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This page has 8 OSPF Troubleshooting Scenarios scenario questions for the 200-901 exam, each with detailed explanations and wrong-answer analysis.

How should I approach 200-901 scenario questions?

Read the full scenario before looking at the answer options. Identify the constraint or requirement in the scenario, then eliminate options that are generally true but wrong for this specific case. Scenario questions reward careful reading over pattern matching.

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Scenario-based practice

OSPF Troubleshooting Scenarios

Practise 200-901 Cisco DevNet Associate 200-901 OSPF questions covering neighbour states, router IDs, areas, timers, passive interfaces, OSPF cost, route selection, and command-output troubleshooting.

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scenario questions

200-901

exam code

Cisco

vendor

Scenario guide

How to approach ospf troubleshooting scenarios

OSPF neighbour adjacencies, route advertisements, and DR/BDR elections appear consistently on the CCNA. These questions test whether you can read OSPF state from show commands and identify why two routers fail to reach FULL adjacency or why a route isn't being learned.

Quick answer

OSPF questions usually test neighbour formation, areas, router IDs, route preference, metrics and command-output interpretation.

How OSPF neighbours form and why adjacency can fail.

How router ID, area ID, timers, passive interfaces and authentication affect OSPF.

How OSPF cost influences route selection.

How to read show ip route and show ip ospf neighbor output.

Practice scenarios

Question 1hardmultiple choice

Review the full OSPF breakdown →

Based on the routing table, what type of OSPF route is the default route (0.0.0.0/0)?

Exhibit

Refer to the exhibit.
```
R1# show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.0.0.1 to network 0.0.0.0

O*E2 0.0.0.0/0 [110/1] via 10.0.0.1, 00:00:34, GigabitEthernet0/0
O    10.0.0.0/8 [110/2] via 10.0.0.1, 00:00:34, GigabitEthernet0/0
O    172.16.0.0/16 [110/3] via 192.168.1.1, 00:00:34, GigabitEthernet0/1
C    192.168.1.0/24 is directly connected, GigabitEthernet0/1
```

A
OSPF inter-area route
Why wrong: Inter-area routes show as O IA.
B
OSPF NSSA external type 1 route
Why wrong: NSSA routes display as N1 or N2.
C
OSPF intra-area route
Why wrong: Intra-area routes show as O without asterisk.
D
OSPF external type 2 route
O*E2 indicates external type 2 default.

Full breakdown with real-world context →

Question 2hardmulti select

Review the full OSPF breakdown →

Which THREE factors influence the convergence time of OSPF in a large enterprise network? (Choose three.)

A
CPU processing power for SPF calculations
SPF computation time affects convergence.
B
Hello and dead interval timers
Shorter timers speed failure detection.
C
Bidirectional Forwarding Detection (BFD) implementation
Why wrong: BFD is not part of OSPF itself.
D
DUAL algorithm processing time
Why wrong: DUAL is used by EIGRP, not OSPF.
E
LSA propagation delay across the network
Flooding LSAs takes time.

Full breakdown with real-world context →

Question 3mediumdrag order

Review the full OSPF breakdown →

Drag and drop the steps to configure OSPF on a Cisco router into the correct order.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

1Step 1

2Step 2

3Step 3

4Step 4

5Step 5

Question 4hardmultiple choice

Review the full OSPF breakdown →

Refer to the exhibit. A DevOps engineer is using NETCONF to retrieve the OSPF configuration. The <get> response is missing the network statements. What is the most likely cause?

Exhibit

Router# show running-config | section router ospf
router ospf 1
 network 10.1.1.0 0.0.0.255 area 0
 network 192.168.1.0 0.0.0.255 area 1

A
The filter used in the NETCONF request did not include the correct path for network commands.
If the filter subtree does not include the network list, the response will not contain those statements.
B
The YANG model for OSPF does not include the network statement.
Why wrong: The YANG model for OSPF does include network statements.
C
The device does not support NETCONF for OSPF.
Why wrong: IOS-XE supports NETCONF for OSPF.
D
The NETCONF username does not have sufficient privileges.
Why wrong: Insufficient privileges would typically cause an access-denied error, not missing data.

Full breakdown with real-world context →

Question 5mediummulti select

Review the full OSPF breakdown →

Which THREE are characteristics of OSPF? (Choose three.)

