PCNE Tests SLA Topologies, Route Precedence and Control Placement — Not Subnet Math Alone
For engineers who design and run VPC, hybrid and multicloud networks. The shift: count connections, interfaces and availability domains against the quoted SLA, and put each control at the layer and level that can enforce it.
Check Your Readiness →Most candidates understand Google Cloud Professional Cloud Network Engineer concepts — and still fail. This exam tests how you apply knowledge under pressure.
Fifty to sixty scenarios built around one deciding adjective: central team, 99.99%, no public IPs, overlapping ranges, client IP preserved. This follows the current six-section PDF; some localised pages still show an older five-section outline. Prefer in-place changes over rebuilds.
Add another firewall rule or a second VPN to prod
Enable custom route export on shared-services and import on prod, and add a Cloud Router custom advertisement for the prod range toward on-premises. Peering never shares dynamic routes or advertises peered ranges automatically.
Create a Cloud DNS forwarding zone pointing on-premises
Create an inbound server policy, which assigns entry-point addresses from VPC subnets for on-premises resolvers to forward to. Forwarding zones handle outbound queries; outbound forwarding replies from 35.199.192.0/19 also need a route back.
Delete and recreate the VPN tunnel
IPsec is up, so the fault is BGP: check peer ASN, link-local addresses, MD5 key and TCP 179 on the new router. Tunnel-down symptoms point instead to shared secret, IKE version, ciphers or peer IP.
Carve another slice of RFC 1918 space for Pods
Use non-RFC 1918 or privately used public (PUPI) ranges to avoid hybrid overlap. Size Pod ranges from nodes times the per-node block, which is a /24 at 110 maximum Pods per node; add ranges for new node pools later.
Build a full mesh of VPC Network Peering connections
Network Connectivity Center VPC spokes give transitive reach without peering quotas. A star topology lets edge spokes reach centre shared services while staying isolated from each other; mesh would let every environment talk.
99.99% needs four connections across two metros, each pair split over different edge availability domains, attached in two regions with global dynamic routing. Redundant links sharing one edge availability domain fail together during maintenance.
In regional mode, Cloud Router only programs learned routes into its own region, so losing one region's Interconnect strands that region's VMs. Global mode lets the surviving link serve every region, with advertised priority (MED) steering preference.
Lower MED is preferred, so that link becomes primary. Give the active path the lower value. Enable BFD for sub-second failure detection instead of BGP hold timers, and keep subnets advertised when switching Cloud Router to custom advertisements.
VPC and NGFW rules match addresses, ports and protocols. Cloud Armor on the global external Application Load Balancer inspects HTTP with OWASP-based WAF rules, applies per-client rate limiting, and Adaptive Protection suggests rules for layer 7 DDoS.
Cloud NAT only translates addresses; intermittent drops usually mean port exhaustion, fixed with more minimum ports, dynamic allocation or extra NAT IPs. Domain allowlists need Secure Web Proxy or an egress firewall policy with FQDN objects.
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Test whether your Interconnect layouts, routing and firewall placements would pass PCNE scrutiny.