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Questions and Answers

Which of the following statements about blocking and non-blocking file descriptors are correct?

Newly allocated file descriptors are usually in non-blocking mode.

A non-blocking read system call returns EINTR if it would have to block.

Blocking mode causes read system calls to block if there is no pending data and write system calls to block if there is no capacity to write data. (correct)

In non-blocking mode, system calls will fail instead of blocking the calling process or thread. (correct)

Which of the following statements about connection-less datagram sockets are correct?

Due to the low overhead, most of the Internet communication uses connection-less datagram sockets.

Connection-less datagram sockets requires that applications handle communications errors as part of the application logic. (correct)

Connection-less datagram sockets have very low overhead. (correct)

Applications can use a single datagram socket to communicate with many servers concurrently. (correct)

Which of the following statements about connection-oriented stream sockets are correct?

Stream sockets ensure that data is delivered in the order it was sent; any problems caused by missing or duplicated or out-of-order packets are dealt with by the kernel. (correct)

The kernel passes newly established connections one-by-one to the application by allocating a file descriptor for a new socket representing the connection. (correct)

A server prepares a socket and then asks the kernel to listen for incoming connection requests. (correct)

Applications can use a single stream socket to communicate with many servers concurrently.

Which of the following statements about file descriptors are correct?

By convention, the file descriptor 0 refers to the standard input, the file descriptor 1 refers to the standard output, and the file descriptor 2 refers to the standard error. Signup and view all the answers

Which of the following statements about Internet addresses are correct?

The Internet protocol version 4 (IPv4) uses 32-bit addresses while the Internet protocol version 6 (IPv6) uses 128-bit addresses. Signup and view all the answers

Which of the following statements about multiplexing input/output are correct?

Event driven programs can be very efficient but they are more difficult to understand than regular programs since the program logic is scattered over many callback functions. Signup and view all the answers

Which of the following statements about name resolution are correct?

A computer name can resolve to multiple addresses belonging to the same address family. Signup and view all the answers

Which of the following statements about pipes are correct?

Pipes are unidirectional communication channels over which processes can send a stream of bytes. Signup and view all the answers

Which of the following statements about signals are correct?

Signals can interrupt the execution of blocking system calls. Signup and view all the answers

Which of the following statements about socket addresses are correct?

A struct sockaddr_in adds an IPv4 address member and a port number member to a generic socket address. Signup and view all the answers