hardMultiple ChoiceObjective-mapped
350-701 Practice Question: Refer to the exhibit
Exhibit
crypto ikev2 proposal azure-proposal encryption aes-cbc-256 integrity sha256 group 14 ! crypto ikev2 policy azure-policy match fvrf any proposal azure-proposal ! crypto ipsec transform-set azure-transform esp-aes 256 esp-sha256-hmac mode tunnel ! crypto map AZURE-MAP 10 ipsec-isakmp set peer 20.10.0.1 set transform-set azure-transform match address azure-traffic ! interface Tunnel200 ip address 10.10.10.1 255.255.255.252 tunnel source GigabitEthernet0/0 tunnel destination 20.10.0.1 tunnel mode ipsec ipv4 crypto map AZURE-MAP ! ip access-list extended azure-traffic permit ip 192.168.0.0 0.0.255.255 172.16.0.0 0.0.255.255
Refer to the exhibit. A network engineer configures a site-to-site VPN between a Cisco router and an Azure VPN gateway. After configuration, the tunnel is not coming up. Which issue is most likely causing the problem?
⚠ Common exam trap
Cisco often tests the concept that IKEv2 proposal mismatches are a frequent cause of tunnel failures when connecting to cloud providers like Azure, AWS, or GCP, and candidates mistakenly blame ACLs or crypto map issues instead of verifying the transform sets.
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
✓
Missing IKEv2 proposal match on the Azure side
The most likely issue is a mismatch in IKEv2 proposals between the Cisco router and the Azure VPN gateway. Azure requires specific IKEv2 encryption (e.g., AES256), integrity (e.g., SHA256), and DH group (e.g., DH Group 14) parameters. If the Cisco router's crypto ikev2 proposal does not exactly match the Azure-side settings, the IKEv2 SA negotiation fails, preventing the tunnel from coming up.
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 access list is not permitting the correct source/destination traffic
Why it's wrong here
The ACL defines what traffic to encrypt, but the tunnel is formed before traffic is sent.
- ✗
The tunnel mode is not set to transport
Why it's wrong here
Tunnel mode is correct for site-to-site IPsec VPNs over the internet.
- ✓
Missing IKEv2 proposal match on the Azure side
Why this is correct
Azure VPN gateway requires matching IKE proposals; mismatch prevents tunnel establishment.
- ✗
The crypto map does not specify the local identity
Why it's wrong here
Local identity is optional and usually derived from the tunnel source IP.
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
This 350-701 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-701 exam.