The correct answer is that a router’s primary functions include IP forwarding, NAT, and DHCP. IP forwarding is the core Layer 3 operation where the router examines the destination IP address in each packet, consults its routing table, and forwards the packet toward the correct network—this is what distinguishes a router from a Layer 2 switch. NAT (Network Address Translation) allows the router to map private IP addresses to a public one, enabling multiple devices to share a single internet connection, while DHCP services let the router automatically assign IP addresses to devices on the local network. On the CompTIA ITF+ FC0-U61 exam, this concept tests your understanding of the router’s role at the Network Layer, and a common trap is confusing a router’s DHCP function with a dedicated DHCP server—remember, a router can perform DHCP but its primary job is still forwarding traffic. A helpful memory tip: think of the router as a “traffic cop” that directs packets (IP forwarding), translates addresses (NAT), and hands out parking permits (DHCP).
FC0-U61 Infrastructure Practice Question
This FC0-U61 practice question tests your understanding of infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE of the following are primary functions of a network router?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Forwarding packets based on IP addresses
B is correct because a router's primary function is to forward packets between different networks by examining the destination IP address in the packet header and consulting its routing table to determine the best path. This Layer 3 (Network Layer) operation is fundamental to routing, distinguishing it from switches that operate at Layer 2.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Providing wireless access to clients
Why it's wrong here
Wireless access is provided by an access point, not a router's primary function.
✓
Forwarding packets based on IP addresses
Why this is correct
Routers make forwarding decisions based on destination IP.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Connecting devices within the same local network
Why it's wrong here
This is a switch function; routers connect different networks.
✓
Performing Network Address Translation (NAT)
Why this is correct
Routers commonly translate private IPs to public for internet access.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Assigning IP addresses via DHCP
Why this is correct
Many routers include a DHCP server for automatic IP assignment.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between a router's core function (IP forwarding) and its optional features (like NAT, DHCP, or wireless), leading candidates to incorrectly include or exclude options based on common all-in-one device assumptions.
Detailed technical explanation
How to think about this question
Routers maintain routing tables that can be populated statically or dynamically via protocols like OSPF (RFC 2328) or BGP (RFC 4271). When a packet arrives, the router performs a longest-prefix match on the destination IP to determine the next hop; if no match is found, the packet is dropped (or sent to a default route). In real-world scenarios, routers also handle fragmentation and reassembly when MTU mismatches occur between networks.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure — This question tests Infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Forwarding packets based on IP addresses — B is correct because a router's primary function is to forward packets between different networks by examining the destination IP address in the packet header and consulting its routing table to determine the best path. This Layer 3 (Network Layer) operation is fundamental to routing, distinguishing it from switches that operate at Layer 2.
What should I do if I get this FC0-U61 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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