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Question

Difficulty: EasyNetworking Ports and Protocols

A network technician is setting up a local server intended to automatically assign dynamic IP addresses and default gateways to workstations on the subnetwork. Which port and transport layer protocol combination must be allowed on the server to support this service?

  1. UDP port 67Answer
  2. B
    UDP port 53
  3. C
    TCP port 67
  4. D
    TCP port 80

Answer

UDP port 67 is the correct choice because Dynamic Host Configuration Protocol (DHCP) servers receive incoming client configuration requests on UDP port 67.
Dynamic Host Configuration Protocol (DHCP) server software listens on User Datagram Protocol (UDP) port 67 to receive discovery and request messages from network hosts requiring automatic IP configuration.

Step-by-Step Solution

1
Identify the required network service based on the scenario description.
The server automatically assigns IP addresses and network configuration parameters, which defines the function of Dynamic Host Configuration Protocol (DHCP).
Recognizing the functional definition identifies the protocol being queried.
2
Determine the transport protocol and port number assigned to the DHCP server role.
DHCP operates over UDP, using port 67 on the server side and port 68 on the client side.
Broadcast-based IP address distribution requires connectionless datagram traffic before an endpoint has configured its IP stack.

Key Concept

Dynamic Host Configuration Protocol (DHCP) Port Assignment
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Topics

Networking Ports and Protocols

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