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300-410 Practice Question: Which THREE commands can be used to verify the…
Which THREE commands can be used to verify the status of a DMVPN Phase 2 spoke-to-spoke tunnel? (Choose THREE.)
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
✓
show dmvpn
To verify a spoke-to-spoke tunnel, 'show dmvpn' displays the tunnel status including peers and up/down state. 'show ip nhrp' shows NHRP cache entries, including the /32 host route for the remote spoke. 'show crypto isakmp sa' shows the IKE phase 1 SA, which must be active for the IPsec tunnel. 'show ip route' shows the routing table but does not specifically show tunnel status. 'show crypto ipsec sa' shows IPsec phase 2 SAs, but the question asks for commands that verify the tunnel, and 'show crypto isakmp sa' is more fundamental for the initial establishment. However, both are valid; we choose three that are most direct. 'show ip route' is not specific enough, and 'show crypto ipsec sa' is also valid but we need exactly three. The correct set is 'show dmvpn', 'show ip nhrp', and 'show crypto isakmp sa'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show dmvpn
Why this is correct
Correct. This command displays DMVPN tunnel status, including the state of spoke-to-spoke tunnels.
- ✓
show ip nhrp
Why this is correct
Correct. This command shows NHRP cache entries, including the /32 host route for the remote spoke that indicates a direct tunnel.
- ✓
show crypto isakmp sa
Why this is correct
Correct. This command shows IKE phase 1 security associations, which must be established for the IPsec tunnel to exist.
- ✗
show ip route
Why it's wrong here
Incorrect. While the routing table may show the /32 route, the command itself does not specifically verify the tunnel status; it only shows routes.
- ✗
show crypto ipsec sa
Why it's wrong here
Incorrect. This command shows IPsec phase 2 SAs, but it is more specific to the IPsec encryption, not the overall DMVPN tunnel. The question asks for commands to verify the tunnel, and 'show dmvpn' and 'show ip nhrp' are more direct.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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