Question 70

A network operations team wants an alarm when a Direct Connect connection becomes unavailable. What telemetry should be monitored?

  1. Record application-path latency and loss measurements together with network metrics before changes
  2. Enable Amazon CloudFront access logging
  3. Create a CloudWatch alarm for Direct Connect ConnectionState
  4. 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?

  1. Correlate VPC Flow Logs with application or load-balancer access logs
  2. Centralize VPC Flow Logs in a supported destination and query aggregated records
  3. Create a CloudWatch alarm for Direct Connect ConnectionState
  4. 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?

  1. Enable VPC Flow Logs for the relevant subnet or network interfaces
  2. Create a CloudWatch alarm for Direct Connect ConnectionState
  3. Correlate VPC Flow Logs with application or load-balancer access logs
  4. Record application-path latency and loss measurements together with network metrics before changes
  5. 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.

  1. Run VPC Reachability Analyzer for the source and destination path
  2. Create a CloudWatch alarm for Direct Connect ConnectionState
  3. Enable VPC Flow Logs for the relevant subnet or network interfaces
  4. Use AWS Network Manager to visualize and monitor the global network topology
  5. 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?

  1. Enable Amazon CloudFront access logging
  2. Enable VPC Flow Logs for the relevant subnet or network interfaces
  3. Centralize VPC Flow Logs in a supported destination and query aggregated records
  4. 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?

  1. Deploy AWS Site-to-Site VPN over existing Internet connectivity
  2. Provide the Direct Connect Letter of Authorization and Connecting Facility Assignment
  3. Establish Direct Connect connections at separate Direct Connect locations with redundant customer paths
  4. 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?

  1. Keep Site-to-Site VPN as a backup path with routing preferences controlling failover
  2. Run Site-to-Site VPN over Direct Connect using a supported public or private IP transport design
  3. Deploy AWS Site-to-Site VPN over existing Internet connectivity
  4. 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?

  1. Configure a Direct Connect public virtual interface
  2. Share a central transit gateway through AWS Resource Access Manager
  3. Use a transit virtual interface to a Direct Connect gateway associated with the transit gateway
  4. 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?

  1. Create a private virtual interface toward the VPC's virtual private gateway or Direct Connect gateway
  2. Do not treat individual virtual private gateways as a transitive branch routing hub
  3. Establish Direct Connect connections at separate Direct Connect locations with redundant customer paths
  4. Use AWS Site-to-Site VPN private IP VPN over Direct Connect with Transit Gateway
  5. 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?

  1. Run Site-to-Site VPN over Direct Connect using a supported public or private IP transport design
  2. Use a transit virtual interface to a Direct Connect gateway associated with the transit gateway
  3. Configure a Direct Connect public virtual interface
  4. 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?

  1. Run Site-to-Site VPN over Direct Connect using a supported public or private IP transport design
  2. Configure a Direct Connect public virtual interface
  3. Deploy AWS Site-to-Site VPN over existing Internet connectivity
  4. 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.

AWS Certified Advanced Networking - Specialty ANS-C01 Practice Tests