The correct answer is that the default route is used only when no more-specific route matches, so packets destined for 192.168.50.25 will be forwarded using the /24 entry. This is because routers always apply the longest prefix match rule when making forwarding decisions, meaning the route with the most specific subnet mask—in this case, the /24—takes priority over the less specific default route. On the CCNA 200-301 v2 exam, this concept tests your understanding of how the routing table processes overlapping entries, often appearing in scenario-based questions where a default route is present alongside a more precise network statement. A common trap is assuming the default route acts as a catch-all that overrides specifics, but the router always prefers the longer mask. Remember the memory tip: “Longer is stronger”—the more bits in the prefix, the more specific the match, and the higher the priority.
CCNA IP Routing Practice Question
This 200-301 practice question tests your understanding of ip routing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address.. 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.
Exhibit
S* 0.0.0.0/0 via 203.0.113.1
O 192.168.50.0/24 [110/20] via 10.10.10.2
A route table shows both a default route and a more specific route to 192.168.50.0/24. Which two statements describe how packets destined for 192.168.50.25 are handled?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router prefers the 192.168.50.0/24 route because it is the longest prefix match
Once routes are installed, packet forwarding follows longest prefix match. The /24 route is more specific than the default route, so traffic to 192.168.50.25 uses the /24 entry.
Key principle: Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The router prefers the 192.168.50.0/24 route because it is the longest prefix match
Why this is correct
Longest prefix match decides forwarding when multiple routes match a destination.
Related concept
Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address.
✓
The default route is used only when no more-specific route matches
Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address.
✗
Administrative distance is compared before prefix length for forwarding decisions
Why it's wrong here
Forwarding first relies on the most specific matching prefix present in the table.
✗
The packet is load-balanced across both routes automatically
Why it's wrong here
A default and a more-specific route are not treated as equal-cost forwarding entries.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is assuming that administrative distance is compared before prefix length when selecting a route. Candidates might think that if the default route has a better administrative distance, it will be chosen over a more specific route. However, Cisco routers always apply the longest prefix match rule first, selecting the most specific route regardless of administrative distance. Administrative distance only comes into play when multiple routes have the same prefix length. Misunderstanding this can lead to incorrect answers about how packets are forwarded, especially when both default and specific routes exist in the routing table.
Detailed technical explanation
How to think about this question
Routing tables in Cisco devices use the longest prefix match rule to determine the best path for forwarding packets. When multiple routes match a destination IP address, the router selects the route with the most specific subnet mask, meaning the route with the longest prefix length. For example, a route to 192.168.50.0/24 is more specific than a default route 0.0.0.0/0 because /24 covers a smaller, more precise range of IP addresses.
The forwarding decision process first identifies all routes that match the destination IP address. Among these, the route with the longest prefix is preferred regardless of administrative distance or metric at this stage. Only if multiple routes have the same prefix length does the router compare administrative distance and metrics to select the best path. Therefore, packets destined for 192.168.50.25 will use the 192.168.50.0/24 route instead of the default route because it is a more specific match.
A common exam trap is misunderstanding the role of administrative distance and prefix length in route selection. Many candidates incorrectly believe administrative distance is always compared first, but Cisco routers prioritize longest prefix match before considering administrative distance. Practically, this means a more specific route always overrides a default route, preventing packets from being sent to a less optimal path. This behavior ensures efficient routing and prevents unnecessary use of fallback routes when a precise match exists.
KKey Concepts to Remember
Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address.
A route with a more specific subnet mask (longer prefix) is preferred over a less specific route such as a default route.
The default route (0.0.0.0/0) is only used when no other more specific route matches the destination IP address.
Administrative distance is compared only when multiple routes have the same prefix length to determine the best path.
Routing tables do not load-balance traffic between a default route and a more specific route because they are not equal-cost routes.
Longest prefix match ensures packets are forwarded along the most precise path available in the routing table.
Misunderstanding the order of route selection criteria can lead to incorrect assumptions about packet forwarding behavior.
Cisco routing behavior prioritizes prefix length over administrative distance to optimize routing efficiency and accuracy.
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
Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address..
What is the correct answer to this question?
The correct answer is: The router prefers the 192.168.50.0/24 route because it is the longest prefix match — Once routes are installed, packet forwarding follows longest prefix match. The /24 route is more specific than the default route, so traffic to 192.168.50.25 uses the /24 entry.
What should I do if I get this 200-301 question wrong?
Review cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Cisco routers use longest prefix match to select the best route when multiple routes match a destination IP address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.