At which layer of the OSI reference model does ICMP (Internet Control Message…
2012
At which layer of the OSI reference model does ICMP (Internet Control Message Protocol) operate?
Answer: C. Network layer — ConceptIn layered networking, a protocol is classified by the layer whose functions and packet context it supports. The OSI network layer handles logical…
- A.
Transport layer
- B.
Data link layer
- C.
Network layer
- D.
Application layer
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Show answer & explanation
Correct answer: C
Concept
In layered networking, a protocol is classified by the layer whose functions and packet context it supports.
The OSI network layer handles logical addressing, routing, and delivery of packets across interconnected networks.
Application
ICMP carries control and error-reporting messages for IP, such as Destination Unreachable and Time Exceeded. Because these messages concern IP packet delivery, ICMP operates at the network layer.
Cross-check and contrast
The transport layer provides end-to-end process communication through protocols such as TCP and UDP.
The data link layer handles frame delivery on a single link and link-layer addressing.
The network layer handles IP packet delivery and related control messages.
The application layer hosts protocols that provide services to network applications.
Therefore, ICMP operates at the network layer.