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Question 221

What does a Cloud DNS inbound forwarding policy provide?

1. A path for external DNS queries into a VPC resolver
2. Automatic subnet expansion
3. BGP route advertisement
4. NAT port allocation

Correct Answer: 1

Explanation:

A Cloud DNS inbound server policy can provide a DNS resolution path that allows authorized queries from external networks to reach Google Cloud DNS resolvers. This is particularly useful in hybrid environments where on-premises systems need to resolve private DNS names associated with Google Cloud resources. The feature is focused on DNS resolution rather than subnet management, BGP routing, or NAT. Engineers should ensure that the required network connectivity and forwarding configuration are available so external DNS clients can reach the appropriate resolver and obtain the expected private DNS responses.

Question 222

Which protocol does Cloud Router use for dynamic route exchange?

1. ICMP
2. BGP
3. HTTPS
4. DNS

Correct Answer: 2

Explanation:

Cloud Router uses Border Gateway Protocol, or BGP, to exchange routing information dynamically with compatible external peers. This allows Google Cloud and connected networks to learn reachable prefixes without requiring every route to be configured manually. BGP is commonly used with Cloud Interconnect and supported HA VPN architectures. ICMP is primarily used for network diagnostics, HTTPS supports secure application communication, and DNS resolves names. Engineers configuring Cloud Router should pay attention to peer addresses, autonomous system numbers, advertised routes, learned routes, and BGP session status.

Question 223

What is a Cloud DNS response policy used to control?

1. VPN tunnel encryption
2. NAT address translation
3. DNS responses for matching queries
4. Load-balancer backend capacity

Correct Answer: 3

Explanation:

A Cloud DNS response policy can influence the DNS response returned for queries that match defined conditions. This gives administrators a way to apply controlled DNS behavior without necessarily changing the underlying authoritative records in a zone. Response policies can be useful for organizational DNS requirements, testing scenarios, or controlled name-resolution behavior. They do not establish VPN encryption, perform NAT, or determine backend capacity. Engineers should carefully define matching rules and intended responses because DNS behavior directly affects how applications locate services and other resources.

Question 224

What is the function of a Cloud Router interface?

1. Store private DNS records
2. Provide a logical connection point for a BGP peer
3. Allocate external IP addresses
4. Perform application inspection

Correct Answer: 2

Explanation:

A Cloud Router interface represents a logical connection point associated with the networking path used for a BGP session. It forms part of the configuration that allows Cloud Router to establish dynamic routing with an external peer. The interface itself does not store DNS records, allocate public IP addresses, or perform application inspection. Engineers working with hybrid connectivity should verify that the interface configuration corresponds correctly with the associated VLAN attachment or VPN setup and that the BGP peer uses compatible parameters.

Question 225

Which load-balancing architecture forwards traffic directly toward backends instead of using an application proxy?

1. Passthrough load balancing
2. Proxy load balancing
3. DNS forwarding
4. Cloud NAT

Correct Answer: 1

Explanation:

Passthrough load balancing forwards traffic toward backend resources without using the same proxy-based processing model associated with proxy load balancers. This makes passthrough architectures appropriate for supported workloads where preserving connection characteristics or supporting particular protocols is important. Proxy load balancers process connections through proxy infrastructure, while DNS forwarding and Cloud NAT perform completely different functions. Engineers should choose between passthrough and proxy-based architectures according to protocol requirements, backend behavior, frontend accessibility, and the application’s networking needs.

Question 226

What does a Cloud DNS peering zone enable?

1. Automatic VPN tunnel creation
2. DNS resolution using another VPC’s DNS information
3. Dynamic firewall synchronization
4. Backend traffic distribution

Correct Answer: 2

Explanation:

A Cloud DNS peering zone enables DNS queries in one VPC network to use DNS information available from another VPC network through a configured DNS peering relationship. This can help organizations share private DNS information between selected network environments without duplicating all records. DNS peering is separate from VPN creation, firewall synchronization, and load balancing. Engineers should verify the participating networks and DNS configuration carefully so that the intended names resolve correctly while unrelated networks remain separated from private DNS information.

Question 227

What does a Cloud NAT address represent?

1. A BGP autonomous system identifier
2. A private subnet gateway
3. A public source address used for translated egress
4. A load-balancer health-check target

Correct Answer: 3

Explanation:

A Cloud NAT address is an external IP address that can be used as the translated source address for eligible outbound connections from private resources. This allows workloads without individual external IP addresses to reach supported external destinations. The NAT address does not identify a BGP autonomous system, act as a private subnet gateway, or represent a health-check target. Engineers should consider how many NAT addresses are configured and how much concurrent outbound traffic workloads generate because available translation capacity can affect high-volume applications.

