AWS Certified Advanced Networking - Specialty ANS-C01 Practice Test 20
Question 190
For the scenario "A web application needs HTTP edge caching and WAF protection but was placed behind a TCP-only NLB", the proposed response is "Use CloudFront with an HTTP-capable origin and associate AWS WAF on the distribution". Which network behavior makes this suitable?
- Content delivery edges shorten the viewer-to-edge leg and offload TLS processing
- CloudFront and AWS WAF apply supported layer-seven controls at the edge
- Source-IP visibility depends on supported endpoint integrations and forwarding semantics
- Global Accelerator steering uses stable anycast IPs rather than relying solely on resolver TTL
Explanation
Correct Answer
B:CloudFront and AWS WAF apply supported layer-seven controls at the edge. This mechanism directly explains why the proposed change, use CloudFront with an HTTP-capable origin and associate AWS WAF on the distribution, fits this particular packet path or control requirement. Without it, network Load Balancer alone does not provide equivalent HTTP cache and WAF request inspection. A suitable verification is that repeated eligible responses are served at edges and blocked HTTP requests do not reach origin.
Incorrect Answers
A:Content delivery edges shorten the viewer-to-edge leg and offload TLS processing explains a different case, for example when a website requires viewers in distant locations to reach the nearest available HTTP edge with HTTPS termination. In the current topology, the deciding factor is that cloudFront and AWS WAF apply supported layer-seven controls at the edge; this choice therefore does not explain the specified remedy.
C:Source-IP visibility depends on supported endpoint integrations and forwarding semantics explains a different case, for example when an enterprise must preserve source-client IP for a global TCP service using an accelerator and regional targets. In the current topology, the deciding factor is that cloudFront and AWS WAF apply supported layer-seven controls at the edge; this choice therefore does not explain the specified remedy.
D:Global Accelerator steering uses stable anycast IPs rather than relying solely on resolver TTL explains a different case, for example when a multiplayer client cannot tolerate DNS change delays during regional failure and uses UDP transport. In the current topology, the deciding factor is that cloudFront and AWS WAF apply supported layer-seven controls at the edge; this choice therefore does not explain the specified remedy.
Question 191
A team chooses to Publish child name-server delegation records in the authoritative parent zone after observing: A parent domain delegates a subdomain to another independently administered public hosted zone. Which result would BEST verify the change?
- Valid records verify with a validating resolver and tampered signatures are rejected
- The same instance resolves its private name and an allowed public domain
- External iterative resolution reaches the child zone authoritative name servers
- Queries from on premises return the intended private records without publishing them publicly
Explanation
Correct Answer
C:External iterative resolution reaches the child zone authoritative name servers. This directly tests whether the selected change, publish child name-server delegation records in the authoritative parent zone, achieved the intended network outcome. The key mechanism is that dNS delegation transfers authority through NS records rather than duplicating every child A record. The incident or compliance risk being reduced was that creating records in an undelegated child zone does not make public resolvers consult it.
Incorrect Answers
A:Valid records verify with a validating resolver and tampered signatures are rejected might confirm another remediation, for instance when a security team wants signed public DNS answers without falsely claiming that ordinary DNS transport is encrypted. This question instead requires demonstrating that external iterative resolution reaches the child zone authoritative name servers. The alternative would not validate the selected network fix.
B:The same instance resolves its private name and an allowed public domain might confirm another remediation, for instance when an EC2 application in a VPC must resolve both internal records and external internet domain names. This question instead requires demonstrating that external iterative resolution reaches the child zone authoritative name servers. The alternative would not validate the selected network fix.
D:Queries from on premises return the intended private records without publishing them publicly might confirm another remediation, for instance when an on-premises resolver cannot resolve a private Route 53 hosted zone associated with an application VPC. This question instead requires demonstrating that external iterative resolution reaches the child zone authoritative name servers. The alternative would not validate the selected network fix.
Question 192
The team addressed this problem: An AWS organization has a shared VPC but a participant account cannot edit the subnet route table it does not own. Which observation BEST demonstrates the required result?
