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