The answer is to use VRF-Lite with SGTs and enforce policies via Cisco ISE. This design achieves defense-in-depth for three-tier segmentation by combining Layer 3 isolation with identity-based micro-segmentation: VRF-Lite creates separate routing tables for the web, app, and database tiers, preventing any Layer 3 leakage, while Security Group Tags (SGTs) enforce granular, policy-based access control that follows the traffic regardless of IP address changes. On the Cisco SCOR 350-701 exam, this question tests your understanding of how to reduce complexity in a zero-trust architecture—the common trap is choosing multiple firewalls or ACLs, which add administrative overhead and scale poorly. Remember the memory tip: “VRF for the road, SGT for the load”—VRFs build the isolated paths, and SGTs carry the policy tags that allow only necessary traffic between tiers.
350-701 Security Concepts Practice Question
This 350-701 practice question tests your understanding of security concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company is designing a secure segmentation strategy for a three-tier web application. They want to isolate the web, application, and database tiers while allowing only necessary traffic. Which design best achieves defense-in-depth while minimizing complexity?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use VRF-Lite with SGTs and enforce policies via Cisco ISE.
Option C is correct because VRF-Lite with Security Group Tags (SGTs) and Cisco ISE provides scalable, policy-based segmentation that follows the defense-in-depth principle. VRF-Lite creates separate routing tables for each tier, while SGTs enforce granular, identity-based access control at the network layer, reducing complexity compared to multiple firewalls or ACLs. This design allows necessary traffic between tiers without relying on IP addresses alone, aligning with zero-trust architecture.
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.
✗
Place each tier in a separate VLAN and rely on ACLs on the distribution switch.
Why it's wrong here
ACLs alone do not provide sufficient control and are hard to manage.
✗
Deploy a dedicated firewall for each tier and connect them in series.
Why it's wrong here
Overly complex and expensive; not a best practice for this scenario.
✓
Use VRF-Lite with SGTs and enforce policies via Cisco ISE.
Why this is correct
Allows granular, policy-based segmentation without per-tier firewalls.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Place a single stateful firewall between each tier with separate interfaces.
Why it's wrong here
Single firewall creates bottleneck and increases failure risk.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that stateful firewalls alone (Option D) or VLANs with ACLs (Option A) provide sufficient segmentation, but the trap is that defense-in-depth requires policy-based, identity-aware controls like SGTs to prevent lateral movement and reduce complexity in multi-tier applications.
Trap categories for this question
Scenario analysis trap
Overly complex and expensive; not a best practice for this scenario.
Detailed technical explanation
How to think about this question
VRF-Lite (Virtual Routing and Forwarding) creates multiple virtual routing instances on a single switch, isolating traffic between tiers at Layer 3 without requiring separate physical hardware. SGTs, defined via Cisco ISE and propagated using Cisco TrustSec, allow policies based on user, device, or application identity rather than IP addresses, enabling dynamic segmentation even in environments with overlapping IP subnets. In real-world deployments, this approach reduces firewall rule sprawl and simplifies compliance audits by centralizing policy management.
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 Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use VRF-Lite with SGTs and enforce policies via Cisco ISE. — Option C is correct because VRF-Lite with Security Group Tags (SGTs) and Cisco ISE provides scalable, policy-based segmentation that follows the defense-in-depth principle. VRF-Lite creates separate routing tables for each tier, while SGTs enforce granular, identity-based access control at the network layer, reducing complexity compared to multiple firewalls or ACLs. This design allows necessary traffic between tiers without relying on IP addresses alone, aligning with zero-trust architecture.
What should I do if I get this 350-701 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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