netstat and ss (connection listing) in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to list all active TCP connections using netstat.

Linux CLI

netstat [1] tcp

Drag options to blanks, or click blank then click option'

A-r

B-a

C-s

D-n

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-r' which shows routing tables instead of connections.

Using '-s' which shows statistics, not connections.

The '-a' option shows all active connections and listening ports.

2fill in blank

medium

Complete the command to display listening sockets only using ss.

Linux CLI

ss [1]

Drag options to blanks, or click blank then click option'

A-l

B-u

C-t

D-a

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-a' which shows all sockets, not just listening ones.

Using '-t' which filters TCP sockets only.

The '-l' option shows only listening sockets.

3fill in blank

hard

Fix the error in the command to show numeric addresses with netstat.

Linux CLI

netstat [1]

Drag options to blanks, or click blank then click option'

A-a

B-p

C-n

D-r

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-a' which shows all connections but not numeric addresses.

Using '-p' which shows process info but not numeric addresses.

The '-n' option forces numeric output of addresses and ports.

4fill in blank

hard

Fill both blanks to list all UDP connections with ss and show process info.

Linux CLI

ss [1] [2] udp

Drag options to blanks, or click blank then click option'

A-a

B-p

C-u

D-l

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-l' which shows only listening sockets, missing active connections.

Using '-u' which is redundant since 'udp' is already specified.

Use '-a' to show all sockets and '-p' to show process info.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps ports to states for TCP connections using ss.

Linux CLI

connections = [1]: [2] for [3] in ss_output if 'tcp' in [3]

Drag options to blanks, or click blank then click option'

Aconn['port']

Bconn['state']

Cconn

Dconn['proto']

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'conn['proto']' as key or value instead of port or state.

Using wrong loop variable or missing it.

We map port to state for each connection in ss_output where protocol is TCP.