The answer is that the VACL configuration denies telnet traffic while permitting all other traffic in VLAN 10. This occurs because the VACL applies a sequence of access-map entries: the first entry matches telnet traffic using a TCP port 23 match and explicitly drops it, while the second entry uses an IP any match with a permit action to forward all remaining traffic. On the Cisco DCCOR / CCNP Data Center Core 350-601 exam, this tests your understanding of VACL processing order and implicit deny behavior—a common trap is forgetting that without a final permit any statement, all non-matching traffic would be dropped. Remember that VACLs evaluate entries sequentially, so the deny telnet rule must come before the permit all rule to achieve the desired effect. A helpful memory tip is “Telnet first, drop it fast; permit all others, make it last.”
350-601 Security Practice Question
This 350-601 practice question tests your understanding of 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.
Exhibit
ip access-list extended BLOCK_TELNET
permit tcp any any eq telnet
!
vlan access-map SECURITY 10
match ip address BLOCK_TELNET
action drop
!
vlan access-map SECURITY 20
action forward
!
vlan filter SECURITY vlan-list 10
Refer to the exhibit. What is the effect of this configuration on traffic in VLAN 10?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Telnet traffic is denied; all other traffic is permitted.
The VACL first matches telnet traffic and drops it. The second sequence forwards all other traffic. Thus, only telnet is denied; all other traffic is permitted.
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.
✗
Telnet traffic is permitted; all other traffic is denied.
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 350-601 questions on switching, trunking, and access-port configuration.
Security — This question tests Security — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Telnet traffic is denied; all other traffic is permitted. — The VACL first matches telnet traffic and drops it. The second sequence forwards all other traffic. Thus, only telnet is denied; all other traffic is permitted.
What should I do if I get this 350-601 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 350-601 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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