PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. 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 company is using Cloud Interconnect with multiple VLAN attachments. They want to implement traffic shaping to prioritize real-time traffic over bulk transfers. Which THREE actions should they take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up Cloud Router with BGP QoS policies to match DSCP values
Option A is correct because Cloud Router with BGPQoS policies can match DSCP values to prioritize traffic. By configuring BGP QoS policies, you can map specific DSCP values to different traffic classes, allowing Cloud Interconnect to apply traffic shaping that prioritizes real-time traffic (e.g., VoIP) over bulk transfers. This leverages BGP community attributes to signal QoS requirements across the hybrid connection.
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.
✓
Set up Cloud Router with BGP QoS policies to match DSCP values
Read the scenario before looking for a memorised answer.
✗
Use VPC flow logs to identify heavy traffic flows
Why it's wrong here
Flow logs are monitoring, not shaping.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse monitoring tools (VPC flow logs) or unrelated services (Cloud NAT) with traffic shaping mechanisms, overlooking that DSCP marking and BGPQoS policies are the correct approach for prioritizing traffic on Cloud Interconnect.
Detailed technical explanation
How to think about this question
Traffic shaping on Cloud Interconnect relies on DSCP markings and BGPQoS policies to classify and prioritize traffic at the network layer. DSCP values (e.g., EF for VoIP, AF41 for video) are set on on-premises routers and matched by Cloud Router policies to assign appropriate forwarding treatment. In a real-world scenario, bulk transfers (e.g., backups) might be marked with DSCP CS0 or AF11, while real-time traffic uses EF, ensuring low-latency handling during congestion.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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.
Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up Cloud Router with BGP QoS policies to match DSCP values — Option A is correct because Cloud Router with BGP QoS policies can match DSCP values to prioritize traffic. By configuring BGP QoS policies, you can map specific DSCP values to different traffic classes, allowing Cloud Interconnect to apply traffic shaping that prioritizes real-time traffic (e.g., VoIP) over bulk transfers. This leverages BGP community attributes to signal QoS requirements across the hybrid connection.
What should I do if I get this PCNE 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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Question Discussion
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