JNCIS-ENT Layer 2 Security Practice Question
An administrator enables Dynamic ARP Inspection (DAI) on a VLAN that uses DHCP snooping for IP binding verification. A static client on the same VLAN cannot communicate with the default gateway. What is the most likely cause of this issue?
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
✓
The static client's IP-to-MAC binding is missing from the DHCP snooping database, causing DAI drops.
Static clients do not participate in DHCP exchanges, so they are missing from the DHCP snooping binding database, causing DAI to drop their ARP packets unless static ARP entries are added.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The static client is using an IP address outside the DHCP pool range.
Why it's wrong here
DAI validates against the DHCP snooping database, not the DHCP pool range.
- ✗
The client's MAC address violates the port security maximum limit.
Why it's wrong here
Port security and DAI are separate features; MAC limits do not cause ARP inspection drops unless explicitly violated.
- ✗
DAI requires all interfaces to be trusted on the VLAN.
Why it's wrong here
Making all interfaces trusted defeats the security purpose of DAI.
- ✓
The static client's IP-to-MAC binding is missing from the DHCP snooping database, causing DAI drops.
Why this is correct
Static clients do not generate DHCP bindings, requiring static IP source entries or static ARP inspection entries for DAI to permit their ARP packets.
Visual reference
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 Juniper Networks exam blueprint
This JNCIS-ENT 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 JNCIS-ENT exam.