mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Control Plane Policing (CoPP) issue:
R1# show ip ospf interface detail
FastEthernet0/0 is up, line protocol is up Internet Address 10.1.1.1/24, Area 0.0.0.0, Attached via Network Statement Process ID 1, Router ID 10.1.1.1, Network Type BROADCAST, Cost: 1 Topology-MTID Cost Disabled Shutdown Topology Name 0 1 no no Base Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 10.1.1.1, Interface address 10.1.1.1 Backup Designated router (ID) 10.1.1.2, Interface address 10.1.1.2 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:03 Supports Link-local Signaling (LLS) Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 25 Last flood scan time is 0 msec, maximum is 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.1.1.2 (Backup Designated Router) Suppress hello for 0 neighbor(s)
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that any CoPP configuration automatically disrupts OSPF, but the trap here is that the 'show ip ospf interface detail' output explicitly shows a working adjacency, proving CoPP is not the issue.
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 is operating normally with one neighbor, suggesting CoPP is not impacting OSPF.
The output shows that OSPF has formed a full adjacency with neighbor 10.1.1.2, which is the Backup Designated Router. The neighbor count is 1 and the adjacent neighbor count is 1, indicating that OSPF is operating normally on this interface. Therefore, CoPP is not impacting OSPF Hello or adjacency formation.
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 is not forming adjacencies due to CoPP dropping Hello packets.
Why it's wrong here
The output shows one adjacent neighbor, so adjacencies are formed.
- ✓
OSPF is operating normally with one neighbor, suggesting CoPP is not impacting OSPF.
Why this is correct
The interface is up, timers are normal, and an adjacency exists.
- ✗
OSPF is experiencing DR/BDR election issues due to CoPP.
Why it's wrong here
The router is DR, and the neighbor is BDR, indicating a successful election.
- ✗
OSPF is not receiving Hello packets due to CoPP.
Why it's wrong here
The neighbor count of 1 indicates Hello packets are being received.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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