单选题Two BGP peers connected through a routed firewall are unable to establish a peering relationship. What could be the most likely cause？（）ABGP peers must be Layer 2-adjacent.BEBGP multihop is not configured.CThe firewall is not configured to allow IP protocol 89.DThe firewall is not configured to allow UDP 179.
单选题
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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