Learning by Doing: CISCO Certified Network ... - SCN Research

01:02:29: ICMP: time exceeded (time to live) sent to 192.168.3.2 (dest
was 192.168.4.2)
01:02:29: ICMP: dst (192.168.3.1) port unreachable sent to 192.168.3.2
01:02:31: ICMP: dst (192.168.3.1) port unreachable sent to 192.168.3.2
01:02:32: ICMP: dst (192.168.3.1) port unreachable sent to 192.168.3.2
Randy#
So this is confusing…our times are exceeded, our ports are unreachable, but our
icmp’s still worked. Something for you to think about.
14. Let’s see the RIP updates (sent every 30 seconds by default) as they pass through
our routers (more on updates and timers in another lab).
Randy#debug ip rip
You should see:
Randy#debug ip rip
RIP protocol debugging is on
Randy#
01:05:48: network 192.168.30.0, metric 1
01:05:48: network 192.168.4.0, metric 2
01:05:48: network 192.168.3.0, metric 1
Randy#
15. We can use hostnames on our routers to make ping-ing a bit easier. Instead of
using those long 32-bit IP addresses we can assign names to them. The order of
input is important because the router will look at the first ip address, then the next,
and so on, depending upon how many ip addresses you associate with a host
name. Generally it is a good idea to put them in the order they are most likely to
be used. I tend to put serial lines in front of Ethernet lines.
Randy(config)#ip host ward 192.168.30.2 192.168.4.1
OR
Randy(config)#ip host wards0 192.168.30.2
Randy(config)#ip host warde0 192.168.4.1
Ward(config)#ip host randy 192.168.30.1 192.168.3.1
OR
Ward(config)#ip host randys1 192.168.30.1
Ward(config)#ip host randye0 192.168.3.1
16. What does the “description” command do when you are configuring an interface?
Randy(config)#int e0/0
Randy(config-if)#description DCE serial to Ward DTE
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