The answer is that the ACL on the SVI is explicitly blocking HTTP traffic from other subnets. This is correct because the access control list applied to the VLAN 10 SVI permits HTTP only from the 10.0.0.0/24 subnet, meaning any client outside that range is denied by the implicit deny any at the end of the ACL. On the Cisco DCCOR and CCNP Data Center Core 350-601 exam, this scenario tests your understanding of how SVIs function as Layer 3 gateways and how ACLs applied to them filter inter-VLAN traffic; a common trap is assuming the issue is a missing route or gateway misconfiguration when the real culprit is an overly restrictive ACL. Remember the key distinction: if local subnet clients work but remote ones do not, the problem is almost always a filtering rule, not a routing problem. A useful memory tip is “local works, remote fails? Check the ACL on the SVI rails.”
350-601 Security Practice Question
This 350-601 practice question tests your understanding of security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 ACL_IN
permit tcp 10.0.0.0 0.0.0.255 any eq 80
interface Ethernet1/1
switchport mode access
switchport access vlan 10
ip access-group ACL_IN in
```
Refer to the exhibit. A web server in VLAN 10 with IP 10.0.0.5 is experiencing connectivity issues. Clients from subnet 10.0.0.0/24 can access the server, but clients from other subnets cannot. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ACL denies all traffic from other subnets
The exhibit shows an ACL applied to the VLAN 10 SVI that permits HTTP traffic only from the 10.0.0.0/24 subnet. Since clients from other subnets are denied, the ACL is explicitly blocking all traffic from those subnets, which matches option C. This is the most likely cause because the server is reachable from the local subnet but not from elsewhere, indicating a filtering issue rather than a routing or gateway problem.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 ACL is missing a permit for return traffic
Why it's wrong here
Return traffic is handled by stateful inspection; the ACL is inbound, so return traffic is not affected.
✗
The server's default gateway is incorrect
Why it's wrong here
An incorrect gateway would affect all clients, not just those from other subnets.
✓
The ACL denies all traffic from other subnets
Why this is correct
The ACL only permits traffic from 10.0.0.0/24; all other traffic is implicitly denied.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The ACL permits HTTP only from the local subnet
Why it's wrong here
This is true, but the correct answer is A because it describes the effect of the ACL on other subnets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the concept that an ACL with a single permit statement implicitly denies all other traffic, and candidates may mistakenly think the issue is a missing return traffic permit or a default gateway problem instead of recognizing the ACL's implicit deny behavior.
Detailed technical explanation
How to think about this question
In Cisco IOS, ACLs applied to SVIs filter traffic entering or leaving the VLAN interface. The implicit deny any at the end of an ACL is a fundamental behavior; if only a single permit statement exists for a specific source, all other traffic is denied. In real-world scenarios, this often happens when an ACL is intended to restrict access to a server but fails to include other subnets or protocols, leading to connectivity issues that are misdiagnosed as routing problems.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ACL denies all traffic from other subnets — The exhibit shows an ACL applied to the VLAN 10 SVI that permits HTTP traffic only from the 10.0.0.0/24 subnet. Since clients from other subnets are denied, the ACL is explicitly blocking all traffic from those subnets, which matches option C. This is the most likely cause because the server is reachable from the local subnet but not from elsewhere, indicating a filtering issue rather than a routing or gateway problem.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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