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Question

Difficulty: EasyNetworking Ports and Protocols

A network technician is configuring an access control list on a switch to allow client workstations to automatically obtain IP address assignments from a server on the network. Which port and protocol combination must be opened to allow communication to the assignment server?

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

Answer

UDP port 67 must be opened to allow client workstations to communicate with the DHCP server for dynamic IP address assignment.
Dynamic Host Configuration Protocol (DHCP) servers accept client discovery and request messages on UDP port 67. Opening UDP port 67 permits workstations to communicate with the DHCP server to receive IP address configurations automatically.

Step-by-Step Solution

1
Identify the required network service based on the scenario description.
The requirement is automatic IP address assignment, which is performed by the Dynamic Host Configuration Protocol (DHCP).
DHCP is responsible for leasing IP addresses and network settings to client devices.
2
Determine the transport protocol and port number used by DHCP servers.
DHCP server operation relies on UDP port 67 (clients send requests to server port 67, and listen on UDP port 68).
DHCP uses connectionless UDP broadcasts to discover and communicate with configuration servers on the local subnet.

Key Concept

DHCP Port and Protocol Configuration
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Topics

Networking Ports and Protocols

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