- DNS answers resolve to endpoint ENI addresses and permitted calls stay private
- Subnet traffic to S3 uses the endpoint target with no public NAT dependency
- A test source retains connection state and responses return via the approved central egress
- The owner updates routes while the participant deploys supported workload resources
Explanation
Correct Answer
D:The owner updates routes while the participant deploys supported workload resources. This directly tests whether the selected change, keep routing changes with the VPC owner and allocate permitted participant resource privileges, achieved the intended network outcome. The key mechanism is that vPC sharing separates ownership of shared network constructs from participant workloads. The incident or compliance risk being reduced was that assuming a participant can administer all shared VPC routes ignores the owner-account boundary.
Incorrect Answers
A:DNS answers resolve to endpoint ENI addresses and permitted calls stay private might confirm another remediation, for instance when an interface endpoint exists but its private DNS alias is disabled and applications still resolve a public service address. This question instead requires demonstrating that the owner updates routes while the participant deploys supported workload resources. The alternative would not validate the selected network fix.
B:Subnet traffic to S3 uses the endpoint target with no public NAT dependency might confirm another remediation, for instance when a company set up a gateway endpoint for S3 but forgot to associate it with the subnet's route table. This question instead requires demonstrating that the owner updates routes while the participant deploys supported workload resources. The alternative would not validate the selected network fix.
C:A test source retains connection state and responses return via the approved central egress might confirm another remediation, for instance when a spoke VPC with a default route to Transit Gateway cannot reach the internet through central NAT because the egress VPC lacks the return path. This question instead requires demonstrating that the owner updates routes while the participant deploys supported workload resources. The alternative would not validate the selected network fix.
Question 193
For this networking situation, An EC2 application in a peered VPC assumes it can reach a third VPC by using the middle peer, the team applies "Create an explicit direct peering connection or redesign with Transit Gateway". Which validation is strongest?
- The tested third-VPC path uses a supported direct or transit attachment
- A test source retains connection state and responses return via the approved central egress
- Reachability tests prove allowed spokes connect while sensitive-to-audit traffic is blocked
- Subnet traffic to S3 uses the endpoint target with no public NAT dependency
Explanation
Correct Answer
A:The tested third-VPC path uses a supported direct or transit attachment. This directly tests whether the selected change, create an explicit direct peering connection or redesign with Transit Gateway, achieved the intended network outcome. The key mechanism is that vPC peering does not provide transitive routing across multiple peer connections. The incident or compliance risk being reduced was that a middle VPC cannot simply forward traffic between two peers as a transit router.
Incorrect Answers
B:A test source retains connection state and responses return via the approved central egress might confirm another remediation, for instance when a spoke VPC with a default route to Transit Gateway cannot reach the internet through central NAT because the egress VPC lacks the return path. This question instead requires demonstrating that the tested third-VPC path uses a supported direct or transit attachment. The alternative would not validate the selected network fix.
C:Reachability tests prove allowed spokes connect while sensitive-to-audit traffic is blocked might confirm another remediation, for instance when a shared Transit Gateway route table receives propagated spokes but a sensitive subnet must never see the audit VPC. This question instead requires demonstrating that the tested third-VPC path uses a supported direct or transit attachment. The alternative would not validate the selected network fix.
D:Subnet traffic to S3 uses the endpoint target with no public NAT dependency might confirm another remediation, for instance when a company set up a gateway endpoint for S3 but forgot to associate it with the subnet's route table. This question instead requires demonstrating that the tested third-VPC path uses a supported direct or transit attachment. The alternative would not validate the selected network fix.
Question 194
For this AWS/hybrid networking scenario—A parent domain delegates a subdomain to another independently administered public hosted zone—which action should the engineer take?
- Check resolver caching and lower authoritative TTL ahead of the planned migration
- Publish child name-server delegation records in the authoritative parent zone
- Configure a Route 53 Resolver outbound endpoint and forwarding rule for the corporate domain
- Deploy a Route 53 Resolver inbound endpoint and conditionally forward the private domain from on premises
Explanation
Correct Answer
B:Publish child name-server delegation records in the authoritative parent zone. The stated configuration and business requirement call for this change because dNS delegation transfers authority through NS records rather than duplicating every child A record. Leaving the existing gap unresolved could mean that creating records in an undelegated child zone does not make public resolvers consult it. Confirm the improvement by showing that external iterative resolution reaches the child zone authoritative name servers.
