nslookup and dig for DNS in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to look up the IP address of example.com using nslookup.

Linux CLI

nslookup [1]

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

Aexample.com

Bgoogle.com

Clocalhost

D127.0.0.1

Attempts:

3 left

💡 Hint

Common Mistakes

Using an IP address instead of a domain name.

Typing the command without a domain name.

The command 'nslookup example.com' queries the DNS to find the IP address of example.com.

2fill in blank

medium

Complete the code to query the MX (mail) records of example.com using dig.

Linux CLI

dig [1] example.com

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

AA

BTXT

CNS

DMX

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'A' instead of 'MX' to find mail servers.

Forgetting to specify the record type.

The 'dig MX example.com' command queries the mail exchange servers for example.com.

3fill in blank

hard

Fix the error in the command to perform a reverse DNS lookup for IP 8.8.8.8 using nslookup.

Linux CLI

nslookup [1]

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

Aarpa.in-addr.8.8.8

B8.8.8.8

C8.8.8.8.in-addr.arpa

Din-addr.arpa.8.8.8.8

Attempts:

3 left

💡 Hint

Common Mistakes

Using the .in-addr.arpa format, which requires -type=PTR (e.g., nslookup -type=PTR 8.8.8.8.in-addr.arpa).

Incorrectly ordering the IP parts.

nslookup automatically performs a reverse (PTR) DNS lookup when given an IP address directly, such as 'nslookup 8.8.8.8'.

4fill in blank

hard

Fill both blanks to create a dig command that queries the NS (name server) records for example.com and shows only the answer section.

Linux CLI

dig [1] example.com +[2]

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

ANS

Bshort

Ctrace

Dall

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+all' which shows too much information.

Using the wrong record type like 'A' instead of 'NS'.

The command 'dig NS example.com +short' queries the name servers and shows only the answer section for clarity.

5fill in blank

hard

Fill all three blanks to create a command that uses dig to query the TXT records for example.com, uses +short to simplify output, and directs the output to a file named output.txt.

Linux CLI

dig [1] example.com +[2] > [3]

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

ATXT

Bshort

Coutput.txt

DMX

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong record type like 'MX' instead of 'TXT'.

Forgetting to redirect output to a file.

The command 'dig TXT example.com +short > output.txt' queries TXT records, shows short output, and saves it to output.txt.