- A
Use Direct Peering
Why wrong: Direct Peering is not a Google Cloud service; it uses public IPs and does not provide an SLA.
- B
Use Partner Interconnect with a 10 Gbps connection
Why wrong: Partner Interconnect can offer 10 Gbps but the SLA depends on the partner and is typically lower than 99.99%.
- C
Use Cloud VPN with two tunnels for redundancy
Why wrong: Cloud VPN maxes out at 3 Gbps per tunnel and does not offer a 99.99% SLA.
- D
Use Dedicated Interconnect with two VLAN attachments
Dedicated Interconnect provides 10 Gbps connections with a 99.99% SLA when using redundant links.
Question 955 of 1,000
hardMultiple ChoiceObjective-mapped
Dedicated Interconnect vs Other Connectivity Options
This PCSE practice question tests your understanding of pcse exam topics. 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 company requires a secure, dedicated connection between their on-premises data center and Google Cloud with bandwidth of 10 Gbps and a 99.99% SLA. Which connectivity option should they use?
Quick Answer
The answer is Dedicated Interconnect with two VLAN attachments, as it is the only option that provides a dedicated, secure connection with 10 Gbps bandwidth and a 99.99% SLA when configured with redundant links. This connectivity option establishes a direct physical link between your on-premises data center and Google Cloud, bypassing the public internet entirely, which ensures both high throughput and consistent performance. On the Google Professional Cloud Security Engineer exam, this scenario tests your ability to match specific bandwidth and SLA requirements to the correct connectivity option, often appearing as a trap where Cloud VPN seems viable but fails on both bandwidth limits (max 3 Gbps per tunnel) and SLA guarantees. A common mistake is choosing Partner Interconnect, but remember its SLA depends on the partner, not Google. Memory tip: think "Dedicated for Dedicated needs" — if the requirement demands a guaranteed 99.99% SLA and high bandwidth, only Dedicated Interconnect with redundant VLAN attachments fits the bill.
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
✓
Use Dedicated Interconnect with two VLAN attachments
Option D is correct because Dedicated Interconnect offers 10 Gbps or 100 Gbps connections with a 99.99% SLA when configured with redundant connections (e.g., two VLAN attachments). Option A is wrong because Direct Peering uses public IPs and does not provide an SLA. Option B is wrong because Partner Interconnect, while offering up to 10 Gbps, does not guarantee a 99.99% SLA—it varies by partner. Option C is wrong because Cloud VPN supports lower bandwidth (up to 3 Gbps per tunnel) and does not offer a 99.99% SLA.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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 Direct Peering
Why it's wrong here
Direct Peering is not a Google Cloud service; it uses public IPs and does not provide an SLA.
- ✗
Use Partner Interconnect with a 10 Gbps connection
Why it's wrong here
Partner Interconnect can offer 10 Gbps but the SLA depends on the partner and is typically lower than 99.99%.
- ✗
Use Cloud VPN with two tunnels for redundancy
Why it's wrong here
Cloud VPN maxes out at 3 Gbps per tunnel and does not offer a 99.99% SLA.
- ✓
Use Dedicated Interconnect with two VLAN attachments
Why this is correct
Dedicated Interconnect provides 10 Gbps connections with a 99.99% SLA when using redundant links.
Related concept
Access ports place end devices into a single VLAN.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related PCSE questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this PCSE question test?
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: Use Dedicated Interconnect with two VLAN attachments — Option D is correct because Dedicated Interconnect offers 10 Gbps or 100 Gbps connections with a 99.99% SLA when configured with redundant connections (e.g., two VLAN attachments). Option A is wrong because Direct Peering uses public IPs and does not provide an SLA. Option B is wrong because Partner Interconnect, while offering up to 10 Gbps, does not guarantee a 99.99% SLA—it varies by partner. Option C is wrong because Cloud VPN supports lower bandwidth (up to 3 Gbps per tunnel) and does not offer a 99.99% SLA.
What should I do if I get this PCSE question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related PCSE questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 24, 2026
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