This CCSP practice question tests your understanding of cloud application security. 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 financial services company is adopting a cloud-native microservices architecture. They want to ensure that only authorized services can communicate with each other, and that all inter-service communication is encrypted. Which of the following is the BEST approach?
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
✓
Implement a service mesh with mutual TLS (mTLS) and fine-grained access policies
Option C is correct because a service mesh (e.g., Istio) provides sidecar proxies that handle mTLS and access policies transparently. Option A (security groups) operate at network level but do not encrypt nor provide service identity. Option B (API gateways) centralize external traffic but not internal. Option D (VPC peering) connects networks but does not enforce application-level authorization or encryption per service.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use network security groups to restrict traffic between service subnets
Why it's wrong here
Security groups provide network-layer filtering but no encryption or service identity.
✓
Implement a service mesh with mutual TLS (mTLS) and fine-grained access policies
Why this is correct
Service mesh provides encryption, identity, and policy enforcement at the application layer.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
Connect services using VPC peering and enable encryption in transit
Why it's wrong here
VPC peering connects networks but does not provide per-service authorization or encryption automatically.
✗
Deploy an API gateway and route all internal traffic through it
Why it's wrong here
API gateway is for external facing; internal traffic would introduce latency and bottleneck.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CCSP questions on access control and AAA configuration.
Cloud Application Security — This question tests Cloud Application Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Implement a service mesh with mutual TLS (mTLS) and fine-grained access policies — Option C is correct because a service mesh (e.g., Istio) provides sidecar proxies that handle mTLS and access policies transparently. Option A (security groups) operate at network level but do not encrypt nor provide service identity. Option B (API gateways) centralize external traffic but not internal. Option D (VPC peering) connects networks but does not enforce application-level authorization or encryption per service.
What should I do if I get this CCSP question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CCSP questions on access control and AAA configuration.
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?
Authentication checks who the user is.
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