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Question 90

Refer to the graphic, which of the following statements is true about OSPF topology and configuration?

A stable OSPF neighbor relationship can be set up between R1 and R2.

After the default network type of the interface on R1 is restored to broadcast, a stable OSPF neighbor relationship can be set up between R1 and R2.

After the default network type of the interface on R1 is restored to broadcast and the hello packet sending interval is changed to 10s, a stable OSPF neighbor relationship can be set up between R1 and R2.

Compared with R1, R2 is more likely to become the DR because the DR priority of the interface on R2 is lower than that of R1.

Correct Answer: A

In the given configuration, both R1 and R2 have their OSPF network type set to p2p, which is consistent and compatible for establishing an OSPF neighbor relationship. The network type does not need to be changed to broadcast, and no additional adjustments to the hello packet interval are required. Hence, a stable OSPF neighbor relationship can be established as the configuration parameters on R1 and R2 are already matching.

Discussion

abderraoufOption: B

Cmd : ospf network-type { broadcast | nbma | p2mp | p2p [ peer-ip-ignore ] } By default, the network type of an interface depends on the type of the physical interface. The default network type of an Ethernet interface is broadcast.  if the network types de deux peer not identical =>les 2 peer cannot set up the neighbor relationship  if une interface of peer is BRODCAST and l’autre peer is P2P => can still set up the neighbor relationship, but cannot learn the OSPF routing information each other. To enable the interfaces to learn routing information from each other, configure the same interval for sending Hello packets and same neighbor holdtime and the same network-type on the two OSPF interface.  if une interface of peer is P2P and l’autre peer is P2MP => the two OSPF interfaces can establish OSPF neighbor relationship but cannot learn routing information from each other. To enable the interfaces to learn routing information from each other, configure the same interval for sending Hello packets and same neighbor holdtime on the two OSPF interfaces.