Which two IS-IS hello values must match to form a Level 1 IS-IS adjacency? （）

Given the community: community transit-peers members ^(123|456):[3579].0?$ ; Which threecommunities does this expression match? （）

A. 456:91
B. 123:70
C. 123:440
D. 456:321
E. 123:550

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You want to configure a single EBGP peering session over parallel physical circuits. Which BGPfeature enables load balancing in this scenario?（）

A. multihop BGP
B. multicast BGP
C. route reflection
D. multiprotocol BGP

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