Deploying OSPF on a Broadcast Medium
Question
You are asked to deploy OSPF between two routers over a broadcast medium.
Which three fields in the OSPF hello packet must match? (Choose three.)
Answers
Explanations
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A. B. C. D. E.ABD
When deploying OSPF between two routers over a broadcast medium, there are three fields in the OSPF hello packet that must match. These three fields are:
Hello interval: The hello interval is the amount of time between hello packets sent by the OSPF routers on the network. It is an essential field to match between the two routers. If the hello intervals don't match, then the OSPF routers won't be able to communicate with each other, which can lead to routing issues.
Options: The options field in the hello packet contains various flags that specify the OSPF router's capabilities and settings. This field must match between the two routers for them to communicate with each other successfully.
Designated Router (DR) and Backup Designated Router (BDR): In OSPF, the designated router and backup designated router are responsible for managing network changes and distributing routing information to other routers on the network. The DR and BDR fields in the hello packet must match between the two routers to ensure that they are both participating in the OSPF network and working together to manage network changes.
The other two options in the answer choices, network mask and backup designated router, are not required to match between the two routers in order for OSPF to function over a broadcast medium. However, it is important to ensure that the network mask is configured correctly on both routers to ensure that OSPF is advertising the correct network information to other routers.
