How to find devices on a given network?

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To find the devices on the given network, use nmap

 On RHEL systems, 
$ sudo yum install nmap
On Unix Systems
$ sudo apt-get install nmap

$ nmap -sP IPaddress of your network

 you can find IPaddress of your network by simply running ifconfig command and can find the pattern of IP address of your own netowork

 So, my network has a pattern of 192.168.133....

 $ nmap -sP 192.168.133.0/24
This will show you which hosts responded to ping requests on the network between 192.168.133.0 and 192.168.133.255.

 Then, you can telnet into them for access.
Enjoy Linux..!!!