GATE CS 2017 Set 2 — Question 18

MCQ+1 / -0.33HardSocket ProgrammingTransport LayerComputer Networks

Computer Networks → Transport Layer → Socket Programming

Last updated 5 September 2026

Question

Consider socket API on a Linux machine that supports connected UDP sockets. A connected UDP socket is a UDP socket on which connect function has already been called. Which of the following statements is/are CORRECT? I. A connected UDP socket can be used to communicate with multiple peers simultaneously. II. A process can successfully call connect function again for an already connected UDP socket.

Correct answer (B) II only Solution Statement I is INCORRECT . When connect() is called on a UDP socket, the socket is restricted to sending and receiving datagrams only to/from the specific peer address specified in the connect() call. It cannot communicate with multiple peers simultaneously using that single connected state. Statement II is CORRECT . A process can call connect() again on an already connected UDP socket to either change the peer address or to dissolve the connection (by setting the address family to AF_UNSPEC). This is a standard feature of the BSD socket API used in Linux. Therefore, only statement II is correct, making (B) the right choice. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) II only Solution Statement I is INCORRECT . When connect() is called on a UDP socket, the socket is restricted to sending and receiving datagrams only to/from the specific peer address specified in the connect() call. It cannot communicate with multiple peers simultaneously using that single connected state. Statement II is CORRECT . A process can call connect() again on an already connected UDP socket to either change the peer address or to dissolve the connection (by setting the address family to AF_UNSPEC). This is a standard feature of the BSD socket API used in Linux. Therefore, only statement II is correct, making (B) the right choice.

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