View Full Google Professional Cloud Network Engineer Exam Dumps and Practice Test Dumps

 

Question 181

What does a VPC network’s MTU determine?

1. The number of available firewall rules
2. The maximum packet size supported on the network
3. The number of BGP sessions
4. The DNS cache duration

Correct Answer: 2

Explanation:

The Maximum Transmission Unit, or MTU, determines the largest packet size that can be transmitted without fragmentation at the network layer under the applicable configuration. Choosing an appropriate MTU is important because connected networks and workloads may have different packet-size requirements. MTU does not determine firewall-rule capacity, BGP session counts, or DNS cache duration. Engineers designing hybrid connectivity should consider whether the MTU values supported across connected environments are compatible. Incorrect assumptions about packet size can contribute to connectivity problems, fragmentation, or reduced application performance in certain network architectures.

Question 182

Which resource can associate a static external IP with a supported VM interface?

1. DNS forwarding zone
2. Cloud Router
3. External IP address reservation
4. VPC Flow Logs configuration

Correct Answer: 3

Explanation:

An external IP address reservation allows a specific external address to remain available for assignment to supported Google Cloud resources. This is useful when an application or service needs a stable public address rather than an address that may change when resources are recreated. DNS forwarding zones handle name resolution, Cloud Router manages dynamic routing, and VPC Flow Logs provide traffic visibility. Engineers should select the appropriate address scope and resource type when reserving an external IP. Stable public addressing can simplify DNS configuration, allowlisting, and integrations with external systems that expect a consistent source or destination address.

Question 183

What does an implied egress firewall rule generally permit?

1. Outbound traffic unless explicitly denied
2. All inbound traffic from the internet
3. Only traffic using UDP
4. Traffic that bypasses routing decisions

Correct Answer: 1

Explanation:

Google Cloud VPC networks have an implied rule that permits egress traffic unless another applicable firewall rule denies it. This provides a default outbound behavior while still allowing administrators to create explicit rules that restrict selected traffic. The implied rule does not mean that all inbound internet traffic is automatically permitted. It also does not restrict traffic to UDP or bypass routing decisions. Engineers should understand both implied ingress and egress behavior when troubleshooting firewall issues. Explicit rules can be added when organizations require tighter control over outbound destinations, protocols, ports, or target resources.

Question 184

Which Cloud Router feature lets administrators specify advertised prefixes manually?

1. Dynamic DNS configuration
2. NAT address management
3. Custom route advertisements
4. Packet mirroring

Correct Answer: 3

Explanation:

Cloud Router supports custom route advertisements that allow administrators to specify which supported prefixes should be advertised through BGP. This provides greater control over routing information sent to connected networks. Custom advertisements are useful when a hybrid architecture requires selective route visibility instead of relying exclusively on automatically advertised ranges. Dynamic DNS configuration, NAT address management, and packet mirroring perform unrelated functions. When configuring custom advertisements, engineers should carefully review the intended prefixes and understand how those advertisements affect routing decisions on the connected peer.

Question 185

What is the purpose of a VLAN attachment in Cloud Interconnect?

1. Store application firewall policies
2. Connect a VPC to an Interconnect connection
3. Provide DNS caching
4. Allocate Cloud NAT ports

Correct Answer: 2

Explanation:

A VLAN attachment provides a logical connection between a VPC network and a Cloud Interconnect connection. It is an important component in hybrid connectivity architectures because it associates the Google Cloud network with the Interconnect path. Cloud Router can then use BGP over the attachment to exchange routing information with the connected network. VLAN attachments do not store firewall policies, provide DNS caching, or allocate Cloud NAT ports. Engineers should plan VLAN attachments alongside Interconnect capacity, redundancy, routing requirements, and the VPC networks that need access to the hybrid connection.

Question 186

Which feature helps identify the network path between two endpoints?

1. Cloud CDN
2. Connectivity Tests
3. Cloud DNS
4. Cloud Armor

Correct Answer: 2

Explanation:

Connectivity Tests, available through Network Intelligence Center, helps analyze the expected network path between supported endpoints. It can evaluate relevant networking configuration and provide information that assists with identifying connectivity problems. This makes it useful for troubleshooting situations involving routes, firewall rules, forwarding configurations, and other network components. Cloud CDN focuses on content caching, Cloud DNS handles name resolution, and Cloud Armor provides application security controls. Connectivity Tests can therefore reduce the amount of manual investigation required when determining why traffic between two endpoints is not behaving as expected.

Question 187

What does a firewall target tag identify?

1. A DNS resolver
2. A BGP neighbor
3. VM instances to which a rule applies
4. A Cloud NAT address pool

Correct Answer: 3

Explanation:

A firewall target tag can identify VM instances to which a VPC firewall rule should apply. This allows administrators to associate traffic-control rules with specific groups of VM instances based on their network tags. The tag does not identify a DNS resolver, BGP neighbor, or NAT address pool. Targeting is an important part of firewall design because organizations often need different security policies for different application tiers. Engineers should ensure that the intended instances have the correct tags and that the rule’s source, protocol, port, direction, and priority conditions are also appropriate.

