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Which of the following system calls results in the sending of SYN packets?

  1. socket

  2. bind

  3. listen

  4. connect

asked in Computer Networks by Veteran (59.9k points) | 3k views
+1
+1
0

Very nicely explained here!

https://notes.shichao.io/unp/ch4/

2 Answers

+48 votes
Best answer

Answer is (D).

socket()   creates a new socket of a certain socket type, identified by an integer number, and allocates system resources to it.
bind()  is typically used on the server side, and associates a socket with a socket address structure, i.e. a specified local port number and IP address.
listen() is used on the server side, and causes a bound TCP socket to enter listening state.
connect() is used on the client side, and assigns a free local port number to a socket. In case of a TCP socket, it causes an attempt to establish a new TCP connection.

When connect() is called by client, following three way handshake happens to establish the connection in TCP.
1) The client requests a connection by sending a SYN (synchronize) message to the server.
2) The server acknowledges this request by sending SYN-ACK back to the client.
3) The client responds with an ACK, and the connection is established.

answered by Boss (16.8k points)
edited by
+8

The typical set of system calls on both the machines in a connection-oriented setup is shown in given flowchart.

  • accept() is used on the server side. It accepts a received incoming attempt to create a new TCP connection from the remote client, and creates a new socket associated with the socket address pair of this connection.
  • write() and read(), are used for sending and receiving data to/from a remote socket.
  • close() causes the system to release resources allocated to a socket. In case of TCP, the connection is terminated..
  • source:https://www.cse.iitk.ac.in/users/dheeraj/cs425/lec18.html
–7 votes
ans b)
answered by Loyal (5.3k points)
+1
It is connect !
Answer:

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