| Exam 400-101 | Question id=1139 | Layer 3 Technologies |
You issue the show ip ospf interface fastethernet 0/1 command on RouterE and receive the following output:
RouterE#show ip ospf interface FastEthernet 0/1
FastEthernet0/1 is up, line protocol is up
Internet Address 10.2.16.43/24, Area 0
Process ID 1, Router ID 10.0.0.4, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DROTHER, Priority 50
Designated Router (ID) 10.0.0.7, Interface address 10.2.16.17
Backup Designated router (ID) 10.0.0.11, Interface address 10.2.16.17
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:04
Neighbor Count is 5, Adjacent neighbor count is 2
Adjacent with neighbor 10.0.0.7 (Designated Router)
Adjacent with neighbor 10.0.0.11 (Backup Designated Router)
Suppress hello for 0 neighbor(s)
Which of the following statements is correct?
| A. |
RouterE is connected to a point-to-multipoint network. | |
| B. |
RouterE is the DR for the segment. | |
| C. |
The BDR has a priority higher than 50. | |
| D. |
RouterE is configured with incorrect timer settings. | |
| E. |
RouterE can establish adjacencies with only two routers on this interface. |
RouterE can establish adjacencies with only two routers on this interface. The output of the show ip ospf interface fastethernet 0/1 command shows that RouterE is in the DROTHER state. A router in the DROTHER state can only establish adjacencies with the designated router (DR) and the backup designated router (BDR). Therefore, RouterE is neither the DR nor the BDR. The DR has a router ID of 10.0.0.7 and an IP address of 10.2.16.1, and the BDR has a router ID of 10.0.0.11 and an IP address of 10.2.16.17.
RouterE is not connected to a point-to-multipoint network, because the network segment contains a DR and a BDR. A DR and a BDR are not elected on point-to-multipoint or point-to-point networks; they are elected only on multi-access networks.
The BDR might or might not have a priority higher than 50. If RouterE were started before the DR and BDR were elected, RouterE would not be eligible to become the DR or the BDR, regardless of the priority value of RouterE, until the existing DR and BDR failed or were powered off. If RouterE were started at the same time as the existing DR and BDR, the BD would have a priority of at least 50 because RouterE has a priority of 50. If the BDR and RouterE have the same priority, the BDR will be elected before RouterE because it has a higher router ID than RouterE. RouterE is not configured with incorrect timer settings. The hello timers and dead timers between two routers must match for the routers to establish a neighbor adjacency. Therefore, if RouterE were configured with incorrect timer settings, RouterE would not be able to establish adjacencies with the DR and the BDR. By default, the hello timer is set to 10 seconds and the dead timer is set to 40 seconds on point-to-point and broadcast links.