Incorrect Answers
A:Check resolver caching and lower authoritative TTL ahead of the planned migration would address a different scenario, such as when a web administrator changed a DNS record but some users still reach an old destination for several minutes. The present issue requires publish child name-server delegation records in the authoritative parent zone because the network path and control point are different; the alternative does not directly meet this requirement.
C:Configure a Route 53 Resolver outbound endpoint and forwarding rule for the corporate domain would address a different scenario, such as when a private EC2 workload must resolve legacy corporate names that only on-premises DNS hosts know. The present issue requires publish child name-server delegation records in the authoritative parent zone because the network path and control point are different; the alternative does not directly meet this requirement.
D:Deploy a Route 53 Resolver inbound endpoint and conditionally forward the private domain from on premises would address a different scenario, such as when an on-premises resolver cannot resolve a private Route 53 hosted zone associated with an application VPC. The present issue requires publish child name-server delegation records in the authoritative parent zone because the network path and control point are different; the alternative does not directly meet this requirement.
Question 195
A team chooses to Correct GRE tunnel parameters, BGP session details, and Connect peer routing after observing: A company uses a Transit Gateway Connect attachment to carry SD-WAN routes but the overlay peer is not Established. Which result would BEST verify the change?
- Approved public endpoint traffic follows the expected Direct Connect public routing path
- Attachment associations show the expected AWS resource and route reachability
- BGP becomes Established across the Connect peer and selected routes are reachable
- Disabling one entire location leaves the secondary hybrid path carrying traffic
Explanation
Correct Answer
C:BGP becomes Established across the Connect peer and selected routes are reachable. This directly tests whether the selected change, correct GRE tunnel parameters, BGP session details, and Connect peer routing, achieved the intended network outcome. The key mechanism is that transit Gateway Connect combines the supported GRE overlay with BGP route exchange. The incident or compliance risk being reduced was that a working underlay alone does not establish overlay routing for branch prefixes.
Incorrect Answers
A:Approved public endpoint traffic follows the expected Direct Connect public routing path might confirm another remediation, for instance when a company needs public AWS service API access across a Direct Connect public VIF but has not advertised eligible public prefixes. This question instead requires demonstrating that bGP becomes Established across the Connect peer and selected routes are reachable. The alternative would not validate the selected network fix.
B:Attachment associations show the expected AWS resource and route reachability might confirm another remediation, for instance when a team configured a Direct Connect private VIF but selected the wrong AWS account's virtual private gateway. This question instead requires demonstrating that bGP becomes Established across the Connect peer and selected routes are reachable. The alternative would not validate the selected network fix.
D:Disabling one entire location leaves the secondary hybrid path carrying traffic might confirm another remediation, for instance when a company wants a redundant connection but its two hosted Direct Connect links terminate in the same colocation facility. This question instead requires demonstrating that bGP becomes Established across the Connect peer and selected routes are reachable. The alternative would not validate the selected network fix.
Question 196
An AWS network architect encounters this situation: A SaaS application needs customer-specific TXT validation records but should not expose internal private records. Which change BEST meets the documented requirement?
- Configure a Route 53 Resolver outbound endpoint and forwarding rule for the corporate domain
- Deploy a Route 53 Resolver inbound endpoint and conditionally forward the private domain from on premises
- Enable Route 53 DNSSEC signing and validate the delegation chain at the registrar
- Publish public verification TXT records only in the internet-facing hosted zone
Explanation
Correct Answer
D:Publish public verification TXT records only in the internet-facing hosted zone. The stated configuration and business requirement call for this change because public and private hosted zones with the same domain can contain different visibility-controlled data. Leaving the existing gap unresolved could mean that placing an external validation TXT solely in a private hosted zone makes public validation fail. Confirm the improvement by showing that public DNS returns the validation token and private service names stay unexposed.
Incorrect Answers
A:Configure a Route 53 Resolver outbound endpoint and forwarding rule for the corporate domain would address a different scenario, such as when a private EC2 workload must resolve legacy corporate names that only on-premises DNS hosts know. The present issue requires publish public verification TXT records only in the internet-facing hosted zone because the network path and control point are different; the alternative does not directly meet this requirement.
