Amazon AWS Certified Solutions Architect - Associate SAA-C03 Practice Test 79

Question 780

Business units want a defensible monthly bill breakdown for AWS inter-AZ, inter-Region and Internet data egress by application account. Which billing input supports this?

Analyze AWS Data Exports/Cost and Usage Report with data-transfer usage types, linked account and cost allocation tags.
Estimate network egress from EC2 CPU utilization charts without inspecting Cost and Usage Report data-transfer line items.
Use only a single monthly AWS total with no account, application tags or data-transfer usage-type breakdown and treat it as sufficient chargeback evidence.
Use only VPC Flow Logs as a final dollar-denominated invoice for every S3 replication, NAT and managed-service transfer, without reconciling AWS Data Exports.

Explanation

Correct Answer

Detailed billing records reveal transfer categories and charges that high-level service totals may obscure.

Incorrect Answers

Compute utilization does not identify transfer destination, data movement service or billed inter-AZ/Region/Internet usage types.

Without data-transfer usage types and allocation dimensions, the finance team cannot separate AZ, Region and Internet egress drivers by application.

Flow logs can explain specific IP traffic but do not directly provide all billed service usage types, rates, account tags or managed-service transfer records needed for complete chargeback.

Question 781

A global user base uploads huge files to S3. Operators propose S3 Transfer Acceleration for every upload. What analysis should precede enabling it?

Enable Transfer Acceleration globally on every S3 upload and claim it always minimizes cost regardless of client distance or file size.
Benchmark long-distance upload improvement versus the additional S3 Transfer Acceleration charge for the actual client origins.
Enable S3 Transfer Acceleration globally and assume it always shortens every nearby client upload at zero additional transfer charge.
Compare only S3 bucket storage rates and ignore per-transfer acceleration pricing and upload completion time.

Explanation

Correct Answer

Transfer Acceleration leverages edge ingress but has additional acceleration pricing; some client paths may not benefit enough.

Incorrect Answers

Acceleration adds fees and may not improve short or local paths enough to justify the charges; measure representative uploads.

Acceleration can add a transfer surcharge and is not beneficial on every route; measure representative remote upload paths and cost.

The decision concerns transfer speed and accelerated-request/data movement pricing, not just the destination bucket’s at-rest storage class.

Question 782

A low-margin image service needs CloudFront in North America and Europe but does not require the lowest latency in every global edge geography. Which option can trade reach for price?

Evaluate an appropriate CloudFront price class that limits more expensive edge locations if the performance tradeoff is acceptable.
Use the most expensive unrestricted CloudFront edge footprint for a constrained regional audience without measuring latency and demand.
Select CloudFront Price Class All and assume serving from every edge is guaranteed to cost less than a restricted class for all customers.
Restrict CloudFront to a lower price class without testing whether the application’s required customer geography still meets latency and availability goals.

Explanation

Correct Answer

Price classes let distributions restrict selected edge delivery geographies to control cost at potential latency expense.

Incorrect Answers

A limited price class can reduce edge costs when distant edge performance is not required, subject to actual user experience.

Price Class All can use more costly edge locations. Restricted price classes trade potential latency for geography-based pricing limits.

Price-class savings require acceptance of the resulting edge-location coverage and performance; benchmark representative users.

Question 783

A backend makes high-volume synchronous calls to a database in another AZ, but the application also requires AZ-failure recovery. What is a safe optimization?

Place all application and database replicas in one AZ to remove transfer fees and assume failover durability remains fully multi-AZ.
Disable multi-AZ recovery completely and force every database and application component into one AZ solely to avoid cross-AZ bytes.
Keep the same cross-AZ synchronous read path and assume increasing EC2 instance CPU removes inter-AZ transfer charges.
Evaluate an AZ-local primary application/database read path while retaining and testing the required cross-AZ failover or replication strategy.

Explanation

Correct Answer

Locality can reduce steady transfer and latency without requiring all application replicas to reside in one failure domain.

Incorrect Answers

Cost savings from locality cannot justify silently eliminating independent AZ failure protection; retain a tested HA design.

Removing required cross-AZ resilience may violate RPO/RTO and availability targets. Optimize high-volume reads locally while preserving failover.

Cross-AZ byte charges arise from the actual network path; instance resizing does not change where packets travel.

Question 784

A security team enables full-volume VPC traffic mirroring for every instance into analysis appliances, but network monitoring costs escalate. Which optimization should be assessed?

