Which of the following protocols is not implemented at the Internet layer of the TCP/IP protocol model?

The correct answer is A. User datagram protocol (UDP). UDP operates at the Host-to-Host Transport layer, not the Internet layer. The Internet layer contains protocols focused on addressing and routing: IP handles logical addressing and packet forwarding, ICMP handles error reporting and diagnostics (e.g., ping), and IGMP manages…

Submitted by ahmad_uae· Apr 18, 2026Network and Communications Security

Question

Exhibit

Options

AUser datagram protocol (UDP)
BInternet protocol (IP)
CInternet Group Management Protocol (IGMP)
DInternet control message protocol (ICMP)

How the community answered

(57 responses)

A
91% (52)
B
2% (1)
C
2% (1)
D
5% (3)

Explanation

UDP operates at the Host-to-Host Transport layer, not the Internet layer. The Internet layer contains protocols focused on addressing and routing: IP handles logical addressing and packet forwarding, ICMP handles error reporting and diagnostics (e.g., ping), and IGMP manages multicast group memberships. UDP and TCP both reside one layer up, at the Transport layer, where they handle host-to-host communication.

Topics

#TCP/IP model#Internet layer#Networking protocols#UDP

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