Question 188

Why can custom VPC networks simplify IP address planning?

1. They provide unlimited IP addresses automatically
2. They remove the need for subnet design
3. They allow overlapping ranges everywhere
4. They let administrators choose subnet ranges deliberately

Correct Answer: 4

Explanation:

Custom mode VPC networks allow administrators to define subnet ranges deliberately instead of relying on automatically created subnet ranges. This provides greater control over regional address allocation, network segmentation, and future expansion. Custom mode does not provide unlimited addresses, eliminate subnet planning, or make overlapping ranges safe. Careful CIDR planning remains necessary, especially when the VPC will connect to on-premises networks, other VPCs, or external environments. Engineers can use custom subnet ranges to align network design with organizational standards and anticipated workload growth.

Question 189

What does Cloud NAT logging help administrators observe?

1. DNS record ownership
2. NAT translation activity
3. BGP route preference
4. Load-balancer health status

Correct Answer: 2

Explanation:

Cloud NAT logging provides visibility into NAT-related activity for applicable connections. These logs can help administrators investigate outbound connectivity, identify translation behavior, and troubleshoot problems involving workloads that use Cloud NAT. DNS record ownership is handled by DNS configuration, BGP route preference is associated with routing, and load-balancer health status comes from health-check mechanisms. NAT logging can be especially useful when an application can reach some external destinations but experiences unexpected connection behavior elsewhere. Engineers should combine NAT logs with flow logs, firewall information, and application logs when performing detailed troubleshooting.

Question 190

Which Google Cloud service provides distributed DNS resolution for managed zones?

1. Cloud Armor
2. Cloud Router
3. Cloud DNS
4. Cloud NAT

Correct Answer: 3

Explanation:

Cloud DNS is Google’s managed DNS service for hosting and serving DNS information for supported zones. It provides authoritative DNS capabilities and can also support forwarding and other DNS architectures. Cloud Armor protects supported applications, Cloud Router manages dynamic routing, and Cloud NAT performs outbound address translation. Using a managed DNS service can reduce the operational burden of maintaining DNS infrastructure while integrating name resolution with Google Cloud networking. Engineers should select public or private DNS configurations according to whether names need to be resolved from external clients, internal workloads, or hybrid environments.

Question 191

What does a service project’s workload use from a Shared VPC host project?

1. Shared network resources
2. A separate public internet gateway
3. Independent Cloud Router hardware
4. Automatic DNS delegation

Correct Answer: 1

Explanation:

In a Shared VPC architecture, workloads in service projects can use network resources provided by the host project, subject to the required permissions and configuration. This allows network administration to remain centralized while application teams continue to manage workloads in their own projects. Service projects do not automatically receive separate physical networking infrastructure, public internet gateways, or DNS delegation merely because Shared VPC is enabled. Engineers should understand the distinction between host-project network administration and service-project workload ownership. IAM permissions are particularly important because users need appropriate authorization to deploy resources into shared subnets.

Question 192

Which route attribute can influence selection among routes with the same destination prefix?

1. Route priority
2. DNS TTL
3. NAT port number
4. Firewall log sampling

Correct Answer: 1

Explanation:

When applicable routes have the same destination prefix, route priority can influence which route is selected. This provides administrators with a mechanism for controlling preferred paths when multiple routes can reach the same destination. DNS TTL affects DNS caching, NAT port numbers relate to address translation, and firewall log sampling affects traffic logging. Engineers troubleshooting routing should examine destination specificity first and then consider applicable route priorities and route types. Understanding these selection factors helps explain why traffic may use one path instead of another in a complex Google Cloud environment.

Question 193

What is a key purpose of Cloud Armor adaptive protection?

1. Allocate additional subnet addresses
2. Establish private DNS forwarding
3. Detect and help mitigate certain application-layer attacks
4. Exchange BGP routes

Correct Answer: 3

Explanation:

Cloud Armor Adaptive Protection can help identify unusual application-layer traffic patterns and provide protection against certain attacks. It uses observed traffic behavior to assist with detecting potentially abusive or anomalous activity affecting supported applications. This capability is separate from subnet allocation, DNS forwarding, and BGP route exchange. Cloud Armor security controls should be considered as part of a broader application protection strategy that can include rate limiting, access controls, and other security mechanisms. Engineers should review generated recommendations and policies carefully before applying changes to production traffic.

Question 194

What does an internal load-balancer frontend typically provide?

