SCAZT Network And Cloud Security Practice Question
You are troubleshooting an Umbrella SIG tunnel connection. The IPsec tunnel is up, but users report timeouts. What is the most likely cause if the tunnel MTU is not adjusted correctly?
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
✓
MTU mismatch causing packet fragmentation
When using SIG tunnels, packet fragmentation can occur if the MTU is not set correctly to account for the IPsec overhead, leading to dropped traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
MTU mismatch causing packet fragmentation
Why this is correct
IPsec adds overhead; if the path MTU is not adjusted, large packets are dropped.
- ✗
DNS resolution failure in the tunnel
Why it's wrong here
This would cause domain lookup errors, not general timeouts.
- ✗
Incorrect IKEv2 Phase 2 proposal
Why it's wrong here
This would prevent the tunnel from establishing entirely.
- ✗
Missing Proxy PAC file
Why it's wrong here
PAC files are for explicit proxy, not tunnel-based SIG.
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.
About these practice questions
Courseiva writes every SCAZT question from scratch — 317 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Cisco exam blueprint
This SCAZT 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 SCAZT exam.