SSCP Network and Communications Security Practice Question
Which security control can prevent a rogue DHCP server from assigning incorrect gateway addresses to clients?
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
✓
DHCP snooping
DHCP snooping is a switch feature that filters DHCP messages based on trusted ports, blocking rogue DHCP servers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IP source guard
Why it's wrong here
IP source guard filters traffic by matching source IP and MAC against the DHCP snooping binding table, blocking spoofed addresses on access ports. It tempts as a DHCP-derived control, but it cannot prevent a rogue server from issuing the initial lease that populates that table.
- ✗
Dynamic ARP inspection
Why it's wrong here
Dynamic ARP inspection validates ARP packets against the DHCP snooping binding table, preventing ARP spoofing rather than rogue DHCP offers. It tempts because it depends on DHCP snooping data, but the binding table must already exist, so it cannot stop the rogue server assigning addresses.
- ✗
Port security
Why it's wrong here
Port security restricts which MAC addresses may appear on a switch port, addressing Layer 2 access, not DHCP message legitimacy. It tempts as a switch hardening control, but DHCP snooping is what drops server-sourced DHCP offers arriving on untrusted ports.
- ✓
DHCP snooping
Why this is correct
DHCP snooping designates trusted ports and filters server replies on untrusted ones, so a rogue DHCP server cannot hand out a falsified default gateway. This directly satisfies the stem's constraint of preventing incorrect gateway assignment.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.