Question 396 of 2,152

Device Management →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that OSPF will form adjacencies on both interfaces as intended, and the configuration is redundant but fully functional. This happens because OSPF can be enabled on an interface either through the `ip ospf` interface command or through a matching `network` statement under the router process; when both methods are used for the same interface, the result is simply duplicate activation with no conflict or error. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of OSPF configuration precedence and redundancy, often appearing as a trick question where candidates mistakenly think the `network` statement overrides or conflicts with the interface-level command. The common trap is assuming that overlapping commands cause a failure, but Cisco IOS gracefully handles the overlap by treating it as harmless duplication. A useful memory tip is "interface first, network second—both work, no wreck."

300-410 Device Management Practice Question

This 300-410 practice question tests your understanding of device management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.

Consider the following partial configuration on router R2:

interface GigabitEthernet0/0
 ip address 10.0.0.2 255.255.255.0
 ip ospf 1 area 0

interface GigabitEthernet0/1
 ip address 192.168.1.2 255.255.255.0
 ip ospf 1 area 0

router ospf 1

router-id 2.2.2.2

network 10.0.0.0 0.0.0.255 area 0
 network 192.168.1.0 0.0.0.255 area 0

What is the effect of this configuration?

Question 1mediummultiple choice

Review the full OSPF breakdown →

A
OSPF will not form adjacencies because the interface and network commands conflict, causing OSPF to ignore the network statements.
Why wrong: There is no conflict; both methods can be used together. OSPF will use the interface configuration and the network statement will also apply, but no conflict arises.
B
OSPF will form adjacencies on both interfaces, but the router-id 2.2.2.2 will be overridden by the highest loopback IP.
Why wrong: The router-id is explicitly set to 2.2.2.2 and will not be overridden by any interface IP unless the router-id is removed or reset.
C
OSPF will form adjacencies on both interfaces as intended; the configuration is redundant but functional.
Both interfaces have OSPF enabled via the interface command and the network statement. This is acceptable and OSPF will operate normally.
D
OSPF will only form adjacency on GigabitEthernet0/1 because the network statement for 10.0.0.0 is incorrect.
Why wrong: The network 10.0.0.0 0.0.0.255 area 0 correctly matches the 10.0.0.0/24 subnet on GigabitEthernet0/0.

Full breakdown with real-world context →

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

✓

OSPF will form adjacencies on both interfaces as intended; the configuration is redundant but functional.

The configuration has OSPF enabled on interfaces both via the ip ospf interface command and via network statements under the router. This is redundant but valid; the network statement will enable OSPF on any interface matching the network, but the interface already has OSPF enabled. The network statement will also enable OSPF on additional interfaces that match, but here both interfaces are already covered. The configuration works as intended.

Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
OSPF will not form adjacencies because the interface and network commands conflict, causing OSPF to ignore the network statements.
Why it's wrong here
There is no conflict; both methods can be used together. OSPF will use the interface configuration and the network statement will also apply, but no conflict arises.
✗
OSPF will form adjacencies on both interfaces, but the router-id 2.2.2.2 will be overridden by the highest loopback IP.
Why it's wrong here
The router-id is explicitly set to 2.2.2.2 and will not be overridden by any interface IP unless the router-id is removed or reset.
✓
OSPF will form adjacencies on both interfaces as intended; the configuration is redundant but functional.
Why this is correct
Both interfaces have OSPF enabled via the interface command and the network statement. This is acceptable and OSPF will operate normally.
Related concept
OSPF neighbours must agree on key parameters.
✗
OSPF will only form adjacency on GigabitEthernet0/1 because the network statement for 10.0.0.0 is incorrect.
Why it's wrong here
The network 10.0.0.0 0.0.0.255 area 0 correctly matches the 10.0.0.0/24 subnet on GigabitEthernet0/0.

Common exam traps

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.

Detailed technical explanation

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.

Key takeaway

OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

Real-world example

How this comes up in practice

A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.

What to study next

Got this wrong? Here's your next step.

Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.

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FAQ

Questions learners often ask

What does this 300-410 question test?

Device Management — This question tests Device Management — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: OSPF will form adjacencies on both interfaces as intended; the configuration is redundant but functional. — The configuration has OSPF enabled on interfaces both via the ip ospf interface command and via network statements under the router. This is redundant but valid; the network statement will enable OSPF on any interface matching the network, but the interface already has OSPF enabled. The network statement will also enable OSPF on additional interfaces that match, but here both interfaces are already covered. The configuration works as intended.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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