interactive Mapping Brings Information to Life What is Interactive Mapping?Interactive mapping is a visual display medium which allows graphing, mapping, and even conversion to PDF of any type of information. This technology is used by national government agencies, airlines, chambers of commerce, ski resorts, and countless corporations to make information accessible and interactive to whomever they present the information.
|
|
Powered By: Free Work At Home Business Opportunity! |
| © 2006 |
