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220-1201 Practice Question: A technician is troubleshooting a DHCP issue…
A technician is troubleshooting a DHCP issue where clients are not receiving IP addresses. Which port must be open on the firewall for DHCP server communication?
⚠ Common exam trap
A common misconception is that port 68 (the client port) is the server port, or that DHCP uses TCP instead of UDP, leading candidates to confuse the listening and response ports.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
67
DHCP servers listen on UDP port 67 for incoming client requests (DHCPDISCOVER, DHCPREQUEST). For the server to receive these messages, the firewall must allow inbound traffic to port 67. Without this port open, the server cannot process client requests, and no IP addresses are assigned.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
67
Why this is correct
Port 67 is the DHCP server port, used to receive client requests and send offers.
- ✗
68
Why it's wrong here
Port 68 is the DHCP client port, used by clients to send requests, but the question asks for server communication.
- ✗
53
Why it's wrong here
Port 53 is DNS, not DHCP.
- ✗
123
Why it's wrong here
Port 123 is NTP, used for time synchronization, not DHCP.
Visual reference
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Related to this question
Learn chapter
Network Configuration: IP, DNS, DHCP
Key term
DHCP
Dynamic Host Configuration Protocol (DHCP) automatically assigns IP addresses and network settings to devices on a network, so they can communicate without manual configuration.
Key term
DHCP server
A DHCP server is a network device or service that automatically assigns IP addresses and other network configuration parameters to devices on a network, eliminating the need for manual configuration.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.