Google Professional Cloud Network Engineer 시험

Question No : 1

You have a web application that is currently hosted in the us-central1 region. Users experience high latency when traveling in Asia. You've configured a network load balancer, but users have not experienced a performance improvement. You want to decrease the latency.
What should you do?

• A.Configure a policy-based route rule to prioritize the traffic.
• B.Configure an HTTP load balancer, and direct the traffic to it.
• C.Configure Dynamic Routing for the subnet hosting the application.
• D.Configure the TTL for the DNS zone to decrease the time between updates.

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Explanation:
Reference: https://cloud.google.com/load-balancing/docs/tutorials/optimize-app-latency

Question No : 2

You have configured Cloud CDN using HTTP(S) load balancing as the origin for cacheable content. Compression is configured on the web servers, but responses served by Cloud CDN are not compressed.
What is the most likely cause of the problem?

• A.You have not configured compression in Cloud CD
• B.You have configured the web servers and Cloud CDN with different compression types.
• C.The web servers behind the load balancer are configured with different compression types.
• D.You have to configure the web servers to compress responses even if the request has a Via header.

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Explanation:
If responses served by Cloud CDN are not compressed but should be, check that the web server software running on your instances is configured to compress responses. By default, some web server software will automatically disable compression for requests that include a Via header. The presence of a Via header indicates the request was forwarded by a proxy. HTTP proxies such as HTTP(S) load balancing add a Via header to each request as required by the HTTP specification. To enable compression, you may have to override your web server's default configuration to tell it to compress responses even if the request had a Via header.
Reference: https://cloud.google.com/cdn/docs/troubleshooting-steps

Question No : 3

You have an application hosted on a Compute Engine virtual machine instance that cannot communicate with a resource outside of its subnet. When you review the flow and firewall logs, you do not see any denied traffic listed.
During troubleshooting you find:
- Flow logs are enabled for the VPC subnet, and all firewall rules are set to log.
- The subnetwork logs are not excluded from Stackdriver.
- The instance that is hosting the application can communicate outside the subnet.
- Other instances within the subnet can communicate outside the subnet.
- The external resource initiates communication.
What is the most likely cause of the missing log lines?

• A.The traffic is matching the expected ingress rule.
• B.The traffic is matching the expected egress rule.
• C.The traffic is not matching the expected ingress rule.
• D.The traffic is not matching the expected egress rule.

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Question No : 4

You are disabling DNSSEC for one of your Cloud DNS-managed zones. You removed the DS records from your zone file, waited for them to expire from the cache, and disabled DNSSEC for the zone. You receive reports that DNSSEC validating resolves are unable to resolve names in your zone.
What should you do?

• A.Update the TTL for the zone.
• B.Set the zone to the TRANSFER state.
• C.Disable DNSSEC at your domain registrar.
• D.Transfer ownership of the domain to a new registrar.

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정답:
Explanation:
Before disabling DNSSEC for a managed zone you want to use, you must deactivate DNSSEC at your domain registrar to ensure that DNSSEC-validating resolvers can still resolve names in the zone.
Reference: https://cloud.google.com/dns/docs/dnssec-config

Question No : 5

You are increasing your usage of Cloud VPN between on-premises and GCP, and you want to support more traffic than a single tunnel can handle. You want to increase the available bandwidth using Cloud VPN.
What should you do?

• A.Double the MTU on your on-premises VPN gateway from 1460 bytes to 2920 bytes.
• B.Create two VPN tunnels on the same Cloud VPN gateway that point to the same destination VPN gateway IP address.
• C.Add a second on-premises VPN gateway with a different public IP address. Create a second tunnel on the existing Cloud VPN gateway that forwards the same IP range, but points at the new on-premises gateway I
• D.Add a second Cloud VPN gateway in a different region than the existing VPN gateway. Create a new tunnel on the second Cloud VPN gateway that forwards the same IP range, but points to the existing on-premises VPN gateway IP address.

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Question No : 6

You want to set up two Cloud Routers so that one has an active Border Gateway Protocol (BGP) session, and the other one acts as a standby.
Which BGP attribute should you use on your on-premises router?

• A.AS-Path
• B.Community
• C.Local Preference
• D.Multi-exit Discriminator

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Explanation:
Reference: https://cloud.google.com/router/docs/concepts/overview

Question No : 7

You decide to set up Cloud NAT. After completing the configuration, you find that one of your instances is not using the Cloud NAT for outbound NAT.
What is the most likely cause of this problem?

• A.The instance has been configured with multiple interfaces.
• B.An external IP address has been configured on the instance.
• C.You have created static routes that use RFC1918 ranges.
• D.The instance is accessible by a load balancer external IP address.

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Explanation:
Reference: https://www.sovereignsolutionscorp.com/google-cloud-nat/

Question No : 8

Your company's web server administrator is migrating on-premises backend servers for an application to GCP. Libraries and configurations differ significantly across these backend servers. The migration to GCP will be lift-and-shift, and all requests to the servers will be served by a single network load balancer
frontend. You want to use a GCP-native solution when possible.
How should you deploy this service in GCP?

