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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Application Layer
Exercise:
Review
Question:26 | ISBN:9780132856201 | Edition: 6

Question

In Section 2.7, the UDP server described needed only one socket, whereas the TCP server needed two sockets. Why? If the TCP server were to support n simultaneous connections, each from a different client host, how many sockets would the TCP server need?

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Answer

With the UDP server, there is no welcoming socket, and all data from different clients enters the server through this one socket. With the TCP server, there is a welcoming socket, and each time a client initiates a connection to the server, a new socket is created. Thus, to support n simultaneous connections, the server would need n+1 sockets.

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