The correct statement is that Gi0/1 is trusted for DHCP snooping, and Gi0/2 will drop DHCP packets exceeding 10 per second. This is because the `ip dhcp snooping trust` command on an interface designates it as a trusted port, typically the uplink toward the legitimate DHCP server, while all other ports are untrusted by default. The `ip dhcp snooping limit rate 10` command on Gi0/2 enforces a rate limit of 10 packets per second on that untrusted port, causing any DHCP packets beyond that threshold to be dropped as a defense against DHCP starvation attacks. On the ENCOR 350-401 exam, this configuration interpretation tests your ability to distinguish between trust and rate-limiting functions, a common trap being that rate limits apply only to untrusted ports. Remember the memory tip: “Trust the server uplink, rate-limit the rest.”
CCNP Infrastructure Security Practice Question
This 350-401 practice question tests your understanding of infrastructure security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Consider the following DHCP snooping configuration on a Cisco IOS-XE switch:
```
ip dhcp snooping
ip dhcp snooping vlan 10
interface GigabitEthernet0/1
ip dhcp snooping trust
!
interface GigabitEthernet0/2
ip dhcp snooping limit rate 10
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Gi0/1 is trusted for DHCP snooping, and Gi0/2 will drop DHCP packets exceeding 10 per second.
DHCP snooping is enabled globally and for VLAN 10. Gi0/1 is trusted (typically uplink to DHCP server). Gi0/2 is untrusted and has a rate limit of 10 packets per second to prevent DHCP starvation.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Gi0/1 is trusted for DHCP snooping, and Gi0/2 will drop DHCP packets exceeding 10 per second.
Why this is correct
Correct. Trusted ports are typically for DHCP servers; rate limit applies to untrusted ports.
Related concept
Access ports place end devices into a single VLAN.
✗
Gi0/2 is trusted and will forward all DHCP packets without rate limiting.
Why it's wrong here
Incorrect. Gi0/2 is not configured as trust, so it is untrusted.
✗
The switch will only snoop DHCP on VLAN 10, but rate limiting applies to all VLANs.
Why it's wrong here
Incorrect. Rate limit is per interface, not per VLAN.
✗
Gi0/1 will rate-limit DHCP packets to 10 per second.
Why it's wrong here
Incorrect. Gi0/1 has no rate limit configured.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
Infrastructure Security — This question tests Infrastructure Security — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Gi0/1 is trusted for DHCP snooping, and Gi0/2 will drop DHCP packets exceeding 10 per second. — DHCP snooping is enabled globally and for VLAN 10. Gi0/1 is trusted (typically uplink to DHCP server). Gi0/2 is untrusted and has a rate limit of 10 packets per second to prevent DHCP starvation.
What should I do if I get this 350-401 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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