PCNE Network Connectivity Center (NCC) hub Practice Question
Your company uses Network Connectivity Center (NCC) to manage multiple on-premises sites connected via Cloud VPN and Partner Interconnect. You create a NCC hub and attach spokes (VPN tunnels and VLAN attachments). Traffic between two on-premises sites (Site A and Site B) should flow through Google Cloud. However, traffic is not passing between the sites. What is the most likely cause?
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
✓
The VPN spokes do not have custom dynamic route exchange enabled, so routes from Site A are not advertised to Site B.
The most likely cause is that custom dynamic route exchange is not enabled on the VPN spokes. By default, NCC does not advertise routes between VPN spokes unless you explicitly enable custom dynamic route exchange. Without this, routes from Site A are not propagated to Site B, preventing inter-site traffic through Google Cloud. Option A is incorrect because NCC uses dynamic routing, so static routes to the VPC are unnecessary. Option B is correct because it correctly identifies the need for custom dynamic route exchange to advertise routes between spokes. Option C is incorrect because NCC fully supports Cloud VPN as a spoke type. Option D is incorrect because the NCC hub is a global resource and does not need to reside in the same VPC as the sites' VPCs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The on-premises routers need static routes pointing to the Google Cloud VPC for inter-site traffic.
Why it's wrong here
NCC handles dynamic routing.
- ✓
The VPN spokes do not have custom dynamic route exchange enabled, so routes from Site A are not advertised to Site B.
Why this is correct
NCC requires route exchange to be enabled on spokes to propagate routes.
- ✗
Network Connectivity Center does not support Cloud VPN as a spoke type.
Why it's wrong here
NCC supports VPN as a spoke.
- ✗
The NCC hub must be in the same VPC network as the sites' VPCs.
Why it's wrong here
NCC works across VPCs; it's a global resource.
Visual reference
Go deeper
Related to this question
About these practice questions
This PCNE question is part of Courseiva's 961-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.