Question 228

Which capability replicates selected network traffic for inspection?

1. Cloud DNS forwarding
2. Cloud Router
3. Packet Mirroring
4. Cloud CDN

Correct Answer: 3

Explanation:

Packet Mirroring replicates selected network traffic and sends the mirrored packets toward a configured collector or inspection solution. It can support security monitoring, troubleshooting, and specialized traffic analysis. Cloud DNS forwarding handles DNS requests, Cloud Router exchanges routes, and Cloud CDN caches eligible content. Engineers implementing Packet Mirroring should determine which traffic sources need to be mirrored and ensure that the collector architecture is properly configured. Because mirrored packets may contain application data, access to collected traffic should also be controlled appropriately.

Question 229

What does an internal Application Load Balancer provide?

1. Private application-layer traffic distribution
2. Public IP allocation for every backend
3. BGP route learning
4. DNS zone delegation

Correct Answer: 1

Explanation:

An internal Application Load Balancer provides application-layer traffic distribution through a private frontend. It is useful when applications need HTTP or HTTPS load balancing for clients that communicate through internal network connectivity rather than requiring a public frontend. The load balancer can distribute requests among suitable backend resources according to its configuration and health status. Public IP allocation, BGP route learning, and DNS delegation are separate networking functions. Engineers should evaluate frontend configuration, backend services, health checks, firewall rules, and client reachability when designing an internal application load-balancing solution.

Question 230

What does the ASN configured on Cloud Router identify?

1. The router’s BGP autonomous system
2. The subnet’s address range
3. The DNS zone’s visibility
4. The NAT port allocation

Correct Answer: 1

Explanation:

The autonomous system number, or ASN, identifies the autonomous system associated with a BGP router. Cloud Router uses an ASN as part of its BGP configuration when establishing dynamic routing relationships with external peers. The ASN does not define a subnet’s CIDR range, determine DNS visibility, or control NAT port allocation. Engineers should select and configure ASNs carefully, particularly in environments with multiple routing domains or several hybrid connections. Matching the intended BGP architecture is important for establishing successful routing sessions.

Question 231

Which policy mechanism supports centralized firewall controls across projects?

1. Cloud CDN policy
2. Hierarchical firewall policy
3. DNS response policy
4. NAT configuration

Correct Answer: 2

Explanation:

Hierarchical firewall policies allow organizations to apply firewall controls at higher levels of the Google Cloud resource hierarchy. Depending on placement and configuration, these policies can provide centralized security requirements across folders, projects, and associated VPC networks. This can simplify governance in environments where multiple teams manage separate workloads. Cloud CDN policies, DNS response policies, and NAT configurations serve different purposes. Engineers should understand inheritance, rule priority, targets, and the overall firewall evaluation model before deploying organization-wide or folder-level controls.

Question 232

What distinguishes a static route from a dynamically learned route?

1. Static routes require explicit administrative configuration
2. Static routes always use BGP
3. Static routes can only reach DNS servers
4. Static routes automatically change after every link failure

Correct Answer: 1

Explanation:

A static route is explicitly configured by an administrator, including its destination and applicable next-hop behavior. A dynamically learned route, by comparison, can be received through a routing protocol such as BGP. Static routes can be useful when the intended path is simple and stable, but they require administrative updates when network topology changes. They do not automatically use BGP or apply only to DNS servers. Engineers should consider operational requirements, failover behavior, and route-management overhead before deciding whether static or dynamic routing is appropriate.

Question 233

What does a Network Connectivity Center hub provide?

1. A centralized point for supported network connectivity
2. A replacement for all VPC firewalls
3. A managed public DNS registrar
4. A global NAT address pool

Correct Answer: 1

Explanation:

A Network Connectivity Center hub provides a centralized framework for connecting supported network resources through a hub-and-spoke architecture. It can simplify connectivity management when organizations need to connect multiple network environments through supported spoke types. The hub does not replace VPC firewall controls, operate as a public DNS registrar, or function as a global NAT address pool. Engineers should evaluate the supported spoke types, routing behavior, and connectivity requirements before selecting Network Connectivity Center as part of a broader network architecture.

Question 234

Why should firewall rules restrict ports when possible?

