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Occasionally, in the course of your CCNA and CCNP studies, you'll run into a term that just does not quite make sense to you. (Okay, much more than occasionally!) 1 such phrase is "reverse telnet". As a Cisco certification candidate, you know that telnet is merely 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 residence lab setup?

Exactly where a telnet session is started by a remote user who wants to remotely handle a router or switch, a reverse telnet session is started out when the host device itself imitates the telnet session.

In a CCNA / CCNP house lab, reverse telnet is configured and utilised on the access server. The access server isn't a white box server like most of us are utilized to an access server is a Cisco router that makes it possible for you to connect to numerous routers and switches with a single session with no possessing 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 residence lab. The octal cable has one particular large serial connector that will connect to the access server, and eight rj-45 connectors that will connect to your other property lab devices. Your access server then requirements an IP Host table in order to carry out reverse telnet.

An IP Host table is straightforward to put together (and you far better know how to write a single to pass the CCNA!). The IP Host table is utilised for nearby name resolution, taking the spot of a DNS server. A standard access server IP Host table looks like this:

ip host FRS 2007 100.1.1.1

ip host R3 2003 one hundred.1.1.1

ip host R1 2001 100.1.1.1

ip host R2 2002 100.1.1.1

ip host R4 2004 100.1.1.1

ip host R5 2005 100.1.1.1

ip host SW1 2006 100.1.1.1

interface Loopback0

ip address one hundred.1.1.1 255.255.255.255

no ip directed-broadcast

This configuration will allow you to use your access server to connect to 5 routers, a frame relay switch, and a switch without ever moving a cable. When you kind "R1" at the console line, for instance, you will be connected to R1 by means of reverse telnet. If you have a smaller lab, an access server is nonetheless a actual timesaver and an outstanding investment. And by obtaining a static IP address to put on your access server, you can even connect to your residence lab from remote areas! Sometimes, for the duration of your CCNA and CCNP research, you'll run into a phrase that just does not quite make sense to you. (Okay, a lot more than sometimes!) 1 such phrase is "reverse telnet". As a Cisco certification candidate, you know that telnet is just a protocol that permits you to remotely connect to a networking device such as a router or switch. But what is "reverse telnet", and why is it so crucial to a Cisco CCNA / CCNP residence lab setup?

Exactly where a telnet session is began by a remote user who desires to remotely manage a router or switch, a reverse telnet session is began when the host device itself imitates the telnet session.

In a CCNA / CCNP residence lab, reverse telnet is configured and used on the access server. The access server isn't a white box server like most of us are employed to an access server is a Cisco router that permits you to connect to several routers and switches with one particular session with out 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 residence lab. The octal cable has a single big serial connector that will connect to the access server, and eight rj-45 connectors that will connect to your other residence lab devices. Your access server then demands an IP Host table in order to carry out reverse telnet.

An IP Host table is easy to place together (and you much better know how to write one to pass the CCNA!). The IP Host table is used for nearby name resolution, taking the place of a DNS server. A typical access server IP Host table looks like this:

ip host FRS 2007 one hundred.1.1.1

ip host R3 2003 100.1.1.1

ip host R1 2001 one hundred.1.1.1

ip host R2 2002 one hundred.1.1.1

ip host R4 2004 100.1.1.1

ip host R5 2005 100.1.1.1

ip host SW1 2006 100.1.1.1

interface Loopback0

ip address 100.1.1.1 255.255.255.255

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 with out ever moving a cable. When you variety "R1" at the console line, for instance, you will be connected to R1 by means of reverse telnet. If you have a smaller sized lab, an access server is nevertheless a actual timesaver and an excellent investment. And by acquiring a static IP address to put on your access server, you can even connect to your home lab from remote areas!