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單項(xiàng)選擇題

Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause? ()

A. BGP peers must be Layer 2-adjacent
B. EBGP multihop is not configured
C. The firewall is not configured to allow IP protocol 89
D. The firewall is not configured to allow UDP 179.

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