CND Network Perimeter Protection Practice Question
An enterprise firewall is experiencing asymmetric routing where TCP SYN packets enter through Firewall A, but the return SYN-ACK packets exit through Firewall B due to dynamic routing changes. What firewall feature must be enabled to synchronize connection state tables between Firewall A and Firewall B and prevent connection drops?
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
✓
Stateful Session Synchronization (Cluster State Sync)
Stateful firewalls require session synchronization (such as Cisco Stateful Failover or Palo Alto HA session sync) to share connection state tables across cluster nodes in asymmetric paths.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Strict TCP handshake validation
Why it's wrong here
Strict validation would cause firewalls to drop asynchronous return packets.
- ✗
Unicast RPF (Reverse Path Forwarding)
Why it's wrong here
uRPF checks source IP routability to prevent spoofing, often dropping asymmetric traffic.
- ✓
Stateful Session Synchronization (Cluster State Sync)
Why this is correct
Session synchronization shares active session tables across firewalls to handle asymmetric routing.
- ✗
NAT hairpinning
Why it's wrong here
NAT hairpinning allows internal clients to access internal servers via public IPs.
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
This CND question is part of Courseiva's 323-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam 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 EC-Council exam blueprint
This CND practice question is part of Courseiva's free EC-Council 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 CND exam.