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Perform the following experiment on a Linux system: Explore and select three networking Linux commands of your choice, try them, and explain their usage.

Question

Perform the following experiment on a Linux system: Explore and select three networking Linux commands of your choice, try them, and explain their usage.

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Solution

Sure, here are three networking Linux commands that you can try:

  1. ping: This command is used to test the network connection between your system and the server. It sends ICMP Echo Request packets to the network host and gives the response time. Here's how you can use it:

    • Open your terminal.
    • Type ping www.google.com and press Enter. You should see a continuous stream of lines that look something like this: 64 bytes from www.google.com (172.217.5.228): icmp_seq=1 ttl=53 time=22.4 ms.
    • To stop the command, press Ctrl + C.
  2. netstat: This command displays various network related information such as network connections, routing tables, interface statistics, masquerade connections, multicast memberships etc. Here's how you can use it:

    • Open your terminal.
    • Type netstat and press Enter. You'll see a list of active connections.
    • To see the routing table, type netstat -r and press Enter.
  3. ifconfig: This command is used to display or configure a network interface. Here's how you can use it:

    • Open your terminal.
    • Type ifconfig and press Enter. You'll see information about all network interfaces currently in operation.
    • To see information about a specific interface, type ifconfig [interface]. For example, ifconfig eth0.

Remember, you need to have the necessary permissions to execute these commands. If you're not the root user, you might need to use sudo before these commands.

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Lab. Understanding Network Configuration on CentOS To help you... Lab. Understanding Network Configuration on CentOSTo help you avoid accidentally breaking networking on your system, this lab focuses on viewing network information and not making permanent changes to network configuration.STEP 1. Open a terminal window on your CentOS system.                                       STEP 2. Use the ifconfig command to display the current network configuration.                                       STEP 3. Use the nmcli command to determine whether the Network Manager is currently active.                                       STEP 4. Use the arp command to display the ARP table.                                       STEP 5. Use the route command to display the routing table.                                       STEP 6. Use the route command to add a new route for the 192.168.145.0/24 network, with gateway 192.168.0.199.                                       STEP 7. Use the route command to display the new routing table                                       STEP 8. Display the current system name.                                       STEP 9. Change the current system name to mymachine.                                       STEP 10. Use the host command to perform a DNS query on ubuntu.com.                                       STEP 11. Use the dig command to perform a DNS query on ubuntu.com. <                                  STEP 12. Use the netstat command to display TCP information.                                       STEP 13. Use the netstat command to display the routing table.                                                                              STEP 14. Use the cat command to display the contents of the file that contains the system's hostname.                                       STEP 15. Use the cat command to display the contents of the file that contains the hostname-to-IP-address translation.                                       STEP 16. Use the cat command to display the contents of the file that contains the DNS servers for this system.                                       STEP 17. Use the cat command to display the contents of the file that contains the setting that determines if networking should be turned on by default for this system.                                       STEP 18. Use the cat command to display the contents of the file that contains the settings for the eth0 device (or emp0s3 if you are working on a virtual machine).

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