Filter mirror sessions to relevant traffic and size mirror targets while validating analytics coverage and delivery charges.
Mirror all traffic continuously without filters, sampling or collector sizing and assume the copied bytes cause no additional billing.
Restrict mirror selection filters to security-significant packet classes but then provision oversized always-on collector instances for peak throughput that no longer occurs.
Disable VPC Traffic Mirroring entirely without checking whether security investigation requirements still require those packet classes.

Explanation

Correct Answer

Mirroring adds duplicate network traffic, target compute/processing costs and can increase billable network usage.

Incorrect Answers

Traffic mirroring adds packet copies and collector processing; scope only needed flows and model its storage/analysis costs.

Filtering reduces mirrored packet volume, but collector compute and fixed resources may remain overprovisioned. Re-size the analysis fleet along with capture scope while preserving security coverage.

Monitoring cost optimization must preserve evidence coverage. Use selective mirroring filters, retention and target sizing rather than blind removal.

Question 785

A team creates an S3 gateway endpoint but private subnets continue sending S3 requests through NAT. What integration step was likely missed?

Creating an S3 gateway endpoint automatically replaces every private subnet default route even if that endpoint is not associated with its route table.
The endpoint was not associated with the required private subnet route tables or requests do not match the endpoint route.
Create an interface endpoint for a different AWS service and assume its endpoint DNS automatically diverts all S3 traffic away from NAT.
Add an inbound security-group rule to EC2 instances for TCP/443 but leave their private subnet route tables unchanged.

Explanation

Correct Answer

Verify the S3 prefix-list route and Regional endpoint access instead of assuming endpoint creation changes all paths.

Incorrect Answers

Gateway endpoints add routes to associated route tables only; unused endpoints cannot redirect NAT traffic or reduce related fees.

Gateway endpoints require S3 prefix-list routing in associated subnet route tables; an unrelated interface endpoint cannot replace those routes.

Security groups permit traffic but do not choose a gateway endpoint versus NAT; the affected route table association is decisive.

Question 786

One interface VPC endpoint serves API clients in three Availability Zones, but its only endpoint ENI is in AZ-a. Adding AZ-local ENIs increases endpoint-hour charges. What other costs and failure-domain risks must be assessed before choosing one ENI or three?

Use only the AZ-a ENI and assume clients in the other AZs never cross an Availability Zone boundary or depend on AZ-a.
Delete every endpoint ENI and rely on the existing private DNS name to keep resolving a functional PrivateLink service with no network target.
Use one endpoint ENI and enable cross-zone load balancing on PrivateLink, assuming it automatically relocates an ENI into every client AZ at no charge.
Compare additional per-AZ endpoint-hour charges with cross-AZ traffic, supported endpoint placement and AZ-failure resilience required by clients.

Explanation

Correct Answer

A single-AZ endpoint can save fixed endpoint-hours but create cross-AZ traffic and an AZ dependency. Multiple AZ-local endpoint ENIs add fixed charges but can improve locality and resilience; decide from the application requirements.

Incorrect Answers

An interface endpoint ENI exists in a selected subnet/AZ; requests from other AZs can traverse AZ boundaries and lose that path if the hosting AZ fails. One ENI is not an automatic multi-AZ design.

Private DNS naming does not create connectivity if the relevant endpoint network interface is removed. A permitted alternate service path must exist before eliminating the endpoint.

PrivateLink interface endpoints do not have an ALB cross-zone switch that creates additional local endpoint ENIs. The endpoint subnets/AZs and their hourly charges must be planned.

Question 787

A team replaces a NAT gateway with a low-cost NAT instance but has no high-availability or patching plan. What nonprice risk did it add?

An EC2 NAT instance has the same managed AWS zonal redundancy and patching responsibilities as a NAT gateway by default.
Enable instance detailed monitoring and assume CloudWatch automatically installs OS security patches and fails over a stopped NAT instance.
The NAT instance is now a customer-managed, potentially single-instance egress failure and maintenance responsibility.
Increase the NAT instance network bandwidth but leave a single AZ dependency and manual operating-system maintenance.

Explanation

Correct Answer

Cost optimization must include resilient routes, scaling, patching, bandwidth and instance charges.

Incorrect Answers

A NAT instance is customer managed; availability, instance maintenance, throughput sizing and patching remain the owner’s responsibility.

Monitoring can alert on instance health but does not replace OS maintenance or design/configuration of resilient NAT instance egress.

More throughput cannot eliminate single-AZ availability or customer responsibility for patching/routing/replacement.

