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02.16.06
Four Important Commands For Your CCNA / CCNP Home Lab
 By
Chris Bryant
More CCNA and CCNP candidates than ever before are putting together their own
home practice labs.
It´s more affordable than it ever has been, and I receive emails daily from new
CCNAs and CCNPs who say it´s the best thing they could have done to improve their
studies.
There are some commands you can configure on your lab routers that won´t necessarily
be on your CCNA or CCNP exams, but they will make life a lot easier for you. Let´s
take a look at just a few of these.
The command "no exec" is short, yet powerful. Occasionally you´ll have what is
referred to as a "rogue EXEC" process tie up a line, and you end up having to
continually clear lines, which disrupts your practice. If you have an access server,
I highly recommend you configure this command on your lines, as shown here:
ACCESS_SERVER(con)#line 1 8
ACCESS_SERVER(con)#no exec
>From your CCNA studies, you know that the
command "no ip domain-lookup" prevents a Cisco router from sending a broadcast
to find a DNS server anytime you enter something that is not an IOS command -
and that includes mistyped commands, which happens to all of us sooner or later.
Make sure to run that command in global configuration mode on all your practice
routers.
There are two commands I like to configure on the console line on all my practice
routers and switches. The first is "exec-timeout 0 0", which prevents you from
being kicked out of enable mode and back into user exec after a few minutes of
inactivity. (This doesn´t sound like much, but you´ll get pretty tired of typing
"enable" after a while.) The first zero refers to minutes, the second zero to
seconds. Setting them both to zero disables the exec-timeout function.
The second command prevents the router from interrupting the command you´re typing
with a console message. If you´ve ever been in the middle of typing a router command
and suddenly you´re interrupted with a logging message, you know that can be pretty
annoying. We don´t want the router to not display the message, but we do want
the router to wait until we´re done entering data. The command to perform this
is "logging synchronous".
R1(config)#line console 0
R1(config-line)#exec-timeout 0 0
R1(config-line)#logging synchronous
You won´t see many of these commands on your exams, but after you configure them
on your home lab devices, you´ll wonder how you did without them!
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 daily exam questions, as well as The
Ultimate CCNA and CCNP Study Packages.
For a FREE copy of his latest e-books, "How To Pass The CCNA" or "How To Pass
The CCNP", and for free daily exam question, visit the website
and download your copies! |
