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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# debug ip ospf adj
OSPF adjacency debugging is on R1#
*Mar 1 00:05:23.123: OSPF: Rcv pkt from 10.1.1.2, FastEthernet0/0, area 0.0.0.0, packet type: 1 (Hello) *Mar 1 00:05:23.123: OSPF: 2 Way Communication to 10.1.1.2 on FastEthernet0/0, state 2WAY *Mar 1 00:05:23.124: OSPF: Send immediate hello to nbr 10.1.1.2, src address 10.1.1.1, on FastEthernet0/0 *Mar 1 00:05:23.124: OSPF: Rcv pkt from 10.1.1.2, FastEthernet0/0, area 0.0.0.0, packet type: 2 (DBD) *Mar 1 00:05:23.125: OSPF: Rcv DBD from 10.1.1.2, seq 0x1234, opts 0x2, flag 0x7, mtu 1500 state EXSTART *Mar 1 00:05:23.126: OSPF: Nbr 10.1.1.2 has state FULL
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that any debug output showing OSPF packet reception implies a problem, when in fact the sequence of states (2WAY to FULL) indicates successful adjacency formation, and candidates may incorrectly attribute normal behavior to CoPP failure.
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 adjacency is established successfully, indicating CoPP is not blocking OSPF traffic.
The debug output shows the OSPF adjacency progressing through the expected states (2WAY, EXSTART) and reaching FULL after receiving a Database Description (DBD) packet. This confirms that OSPF Hello and DBD packets are being processed normally, which means Control Plane Policing (CoPP) is not dropping OSPF traffic. CoPP would typically drop packets at the control plane, preventing state transitions like 2WAY or FULL.
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 adjacency is failing due to CoPP dropping Hello packets.
Why it's wrong here
The output shows successful Hello exchange and transition to FULL state.
- ✓
OSPF adjacency is established successfully, indicating CoPP is not blocking OSPF traffic.
Why this is correct
The adjacency reached FULL state, meaning OSPF packets are being processed correctly.
- ✗
OSPF is experiencing packet loss due to MTU mismatch.
Why it's wrong here
The MTU of 1500 is mentioned, but no errors are indicated.
- ✗
OSPF is stuck in EXSTART state due to CoPP.
Why it's wrong here
The output shows transition from EXSTART to FULL.
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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