This LPIC-2 practice question tests your understanding of system security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 DevOps team manages a Kubernetes cluster on premises. The security team requires that all communication between pods be encrypted. The team decides to use mutual TLS (mTLS). They are using a Linux-based control plane with etcd and kube-apiserver. The current setup uses self-signed certificates for the API server, but the team wants to implement a proper PKI with automated certificate renewal. They have a small budget and prefer open-source tools. Which solution should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Install cert-manager in the cluster and configure an Issuer to sign certificates with automatic renewal.
Option C is correct. cert-manager is a Kubernetes-native tool that automates certificate management and integrates with Let's Encrypt or internal CAs. Option A (OpenSSL manual scripts) is non-automated and error-prone. Option B (Hashicorp Vault) is powerful but complex and has a learning curve, though it's also valid; however, cert-manager is more lightweight for Kubernetes. Option D (Cloudflare's cfssl) is an alternative but not as integrated with Kubernetes; cert-manager is the standard.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Generate certificates using OpenSSL on the control plane and distribute them via Kubernetes secrets manually.
Why it's wrong here
Manual management is not automated and prone to expiration issues.
✓
Install cert-manager in the cluster and configure an Issuer to sign certificates with automatic renewal.
Why this is correct
cert-manager is designed for Kubernetes and provides automated certificate lifecycle management.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Cloudflare's cfssl tool to set up a custom CA and push certificates to nodes via Ansible.
Why it's wrong here
This adds complexity and is not Kubernetes-native.
✗
Deploy Hashicorp Vault with PKI backend and use the Vault agent sidecar.
Why it's wrong here
Vault is a good option but overkill for this specific need; it requires additional setup.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related LPIC-2 NAT questions on configuration and troubleshooting.
System Security — This question tests System Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Install cert-manager in the cluster and configure an Issuer to sign certificates with automatic renewal. — Option C is correct. cert-manager is a Kubernetes-native tool that automates certificate management and integrates with Let's Encrypt or internal CAs. Option A (OpenSSL manual scripts) is non-automated and error-prone. Option B (Hashicorp Vault) is powerful but complex and has a learning curve, though it's also valid; however, cert-manager is more lightweight for Kubernetes. Option D (Cloudflare's cfssl) is an alternative but not as integrated with Kubernetes; cert-manager is the standard.
What should I do if I get this LPIC-2 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related LPIC-2 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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