We could use the netstat tool for displaying various information related to our network.

Sockets:


Sockets are an interface between programs across the network.
The main two types of sockets are TCP and UDP.
  • TCP : provides a system that allows two communicating application to know whether data was sent successfully.
  • UDP : is lighter than TCP because it doesn't provide a verification system for packets like TCP.
Using netstat to display network interfaces:

We display the network interfaces on a system using:



Displaying the routing table:

To display the routing table we use:


Display the process ID:

To display the IDs of the processes that own sockets on a system, we use:


Displaing the listening sockets:

To display the sockets that are listening on a certain port, waiting for incoming connections, we use:


Displaying TCP protocol socket:

To display the TCP protocol sockets, we use:


Displaying TCP protocol socket:

To display the UDP protocol sockets, we use:


Displaying sockets for a certain network interface:

To display the sockets for a specific network interface, we use:



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