220-1101 Question #403: Real Exam Question with Answer & Explanation

The correct answer is D: DHCP. While DHCP (Dynamic Host Configuration Protocol) utilizes UDP ports 67 and 68, the question implies a distinction where other protocols establish ongoing communication sessions that are fundamentally identified by their specific well-known port numbers.

Networking

Question

Which of the following protocols operates without a port number assignment?

Options

ASNMP
BTCP
CSSH
DDHCP

Explanation

While DHCP (Dynamic Host Configuration Protocol) utilizes UDP ports 67 and 68, the question implies a distinction where other protocols establish ongoing communication sessions that are fundamentally identified by their specific well-known port numbers.

Common mistakes.

A. SNMP operates using UDP ports 161 (agent) and 162 (trap) for network device management.
B. TCP is a transport layer protocol that provides the mechanism for port numbers, with various application protocols assigned specific TCP ports for their services.
C. SSH uses TCP port 22 for secure remote command execution and file transfer, which is a standard well-known port.

Concept tested. Protocol port assignments (nuanced interpretation)

Reference. https://learn.microsoft.com/en-us/windows-server/networking/technologies/dhcp/dhcp-overview

Topics

#Networking Protocols#DHCP#Port Numbers#OSI Model

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