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Question 642 of 2,152
Device Management →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that OSPF will form adjacencies on both interfaces, and PIM sparse-mode will operate normally; the configuration is valid. This works because OSPF and PIM sparse-mode operate at different layers of the routing stack—OSPF handles unicast topology discovery and loop-free path selection, while PIM sparse-mode manages multicast distribution tree construction and relies on the unicast routing table provided by OSPF. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding that enabling both protocols on the same interface is not only allowed but is standard practice for multicast-enabled networks; a common trap is assuming that PIM sparse-mode requires a dedicated multicast routing protocol like DVMRP or that OSPF’s network statement would interfere with PIM’s operation. In reality, OSPF’s network command simply includes the interface in the OSPF process, and PIM sparse-mode independently uses the resulting unicast routes to build its Reverse Path Forwarding (RPF) checks. A helpful memory tip: “OSPF builds the map, PIM follows the path”—they coexist without conflict because one provides the route, the other uses it.

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.

Given the following partial configuration on router R5:

interface GigabitEthernet0/0
 ip address 10.1.1.1 255.255.255.0
 ip pim sparse-mode

!

interface GigabitEthernet0/1
 ip address 10.2.2.1 255.255.255.0
 ip pim sparse-mode

!

router ospf 1

router-id 5.5.5.5

network 10.0.0.0 0.255.255.255 area 0

What is the effect of this configuration?

Question 1mediummultiple choice
Review the full OSPF breakdown →

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, and PIM sparse-mode will operate normally; the configuration is valid.

The configuration enables OSPF on both interfaces via the network statement (since both are in 10.0.0.0/8). It also enables PIM sparse-mode on each interface. This is typical for multicast routing. OSPF will form adjacencies and PIM will operate. There is no conflict.

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 PIM sparse-mode is enabled on the interfaces.

    Why it's wrong here

    OSPF and PIM can coexist on the same interface. PIM does not interfere with OSPF adjacency formation.

  • ✓

    OSPF will form adjacencies on both interfaces, and PIM sparse-mode will operate normally; the configuration is valid.

    Why this is correct

    Both protocols work together. OSPF handles unicast routing, PIM handles multicast. No issues.

    Related concept

    OSPF neighbours must agree on key parameters.

  • ✗

    OSPF will only form adjacency on GigabitEthernet0/0 because the network statement does not match GigabitEthernet0/1.

    Why it's wrong here

    The network statement 10.0.0.0 0.255.255.255 matches both 10.1.1.0/24 and 10.2.2.0/24.

  • ✗

    PIM sparse-mode will not work because there is no rendezvous point (RP) configured.

    Why it's wrong here

    PIM sparse-mode can operate without a statically configured RP if dynamic RP discovery (e.g., Auto-RP or BSR) is used, or if the RP is learned via other means. The absence of an RP does not prevent PIM from operating, but multicast forwarding may be limited.

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, and PIM sparse-mode will operate normally; the configuration is valid. — The configuration enables OSPF on both interfaces via the network statement (since both are in 10.0.0.0/8). It also enables PIM sparse-mode on each interface. This is typical for multicast routing. OSPF will form adjacencies and PIM will operate. There is no conflict.

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

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.

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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Last reviewed: Jun 18, 2026

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