Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
Exhibit
R1# show ip route O 10.60.4.0/24 [110/20] via 192.0.2.2 S 10.60.4.16/28 [1/0] via 192.0.2.6 D 10.60.0.0/16 [90/30720] via 192.0.2.10 Destination being tested: 10.60.4.17
Based on the exhibit, which route will be used for destination 10.60.4.17?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
The static route to 10.60.4.16/28
This is correct because the destination falls inside the more specific /28 prefix.
B
Distractor review
The OSPF route to 10.60.4.0/24
This is wrong because the /24 is less specific than the /28.
C
Distractor review
The EIGRP route to 10.60.0.0/16
This is wrong because the /16 is broader than both other matches.
D
Distractor review
No route at all
This is wrong because the destination clearly matches all three shown prefixes.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is to choose a route based on administrative distance or routing protocol preference rather than the longest prefix match. Here, although OSPF and EIGRP routes exist, the static route with the /28 prefix is more specific and will be preferred. Misunderstanding prefix specificity versus routing protocol hierarchy can lead to incorrect answers.
Technical deep dive
How to think about this question
Routing decisions in Cisco devices prioritize the longest prefix match when multiple routes to the same destination exist. This means the route with the most specific subnet mask (largest subnet mask length) is chosen first. In this scenario, the destination IP 10.60.4.17 falls within the 10.60.4.16/28 subnet, which covers IP addresses from 10.60.4.16 to 10.60.4.31. Although there are other routes like 10.60.4.0/24 (OSPF) and 10.60.0.0/16 (EIGRP), these have shorter prefix lengths (/24 and /16 respectively), making them less specific. The static route with the /28 mask is therefore the best match and will be installed in the routing table as the active route. This behavior is fundamental to IP routing and ensures traffic is forwarded along the most precise path available. Administrative distance and routing protocol metrics only come into play when prefix lengths are equal.
KKey Concepts to Remember
- Longest prefix match in routing
- Static route specificity versus dynamic routing protocols
- Subnet mask length impact on route selection
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
Longest prefix match in routing
What is the correct answer to this question?
The correct answer is: The static route to 10.60.4.16/28 — The route used will be the route with the longest matching prefix. In practical terms, 10.60.4.17 falls inside the /28 route shown, and that is more specific than the broader /24 and /16 alternatives. Because specificity comes first, the /28 route wins. This is a clean route-table interpretation problem that mirrors actual exam-style thinking very closely.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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