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300-410 Practice Question: Which TWO statements about OSPFv2 authentication…
Which TWO statements about OSPFv2 authentication troubleshooting are true? (Choose TWO.)
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
✓
The 'show ip ospf interface' command displays the authentication type and key ID configured on an interface.
OSPFv2 supports MD5 and SHA authentication, and the 'show ip ospf interface' command can verify authentication configuration. The 'debug ip ospf adj' command can reveal authentication failures. Plaintext authentication is supported but deprecated, and the 'area authentication' command is used for area-level configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The 'show ip ospf interface' command displays the authentication type and key ID configured on an interface.
Why this is correct
Correct. The output of 'show ip ospf interface' includes fields like 'Auth' and 'Key ID' when authentication is configured.
- ✓
The 'debug ip ospf adj' command can show authentication mismatch errors during neighbor adjacency formation.
Why this is correct
Correct. This debug command logs adjacency events, including authentication failures due to mismatched keys or types.
- ✗
OSPFv2 supports only MD5 authentication; SHA is not supported.
Why it's wrong here
Incorrect. OSPFv2 supports both MD5 and SHA (HMAC-SHA) authentication, depending on the IOS version.
- ✗
Plaintext authentication is the most secure method and is recommended for production networks.
Why it's wrong here
Incorrect. Plaintext authentication sends the password in clear text and is not secure; MD5 or SHA is recommended.
- ✗
The 'ip ospf authentication-key' command is used to configure SHA authentication.
Why it's wrong here
Incorrect. The 'ip ospf authentication-key' command is used for plaintext authentication. For SHA, use 'ip ospf authentication message-digest' and 'ip ospf message-digest-key'.
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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