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Question 261

What does Cloud DNS DNSSEC primarily provide?

1. BGP route selection
2. NAT port allocation
3. Load-balancer health monitoring
4. Authenticity protection for DNS responses

Correct Answer: 4

Explanation:

DNSSEC adds cryptographic validation to DNS responses, helping resolvers verify that DNS information has not been modified in transit and that the response originates from an authorized source. This strengthens DNS integrity and can help protect against certain forms of DNS manipulation. DNSSEC does not control BGP routing, NAT ports, or load-balancer health. Engineers implementing DNSSEC should understand the relationship between signing configuration, key management, and the DNS hierarchy. Proper planning is important because incorrect DNSSEC configuration can affect successful name resolution.

Question 262

What does a custom learned route allow Cloud Router to do?

1. Learn administrator-defined prefixes from a BGP configuration
2. Replace all firewall rules
3. Create public DNS records
4. Allocate additional NAT addresses

Correct Answer: 1

Explanation:

Custom learned routes allow administrators to configure prefixes that Cloud Router should consider as learned routes in supported routing scenarios. This can provide additional control over routing information used within a hybrid architecture. Firewall policies, public DNS records, and NAT addresses serve different networking functions. Engineers should understand how custom learned routes interact with routes received from peers and how route selection affects the resulting traffic path. Careful route planning helps avoid unintended routing behavior and ensures that connected networks receive and use the expected reachability information.

Question 263

Which Cloud DNS configuration determines which VPCs can use a private zone?

1. DNSSEC policy
2. Zone visibility
3. Cache duration
4. Record weighting

Correct Answer: 2

Explanation:

Private Cloud DNS zones include visibility configuration that determines which VPC networks can use the zone for private name resolution. This allows organizations to limit internal DNS information to selected environments and supports separation between different network segments. DNSSEC provides response authenticity, TTL controls caching duration, and routing policies can influence DNS answers. Engineers should define private-zone visibility carefully when operating multiple projects, environments, or Shared VPC configurations. Correct visibility ensures that workloads can resolve the names they require without unnecessarily exposing private DNS information to unrelated networks.

Question 264

What does Cloud NAT primarily change for an outbound connection?

1. The destination DNS record
2. The VPC subnet CIDR
3. The source address used outside the VPC
4. The backend health state

Correct Answer: 3

Explanation:

Cloud NAT translates the source information of eligible outbound connections so private resources can communicate with external destinations without requiring individual external IP addresses. The translated connection can use configured Cloud NAT external addresses and ports. Cloud NAT does not modify subnet CIDR ranges, DNS records, or load-balancer backend health states. Engineers should understand which subnets and IP ranges are covered by the NAT configuration and ensure that routing and firewall rules permit the intended traffic. NAT capacity should also be considered for workloads with high outbound connection counts.

Question 265

Which load-balancer component determines backend eligibility through active probing?

1. Health check
2. Forwarding rule
3. DNS record
4. Route advertisement

Correct Answer: 1

Explanation:

A load-balancer health check actively probes backend resources to determine whether they are responding according to configured criteria. Health information can influence whether the load balancer considers a backend eligible to receive traffic. A forwarding rule identifies the frontend traffic target, DNS records provide name resolution, and route advertisements provide network reachability information. Engineers should ensure that health-check protocol, port, request path where applicable, and firewall permissions are consistent with the backend application. Incorrect health-check settings can cause an otherwise functional backend to be marked unhealthy.

Question 266

Why would an engineer use a DNS forwarding zone?

1. To allocate additional VM addresses
2. To send matching DNS queries to specified resolvers
3. To exchange BGP routes
4. To create VPN tunnels

Correct Answer: 2

Explanation:

A DNS forwarding zone directs matching DNS queries to designated forwarding targets. This is useful when workloads need to resolve names maintained by external DNS infrastructure, such as an organization’s on-premises DNS servers. Forwarding zones provide a controlled bridge between DNS environments without requiring every external record to be recreated in Cloud DNS. IP allocation, BGP exchange, and VPN tunnel creation are separate functions. Engineers should verify that forwarding targets are reachable and that DNS traffic is allowed across the required network path.

Question 267

What can Network Connectivity Center spokes represent?

