Question 70
A network operations team wants an alarm when a Direct Connect connection becomes unavailable. What telemetry should be monitored?
- Record application-path latency and loss measurements together with network metrics before changes
- Enable Amazon CloudFront access logging
- Create a CloudWatch alarm for Direct Connect ConnectionState
- Enable VPC Flow Logs for the relevant subnet or network interfaces
Explanation
Correct Answer
C:ConnectionState communicates physical/logical connection availability and allows actionable alerting on link state changes.
Incorrect Answers
A:Representative baseline measurements are necessary to attribute later performance changes rather than relying only on a post-change snapshot; that addresses defensible before-and-after network performance comparisons, rather than automated alerting on Direct Connect connectivity state.
B:CloudFront request logs document delivered CDN requests and response details rather than internal VPC flow metadata; this belongs to edge HTTP request accounting, while the problem is automated alerting on Direct Connect connectivity state.
D:In the metadata-level accept and reject visibility workflow, flow Logs record network-flow metadata and actions for monitored resources, not full application payload bytes; the current case needs automated alerting on Direct Connect connectivity state.
Question 71
An AWS organization wants searchable multi-VPC traffic history in one query interface. What design helps?
- Correlate VPC Flow Logs with application or load-balancer access logs
- Centralize VPC Flow Logs in a supported destination and query aggregated records
- Create a CloudWatch alarm for Direct Connect ConnectionState
- Enable VPC Flow Logs for the relevant subnet or network interfaces
Explanation
Correct Answer
B:Collecting flow logs consistently across VPCs provides evidence for analysis of communication patterns without deploying packet sensors on every host.
Incorrect Answers
A:Flow metadata addresses connectivity while HTTP access records reveal application responses, allowing the two failure layers to be separated; that addresses correlation of transport connectivity with application-layer denial, rather than consolidated searchable network flow history.
C:ConnectionState communicates physical/logical connection availability and allows actionable alerting on link state changes; this changes automated alerting on Direct Connect connectivity state, not the necessary consolidated searchable network flow history.
D:In the metadata-level accept and reject visibility workflow, flow Logs record network-flow metadata and actions for monitored resources, not full application payload bytes; the current case needs consolidated searchable network flow history.
Question 72
A new network build must establish a reliable pre-change latency baseline for later comparison. What should the team collect?
- Enable VPC Flow Logs for the relevant subnet or network interfaces
- Create a CloudWatch alarm for Direct Connect ConnectionState
- Correlate VPC Flow Logs with application or load-balancer access logs
- Record application-path latency and loss measurements together with network metrics before changes
- Use Network Manager route analysis or appropriate transit gateway route-table inspection
Explanation
Correct Answer
D:Representative baseline measurements are necessary to attribute later performance changes rather than relying only on a post-change snapshot.
Incorrect Answers
A:Flow Logs record network-flow metadata and actions for monitored resources, not full application payload bytes; that addresses metadata-level accept and reject visibility, rather than network flow metadata and ALB HTTP request logs.
B:ConnectionState communicates physical/logical connection availability and allows actionable alerting on link state changes; this belongs to automated alerting on Direct Connect connectivity state, while the problem is network flow metadata and ALB HTTP request logs.
C:Flow metadata addresses connectivity while HTTP access records reveal application responses, allowing the two failure layers to be separated; this changes correlation of transport connectivity with application-layer denial, not the necessary network flow metadata and ALB HTTP request logs.
E:This produces interpretation of routed paths through transit connectivity: Route and attachment inspection reveals how a destination is selected, which CloudWatch utilization metrics alone cannot explain; the stem instead tests network flow metadata and ALB HTTP request logs.
Question 73
An HTTP outage investigation must reveal both the transport ACCEPT/REJECT outcome and the precise ALB request response codes. Which TWO logging sources should engineers collect? Choose TWO.
- Run VPC Reachability Analyzer for the source and destination path
- Create a CloudWatch alarm for Direct Connect ConnectionState
- Enable VPC Flow Logs for the relevant subnet or network interfaces
- Use AWS Network Manager to visualize and monitor the global network topology
- Enable Application Load Balancer access logs to an S3 bucket
Explanation
Correct Answers
C:Flow Logs record network-flow metadata and actions for monitored resources, not full application payload bytes; this covers the metadata-level accept and reject visibility component of the combined scenario.
E:ALB access records contain request-level fields, target information, and response codes for HTTP investigation; this covers the per-request ALB request and target telemetry component of the combined scenario.
Incorrect Answers
A:Reachability Analyzer performs static configuration analysis to explain an allowable path or blocking network component; that addresses model-based reachability verification, rather than interpretation of routed paths through transit connectivity.
