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.
正确答案:B
答案解析:有
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