1. Supported network connectivity resources
2. DNS cache entries
3. Firewall log records
4. NAT port mappings

Correct Answer: 1

Explanation:

Network Connectivity Center uses spokes to represent supported network resources or connectivity constructs that participate in the hub-and-spoke architecture. This allows administrators to organize and manage connectivity through a central hub. DNS cache entries, firewall logs, and NAT port mappings are not the purpose of NCC spokes. Engineers should verify that the intended resource type is supported and understand how routes propagate between the hub and connected spokes. Proper spoke planning becomes increasingly important as an organization connects multiple networks or hybrid environments.

Question 268

What is the main function of a route’s destination range?

1. Define the packets that match the route
2. Identify the DNS resolver
3. Select the firewall logging interval
4. Reserve a NAT address

Correct Answer: 1

Explanation:

The destination range of a route specifies which packet destinations match that route. When a packet’s destination address falls within the route’s applicable range, the routing system can consider that route for forwarding. DNS resolver selection, firewall logging intervals, and NAT address reservation are unrelated functions. Engineers troubleshooting routing should examine destination ranges carefully because overlapping or competing routes can influence which path is selected. Understanding destination specificity is fundamental when diagnosing unexpected traffic paths in complex VPC and hybrid network architectures.

Question 269

Which feature can help control access to a published Private Service Connect service?

1. Cloud CDN policy
2. Consumer acceptance configuration
3. DNS TTL
4. NAT port reservation

Correct Answer: 2

Explanation:

Private Service Connect published services can use consumer acceptance controls to determine which consumers are permitted to connect. This allows service producers to establish controlled access rather than making a published service universally available to every potential consumer. CDN policies, DNS TTL values, and NAT port reservations serve different purposes. Engineers publishing a service should define the intended consumer projects or networks and configure the service attachment accordingly. Access control should be reviewed together with endpoint configuration and DNS so authorized consumers can reach the service reliably.

Question 270

What does an external static IP reservation provide?

1. A stable external address for supported resources
2. A private DNS forwarding target
3. A BGP peer ASN
4. A subnet secondary range

Correct Answer: 1

Explanation:

An external static IP reservation provides a stable external IP address that can be assigned to supported Google Cloud resources. Reserving an address can be useful when external systems require a predictable destination or source address. The reservation itself does not create a DNS forwarding target, BGP ASN, or secondary subnet range. Engineers should select the correct IP scope and ensure that the reserved address is assigned to the intended resource. Stable addresses can simplify allowlisting, DNS configuration, and integrations with external systems.

Question 271

Which Cloud Router capability allows administrators to control advertised prefixes?

1. Custom route advertisements
2. DNS response policies
3. NAT logging
4. Health-check configuration

Correct Answer: 1

Explanation:

Cloud Router custom route advertisements allow administrators to control which selected prefixes are advertised to connected BGP peers. This is useful when external networks should receive only specific Google Cloud routes rather than a broader automatically generated set. DNS response policies, NAT logging, and health checks serve unrelated purposes. Engineers should carefully identify the prefixes that connected networks actually need and validate the resulting route exchange. Over-advertising can expose unnecessary reachability, while missing prefixes can prevent external systems from reaching required Google Cloud resources.

Question 272

What does VPC firewall logging help reveal?

1. DNS record expiration
2. Whether matching traffic was allowed or denied
3. BGP key material
4. NAT address ownership

Correct Answer: 2

Explanation:

VPC firewall logging can provide visibility into traffic that matches configured firewall rules and can help engineers understand whether relevant traffic was allowed or denied. This is useful when troubleshooting connectivity and validating security-policy behavior. Firewall logs do not reveal DNS expiration, BGP private key material, or NAT address ownership. Engineers should use firewall logs alongside flow logs and Connectivity Tests when investigating network-access problems. Careful interpretation is important because the logged information depends on the configured firewall rule and logging settings.

Question 273

What is the purpose of an IPv6 subnet range?

1. Provide IPv6 address space to supported resources
2. Establish a DNS forwarding relationship
3. Define a BGP authentication key
4. Configure Cloud NAT ports

Correct Answer: 1

Explanation:

An IPv6 subnet range provides IPv6 address space for supported resources and workloads. IPv6 planning allows organizations to use the newer addressing protocol alongside or instead of IPv4 where supported. DNS forwarding, BGP authentication, and NAT port configuration are separate networking concerns. Engineers designing IPv6 networks should consider address allocation, routing, firewall behavior, dual-stack requirements, and compatibility with connected systems. They should also verify that all required Google Cloud services and external network components support the intended IPv6 architecture.

Question 274

Which service can visualize network performance between supported resources?

