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

Addressing:
Routers
Hostnames Phiber Optik
S0 161.20.4.1/30 (DCE) n/a
S1 n/a 161.20.4.2/30 (DTE)
L0 161.20.3.1/30 161.20.5.1/30
E0 161.20.2.1/24 161.20.1.1/24
Workstations A B
IP 161.20.2.2 161.20.1.2
SM 255.255.255.0 255.255.255.0
GW 161.20.2.1 161.20.1.1
Step-by-Step Instructions:
1. Cable and set up the lab as shown. Test for connectivity from workstation A to its
gateway and workstation B to its gateway. Test ping from workstation A to
workstation B. This should NOT work. Test ping from workstation A to Loopback
0. Test ping from workstation B to Loopback 0. These should work (virtual ports).
Test ping from workstation B to its gateway and to workstation A. This one also
should NOT work because of route summarization with RIP version 1. In
short…route summarization “chopped” the network off at 161.20.0.0/16 and did not
advertise the /24 routes. Follow the logic flow charts at the end of the lab.
2. Let’s look a little deeper at what is happening. Since this is a routing issue lets issue
the sh ip route command on Phiber. You should see that the loopback is directly
connected on Phiber:
phiber#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR
Gateway of last resort is not set
161.20.0.0/16 is variably subnetted, 4 subnets, 2 masks
R 161.20.5.0/30 [120/1] via 161.20.4.2, 00:00:02, Serial0/0
C 161.20.4.0/30 is directly connected, Serial0/0
C 161.20.3.0/30 is directly connected, Loopback0
C 161.20.2.0/24 is directly connected, Ethernet0/0
phiber#
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