101 · Question #575

101 Question #575: Real Exam Question with Answer & Explanation

The correct answer is A: ARP. ARP and ICMP are network layer protocols in the TCP/IP model, supporting IP address resolution and IP-level error and diagnostic messaging respectively.

Question

What are two examples of network layer protocols? (Choose two)

Options

AARP
BTCP
CIPv4
DBGP
EICMP

Explanation

ARP and ICMP are network layer protocols in the TCP/IP model, supporting IP address resolution and IP-level error and diagnostic messaging respectively.

Common mistakes.

B. TCP (Transmission Control Protocol) operates at Layer 4 of the OSI model, providing reliable connection-oriented data transport, not network layer addressing or delivery functions.
C. While IPv4 defines the network layer packet format and addressing scheme, it represents the overarching internetwork framework rather than a discrete operational protocol example in the way ARP and ICMP are.
D. BGP (Border Gateway Protocol) is an interdomain path-vector routing protocol that runs over TCP port 179 and is classified at the application layer, not the network layer.

Concept tested. OSI and TCP/IP network layer protocol identification

Reference. https://www.ietf.org/rfc/rfc792.txt

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