B:ConnectionState communicates physical/logical connection availability and allows actionable alerting on link state changes; this belongs to automated alerting on Direct Connect connectivity state, while the problem is interpretation of routed paths through transit connectivity.
D:In the cross-network topology and connectivity event inventory workflow, network Manager brings transit gateway and hybrid connectivity topology and event visibility into a centralized networking view; the current case needs interpretation of routed paths through transit connectivity.
Question 74
A support engineer needs to distinguish network-level packet drops from an application returning HTTP 403 to a caller. Which monitoring combination is appropriate?
- Enable Amazon CloudFront access logging
- Enable VPC Flow Logs for the relevant subnet or network interfaces
- Centralize VPC Flow Logs in a supported destination and query aggregated records
- Correlate VPC Flow Logs with application or load-balancer access logs
Explanation
Correct Answer
D:Flow metadata addresses connectivity while HTTP access records reveal application responses, allowing the two failure layers to be separated.
Incorrect Answers
A:CloudFront request logs document delivered CDN requests and response details rather than internal VPC flow metadata; that addresses edge HTTP request accounting, rather than correlation of transport connectivity with application-layer denial.
B:Flow Logs record network-flow metadata and actions for monitored resources, not full application payload bytes; this belongs to metadata-level accept and reject visibility, while the problem is correlation of transport connectivity with application-layer denial.
C:Collecting flow logs consistently across VPCs provides evidence for analysis of communication patterns without deploying packet sensors on every host; this changes consolidated searchable network flow history, not the necessary correlation of transport connectivity with application-layer denial.
Question 75
Two data centers need resilient dedicated access to AWS without sharing a single Direct Connect facility failure domain. What architecture should be proposed?
- Deploy AWS Site-to-Site VPN over existing Internet connectivity
- Provide the Direct Connect Letter of Authorization and Connecting Facility Assignment
- Establish Direct Connect connections at separate Direct Connect locations with redundant customer paths
- Keep Site-to-Site VPN as a backup path with routing preferences controlling failover
Explanation
Correct Answer
C:Geographic and facility diversity protects against a single colocation or circuit fault that redundant VLANs on one port cannot survive.
Incorrect Answers
A:IPsec tunnels can establish encrypted AWS connectivity without waiting for Direct Connect cross-connect provisioning; that addresses fast establishment of encrypted hybrid connectivity, rather than physical redundancy across interconnect facilities.
B:The LOA-CFA identifies the approved circuit termination and facility details needed for the physical cross-connect; this belongs to physical cross-connect authorization at the interconnect facility, while the problem is physical redundancy across interconnect facilities.
D:In the heterogeneous backup path for circuit outages workflow, an independent IPsec tunnel over the Internet provides a separate transport failure domain when the dedicated circuit becomes unavailable; the current case needs physical redundancy across interconnect facilities.
Question 76
A branch office needs secure hybrid access immediately while a dedicated circuit takes several weeks to provision. What should be used initially?
- Keep Site-to-Site VPN as a backup path with routing preferences controlling failover
- Run Site-to-Site VPN over Direct Connect using a supported public or private IP transport design
- Deploy AWS Site-to-Site VPN over existing Internet connectivity
- Create a private virtual interface toward the VPC's virtual private gateway or Direct Connect gateway
Explanation
Correct Answer
C:IPsec tunnels can establish encrypted AWS connectivity without waiting for Direct Connect cross-connect provisioning.
Incorrect Answers
A:An independent IPsec tunnel over the Internet provides a separate transport failure domain when the dedicated circuit becomes unavailable; that addresses heterogeneous backup path for circuit outages, rather than fast establishment of encrypted hybrid connectivity.
B:Direct Connect provides dedicated transport, while the layered VPN supplies IPsec encryption absent from ordinary VIF forwarding; this belongs to encrypted hybrid traffic on dedicated transport, while the problem is fast establishment of encrypted hybrid connectivity.
D:In the private-IP hybrid routing to a VPC workflow, A private VIF exchanges private network routes for VPC connectivity instead of exposing the public AWS service address space; the current case needs fast establishment of encrypted hybrid connectivity.
Question 77
An enterprise has many VPCs attached to a regional transit gateway and wants one Direct Connect BGP attachment for access to the hub. Which virtual interface belongs in the design?
- Configure a Direct Connect public virtual interface
- Share a central transit gateway through AWS Resource Access Manager
- Use a transit virtual interface to a Direct Connect gateway associated with the transit gateway
- Build an AWS Transit Gateway Connect attachment with GRE and BGP peers
Explanation
Correct Answer
C:Transit VIFs connect on-premises routers to transit gateways through Direct Connect gateways, reducing per-VPC VIF sprawl.
Incorrect Answers
A:A public VIF establishes BGP reachability for supported AWS public endpoints over the dedicated connection without turning them into private IP resources; that addresses AWS public service routing over Direct Connect, rather than Direct Connect transit access to many routed VPCs.
