PCNE Implementing a Virtual Private Cloud Practice Question
Exhibit
$ gcloud compute routers describe my-router --region=us-central1 bgp: asn: 65000 advertiseMode: DEFAULT advertisedGroups: - ALL_SUBNETS advertisedIpRanges: - range: 10.0.0.0/16 - range: 10.1.0.0/16 keepaliveInterval: 20 session Range: 169.254.0.0/16 bgpPeers: - interfaceName: vpn-tunnel-1 ipAddress: 169.254.0.1 peerIpAddress: 169.254.0.2 peerAsn: 65001 advertisedRoutePriority: 100 status: UP statusReason: '' - interfaceName: vpn-tunnel-2 ipAddress: 169.254.0.5 peerIpAddress: 169.254.0.6 peerAsn: 65001 advertisedRoutePriority: 100 status: DOWN statusReason: 'Connectivity error'
Refer to the exhibit. A company uses a Cloud Router with two BGP sessions for an HA VPN to on-premises. Traffic is not flowing correctly to the on-premises network. What is the most likely issue?
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 BGP session with vpn-tunnel-2 is down, causing asymmetric routing.
The exhibit shows that vpn-tunnel-2's BGP session is in a state other than 'established' (likely down), while vpn-tunnel-1 is established. A down BGP session on one tunnel can cause asymmetric routing or loss of connectivity, especially if traffic is sent over the down tunnel. Option B correctly identifies this. Option A is incorrect because the advertised route priority (MED) of 100 is not the issue; the problem is the session state. Option C is incorrect because keepalive interval 20 seconds is standard. Option D is incorrect because private ASN 65000 is allowed in Cloud Router BGP configurations.
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 advertised route priority is too low.
Why it's wrong here
Priority 100 is acceptable.
- ✓
The BGP session with vpn-tunnel-2 is down, causing asymmetric routing.
Why this is correct
A down BGP session can disrupt proper route advertisement and traffic flow.
- ✗
The keepalive interval is too high.
Why it's wrong here
20 seconds is a standard keepalive interval.
- ✗
The ASN 65000 is private and not allowed.
Why it's wrong here
Private ASNs are allowed for Cloud Router.
Quick reference
Asymmetric Encryption Algorithm Comparison
| Algorithm | Key Exchange | Signatures | Equivalent Security Key | Notes |
|---|---|---|---|---|
| RSA-3072 | Yes | Yes | 128-bit | Widely deployed; slow for bulk data |
| ECDSA P-256 | No | Yes | 128-bit | Fast signatures; standard TLS certs |
| ECDH / ECDHE | Yes | No | 128-bit | Perfect forward secrecy in TLS 1.3 |
| DH / DHE | Yes | No | 128-bit (3072-bit key) | Replaced by ECDHE in modern TLS |
| Ed25519 | No | Yes | ~128-bit | SSH keys, modern PKI |
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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.