Why network scripts automate connectivity tasks in Bash Scripting - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the network is reachable by pinging google.com once.

Bash Scripting

ping -c 1 [1]

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Aexample.com

Blocalhost

C192.168.1.1

Dgoogle.com

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'localhost' will only test your own machine, not the network.

Using an IP like 192.168.1.1 might not be reachable depending on your network.

The command 'ping -c 1 google.com' sends one ping packet to google.com to check connectivity.

2fill in blank

medium

Complete the script to store the IP address of the default gateway in the variable gateway_ip.

Bash Scripting

gateway_ip=$(ip route | grep default | [1] '{print $3}')

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Acut

Bawk

Csed

Dhead

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cut' without specifying delimiter and field might not work as expected.

Using 'sed' is more complex for this simple extraction.

Using awk '{print $3}' extracts the third word from the default route line, which is the gateway IP.

3fill in blank

hard

Fix the error in the script to correctly check if the network interface eth0 is up.

Bash Scripting

if ip link show [1] | grep -q 'state UP'; then
  echo "Interface is up"
else
  echo "Interface is down"
fi

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Aeth1

Blo

Ceth0

Dwlan0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'lo' checks the loopback interface, which is always up.

Using 'wlan0' checks wireless interface, which may not exist.

The script checks the status of interface eth0; using the correct interface name is essential.

4fill in blank

hard

Fill both blanks to create a script that lists all active network interfaces and their IP addresses.

Bash Scripting

ip -o [2] [1] show | awk '{print $2, $4}'

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Aaddr

B-4

C-6

Dlink

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-6' lists IPv6 addresses, not IPv4.

Using 'link' does not show IP addresses.

The command 'ip -o -4 addr show' lists IPv4 addresses of all interfaces in one line per interface.

5fill in blank

hard

Fill all three blanks to create a dictionary-like output of interface names and their IPv4 addresses, excluding interfaces without IP.

Bash Scripting

declare -A ip_map
while read -r [1] [2]; do
  ip_map[[1]]=[2]
done < <(ip -o -4 addr show | awk '{print $2, $4}' | cut -d/ -f1)

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Aiface

Bip_addr

Cip

Dinterface

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable name for both interface and IP causes errors.

Not cutting the IP address to remove subnet mask causes wrong values.

The script reads interface name and IP address into variables iface and ip_addr, then stores ip_addr in ip_map with iface as key.