EX294 Coordinate rolling updates Practice Question
This EX294 practice question tests your understanding of coordinate rolling updates. 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.
A DevOps engineer is responsible for coordinating a rolling update of a Red Hat OpenShift Container Platform 4.12 cluster with 10 worker nodes. The cluster hosts a stateful application that uses persistent volumes with ReadWriteOnce access mode. The update involves a minor version upgrade of the cluster from 4.12.0 to 4.12.5. The engineer uses the recommended `oc adm upgrade` command. During the update, after the first worker node is updated, the engineer notices that the node's status shows 'NotReady' and the cluster version operator reports a degraded status. A check of the node logs reveals 'kubelet: Failed to run kubelet: Could not get kubelet config from cluster: could not get config from cluster: context deadline exceeded'. Which action should the engineer take first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the network connectivity between the updated node and the control plane nodes on port 6443.
Option B is correct because the error indicates the kubelet cannot communicate with the control plane on port 6443, likely due to a network issue (e.g., firewall, DNS, or routing). Option A is wrong because rolling back the entire cluster is a drastic first step; the issue is likely isolated. Option C is wrong because changing kubelet parameters is not a standard resolution for connectivity problems. Option D is wrong because rebuilding the node from scratch is unnecessary and time-consuming; the issue is likely resolvable by restoring network connectivity.
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.
✗
Rebuild the node from scratch using the machine config operator.
Why it's wrong here
Rebuilding is a last resort; check network first.
✓
Check the network connectivity between the updated node and the control plane nodes on port 6443.
Why this is correct
The error suggests a timeout, so network connectivity is the likely cause.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Roll back the entire cluster to version 4.12.0 using the `oc adm upgrade --to=4.12.0` command.
Why it's wrong here
Rolling back the whole cluster is excessive; the issue may be limited to one node.
✗
Increase the kubelet's `--node-status-update-frequency` parameter on the updated node.
Why it's wrong here
This parameter affects status reporting, not initial configuration retrieval.
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 EX294 NAT questions on configuration and troubleshooting.
Coordinate rolling updates — This question tests Coordinate rolling updates — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Check the network connectivity between the updated node and the control plane nodes on port 6443. — Option B is correct because the error indicates the kubelet cannot communicate with the control plane on port 6443, likely due to a network issue (e.g., firewall, DNS, or routing). Option A is wrong because rolling back the entire cluster is a drastic first step; the issue is likely isolated. Option C is wrong because changing kubelet parameters is not a standard resolution for connectivity problems. Option D is wrong because rebuilding the node from scratch is unnecessary and time-consuming; the issue is likely resolvable by restoring network connectivity.
What should I do if I get this EX294 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 EX294 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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