Question 788

Even when a private workload and its S3 target are in the same Region, NAT traffic incurs cross-AZ charges because the NAT sits in another AZ. Why?

The VPC route forces packets across an AZ boundary to reach the remote gateway before egress.
Cross-AZ routing toward a zonal NAT gateway is free as long as both private subnets belong to one VPC.
Change the bucket storage class to Standard-IA and assume it suppresses cross-AZ EC2-to-NAT transit fees.
Increase NAT gateway throughput quotas while keeping the same cross-AZ route and assume larger capacity removes cross-AZ data transfer charges.

Explanation

Correct Answer

Inspect effective route tables and flow path instead of assuming same-Region implies no inter-AZ charges.

Incorrect Answers

VPC membership alone does not waive cross-AZ transfer; actual AZ boundary routing and measured bytes are cost drivers.

S3 storage class pricing is distinct from VPC cross-AZ traffic caused by a remote zonal NAT gateway route.

Capacity changes do not change the route’s AZ traversal; an AZ-local gateway/eligible endpoint is needed to avoid avoidable transit.

Question 789

A CloudFront cache behavior has Minimum TTL = 0 and forwards Cache-Control: no-cache personalized responses from the origin. Repeated viewer requests still revalidate with or fetch from the origin, so origin request costs remain high. Why does caching not substantially offload the origin?

Responses are repeatedly revalidated or fetched because caching is restricted, so the edge cannot substantially offload the origin.
Setting Cache-Control: no-store for every edge response automatically increases CloudFront hit rate and lowers origin requests.
Increase CloudFront origin request timeout and assume it makes personalized no-cache responses reusable for future viewers.
Change CloudFront Price Class to include more edge locations but leave caching restrictions and personalized cache keys unchanged.

Explanation

Correct Answer

With minimum TTL zero, the no-cache response requires revalidation rather than ordinary shared reuse. A positive minimum TTL can override even origin no-cache/no-store, so the behavior depends on cache policy, origin headers and personalization boundaries.

Incorrect Answers

Disabling reusable caching makes edge locations fetch origin data more frequently, reducing any origin cost benefit.

Timeout settings govern origin failure handling, not cacheability or safe shared caching of personalized responses.

More edge coverage does not make nonshareable personalized responses cacheable; origin fetch/revalidation costs can persist.

Question 790

An S3 replication rule uses Replication Time Control (RTC) for every log object, but only compliance records need the documented 15-minute replication SLA. Most verbose debug objects can replicate without that SLA. Which optimization retains the critical guarantee?

Turn off all S3 replication and rely on Route 53 weighted DNS answers to maintain a compliant secondary copy of the critical objects.
Enable S3 RTC on the noncritical debug prefix only and disable replication for compliance records, assuming the RTC price is lowered by reversing the scope.
Change the replication destination bucket storage class but leave RTC enabled for every debug object, assuming the per-object RTC feature charge is eliminated.
Use rule filters to apply RTC only to compliance-critical prefixes or tags; use standard replication for eligible other objects and validate the lower-priced SLA tradeoff.

Explanation

Correct Answer

S3 supports prefix/tag-filtered replication rules and RTC enabled on the selected rule. Limit RTC to data that needs the 15-minute replication objective and validate standard replication for other data, preserving all mandatory secondary copies.

Incorrect Answers

DNS routing determines which application endpoint a client resolves and does not replicate S3 objects. Removing required replication fails the documented compliance recovery objective.

RTC provides the shorter documented replication-time promise to the objects covered by its rule. Assigning it to noncritical objects while excluding critical records reverses the business requirement.

Storage class economics and RTC replication features are distinct. Merely changing destination storage class cannot eliminate the charges for RTC replication still enabled on noncritical objects.

Pass Your Amazon AWS Certified Solutions Architect - Associate SAA-C03 Exam Easy!

Question 780

Explanation

Correct Answer

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Question 781

Explanation

Correct Answer

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Question 782

Explanation

Correct Answer

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Question 783

Explanation

Correct Answer

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Question 784

Explanation

Correct Answer

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Question 785

Explanation

Correct Answer

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Question 786

Explanation

Correct Answer

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Question 787

Explanation

Correct Answer

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Question 788

Explanation

Correct Answer

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Question 789

Explanation

Correct Answer

Incorrect Answers

Question 790

Explanation

Correct Answer

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AWS Certified Solutions Architect - Associate SAA-C03 Practice Tests