Achieve Highest SLA with Dedicated Interconnect Design
A company needs a dedicated, low-latency connection from their on-premises data center to GCP with a 10 Gbps capacity. They require the highest availability and service level agreement (SLA). Which connectivity option should they choose?
Quick Answer
The answer is Dedicated Interconnect with two connections to different meet-me rooms. This configuration achieves the highest availability SLA because it eliminates single points of failure at both the physical cabling layer and the facility level, ensuring that if one meet-me room experiences an outage, the redundant connection in a separate facility maintains your 10 Gbps dedicated, low-latency link to GCP. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of how to meet the 99.99% SLA requirement by designing for physical diversity rather than just adding bandwidth; a common trap is choosing two connections within the same meet-me room, which still leaves you vulnerable to a facility-wide failure. Remember the key principle: for the highest SLA, you need both geographic and facility diversity, not just multiple circuits. A useful memory tip is “two rooms, no doom”—two distinct meet-me rooms eliminate the single-facility point of failure.
⚠ Common exam trap
Google Cloud often tests the misconception that Partner Interconnect can match the SLA of Dedicated Interconnect, but the key trap is that Partner Interconnect's SLA is limited to the partner's network and does not cover the entire path from on-premises to GCP.
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
✓
Dedicated Interconnect with two connections to different meet-me rooms.
Dedicated Interconnect provides a direct, private connection between the on-premises data center and GCP with 10 Gbps capacity. By using two connections to different meet-me rooms, the company achieves the highest availability and meets the 99.99% SLA, as this eliminates single points of failure at the physical layer and within a single facility.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Carrier Peering using Equinix or other carrier.
Why it's wrong here
Carrier peering provides access to Google services, not GCP resources like VPC.
- ✓
Dedicated Interconnect with two connections to different meet-me rooms.
Why this is correct
Dedicated Interconnect provides dedicated, low-latency connection with high SLA.
- ✗
Partner Interconnect with two VLAN attachments from different providers.
Why it's wrong here
Partner Interconnect has lower SLA and relies on partner network.
- ✗
Cloud VPN with two tunnels from different VPN gateways.
Why it's wrong here
VPN runs over internet, not dedicated; higher latency and lower SLA.
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Same concept, more angles
1 more way this is tested on PCNE
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Variation 1. A company needs to connect on-premises to GCP using Dedicated Interconnect with a 10 Gbps link, and they require high availability. They plan to use a single VLAN attachment. What is the best design?
medium- ✓ A.Deploy two interconnects with one VLAN attachment each.
- B.Deploy one interconnect with one VLAN attachment and a VPN as backup.
- C.Deploy one interconnect with one VLAN attachment and use static routing.
- D.Deploy two VLAN attachments on the same interconnect with separate BGP sessions.
Why A: For high availability with Dedicated Interconnect, you need two separate physical connections (interconnects) to avoid a single point of failure. Each interconnect must have its own VLAN attachment and BGP session to ensure that if one link fails, traffic can still flow over the other. A single VLAN attachment cannot provide redundancy because it is tied to one physical interconnect.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNE practice question is part of Courseiva's free Google Cloud 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 PCNE exam.