The correct answer is the IP address. In IPv4, the logical address for inter-network routing is the IP address because it contains both a network portion and a host portion, which routers use to forward packets across different networks. Unlike a MAC address, which operates at Layer 2 within a single broadcast domain, the IPv4 logical address is routable at Layer 3, allowing data to traverse multiple networks and arrive at the correct destination host. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of how routers use the network ID portion of an IP address to make forwarding decisions, a common scenario in questions about subnetting or default gateways. A frequent trap is confusing the logical IP address with the physical MAC address—remember that MAC addresses are for local delivery, while IP addresses are for end-to-end routing across networks. A helpful memory tip: “IP for inter-network, MAC for local track.”
N10-009 Networking Concepts Practice Question
This N10-009 practice question tests your understanding of networking concepts. 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.
A network administrator needs to ensure that data sent from a host arrives at the correct destination on a different network. Which of the following provides the logical address used for this purpose in IPv4?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IP address
In IPv4, the logical address used to route data between different networks is the IP address. The IP address contains a network portion that routers use to forward packets across network boundaries, ensuring the data reaches the correct destination network and host.
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.
✗
MAC address
Why it's wrong here
MAC addresses are used for local delivery on the same network segment, not for routing across networks.
✓
IP address
Why this is correct
IP addresses are hierarchical and routable, allowing packets to be forwarded across multiple networks to the destination.
Related concept
Read the scenario before looking for a memorised answer.
✗
Port number
Why it's wrong here
Port numbers identify specific applications or services on a host, not the host itself.
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Default gateway
Why it's wrong here
The default gateway is the router that sends packets to other networks; it is not the destination address.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between Layer 2 (MAC) and Layer 3 (IP) addressing, trapping candidates who confuse local delivery with inter-network routing.
Detailed technical explanation
How to think about this question
IPv4 addresses are 32-bit numbers divided into network and host portions using a subnet mask (e.g., 255.255.255.0). Routers examine the destination IP address and consult their routing table (RIB) to determine the next-hop interface, decrementing the TTL field per RFC 791. In a real-world scenario, a host on 192.168.1.0/24 sending to 10.0.0.5/8 must use the default gateway's IP address to forward the packet, as the destination network differs.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Networking Concepts — This question tests Networking Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: IP address — In IPv4, the logical address used to route data between different networks is the IP address. The IP address contains a network portion that routers use to forward packets across network boundaries, ensuring the data reaches the correct destination network and host.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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