NSE7_SDW Security Profiles Routing And IPsec Practice Question
A FortiGate device is running ADVPN 2.0 with OSPF. A spoke experiences transient routing loops when a shortcut tunnel tears down due to inactivity timeout. Which configuration adjustment on the FortiGate hub and spokes prevents these temporary routing blackholes or loops during shortcut teardown?
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
✓
Adjust the administrative distance or use route redistribution filters with appropriate metrics so hub routes and shortcut routes do not conflict during teardown
When shortcuts time out, routes must cleanly transition back to the hub route without creating transient routing loops. Adjusting route redistribution metrics, using specific distance values, or configuring 'shortcut-routing' / route-map timers / asymmetric routing settings prevents loops. In FortiOS ADVPN, setting appropriate dead timers or using dynamic routing distance adjustments ensures the hub route has a predictable preference when the shortcut drops.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable OSPF on the spoke units and rely entirely on static default routes
Why it's wrong here
Relying solely on static default routes defeats the purpose of dynamic routing in ADVPN.
- ✓
Adjust the administrative distance or use route redistribution filters with appropriate metrics so hub routes and shortcut routes do not conflict during teardown
Why this is correct
Correct. Proper administrative distance tuning or route filtering ensures that when a shortcut route is removed from the routing table, the fallback hub route takes over cleanly without routing loops.
- ✗
Set the IPsec phase 1 lifetime to infinite to prevent shortcuts from timing out
Why it's wrong here
An infinite lifetime prevents shortcut cleanup and wastes dynamic resources.
- ✗
Configure asymmetric routing bypass on all firewall policies
Why it's wrong here
Asymmetric routing bypass disables strict state checking, which does not solve routing loops.
Visual reference
Quick reference
Asymmetric Encryption Algorithm Comparison
| Algorithm | Key Exchange | Signatures | Equivalent Security Key | Notes |
|---|---|---|---|---|
| RSA-3072 | Yes | Yes | 128-bit | Widely deployed; slow for bulk data |
| ECDSA P-256 | No | Yes | 128-bit | Fast signatures; standard TLS certs |
| ECDH / ECDHE | Yes | No | 128-bit | Perfect forward secrecy in TLS 1.3 |
| DH / DHE | Yes | No | 128-bit (3072-bit key) | Replaced by ECDHE in modern TLS |
| Ed25519 | No | Yes | ~128-bit | SSH keys, modern PKI |
About these practice questions
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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 Fortinet exam blueprint
This NSE7_SDW practice question is part of Courseiva's free Fortinet 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 NSE7_SDW exam.