A loopback interface never comes down even if the link is broken so it provides stability for the OSPF process (for example we use that loopback interface as the router-id) - B is correct.
The router-ID is chosen in the order below:
The highest IP address assigned to a loopback (logical) interface. If a loopback interface is not defined, the highest IP address of all active router's physical interfaces will be chosen. -The loopback interface will be chosen as the router ID of RouterB - C is correct.
I am not sure either, but if I had to guess it it because the router will have a stable router ID instead of having to pick from the highest configured interface ip address.
The loopback interface will provide stability for the OSPF process because the loopback interface is a virtual interface inside of the router, meaning that it is not dependent upon a physical interface being up/up. As long as the router is connected to power and OSPF is enabled, the OSPF process on the router will be active.
The issue of DR does not apply remember that by default ospf priority is 0.
hence no need to talk about Election process.
The best answers are router id and stability.
@Zerotime0 , it is the router-ID for router B only. Router-ID must be unique in every router. If the router-ID is not defined on the ospf configuration then it will choose the highest loopback address on that router, if no loopback address was configured then it will choose the highest IP address of the active interface on that router.
here in the diagram only one loopback is specified so we need to assumes that only one loopback is configured on the router hence it will be used as the router id.
OSPF uses the following criteria to select the router ID:
1. Manual configuration of the router ID (via the "router-id x.x.x.x" command under OSPF router configuration mode).
2. Highest IP address on a loopback interface.
3. Highest IP address on a non-loopback and active (no shutdown) interface.
With OSPF, the loopback interface is useful because it is an interface with an IP address which never goes down (stability)
Answer = BC
I was researching on this and it states, as long you have more than 2 routers(considers as Multi Access Network) will allows that area 0(for this ex.) to elect a DR and BDR no?
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