题目内容

Each socket has a number (address) consisting of the IP address of the host and a 32-bit number local to that host, called port.

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TCP service is obtained by having both the sender and receiver create end points, called sockets.

Host A sends a TCP segment (Seq = 43, ACK = 103), to which host B replies with a TCP segment (Seq = 103, ACK = 57). The payload of the first TCP segment is

A. 57 bytes long
B. 46 bytes long
C. 43 bytes long
D. 14 bytes long

Many client-server applications (e.g. DNS) that have one request and one response use UDP.

UDP transmits segments consisting of an 8-byte header followed by the payload.