409Q和415自己修正版答案也有不同，这题到底该选哪个？！

retest

You work as a network engineer for the company, you want to configure two BGP speakers to form an EBGP session across a firewall. On the engineer's network,
the firewall always permits TCP sessions that are initiated from the inside network (the network attached to the inside interface of the firewall). What prerequisite is
there for enabling BGP to run on this network?
A. EBGP multihop will need to be configured for this to work.
& X$ @( Y" r0 j: xB. This should work with normal BGP peering, with no additional configuration on the BGP speakers or the firewall.
9 m; E* H* E  M" {; e% r+ B% p$ wC. The BGP protocol port must be opened on the firewall
D. There is no way to make BGP work across a firewall.
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4 k4 h) }; b; X4 ^" |3 y. C" w6 ^3 y
. b8 ?- [4 z8 {9 L4 {+ p$ Z0 s. ?. k# R409,415,415修正，448，429。很多答案不一致的题，怎么办？？都说以415为主，可是近期409貌似比415更准确一点。。。

5ibob

huangtidi

眞的/mg爱妳

以415自己修改版为准。    415自己修改版到目前位置还没发现有错误的答案
, y7 c/ P+ c; p! a) R这题楼主自己复习一下防火墙和BGP的知识点（这题在415自己修改版里有解释）。

razgriz

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409里是选c的

winddew

选A，在两端都指了neighbor的情况下，虽然从外部发起的TCP连接无法通过，但是从内发起的TCP连接是可以建立的，题目背景描述中特地提到了这个，所以只要解决了多跳的问题就可以了。