1. A private IP endpoint for clients
2. A public DNS registrar
3. A BGP route reflector
4. A NAT translation table

Correct Answer: 1

Explanation:

An internal load-balancer frontend provides a private network endpoint that internal clients can use to reach backend services. This allows applications to distribute traffic without requiring clients to connect through a publicly exposed frontend. The exact behavior depends on the load-balancing architecture, but the fundamental purpose is private traffic entry. A public DNS registrar, BGP route reflector, and NAT translation table are unrelated resources. Engineers should consider the frontend address, subnet placement, client reachability, backend configuration, health checks, and firewall rules when deploying an internal load-balancing solution.

Question 195

Which mechanism can provide encrypted connectivity between Google Cloud and an external network over the internet?

1. Cloud CDN
2. Cloud DNS
3. Cloud VPN
4. Cloud NAT

Correct Answer: 3

Explanation:

Cloud VPN provides encrypted IPsec connectivity between Google Cloud and supported external networks using VPN tunnels. It is commonly used for hybrid connectivity when dedicated Interconnect connectivity is not required or when an encrypted tunnel is appropriate for the architecture. Cloud CDN provides content caching, Cloud DNS manages name resolution, and Cloud NAT performs address translation. Engineers should select the appropriate VPN architecture based on availability, routing, bandwidth, and peer-device requirements. HA VPN can provide higher availability through redundant tunnel configurations and dynamic routing can be used where supported.

Question 196

What should engineers verify when troubleshooting a blocked application connection?

1. Only the application’s DNS name
2. Routes, firewall rules, and endpoint configuration
3. Only the VM’s operating system version
4. Only the Cloud Console browser session

Correct Answer: 2

Explanation:

Troubleshooting a blocked connection requires examining multiple networking layers rather than focusing on a single component. Engineers should verify that the destination is reachable through the expected route, that applicable firewall rules allow the traffic, and that the relevant endpoint or load-balancer configuration is correct. DNS resolution and application settings may also need investigation depending on the symptom. Checking only the operating system version or browser session is insufficient for most network connectivity problems. A systematic approach using Connectivity Tests, flow logs, firewall logs, routes, and application diagnostics can significantly narrow down the cause.

Question 197

What does Private Google Access require at the subnet level?

1. An enabled subnet setting for Private Google Access
2. A dedicated BGP peer
3. A Cloud Armor policy
4. A public NAT gateway

Correct Answer: 1

Explanation:

Private Google Access is enabled through subnet-level configuration for eligible resources that need access to supported Google APIs and services without external IP addresses. The setting allows qualifying resources to use the appropriate Google-managed connectivity path. A dedicated BGP peer, Cloud Armor policy, or public NAT gateway is not what enables Private Google Access. Engineers should verify that the workload resides in the intended subnet and that the required service access and DNS configuration are available. Private Google Access should also be distinguished from general internet access through Cloud NAT.

Question 198

Which component can distribute traffic across multiple backend endpoints?

1. Cloud Router
2. Cloud DNS
3. Load balancer
4. Cloud NAT

Correct Answer: 3

Explanation:

A Google Cloud load balancer distributes incoming traffic across configured backend endpoints according to the behavior of the selected load-balancing service. This can improve application availability, scalability, and traffic distribution. Cloud Router handles dynamic route exchange, Cloud DNS provides name resolution, and Cloud NAT performs address translation. The load-balancing architecture determines how frontends, forwarding rules, health checks, backend services, and backend endpoints work together. Engineers should select the load-balancer type according to the application’s protocol, traffic direction, geographic requirements, and desired backend architecture.

Question 199

What is an important consideration when designing VPC subnet ranges?

1. Making every subnet use the same CIDR
2. Avoiding all regional subnet assignments
3. Leaving no space for future workloads
4. Preventing overlap with connected network ranges

Correct Answer: 4

Explanation:

Subnet ranges should be designed so that they do not conflict with address ranges used by connected networks that need to communicate. This is especially important for hybrid connectivity, VPC peering, and other architectures where routing relationships exist between separate networks. Using identical or overlapping CIDRs can create ambiguous destinations and connectivity limitations. Engineers should also reserve adequate address space for expected workload growth rather than allocating only the minimum immediately required. A documented IP address plan helps maintain consistency as additional regions, projects, services, and hybrid connections are introduced.

Question 200

What does BGP primarily exchange between connected routing peers?

1. DNS records
2. Network reachability information
3. Firewall policies
4. NAT session states

Correct Answer: 2

Explanation:

BGP primarily exchanges network reachability information between routing peers. In Google Cloud hybrid architectures, Cloud Router can use BGP to learn routes from connected networks and advertise appropriate Google Cloud prefixes to those peers. This enables dynamic routing rather than requiring every route to be configured manually. BGP does not exchange DNS records, firewall policies, or NAT session states. Engineers should understand which prefixes are advertised and learned and how route-selection behavior affects the resulting traffic path. Correct BGP configuration is essential for reliable hybrid connectivity across Interconnect and supported VPN architectures.