B:RAM lets separate accounts create and use approved attachments to a centrally managed transit gateway while retaining account boundaries; this belongs to cross-account consumption of shared transit routing, while the problem is Direct Connect transit access to many routed VPCs.
D:In the dynamic GRE overlay integration with transit routing workflow, transit Gateway Connect provides GRE overlay connectivity and BGP route exchange for supported SD-WAN and virtual router appliances; the current case needs Direct Connect transit access to many routed VPCs.
Question 78
A company connects to a single VPC using a dedicated circuit and needs private addressing for EC2 instances. Which virtual interface is appropriate?
- Create a private virtual interface toward the VPC's virtual private gateway or Direct Connect gateway
- Do not treat individual virtual private gateways as a transitive branch routing hub
- Establish Direct Connect connections at separate Direct Connect locations with redundant customer paths
- Use AWS Site-to-Site VPN private IP VPN over Direct Connect with Transit Gateway
- Deploy AWS Site-to-Site VPN over existing Internet connectivity
Explanation
Correct Answer
A:A private VIF exchanges private network routes for VPC connectivity instead of exposing the public AWS service address space.
Incorrect Answers
B:A VGW provides VPC edge connectivity, whereas branch-to-branch transit requires a supported hub service or an appropriately designed VPN topology; this belongs to branch-to-branch transit beyond isolated VPC edge gateways, while the problem is private-IP hybrid routing to a VPC.
C:Geographic and facility diversity protects against a single colocation or circuit fault that redundant VLANs on one port cannot survive; this changes physical redundancy across interconnect facilities, not the necessary private-IP hybrid routing to a VPC.
D:In the private-addressed IPsec encryption on dedicated hybrid links workflow, private IP VPN can run IPsec tunnels on a Direct Connect path using private endpoint addresses and centralized transit routing; the current case needs private-IP hybrid routing to a VPC.
E:This produces fast establishment of encrypted hybrid connectivity: IPsec tunnels can establish encrypted AWS connectivity without waiting for Direct Connect cross-connect provisioning; the stem instead tests private-IP hybrid routing to a VPC.
Question 79
A data center needs private-line access to publicly addressed AWS services such as a regional public API. What virtual interface should be created?
- Run Site-to-Site VPN over Direct Connect using a supported public or private IP transport design
- Use a transit virtual interface to a Direct Connect gateway associated with the transit gateway
- Configure a Direct Connect public virtual interface
- Confirm the configured 802.1Q VLAN tag matches the Direct Connect virtual interface
Explanation
Correct Answer
C:A public VIF establishes BGP reachability for supported AWS public endpoints over the dedicated connection without turning them into private IP resources.
Incorrect Answers
A:Direct Connect provides dedicated transport, while the layered VPN supplies IPsec encryption absent from ordinary VIF forwarding; that addresses encrypted hybrid traffic on dedicated transport, rather than AWS public service routing over Direct Connect.
B:Transit VIFs connect on-premises routers to transit gateways through Direct Connect gateways, reducing per-VPC VIF sprawl; this belongs to Direct Connect transit access to many routed VPCs, while the problem is AWS public service routing over Direct Connect.
D:In the correct VLAN encapsulation for hybrid BGP sessions workflow, the VIF's VLAN is the layer-two demultiplexing identity, so an incorrect tag prevents expected frames from reaching the BGP peer; the current case needs AWS public service routing over Direct Connect.
Question 80
A regulated application requires IPsec encryption while still using the predictable path of Direct Connect. What hybrid pattern fits?
- Run Site-to-Site VPN over Direct Connect using a supported public or private IP transport design
- Configure a Direct Connect public virtual interface
- Deploy AWS Site-to-Site VPN over existing Internet connectivity
- Keep Site-to-Site VPN as a backup path with routing preferences controlling failover
Explanation
Correct Answer
A:Direct Connect provides dedicated transport, while the layered VPN supplies IPsec encryption absent from ordinary VIF forwarding.
Incorrect Answers
B:A public VIF establishes BGP reachability for supported AWS public endpoints over the dedicated connection without turning them into private IP resources; this belongs to AWS public service routing over Direct Connect, while the problem is encrypted hybrid traffic on dedicated transport.
C:IPsec tunnels can establish encrypted AWS connectivity without waiting for Direct Connect cross-connect provisioning; this changes fast establishment of encrypted hybrid connectivity, not the necessary encrypted hybrid traffic on dedicated transport.
D:In the heterogeneous backup path for circuit outages workflow, an independent IPsec tunnel over the Internet provides a separate transport failure domain when the dedicated circuit becomes unavailable; the current case needs encrypted hybrid traffic on dedicated transport.