ICMP and ping/traceroute in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe the purpose of the ping command.

Computer Networks

The ping command uses the [1] protocol to check if a host is reachable.

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ATCP

BICMP

CHTTP

DFTP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing ICMP with TCP or HTTP protocols.

Thinking ping uses protocols related to web or file transfer.

The ping command sends ICMP Echo Request messages and waits for Echo Reply messages to test connectivity.

2fill in blank

medium

Complete the sentence to explain what traceroute shows.

Computer Networks

Traceroute displays the [1] a packet takes to reach its destination.

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Apath

Bsize

Cspeed

Dcontent

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing path with packet size or speed.

Thinking traceroute shows the content of packets.

Traceroute shows the path or route that packets follow through the network to reach a destination.

3fill in blank

hard

Fix the error in the explanation about ICMP message types.

Computer Networks

ICMP Echo Request and Echo Reply messages are used for [1].

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Afile transfer

Bemail delivery

Cnetwork diagnostics

Dweb browsing

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking ICMP messages are used for file transfer or email.

Confusing ICMP with application layer protocols.

ICMP Echo Request and Reply messages are specifically used for network diagnostics like ping.

4fill in blank

hard

Fill both blanks to complete the description of how traceroute works.

Computer Networks

Traceroute sends packets with increasing [1] values and listens for [2] messages from routers.

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ATTL

BACK

CICMP Time Exceeded

DSYN

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing TTL with ACK or SYN flags.

Not knowing which ICMP message indicates TTL expiry.

Traceroute increases the TTL (Time To Live) value in packets to discover each hop. Routers send back ICMP Time Exceeded messages when TTL expires.

5fill in blank

hard

Fill all three blanks to complete the explanation of ping's output.

Computer Networks

Ping reports the [1] of each reply, the number of [2] sent, and the [3] time statistics.

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Apackets

Bround-trip

Ctime

Derrors

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'time' and 'packets' in the output description.

Confusing round-trip time with errors.

Ping shows the time taken for each reply, how many packets were sent, and round-trip time statistics like minimum, maximum, and average.