A
It is a distance-vector routing protocol
Why wrong: OSPF is link-state.
B
It uses cost as the metric
Cost is derived from bandwidth.
C
It uses hop count as the metric
Why wrong: OSPF uses cost based on bandwidth.
D
It is a link-state routing protocol
OSPF is link-state.
E
It supports Variable-Length Subnet Mask (VLSM)
OSPF includes subnet mask in LSAs.

Full breakdown with real-world context →

Question 6hardmultiple choice

Review the full OSPF breakdown →

You are a network engineer at a financial services company. The network uses OSPF as the IGP, and all routers are in area 0. The core network consists of four routers (R1, R2, R3, R4) connected in a full mesh with GigabitEthernet links. The OSPF cost is set to 1 on all interfaces. Recently, a new application was deployed that requires low jitter and deterministic paths between two servers: Server A connected to R1 and Server B connected to R4. During peak hours, you notice that traffic between the servers is using the path R1->R3->R4 instead of R1->R2->R4, causing higher latency due to congestion on R3. OSPF metrics reflect equal cost to both paths (cost 2 each). You need to enforce that traffic from Server A to Server B always uses the path through R2 without changing the topology or adding additional hardware. Which action should you take?

A
Change the routing protocol from OSPF to EIGRP to have better metric control.
Why wrong: EIGRP also uses composite metrics; OSPF can already differentiate paths with cost.
B
Use the 'default-information originate' command on R2 to attract traffic.
Why wrong: This advertises a default route, not influencing specific prefixes.
C
Configure policy-based routing (PBR) on R1 to send traffic destined to Server B's subnet to the next-hop R2.
Why wrong: PBR is application-specific and may not be deterministic; also it can cause asymmetric routing issues.
D
Increase the OSPF cost on the interface between R1 and R3 to a value higher than the cost of the path through R2.
Increasing cost on R1-R3 makes the R1-R2-R4 path lower total cost (2 vs 1+10=11).

Full breakdown with real-world context →

Question 7mediummultiple choice

Review the full OSPF breakdown →

A network administrator is configuring OSPF on a router and wants to ensure that routes from area 0 are propagated to area 1, but area 1 should not see specific inter-area routes. Which OSPF feature should be used?

A
NSSA
Why wrong: Allows external routes, not suitable for hiding inter-area routes.
B
Totally stubby area
Why wrong: Blocks all type 3 LSAs, not just specific inter-area routes.
C
Virtual-link
Why wrong: Used to connect to backbone, not for filtering.
D
Stub area
Blocks type 5 LSAs, provides a default route.

Full breakdown with real-world context →

Question 8mediummultiple choice

Review the full OSPF breakdown →

An engineer is writing a Python script using the Cisco DevNet sandbox to configure OSPF on a CSR1000v via RESTCONF. What authentication method is typically used for RESTCONF requests?

A
No authentication
Why wrong: Production devices always require authentication.
B
OAuth2
Why wrong: OAuth2 is not typical for device-level RESTCONF.
C
API token only
Why wrong: API tokens are common for cloud APIs, but not standard for device RESTCONF.
D
Basic authentication over HTTPS
Basic auth over HTTPS is widely used for RESTCONF on Cisco devices.

Full breakdown with real-world context →

These 200-901 practice questions are part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style 200-901 questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.

OSPF Troubleshooting Scenarios

How to approach ospf troubleshooting scenarios

Quick answer

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200-901 troubleshooting practice questions

Practice scenarios

Based on the routing table, what type of OSPF route is the default route (0.0.0.0/0)?

Exhibit

Which THREE factors influence the convergence time of OSPF in a large enterprise network? (Choose three.)

Drag and drop the steps to configure OSPF on a Cisco router into the correct order.

Refer to the exhibit. A DevOps engineer is using NETCONF to retrieve the OSPF configuration. The <get> response is missing the network statements. What is the most likely cause?

Exhibit

Which THREE are characteristics of OSPF? (Choose three.)

A network administrator is configuring OSPF on a router and wants to ensure that routes from area 0 are propagated to area 1, but area 1 should not see specific inter-area routes. Which OSPF feature should be used?

An engineer is writing a Python script using the Cisco DevNet sandbox to configure OSPF on a CSR1000v via RESTCONF. What authentication method is typically used for RESTCONF requests?