Refer to the exhibit. Assume that all of the router interfaces are operational and configured correctly. How will router R2 be affected by the configuration of R1 that is shown in the exhibit?
A.
Router R2 will not form a neighbor relationship with R1.
B.
Router R2 will obtain a full routing table, including a default route, from R1.
C.
R2 will obtain OSPF updates from R1, but will not obtain a default route from R1.
D.
R2 will not have a route for the directly connected serial network, but all other directly connected networks will be present, as well as the two Ethernet networks connected to R1.
Suggested Answer:A🗳️
"ip route 0.0.0.0 0.0.0.0 serial0/0" is causing a loop. configuration is going to cause a loop and the link between R1 and R2 will be congested, OSPF will not perform relationship between them. From its name, OSPF is a Link-State routing protocol, and the link state between R1 and R2 is simply down or something like that.
Correct. The answer is B. I tested on real equipment as packet tracer can differ sometimes and I found that if you traceroute to an address not on any of those interfaces, you get a routing loop:
Router#traceroute 8.8.8.8
Type escape sequence to abort.
Tracing the route to 8.8.8.8
1 172.16.100.1 0 msec 0 msec 0 msec
2 172.16.100.2 4 msec 0 msec 0 msec
3 172.16.100.1 4 msec 0 msec 0 msec
4 172.16.100.2 4 msec 0 msec 4 msec
5 172.16.100.1 4 msec 0 msec 4 msec
<snip>
30 172.16.100.2 4 msec 4 msec 8 msec
On Packet Tracer, the output for R1 is:
R1#show ip route
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
172.16.0.0/16 is variably subnetted, 8 subnets, 5 masks
O 172.16.0.0/20 [110/65] via 172.16.100.2, 00:00:55, Serial0/0/0
O 172.16.16.0/20 [110/65] via 172.16.100.2, 00:00:45, Serial0/0/0
C 172.16.100.0/30 is directly connected, Serial0/0/0
L 172.16.100.1/32 is directly connected, Serial0/0/0
C 172.16.100.64/26 is directly connected, GigabitEthernet0/0
L 172.16.100.65/32 is directly connected, GigabitEthernet0/0
C 172.16.100.128/27 is directly connected, GigabitEthernet0/1
L 172.16.100.129/32 is directly connected, GigabitEthernet0/1
S* 0.0.0.0/0 is directly connected, Serial0/0/0
On Packet Tracer, the output is:
R2# show ip route
Gateway of last resort is 172.16.100.1 to network 0.0.0.0
172.16.0.0/16 is variably subnetted, 8 subnets, 5 masks
C 172.16.0.0/20 is directly connected, GigabitEthernet0/0
L 172.16.0.1/32 is directly connected, GigabitEthernet0/0
C 172.16.16.0/20 is directly connected, GigabitEthernet0/1
L 172.16.16.1/32 is directly connected, GigabitEthernet0/1
C 172.16.100.0/30 is directly connected, Serial0/0/0
L 172.16.100.2/32 is directly connected, Serial0/0/0
O 172.16.100.64/26 [110/65] via 172.16.100.1, 00:00:28, Serial0/0/0
O 172.16.100.128/27 [110/65] via 172.16.100.1, 00:00:18, Serial0/0/0
O*E2 0.0.0.0/0 [110/1] via 172.16.100.1, 00:36:58, Serial0/0/0
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