1. Cloud NAT
2. Performance Dashboard
3. Cloud DNS
4. Private Service Connect

Correct Answer: 2

Explanation:

Network Intelligence Center’s Performance Dashboard provides visibility into network performance characteristics between supported resources and network paths. It can help engineers identify performance patterns and investigate potential latency or packet-loss issues. Cloud NAT, Cloud DNS, and Private Service Connect provide different networking capabilities and do not serve as the primary performance visualization function. Engineers can combine performance information with Connectivity Tests, flow logs, and application metrics to build a more complete understanding of network behavior.

Question 275

What is a key reason to use separate subnets for network segmentation?

1. To organize workloads into distinct network boundaries
2. To eliminate all firewall rules
3. To guarantee unlimited IP capacity
4. To disable route propagation

Correct Answer: 1

Explanation:

Separate subnets can help organize workloads into distinct network segments based on environment, application role, region, or other architectural requirements. Segmentation can make routing, firewall targeting, address management, and operational administration easier to structure. Subnets do not eliminate firewall requirements, provide unlimited address capacity, or automatically disable route propagation. Engineers should combine subnet design with appropriate firewall policies and routing controls to achieve the intended security and connectivity boundaries.

Question 276

Which mechanism can provide private access to supported Google APIs without a VM external IP?

1. Cloud CDN
2. Private Google Access
3. Cloud Router
4. Cloud Armor

Correct Answer: 2

Explanation:

Private Google Access enables eligible resources without external IP addresses to access supported Google APIs and services through Google’s private network connectivity. This is useful when workloads need Google-managed services while maintaining private addressing. Cloud CDN handles content caching, Cloud Router manages dynamic routing, and Cloud Armor provides application security controls. Engineers should enable Private Google Access appropriately at the subnet level and verify DNS and routing behavior for the required Google services.

Question 277

What does a service attachment represent in Private Service Connect?

1. The producer-side published service configuration
2. A consumer’s DNS cache
3. A Cloud Router BGP session
4. A NAT port range

Correct Answer: 1

Explanation:

A Private Service Connect service attachment represents the producer-side configuration used to publish a supported service to consumers. It provides the connection mechanism through which authorized consumers can access the service privately. A consumer endpoint is a separate concept, while DNS caching, BGP sessions, and NAT port ranges serve unrelated purposes. Engineers publishing services should configure the service attachment carefully, including consumer acceptance controls and backend connectivity. Correct producer-side configuration is essential for reliable Private Service Connect service consumption.

Question 278

Which condition can cause a route to be rejected during network design?

1. The route uses a supported next hop
2. The destination overlaps inappropriately with another network range
3. The route has a documented purpose
4. The destination is properly summarized

Correct Answer: 2

Explanation:

Incompatible or overlapping address ranges can create routing conflicts when networks need to communicate. Before establishing connectivity between VPCs, hybrid networks, or other environments, engineers should verify that destination ranges are compatible with existing address allocations. A supported next hop, documented purpose, and appropriate route summarization are not inherently problematic. Careful CIDR planning should occur before connectivity is established because renumbering networks later can be operationally difficult and disruptive.

Question 279

What does Cloud CDN primarily reduce for cacheable content?

1. Repeated requests reaching the origin
2. Number of Cloud Router peers
3. Number of VPC subnets
4. Size of DNS zones

Correct Answer: 1

Explanation:

Cloud CDN can reduce repeated requests reaching an origin backend by serving eligible cached content from Google’s edge infrastructure. This can lower origin load and improve response performance for users who can access cached content from nearby edge locations. Cloud CDN does not reduce the number of Cloud Router peers, VPC subnets, or DNS zone size. Engineers should understand cache-control behavior and content eligibility when evaluating CDN benefits. Dynamic or highly personalized content may require different caching considerations than static or otherwise cacheable responses.

Question 280

What should engineers examine when a private VM cannot reach an external service?

1. Only the VM hostname
2. Only the DNS TTL
3. Routing, firewall rules, and NAT configuration
4. Only the VM disk type

Correct Answer: 3

Explanation:

When a private VM cannot reach an external service, engineers should inspect the complete outbound connectivity path. This includes verifying the route toward the destination, applicable firewall rules, and whether Cloud NAT or another appropriate egress mechanism is configured for the workload. DNS resolution may also need investigation if the application uses a hostname. Checking only the VM hostname or disk type will not explain most network-level failures. A systematic troubleshooting process can combine Connectivity Tests, flow logs, firewall logs, NAT information, and application diagnostics to identify the actual failure point.