NTC/362: Fundamentals of Networking
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NTC/362: Fundamentals of Networking
Q: In the internetwork shown in the exhibit, R1 is the central site router, and R2 is a typical remote office router. The network manager dictates that the remote routers should all use a default route to forward packets back to the central site, while the central site router should use a static route to forward packets to each remote office's LAN subnet. As soon as the network manager has correctly implemented this design, you connect to R1 and R2 using Telnet and issue the show ip route command on each router. Which of the following answers list output you should see in the routers?
A: On R2: S* 0.0.0.0/0 [1/0] via S0/0/0 , On R1: S 172.17.6.64 [1/0] via 172.16.1.2
Explanation: On R1: as a central site router, R1 needs a route for R2's specific LAN subnet of 172.17.6.64/26, which can be derived from the information in the exhibit. Of the two answers for router R1, only one lists 172.17.6.64, with a correct next hop of R2's serial IP address 172.16.1.2.
On R2: the default route is needed on R2, a branch office router, so the show ip route command should list a destination/mask of 0.0.0.0/0. Of the two incorrect answers for router R2, one answer refers to 172.16.1.2 (R2's IP address) as a next-hop address, but it should refer to R1's IP address. The other incorrect answer lists a route to subnet 10.55.44.0, which is not a default route, but the question stated that the remote router must use a default route. So, the option that lists 0.0.0.0/0 as the destination, with an outgoing interface (on R2) of S0/0/0, is the expected route on R2.
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