Why network tools diagnose connectivity in Linux CLI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a host is reachable using ping.

Linux CLI

ping -c 4 [1]

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

A-t

B-v

Clocalhost

Dgoogle.com

Attempts:

3 left

💡 Hint

Common Mistakes

Using options like -v or -t instead of a hostname.

Leaving the host blank.

The ping command followed by a hostname or IP address checks connectivity by sending packets. Here, google.com is a common host to test.

2fill in blank

medium

Complete the command to display the current network interfaces and their IP addresses.

Linux CLI

ip [1]

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

Aaddr

Broute

Clink

Dconfig

Attempts:

3 left

💡 Hint

Common Mistakes

Using ip route which shows routing tables.

Using ip link which shows interfaces but not IP addresses.

The ip addr command shows network interfaces and their IP addresses, helping diagnose connectivity issues.

3fill in blank

hard

Fix the error in the command to trace the route packets take to reach a host.

Linux CLI

traceroute [1]

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

A-n

Bgoogle.com

C-c 4

Dlocalhost

Attempts:

3 left

💡 Hint

Common Mistakes

Using options like -n or -c without specifying a host.

Leaving the host blank.

The traceroute command requires a hostname or IP address to trace the path packets take. Here, google.com is the target host.

4fill in blank

hard

Fill both blanks to create a command that shows active network connections and listening ports.

Linux CLI

netstat [1] [2]

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A-t

B-u

C-l

D-a

Attempts:

3 left

💡 Hint

Common Mistakes

Using only -t or -u which show TCP or UDP but not all connections.

Mixing options that don't show listening ports.

The netstat -a -l command lists all active connections and listening ports, useful for diagnosing network issues.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps interface names to their IP addresses if the IP is IPv4.

Linux CLI

interfaces = { [1]: [2] for [3], [2] in ip_addr.items() if '.' in [2] }

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

Aiface

Bip

Dip_addr

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable name for key and value.

Not filtering for IPv4 addresses.

This dictionary comprehension loops over ip_addr.items(), assigning interface names to iface and IPs to ip. It keeps only IPv4 addresses containing a dot.