JNCIA-SEC Srx Series Service Gateways Practice Question
Which hardware component on high-end SRX Series devices provides dedicated processing for security services such as firewall policies, IPsec VPNs, and NAT?
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
✓
Security Processing Unit (SPU)
High-end SRX Series devices utilize specialized hardware modules known as Security Processing Units (SPUs) to accelerate data plane security tasks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch Control Board (SCB)
Why it's wrong here
The SCB provides clocking, system management, and switch fabric connectivity for high-end chassis.
- ✗
Modular Port Concentrator (MPC)
Why it's wrong here
MPCs host line cards and physical interfaces but do not primarily execute the security firewall session logic.
- ✓
Security Processing Unit (SPU)
Why this is correct
SPUs provide dedicated hardware acceleration for security services, firewall session processing, NAT, and IPsec VPNs.
- ✗
Routing Engine (RE)
Why it's wrong here
The Routing Engine handles control plane functions, device management, and routing protocols.
Visual reference
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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIA-SEC practice question is part of Courseiva's free Juniper Networks 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 JNCIA-SEC exam.