1. To reduce unnecessary permitted traffic
2. To increase DNS propagation speed
3. To expand subnet capacity
4. To create additional VPN tunnels

Correct Answer: 1

Explanation:

Restricting firewall rules to the ports and protocols actually required by an application reduces unnecessary network exposure. Instead of allowing broad traffic, engineers can permit only the communication needed by specific services or workloads. DNS propagation, subnet capacity, and VPN tunnel creation are unrelated to firewall port restrictions. A carefully designed rule should consider direction, source, target, protocol, port, and priority. Engineers should also verify that legitimate application traffic and required management or health-check connections remain permitted after tighter restrictions are introduced.

Question 235

Which NEG type is designed for supported serverless services?

1. Serverless NEG
2. Routing NEG
3. Firewall NEG
4. DNS NEG

Correct Answer: 1

Explanation:

A serverless Network Endpoint Group allows supported serverless services to participate as backends in appropriate Google Cloud load-balancing architectures. Instead of representing conventional VM network interfaces, the NEG identifies a serverless service or endpoint that can receive traffic. The other listed terms do not represent supported NEG categories for this purpose. Serverless NEGs can help organizations use common frontend and traffic-management capabilities while directing requests toward serverless applications. Engineers should verify service compatibility, load-balancer requirements, and the appropriate frontend and backend configuration.

Question 236

What does a DNS TTL primarily determine?

1. How long a DNS answer can remain cached
2. How many BGP sessions can exist
3. How many firewall rules can be created
4. How many addresses a subnet contains

Correct Answer: 1

Explanation:

A DNS time-to-live value indicates how long a DNS response can generally be retained in caches before it should be refreshed according to normal DNS behavior. TTL values therefore influence how quickly DNS changes become visible to clients and resolvers. TTL does not determine BGP session limits, firewall rule counts, or subnet capacity. Engineers should choose TTL values according to application requirements and operational expectations. Shorter values can help changes propagate sooner, while longer values can reduce repeated DNS queries for relatively stable records.

Question 237

What does a load-balancer health check evaluate?

1. Backend responsiveness according to configured criteria
2. VPC CIDR allocation
3. Cloud Router ASN ownership
4. DNSSEC key rotation

Correct Answer: 1

Explanation:

A load-balancer health check evaluates whether a backend responds according to configured health-check criteria. The load balancer can use this information when determining which backends are eligible to receive traffic. Health checks do not allocate VPC address space, determine Cloud Router ASN ownership, or rotate DNSSEC keys. Engineers should verify the selected protocol, port, request path when applicable, firewall access, and backend application response. A healthy application can still appear unhealthy if the health-check configuration does not match what the backend actually accepts.

Question 238

Which setting helps limit access to a private DNS zone?

1. Private-zone visibility configuration
2. Cloud NAT port allocation
3. BGP route advertisement
4. Interconnect capacity

Correct Answer: 1

Explanation:

Private DNS zone visibility determines which VPC networks can use a private zone for DNS resolution. By limiting visibility to selected networks, organizations can prevent unrelated environments from accessing private DNS information that they do not require. NAT port allocation, BGP route advertisement, and Interconnect capacity address different networking functions. Engineers managing multiple projects or environments should define DNS visibility deliberately, especially when production and non-production networks use separate private naming structures.

Question 239

What is a primary benefit of Cloud CDN caching?

1. Moving eligible cached content closer to users
2. Creating dynamic BGP sessions
3. Assigning subnet addresses
4. Establishing encrypted VPN tunnels

Correct Answer: 1

Explanation:

Cloud CDN can cache eligible content at distributed edge locations, allowing subsequent users to retrieve cached responses from locations closer to them. This can reduce latency and decrease repeated requests to origin backends for cacheable content. Cloud CDN does not create BGP sessions, allocate subnet addresses, or establish VPN tunnels. Engineers should review cache-control behavior, content characteristics, origin configuration, and application requirements when determining whether CDN caching will provide useful performance benefits.

Question 240

Which IP planning practice supports future network expansion?

1. Reserving address space for expected growth
2. Assigning overlapping ranges to connected networks
3. Consuming every available address immediately
4. Avoiding an IP allocation record

Correct Answer: 1

Explanation:

Reserving address space for future growth allows a network to accommodate additional workloads without requiring disruptive renumbering. Engineers should estimate expected workload expansion and allocate subnet ranges with sufficient capacity while avoiding overlap with connected environments. Consuming every available address immediately can make future expansion difficult, while overlapping ranges can create routing conflicts. Maintaining an accurate IP allocation record is also important because it provides visibility into existing and reserved ranges. A structured IP addressing strategy should consider current workloads, future regions, hybrid connectivity, and organizational standards.