关于400-251的另一道问题

170417111

171) When TCP intercept is enabled in its default mode, how does it react to a SYN request?
A. It intercepts the SYN before it reaches the server and responds with a SYN-ACK B. It drops the connection
C. It monitors the attempted connection and drops it if it fails to establish within 30 seconds
D. It allows the connection without inspection
' M* p% B/ `, Y* @. d  t3 U( gE. It monitors the sequence of SYN, SYN-ACK, and ACK messages until the connection is fully established

4 O: z2 b/ W: ~6 |有道题选B，还有一道一模一样的题，选E，到底哪个对的？？

ricecs

A. E is for monitor mode

170417111

到底哪个对 的？？

einsteank

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/ N3 W3 n/ M0 X+ s/ b. @The TCP Intercept feature can operate in either active intercept mode or passive watch mode.
4 `! b! j0 b+ B2 o, UThe 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.
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  k* h. v7 ?8 \" xAnser is "A" ~~
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einsteank

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The 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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