Which IP multicast address is used by OSPF to communicate with all OSPF speaking routers?
A) 224.0.0.10
B) 224.0.0.2
C) 224.0.0.6
D) 224.0.0.5
D
Explanation: D) OSPF uses two different IPv4 multicast addresses: 224.0.0.5 and 224.0.0.6. The 224.0.0.5 address is used to speak to all OSPF speaking routers; the 224.0.0.6 address is used for communications between DR/BDR OSPF routers when needed.
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