B:Deploy a Route 53 Resolver inbound endpoint and conditionally forward the private domain from on premises would address a different scenario, such as when an on-premises resolver cannot resolve a private Route 53 hosted zone associated with an application VPC. The present issue requires publish public verification TXT records only in the internet-facing hosted zone because the network path and control point are different; the alternative does not directly meet this requirement.
C:Enable Route 53 DNSSEC signing and validate the delegation chain at the registrar would address a different scenario, such as when a security team wants signed public DNS answers without falsely claiming that ordinary DNS transport is encrypted. The present issue requires publish public verification TXT records only in the internet-facing hosted zone because the network path and control point are different; the alternative does not directly meet this requirement.
Question 197
A networking team must correct the following AWS condition: A company needs a redundant Site-to-Site VPN and both standard tunnels terminate on customer gateway devices. What is the MOST appropriate response?
- Configure both VPN tunnels and track routing or static route policy for failover
- Design Direct Connect primary and separately routed Site-to-Site VPN backup with BGP preferences
- Design nonoverlapping CIDRs and precise advertised prefixes across hybrid BGP boundaries
- Run supported IPsec VPN over Direct Connect or encrypt application traffic end to end
Explanation
Correct Answer
A:Configure both VPN tunnels and track routing or static route policy for failover. The stated configuration and business requirement call for this change because aWS Site-to-Site VPN connections normally supply two tunnels for availability. Leaving the existing gap unresolved could mean that operating only one tunnel sacrifices built-in redundancy during endpoint maintenance. Confirm the improvement by showing that failing one tunnel leaves the second route and connectivity operational.
Incorrect Answers
B:Design Direct Connect primary and separately routed Site-to-Site VPN backup with BGP preferences would address a different scenario, such as when a bank needs predictable private connectivity into AWS with an internet VPN failover during circuit outage. The present issue requires configure both VPN tunnels and track routing or static route policy for failover because the network path and control point are different; the alternative does not directly meet this requirement.
C:Design nonoverlapping CIDRs and precise advertised prefixes across hybrid BGP boundaries would address a different scenario, such as when an on-premises route is summarized too broadly and overlaps multiple cloud address ranges. The present issue requires configure both VPN tunnels and track routing or static route policy for failover because the network path and control point are different; the alternative does not directly meet this requirement.
D:Run supported IPsec VPN over Direct Connect or encrypt application traffic end to end would address a different scenario, such as when a company must encrypt sensitive hybrid application traffic even though it uses a private Direct Connect circuit. The present issue requires configure both VPN tunnels and track routing or static route policy for failover because the network path and control point are different; the alternative does not directly meet this requirement.
Question 198
For this AWS/hybrid networking scenario—A customer VPN uses static routing while the team expects automatic failover after network changes—which action should the engineer take?
- Use supported homogeneous Direct Connect LAG members at the same location and compatible settings
- Adopt supported BGP dynamic routing or explicitly maintain correct static failover logic
- Configure appropriate public BGP advertisements and verify allowed public service routing
- Correct bidirectional route advertisements and test the forward and return path
Explanation
Correct Answer
B:Adopt supported BGP dynamic routing or explicitly maintain correct static failover logic. The stated configuration and business requirement call for this change because static routes do not automatically learn newly announced AWS prefixes. Leaving the existing gap unresolved could mean that assuming static VPN routing detects every remote CIDR change can blackhole traffic. Confirm the improvement by showing that new approved AWS prefixes are learned or explicitly installed and test packets reach them.
Incorrect Answers
A:Use supported homogeneous Direct Connect LAG members at the same location and compatible settings would address a different scenario, such as when a network team builds a link aggregation group with circuits of incompatible speed or port location. The present issue requires adopt supported BGP dynamic routing or explicitly maintain correct static failover logic because the network path and control point are different; the alternative does not directly meet this requirement.
