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

in DE pkts 0 out DE pkts 0
out bcast pkts 18 out bcast bytes 1152
pvc create time 00:23:24, last time pvc status changed 00:16:49
DLCI = 18, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE,
INTERFACE = Serial0/0
input pkts 54 output pkts 53 in bytes 4472
out bytes 4364 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
out bcast pkts 21 out bcast bytes 1344
pvc create time 00:23:18, last time pvc status changed 00:19:50
Notice you are on “diekman” which uses dlci #16 to connect to the Adtran. When
you do a sh frame pvc you see the status of dcli #17 and #18…the other two
dlci’s.
Challenge Lab or Supplemental Activities:
1. Why did we use “point-to-point?” Our other option when configuring our subinterface
was “multi-point.” Find out when we use each.
2. Put an error on the serial interface on one of the routers (shut down the interface,
remove the lmi type, etc). See if you can still get connectivity between all three
routers.
So what have I learned here?
So far we have learned that frame relay is just another encapsulation that we can use on a
serial interface (which is HDLC by default). You have also learned how to set up a “hub
and spoke” frame relay network which only has partial meshed connectivity. We did that
to save money. In this lab you learned how to configure a fully meshed frame relay
network. You learned that you need multiple ip addresses on your physical serial
interface (which you cannot do) so you used logical sub-interfaces to set up your circuits.
My, my, my so much to do! Next we will start expanding upon your knowledge of hub
and spoke networks and fully-meshed networks by adding in some networking “twists.”
Guest Router Name Derivation
Jason Allen Diekman, a.k.a. “Shadow Knight” or “Dark Lord,” was charged with hacking
into Nasa, Oregon State Univeristy, and a San Francisco area ISP in 2002. He was
sentenced to 21 months in Federal Prison, ordered to pay restitution of $87,736.29, and
will have 3 years of probation, which includes no computer accessing. Apparently he
used stolen credit card numbers to transfer money through Western Union and to try
buying equipment from NASA’s Jet Propulsion Laboratory. While free on bail from
charges the “defendant” (use whatever word you want there) hacked into several other
university computer systems. Boy this one is a case study in stupidity 101. Even
“geniuses” do not always have “common sense.” Won’t shower time be fun for him too?
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