Passing The CCNA and CCNP: Three Myths About Cisco Exams
One of the drawbacks to the Internet is that it allows myths and "friend of a friend" stories to spread quickly, and usually the story becomes more exaggerated as it's passed along.
Router on a Stick
For CCNA and CCNP candidates, it's hard not to laugh the first time you hear the phrase "router on a stick". Let's face it, that's a pretty silly term. But as those who have passed the CCNA and CCNP exams know, this is a vital exam topic that you must know how to configure...
The CCNA and CCNP: Home Lab Shopping On Ebay
Whether you're just getting ideas for your Cisco home lab or adding to your existing
lab, ebay is a great place to get ideas for your lab as well as pick up some great
CCNA / CCNP Tutorial: Home Lab Assembly Case Study
Part of your CCNA / CCNP education is deciding what network topology to use when
you're putting together your home lab. Some of you are starting with one or two routers or switches, while others are starting with more.
E1 E2 Routes
OSPF is a major topic on both the CCNA and CCNP exams, and it's also the topic
that requires the most attention to detail. Where dynamic routing protocols such as RIP and IGRP have only one router type, a look at a Cisco...
Wireless Home Networking Choosing The Right One
Are you suffering from a home wireless networking nightmare? There are so many options. 802.11a, 802.11b, 802.11g - what is all that? All you want is to get online on your notebook computer in your living room without...
How To Configure Reverse Telnet
Occasionally, during your CCNA and CCNP studies, youŽll run into a term that just doesnŽt quite make sense to you.
(Okay, more than occasionally!) One such term is "reverse telnet". As a Cisco certification candidate, you know that telnet is simply a protocol that allows you to remotely connect to a networking device such as a router or switch. But what is "reverse telnet", and why is it so important to a Cisco CCNA / CCNP home lab setup?
Where a telnet session is started by a remote user who wants to remotely control a router or switch, a reverse telnet session is started when the host device itself imitates the telnet session.
In a CCNA / CCNP home lab, reverse telnet is configured and used on the access server. The access server isnŽt a white box server like most of us are used to; an access server is a Cisco router that allows you to connect to multiple routers and switches with one session without having to move a rollover cable from device to device.
Your access server will use an octal cable to connect to the other routers and switches in your home lab. The octal cable has one large serial connector that will connect to the access server, and eight rj-45 connectors that will connect to your other home lab devices. Your access server then needs an IP Host table in order to perform reverse telnet.
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An IP Host table is easy to put together (and you better know how to write one to pass the CCNA!). The IP Host table is used for local name resolution, taking the place of a DNS server. A typical access server IP Host table looks like this:
ip host FRS 2007 126.96.36.199
ip host R3 2003 188.8.131.52
ip host R1 2001 184.108.40.206
ip host R2 2002 220.127.116.11
ip host R4 2004 18.104.22.168
ip host R5 2005 22.214.171.124
ip host SW1 2006 126.96.36.199
ip address 188.8.131.52 255.255.255.255
no ip directed-broadcast
This configuration will allow you to use your access server to connect to five routers, a frame relay switch, and a switch without ever moving a cable. When you type "R1" at the console line, for example, youŽll be connected to R1 via reverse telnet. If you have a smaller lab, an access server is still a real timesaver and an excellent investment. And by getting a static IP address to put on your access server, you can even connect to your home lab from remote locations!
About the Author:
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com),
home of FREE CCNA and CCNP tutorials and The Ultimate CCNA Study Package. (CCNP
Study Packages are on the way!) Video courses and training, binary and subnetting
help, FREE tutorials, and corporate training are also available.