What are two differences between OSPF and IS-IS? (Choose two.)
A . OSPF is a link-state routing protocol, and IS-IS is a distance-vector routing protocol.
B . OSPF uses a router ID to identify a router, and IS-IS uses a system ID.
C . OSPF elects a DR and a BDR, and IS-IS elects a DIS.
D . Unlike OSPF. IS-IS supports virtual links.
E . Unlike IS-IS routers, an OSPF router belongs to only one area in addition to the backbone area.
Answer: B, C
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