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Google Professional-Cloud-Network-Engineer Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Configuring cloud network security solutions	12%	- Secure Web Proxy 1. URL filtering, access control - VPC Service Controls 1. Service perimeters, access levels - Cloud Armor 1. Security policies, WAF rules, DDoS protection
Topic 2: Configuring managed network services	16%	- Load balancing 1. Backend services, NEGs, health checks 2. Internal/external, regional/global types - Cloud DNS 1. Public/private zones, forwarding, peering 2. DNSSEC, logging - Cloud NAT 1. Address allocation, port management - Cloud CDN 1. Caching rules, origin configuration
Topic 3: Managing, monitoring, and troubleshooting network operations	12%	- Monitoring and logging 1. Network Intelligence Center 2. VPC Flow Logs, Firewall Insights 3. Cloud Logging, Cloud Monitoring - Troubleshooting connectivity 1. Load balancer and packet loss diagnosis 2. VPN/Interconnect issues, BGP errors
Topic 4: Configuring hybrid and multi-cloud connectivity	14%	- Cloud Router 1. BGP configuration, route advertisement - Cloud Interconnect 1. Dedicated, Partner Interconnect, VLAN attachments - Cloud VPN 1. Site-to-site, HA VPN, policy-based/route-based
Topic 5: Designing and planning a Google Cloud VPC network	26%	- Designing hybrid and multi-cloud networks 1. Cloud Interconnect / Cloud VPN architecture 2. Cloud Router and BGP design - Designing for GKE networking 1. Alias IP ranges, private control plane - Designing overall network architecture 1. Network tiers (Premium/Standard) 2. High availability, disaster recovery, scalability 3. DNS topology design - Designing VPC networks 1. Private Service Access / Private Service Connect 2. IP address management 3. Standalone vs Shared VPC 4. Subnet design and CIDR planning
Topic 6: Implementing a VPC network	20%	- VPC connectivity 1. Dynamic and static routing 2. VPC Peering, Shared VPC setup - Hierarchical firewalls and security policies 1. Cloud Next Generation Firewall - Network Connectivity Center 1. Spoke and hub configuration - Configuring VPC resources 1. Private Google Access, service accounts 2. Networks, subnets, firewall rules/policies

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Google Cloud Certified - Professional Cloud Network Engineer 認定 Professional-Cloud-Network-Engineer 試験問題 (Q141-Q146):

質問 # 141
You are planning a large application deployment in Google Cloud that includes on-premises connectivity. The application requires direct connectivity between workloads in all regions and on-premises locations without address translation, but all RFC 1918 ranges are already in use in the on-premises locations. What should you do?

A. Use overlapping RFC 1918 ranges with multiple isolated VPC networks.
B. Use overlapping RFC 1918 ranges with multiple isolated VPC networks and Cloud NAT.
C. Use multiple VPC networks with a transit network using VPC Network Peering.
D. Use non-RFC 1918 ranges with a single global VPC.

正解：D

質問 # 142
You create a Google Kubernetes Engine private cluster and want to use kubectl to get the status of the pods. In one of your instances you notice the master is not responding, even though the cluster is up and running.
What should you do to solve the problem?

A. Assign a public IP address to the instance.
B. Create a route to reach the Master, pointing to the default internet gateway.
C. Create the appropriate master authorized network entries to allow the instance to communicate to the master.
D. Create the appropriate firewall policy in the VPC to allow traffic from Master node IP address to the instance.

正解：D

質問 # 143
Your organization recently re-architected your cloud environment to use Network Connectivity Center. However, an error occurred when you tried to add a new VPC named vpc-dev as a spoke. The error indicated that there was an issue with an existing spoke and the IP space of a VPC named vpc-pre-prod. You must complete the migration quickly and efficiently. What should you do?

A. Exclude the conflicting IP range by using the --exclude-export-ranges flag in the hub when attaching the VPC spoke for vpc-dev.
B. Exclude the conflicting IP range by using the --exclude-export-ranges flag when creating the VPC spoke for vpc-dev.
C. Remove the conflicting VPC spoke for vpc-pre-prod from the set of VPC spokes in Network Connectivity Center. Add the VPC spoke for vpc-dev. Add the previously removed vpc-pre-prod as a VPC spoke.
D. Delete the VMs associated with the conflicting subnets, then delete the conflicting subnets in vpc-dev. Recreate the subnets with a new IP range and redeploy the previously deleted VMs in the new subnets. Add the VPC spoke for vpc-dev.

正解：C

解説：
The most efficient way to resolve the conflict is to temporarily remove the conflicting vpc-pre-prod spoke, add the vpc-dev spoke, and then re-add vpc-pre-prod. This ensures that the migration happens quickly without the need to change IP ranges or delete resources.

質問 # 144
You have enabled HTTP(S) load balancing for your application, and your application developers have reported that HTTP(S) requests are not being distributed correctly to your Compute Engine Virtual Machine instances. You want to find data about how the request are being distributed.
Which two methods can accomplish this? (Choose two.)

A. On the Load Balancer details page of the GCP Console, click on the Monitoring tab, select your backend service, and look at the graphs.
B. In Stackdriver Monitoring, create a new dashboard and track the https/backend_request_count metric for the load balancer.
C. In Stackdriver Monitoring, select Resources > Google Cloud Load Balancers and review the Key Metrics graphs in the dashboard.
D. In Stackdriver Monitoring, select Resources > Metrics Explorer and search for
https/request_bytes_count metric.
E. In Stackdriver Error Reporting, look for any unacknowledged errors for the Cloud Load Balancers service.

正解：A、B

解説：
Need "backend"_request_count for us to find data about how the request are being "distributed".
https://cloud.google.com/load-balancing/docs/https/https-logging-monitoring

質問 # 145
Your on-premises data center has 2 routers connected to your Google Cloud environment through a VPN on each router. All applications are working correctly; however, all of the traffic is passing across a single VPN instead of being load-balanced across the 2 connections as desired.
During troubleshooting you find:
- Each on-premises router is configured with a unique ASN. ?Each on-
premises router is configured with the same routes and priorities.
- Both on-premises routers are configured with a VPN connected to a
single Cloud Router.
- BGP sessions are established between both on-premises routers and the Cloud Router.
- Only 1 of the on-premises router's routes are being added to the
routing table.
What is the most likely cause of this problem?

A. The on-premises routers are configured with the same routes.
B. The ASNs being used on the on-premises routers are different.
C. You do not have a load balancer to load-balance the network traffic.
D. A firewall is blocking the traffic across the second VPN connection.

正解：C

質問 # 146
......

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