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CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. 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 options correctly describe how a router processes a packet destined for a remote network? (Choose three.)
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
✓
It decrements the Time-to-Live (TTL) field in the IP header.
When a router forwards a packet to a remote network, it first decrements the Time-to-Live (TTL) field in the IP header to prevent infinite loops. It then performs a routing table lookup for the destination IP address to determine the next-hop interface and IP. Finally, it rewrites the source and destination MAC addresses for the next hop, because MAC addresses are only relevant on the local link and must be updated at each Layer 3 hop.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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) header changes, so the trap here is that candidates mistakenly think the source IP address is rewritten at each hop, confusing routing with NAT or PAT.
Detailed technical explanation
How to think about this question
The TTL field is decremented by exactly 1 at each router; if it reaches 0, the router discards the packet and sends an ICMP Time Exceeded message back to the source (per RFC 791). The routing table lookup uses the longest prefix match algorithm to find the most specific route. MAC address rewriting uses ARP to resolve the next-hop IP to its MAC address, and the source MAC is set to the router's outgoing interface MAC.
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
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It decrements the Time-to-Live (TTL) field in the IP header. — When a router forwards a packet to a remote network, it first decrements the Time-to-Live (TTL) field in the IP header to prevent infinite loops. It then performs a routing table lookup for the destination IP address to determine the next-hop interface and IP. Finally, it rewrites the source and destination MAC addresses for the next hop, because MAC addresses are only relevant on the local link and must be updated at each Layer 3 hop.
What should I do if I get this 200-301 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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Last reviewed: Jun 11, 2026
This 200-301 practice question is part of Courseiva's free Cisco 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 200-301 exam.
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