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A. ip ospf authentication message-digest
B. network 192.168.10.0 0.0.0.255 area 0
C. area 20 authentication message-digest
D. ip ospf message-digest-key 1 md5 CCNA
Answer:C
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A. ip ospf authentication message-digest B. network 192.168.10.0 0.0.0.255 area 0 C. area 20 authentication message-digest D. ip ospf message-digest-key 1 md5 CCNA