Which of the following socket API functions converts an unconnected active TCP socket into a passive socket?
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Answer: C
In TCP socket programming, a newly created socket (via the socket() system call) is an active socket by default, meaning it can be used to initiate an outgoing connection.
To set up a server, this active socket must be converted into a passive socket that listens for incoming connection requests from clients.
listen(): This system call converts an unconnected active socket into a passive socket, instructing the kernel to accept incoming connection requests directed to this socket. It also specifies the backlog queue limit for pending connections.connect(): Used by a client to initiate a connection to a server's passive socket.bind(): Associates a local IP address and port number with the socket.accept(): Blocks the server process until a connection request arrives, returning a new active socket dedicated to that specific client connection.
Therefore, the function that converts an unconnected active TCP socket into a passive socket is listen.
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