• A.Create a managed instance group from one of the images of the on-premises servers, and link this instance group to a target pool behind your load balancer.
• B.Create a target pool, add all backend instances to this target pool, and deploy the target pool behind your load balancer.
• C.Deploy a third-party virtual appliance as frontend to these servers that will accommodate the significant differences between these backend servers.
• D.Use GCP's ECMP capability to load-balance traffic to the backend servers by installing multiple equal-priority static routes to the backend servers.

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Explanation:
Reference: https://cloud.google.com/compute/docs/instance-groups/adding-an-instance-group-to-a-load­balancer

Question No : 9

Your company offers a popular gaming service. Your instances are deployed with private IP addresses, and external access is granted through a global load balancer. You believe you have identified a potential malicious actor, but aren't certain you have the correct client IP address. You want to identify this actor while minimizing disruption to your legitimate users.
What should you do?

• A.Create a Cloud Armor Policy rule that denies traffic and review necessary logs.
• B.Create a Cloud Armor Policy rule that denies traffic, enable preview mode, and review necessary logs.
• C.Create a VPC Firewall rule that denies traffic, enable logging and set enforcement to disabled, and review necessary logs.
• D.Create a VPC Firewall rule that denies traffic, enable logging and set enforcement to enabled, and review necessary logs.

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Question No : 10

You have ordered Dedicated Interconnect in the GCP Console and need to give the Letter of Authorization/ Connecting Facility Assignment (LOA-CFA) to your cross-connect provider to complete the physical connection.
Which two actions can accomplish this? (Choose two.)

• A.Open a Cloud Support ticket under the Cloud Interconnect category.
• B.Download the LOA-CFA from the Hybrid Connectivity section of the GCP Console.
• C.Run gcloud compute interconnects describe <interconnect>.
• D.Check the email for the account of the NOC contact that you specified during the ordering process.
• E.Contact your cross-connect provider and inform them that Google automatically sent the LOA/CFA to them via email, and to complete the connection.

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Question No : 11

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

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Question No : 12

Your company just completed the acquisition of Altostrat (a current GCP customer). Each company has a separate organization in GCP and has implemented a custom DNS solution. Each organization will retain its current domain and host names until after a full transition and architectural review is done in one year.
These are the assumptions for both GCP environments.
- Each organization has enabled full connectivity between all of its projects by using Shared VPC.
- Both organizations strictly use the 10.0.0.0/8 address space for their instances, except for bastion hosts (for accessing the instances) and load balancers for serving web traffic.
- There are no prefix overlaps between the two organizations.
- Both organizations already have firewall rules that allow all inbound and outbound traffic from the 10.0.0.0/8 address space.
- Neither organization has Interconnects to their on-premises environment.
You want to integrate networking and DNS infrastructure of both organizations as quickly as possible and with minimal downtime.
Which two steps should you take? (Choose two.)

• A.Provision Cloud Interconnect to connect both organizations together.
• B.Set up some variant of DNS forwarding and zone transfers in each organization.
• C.Connect VPCs in both organizations using Cloud VPN together with Cloud Router.
• D.Use Cloud DNS to create A records of all VMs and resources across all projects in both organizations.
• E.Create a third organization with a new host project, and attach all projects from your company and Altostrat to it using shared VP

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Question No : 13

You want to deploy a VPN Gateway to connect your on-premises network to GCP. You are using a non BGP-capable on-premises VPN device. You want to minimize downtime and operational overhead when your network grows. The device supports only IKEv2, and you want to follow Google-recommended practices.
What should you do?

• A.- Create a Cloud VPN instance. - Create a policy-based VPN tunnel per subnet. - Configure the appropriate local and remote traffic selectors to match your local and remote networks. - Create the appropriate static routes.
• B.• Create a Cloud VPN instance. - Create a policy-based VPN tunnel. - Configure the appropriate local and remote traffic selectors to match your local and remote networks. - Configure the appropriate static routes.
• C.- Create a Cloud VPN instance. - Create a route-based VPN tunnel. - Configure the appropriate local and remote traffic selectors to match your local and remote networks. - Configure the appropriate static routes.
• D.- Create a Cloud VPN instance. - Create a route-based VPN tunnel. - Configure the appropriate local and remote traffic selectors to 0.0.0.0/0. - Configure the appropriate static routes.

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Explanation:
Reference: https://cloud.google.com/vpn/docs/concepts/choosing-networks-routing

Question No : 14

You want to create a service in GCP using IPv6.
What should you do?

• A.Create the instance with the designated IPv6 address.
• B.Configure a TCP Proxy with the designated IPv6 address.
• C.Configure a global load balancer with the designated IPv6 address.
• D.Configure an internal load balancer with the designated IPv6 address.

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Question No : 15

You are trying to update firewall rules in a shared VPC for which you have been assigned only Network Admin permissions. You cannot modify the firewall rules. Your organization requires using the least privilege necessary.
Which level of permissions should you request?

• A.Security Admin privileges from the Shared VPC Admin.
• B.Service Project Admin privileges from the Shared VPC Admin.
• C.Shared VPC Admin privileges from the Organization Admin.
• D.Organization Admin privileges from the Organization Admin.

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Explanation:
Reference: https://cloud.google.com/vpc/docs/shared-vpc