- A
Reduce the number of ECMP paths on the on-premises routers to lower CPU utilization.
Why wrong: This may reduce CPU but does not address BGP flap issues; it can also cause uneven traffic distribution.
- B
Increase the number of ECMP paths to improve traffic distribution.
Why wrong: More ECMP paths increase CPU load on routers and can worsen BGP flaps.
- C
Add a second physical interface on each cluster node and peer with multiple on-premises routers.
This provides redundancy and reduces load per BGP session, minimizing flaps and improving reliability.
- D
Replace BGP with static routes between the cluster and on-premises network.
Why wrong: Static routes are not scalable and require manual updates; they do not provide the dynamic routing needed for container workloads.
Quick Answer
The answer is adding a second physical interface on each cluster node and peering with multiple on-premises routers. This solution directly addresses the root cause of intermittent connectivity failures by eliminating the single point of failure in BGP peering redundancy for Kubernetes with Calico. When a single physical interface handles all BGP sessions, high CPU utilization on on-premises routers during peak hours can trigger BGP flaps, destabilizing ECMP routes and disrupting pod-to-pod communication across Availability Zones. A second interface distributes control-plane load and provides a failover path, ensuring that if one session flaps, traffic still flows through the redundant peer. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding of hybrid cloud networking and Calico’s BGP architecture—a common trap is assuming ECMP alone provides reliability, but ECMP requires stable BGP sessions to function. Remember the memory tip: “Two wires, no fires”—dual interfaces prevent a single flap from burning your connectivity.
CV0-004 Cloud Architecture and Design Practice Question
This CV0-004 practice question tests your understanding of cloud architecture and design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 cloud architect manages a hybrid cloud environment where on-premises workloads are being migrated to a public cloud provider. The company uses a cloud-native container orchestration platform (e.g., Amazon EKS) for microservices. Recently, a critical application experienced intermittent connectivity failures between microservices during peak hours. The architect observes that the Kubernetes cluster uses a Calico network plugin with BGP peering to on-premises routers. The cluster nodes are spread across three Availability Zones, and the application pods communicate across zones. The architect also notes that the BGP session between the cluster and on-premises routers uses a single physical interface per node, and the on-premises routers have equal-cost multipath (ECMP) configured for the cluster node IPs. During peak hours, the on-premises routers experience high CPU utilization, and some BGP flaps occur. Which of the following is the MOST effective solution to improve connectivity reliability?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Add a second physical interface on each cluster node and peer with multiple on-premises routers.
Option C is correct because adding a second physical interface per node enables redundant BGP peering with multiple on-premises routers, eliminating the single point of failure. This reduces BGP flap impact during peak hours by distributing control-plane load and providing failover paths, directly addressing the high CPU utilization and intermittent connectivity caused by ECMP instability.
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.
- ✗
Reduce the number of ECMP paths on the on-premises routers to lower CPU utilization.
Why it's wrong here
This may reduce CPU but does not address BGP flap issues; it can also cause uneven traffic distribution.
- ✗
Increase the number of ECMP paths to improve traffic distribution.
Why it's wrong here
More ECMP paths increase CPU load on routers and can worsen BGP flaps.
- ✓
Add a second physical interface on each cluster node and peer with multiple on-premises routers.
Why this is correct
This provides redundancy and reduces load per BGP session, minimizing flaps and improving reliability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Replace BGP with static routes between the cluster and on-premises network.
Why it's wrong here
Static routes are not scalable and require manual updates; they do not provide the dynamic routing needed for container workloads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume ECMP tuning (reducing or increasing paths) is the fix, but the root cause is the single physical interface creating a control-plane bottleneck and flap vulnerability, not the number of ECMP paths.
Detailed technical explanation
How to think about this question
Calico with BGP peering uses per-node BGP sessions to advertise pod CIDRs to on-premises routers. With a single physical interface, all BGP control-plane traffic and data-plane traffic share the same link; during peak hours, high CPU on routers can cause BGP keepalive timeouts (default 3 seconds with 1-second hold timer in some configurations), leading to flaps. Adding a second interface allows separate BGP sessions to different routers, distributing the control-plane load and providing path redundancy, which stabilizes ECMP hashing and reduces CPU spikes.
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 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.
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Cloud Architecture and Design — This question tests Cloud Architecture and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a second physical interface on each cluster node and peer with multiple on-premises routers. — Option C is correct because adding a second physical interface per node enables redundant BGP peering with multiple on-premises routers, eliminating the single point of failure. This reduces BGP flap impact during peak hours by distributing control-plane load and providing failover paths, directly addressing the high CPU utilization and intermittent connectivity caused by ECMP instability.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This CV0-004 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CV0-004 exam.
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