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[其他] 关于400-251的另一道问题

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楼主
发表于 7 天前 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
171) When TCP intercept is enabled in its default mode, how does it react to a SYN request?" I6 a/ X) B9 a
A. It intercepts the SYN before it reaches the server and responds with a SYN-ACK B. It drops the connection
/ B- E+ m8 J/ d6 rC. It monitors the attempted connection and drops it if it fails to establish within 30 seconds2 S: F' S0 W5 S5 J
D. It allows the connection without inspection
( y& G/ c2 r( DE. It monitors the sequence of SYN, SYN-ACK, and ACK messages until the connection is fully established6 H7 S" M, w3 m/ |3 q1 Q9 R6 O
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有道题选B,还有一道一模一样的题,选E,到底哪个对的??
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沙发
发表于 7 天前 | 只看该作者
A. E is for monitor mode
板凳
 楼主| 发表于 6 天前 | 只看该作者
到底哪个对 的??
地板
发表于 6 天前 | 只看该作者
本帖最后由 einsteank 于 2018-1-16 10:45 编辑
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The TCP Intercept feature can operate in either active intercept mode or passive watch mode. " W# G5 _0 _1 m7 r
The default is intercept mode.  In intercept mode, the software actively intercepts each incoming connection request (SYN) and responds on behalf of the server with a SYN-ACK, then waits for an acknowledge (ACK) from the client. When the ACK is received, the original SYN is sent to the server and the software performs a three-way handshake with the server. When the three-way handshake is complete, the two half connections are joined.+ o% \0 |2 G, n) Y# o. \5 X
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Anser is "A" ~~
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5#
发表于 6 天前 | 只看该作者
本帖最后由 einsteank 于 2018-1-16 10:46 编辑
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1 q! q  j) q3 x) DThe TCP Intercept feature can operate in either active intercept mode or passive watch mode. The default is intercept mode.
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In intercept mode, the software actively intercepts each incoming connection request (SYN) and responds on behalf of the server with a SYN-ACK, then waits for an acknowledge (ACK) from the client. When the ACK is received, the original SYN is sent to the server and the software performs a three-way handshake with the server. When the three-way handshake is complete, the two half connections are joined.
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