Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A router has two routes to the same destination network: one learned via OSPF with a metric of 10, and another learned via EIGRP with a composite metric of 3072. The default administrative distances are OSPF=110, EIGRP=90. Which route will be installed in the routing table?
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
Distractor review
The OSPF route because it has a lower metric
Metrics are only comparable within the same routing protocol. Administrative distance is used to compare routes from different protocols, not metric. OSPF's higher AD makes it less preferred.
B
Best answer
The EIGRP route because it has a lower administrative distance
EIGRP's default administrative distance of 90 is lower than OSPF's 110, so the router chooses the EIGRP route regardless of metric values.
C
Distractor review
Both routes will be installed for load balancing
For equal-cost multipath, routes must have the same metric and be from the same routing protocol (or have equal AD from different protocols, which is rare). Here, the ADs differ, so only one route is installed.
D
Distractor review
The OSPF route because it is a link-state protocol
The routing protocol type does not affect which route is installed; the decision is based on administrative distance. OSPF is link-state but still has AD 110.
Common exam trap
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Technical deep dive
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
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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 network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?
Question 2
A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?
Question 3
A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?
Question 4
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Question 5
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Question 6
A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?
FAQ
Questions learners often ask
What does this N10-009 question test?
OSPF neighbours must agree on key parameters.
What is the correct answer to this question?
The correct answer is: The EIGRP route because it has a lower administrative distance — When multiple routing protocols provide routes to the same destination, the router uses administrative distance (AD) to choose the route. The lower AD is preferred. EIGRP has AD 90, OSPF has AD 110, so the EIGRP route is installed regardless of metric. Metric only matters within the same routing protocol.
What should I do if I get this N10-009 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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