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Question 27 - ICS-SCADA Cyber Security discussion

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When monitoring a network, you receive an ICMP type 8 packet. What does this represent?

A.
Echo request
Answers
A.
Echo request
B.
Echo start
Answers
B.
Echo start
C.
Echo recall
Answers
C.
Echo recall
D.
Echo reply
Answers
D.
Echo reply
Suggested answer: A

Explanation:

ICMP (Internet Control Message Protocol) is used in network devices, like routers, to send error messages and operational information indicating success or failure when communicating with another IP address.

An ICMP type 8 packet specifically is an 'Echo Request.' It is used primarily by the ping command to test the connectivity between two nodes.

When a device sends an ICMP Echo Request, it expects to receive an ICMP Echo Reply (type 0) from the target node. This mechanism helps in diagnosing the state and reachability of a network on the Internet or within a private network.

Reference

RFC 792 Internet Control Message Protocol: https://tools.ietf.org/html/rfc792

Internet Assigned Numbers Authority (IANA) ICMP Parameters:

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asked 18/09/2024
Bruno De Brida
30 questions
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