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CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and 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.
Drag and drop the following steps into the correct order to configure a Layer 3 switch to perform DHCP relay agent and DHCP snooping for a remote DHCP server.
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
✓
On the DHCP server, create a DHCP pool for the client subnet with the correct network, default gateway, and lease parameters.
Correct order: 1) Create DHCP pool on the server to have valid lease parameters; 2) Assign IP address to the SVI so it can act as the gateway and relay agent for the subnet; 3) Globally enable DHCP snooping to activate the feature; 4) Enable snooping on the client VLAN so that only that VLAN’s DHCP traffic is filtered; 5) Set the interface facing the server as trusted to allow DHCP replies; 6) Configure ip helper-address on the SVI to forward client DHCP broadcasts to the server. Each step depends on the previous: the server must be ready; the SVI needs an IP before the helper can be applied; snooping must be globally on before per-VLAN settings; trusted port must be defined before relayed replies are accepted; finally, the helper address enables the actual relay.
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.
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 200-301 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: On the DHCP server, create a DHCP pool for the client subnet with the correct network, default gateway, and lease parameters. — Correct order: 1) Create DHCP pool on the server to have valid lease parameters; 2) Assign IP address to the SVI so it can act as the gateway and relay agent for the subnet; 3) Globally enable DHCP snooping to activate the feature; 4) Enable snooping on the client VLAN so that only that VLAN’s DHCP traffic is filtered; 5) Set the interface facing the server as trusted to allow DHCP replies; 6) Configure ip helper-address on the SVI to forward client DHCP broadcasts to the server. Each step depends on the previous: the server must be ready; the SVI needs an IP before the helper can be applied; snooping must be globally on before per-VLAN settings; trusted port must be defined before relayed replies are accepted; finally, the helper address enables the actual relay.
What should I do if I get this 200-301 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 200-301 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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Last reviewed: Jun 14, 2026
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