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Question

Difficulty: MediumNetworking Ports and Protocols

An IT specialist is configuring an internal network host to automatically assign IPv4 network configuration parameters—including IP addresses, subnet masks, and default gateways—to client computers on a local subnet. Which of the following port and transport protocol combinations must be permitted on the server to receive incoming request broadcasts from client workstations?

  1. UDP port 67Answer
  2. B
    UDP port 53
  3. C
    UDP port 68
  4. D
    TCP port 53

Answer

UDP port 67 is required on the server to receive incoming DHCP requests.
Dynamic Host Configuration Protocol (DHCP) operates using UDP port 67 on the server side to receive incoming client broadcasts for IP address assignment. Clients listen for responses on UDP port 68.

Step-by-Step Solution

1
Identify the required network service based on the scenario description.
The service that dynamically assigns IP addresses, subnet masks, and default gateways to workstations is the Dynamic Host Configuration Protocol (DHCP).
DHCP automates network configuration parameters for client endpoints.
2
Determine the transport protocol and listening port used by the server side of this service.
DHCP server listens on UDP port 67 for DISCOVER and REQUEST messages broadcast by clients.
DHCP relies on Connectionless User Datagram Protocol (UDP) broadcasting during initial client lease negotiation.

Key Concept

DHCP Port and Transport Layer Protocol Operations
Estimated Time:1m 0s
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Topics

Networking Ports and Protocols

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