C:Configure appropriate public BGP advertisements and verify allowed public service routing would address a different scenario, such as when a company needs public AWS service API access across a Direct Connect public VIF but has not advertised eligible public prefixes. The present issue requires adopt supported BGP dynamic routing or explicitly maintain correct static failover logic because the network path and control point are different; the alternative does not directly meet this requirement.
D:Correct bidirectional route advertisements and test the forward and return path would address a different scenario, such as when a remote branch cannot reach AWS because its advertised VPC return prefix is absent from the corporate router. The present issue requires adopt supported BGP dynamic routing or explicitly maintain correct static failover logic because the network path and control point are different; the alternative does not directly meet this requirement.
Question 199
A cloud architect observes the following gap: A company wants standardized AWS WAF policies across hundreds of managed accounts and distributions. Which outcome is the principal concern?
- A one-time manual security review cannot catch all later permissive rule changes
- Asymmetric flows through different appliances can cause valid packets to be dropped
- Manually creating unrelated web ACL rules in each account can produce configuration drift
- Treating VPN encryption alone as segmentation can expose unintended services
Explanation
Correct Answer
C:Manually creating unrelated web ACL rules in each account can produce configuration drift. The missing control matters because firewall Manager centralizes eligible protection policy management at organization scale. The appropriate corrective action is to use AWS Firewall Manager with appropriate organization policy and account scope. To check the outcome, verify that new eligible resources receive the expected managed protection under the central policy.
Incorrect Answers
A:A one-time manual security review cannot catch all later permissive rule changes can be a real consequence when an organization wants automated discovery of broad SSH security-group rules across its accounts. Here the relevant failure is that manually creating unrelated web ACL rules in each account can produce configuration drift. The alternative names a different failure mode and does not best account for the stated condition.
B:Asymmetric flows through different appliances can cause valid packets to be dropped can be a real consequence when an application uses Gateway Load Balancer appliances but loses flows when return traffic crosses a different inspection appliance. Here the relevant failure is that manually creating unrelated web ACL rules in each account can produce configuration drift. The alternative names a different failure mode and does not best account for the stated condition.
D:Treating VPN encryption alone as segmentation can expose unintended services can be a real consequence when a government workload must prove that only approved ports cross an external VPN into a regulated VPC. Here the relevant failure is that manually creating unrelated web ACL rules in each account can produce configuration drift. The alternative names a different failure mode and does not best account for the stated condition.
Question 200
A team faces this situation: A SaaS service works from one branch but fails from another while both share central AWS Transit Gateway connectivity. It proposes: Compare branch-advertised prefixes, return routes, NAT and firewall state for each site. What underlying networking principle BEST explains this decision?
- Load-balancer health and client name resolution both affect which service receives packets
- Network path failures require examining each packet-filter and endpoint layer
- Metric aggregation windows can hide transient events that affect applications
- Similar AWS attachments do not imply identical on-premises policy or address translation
Explanation
Correct Answer
D:Similar AWS attachments do not imply identical on-premises policy or address translation. This mechanism directly explains why the proposed change, compare branch-advertised prefixes, return routes, NAT and firewall state for each site, fits this particular packet path or control requirement. Without it, editing the cloud workload SG based on one branch can introduce unnecessary exposure. A suitable verification is that a packet-path comparison locates the failing branch's distinct policy or translation step.
Incorrect Answers
A:Load-balancer health and client name resolution both affect which service receives packets explains a different case, for example when an NLB target is unhealthy while TCP traffic is delivered to a different instance by a manually configured DNS override. In the current topology, the deciding factor is that similar AWS attachments do not imply identical on-premises policy or address translation; this choice therefore does not explain the specified remedy.
B:Network path failures require examining each packet-filter and endpoint layer explains a different case, for example when an EC2 instance drops UDP while TCP works and a team assumes the security group must be the only blocker. In the current topology, the deciding factor is that similar AWS attachments do not imply identical on-premises policy or address translation; this choice therefore does not explain the specified remedy.
C:Metric aggregation windows can hide transient events that affect applications explains a different case, for example when a company is investigating short bursts of traffic that disappear from five-minute aggregated metrics. In the current topology, the deciding factor is that similar AWS attachments do not imply identical on-premises policy or address translation; this choice therefore does not explain the specified remedy.