Linux Networking 2

Question 1

Which command displays the routing table on a Linux system?

Accepted Answer

netstat -r

Answer

The `netstat -r` command (or `ip route show`) displays the kernel IP routing table.

Question 2

What does the `ss` command replace in modern Linux distributions?

Accepted Answer

netstat

Answer

`ss` (socket statistics) is the modern replacement for `netstat` and provides faster, more detailed socket information.

Question 3

Which file on a Linux system maps hostnames to IP addresses locally before DNS is queried?

Accepted Answer

/etc/hosts

Answer

The `/etc/hosts` file provides static hostname-to-IP mappings that are checked before DNS resolution.

Question 4

What is the purpose of the `/etc/resolv.conf` file?

Accepted Answer

Specifies DNS server addresses for name resolution

Answer

`/etc/resolv.conf` configures the DNS resolver by specifying nameserver addresses and search domains.

Question 5

Which port does SSH use by default?

Accepted Answer

22

Answer

SSH (Secure Shell) listens on TCP port 22 by default for encrypted remote connections.

Linux Practice Test