FC0-U71 Infrastructure Practice Question
A technician is troubleshooting a network connectivity issue. The user can access local network resources but cannot browse the internet. The technician suspects a DNS problem. Which of the following is the primary function of DNS?
⚠ Common exam trap
FC0-U71 often tests the confusion between DNS and DHCP, as both are critical network services; candidates may mistakenly select DHCP when asked about name resolution.
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
✓
Translate domain names to IP addresses
DNS (Domain Name System) is essentially the internet's phonebook: it resolves human-readable domain names like www.example.com into the numerical IP addresses (e.g., 192.0.2.1) that computers use to route traffic. Without DNS, users would have to remember IP addresses for every website. In the scenario, the technician suspects DNS because local resources (accessed by IP or local name resolution) work, but internet browsing fails—consistent with a DNS resolution failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Filter unwanted network traffic
Why it's wrong here
Traffic filtering is performed by firewalls, ACLs and security groups inspecting packets; DNS maps hostnames to IP addresses. It tempts candidates because DNS filtering services can block malicious domains, making DNS the correct answer when the requirement is blocking access to specific websites rather than resolving names.
- ✓
Translate domain names to IP addresses
Why this is correct
DNS resolves human-readable domain names into the numerical IP addresses that routers require, so failed resolution prevents internet browsing even when local connectivity works. This directly satisfies the stem's constraint: the user reaches local resources by IP but cannot reach external sites by name, confirming name-to-address translation as DNS's primary function.
- ✗
Provide wireless network access
Why it's wrong here
Wireless access is provided by access points and wireless controllers via SSIDs and radio configuration; DNS performs name-to-IP resolution. It tempts candidates because Wi-Fi connectivity problems also produce "no internet" symptoms, so wireless configuration would be the right focus when clients cannot associate with the WLAN at all.
- ✗
Assign IP addresses to devices on the network
Why it's wrong here
DHCP assigns IP addresses, leases and gateway details; DNS resolves hostnames to IP addresses, which is why local resources work but internet browsing fails. It tempts technicians because both are core network services delivered automatically, and DHCP is the correct answer when hosts lack addresses or cannot reach their gateway.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This FC0-U71 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 FC0-U71 exam.