Which two statements about the OSPF Router ID are true? (Choose two.)
A.
It identifies the source of a Type 1 LSA.
B.
It should be the same on all routers in an OSPF routing instance.
C.
By default, the lowest IP address on the router becomes the OSPF Router ID.
D.
The router automatically chooses the IP address of a loopback as the OSPF Router ID.
E.
It is created using the MAC Address of the loopback interface.
Explanation:
Type 1 – Router LSA – The link-state ID of the type 1 LSA is the originating router ID. The router announces its presence and lists the links to other routers or networks in the same area, together with the metrics to them. Type 1 LSAs are flooded across their own area only.
OSPF router ID take the highest IP address of all loopback interfaces on the router. If there is no loopback inf, take the highest IP address of an operating interface.
0
0