SOA-C02 Networking and Content Delivery Practice Test 7 — 15 Questions

Question 1

A company has two Amazon VPCs: VPC-A (10.0.0.0/16) and VPC-B (10.1.0.0/16) in the same AWS Region. The SysOps administrator needs to enable private IP connectivity between the two VPCs without using the public internet. The solution must be simple, low-cost, and provide high throughput. Which AWS service should the administrator use?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

VPC peering. VPC peering is the correct choice because it enables direct private IP connectivity between two VPCs using the AWS global network, without requiring internet gateways, VPNs, or physical connections. It is simple to set up (no additional hardware or software), low-cost (no per-hour charges, only data transfer costs), and provides high throughput (bandwidth is limited only by the instance types, not by the peering connection itself).

Answer

AWS Site-to-Site VPN

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AWS Direct Connect

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AWS Transit Gateway

Question 2

A company has multiple on-premises branch offices, each with a site-to-site VPN connection to a single VPC in AWS. The SysOps administrator needs to enable communication between the branch offices using the AWS cloud as a hub. Which configuration should be implemented to achieve this with the least operational overhead?

Accepted Answer

Use dynamic routing (BGP) on all VPN connections and enable route propagation on the virtual private gateway (VGW).. Enabling dynamic routing (BGP) on all VPN connections and propagating routes from the virtual private gateway (VGW) into the VPC route table allows each branch office to learn the CIDR blocks of all other branch offices automatically. This eliminates the need for manual static route entries and ensures that traffic between branch offices is routed through the VPC hub with minimal operational overhead, as BGP handles failover and route updates dynamically.

Answer

Configure static routes in the VPC route table pointing to each VPN connection.

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Create a separate Transit VPC with EC2-based VPN appliances to route traffic between branch offices.

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Place all branch offices in the same IPsec tunnel by configuring identical pre-shared keys.

Question 3

A company has a web application running on EC2 instances behind an Application Load Balancer (ALB) in the us-west-2 Region. Users are distributed globally and experience high latency. The SysOps administrator wants to improve latency and offload SSL termination to the edge. Which AWS service should be used with the ALB as the origin?

Accepted Answer

Amazon CloudFront. Amazon CloudFront is a content delivery network (CDN) that caches content at edge locations worldwide, reducing latency for global users. It can offload SSL termination at the edge by accepting HTTPS requests from clients and forwarding them to the ALB over HTTP or HTTPS, thereby reducing the load on the origin. This directly addresses the requirements of improving latency and offloading SSL termination.

Answer

AWS Global Accelerator

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AWS WAF (Web Application Firewall)

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Amazon Route 53 with Latency Based Routing

Question 4

A company has two Amazon VPCs in the same AWS Region with non-overlapping CIDR blocks. The SysOps administrator needs to establish private connectivity between the two VPCs with high throughput and minimal cost. Which solution should the administrator implement?

Accepted Answer

VPC peering. VPC peering is the correct solution because it establishes private connectivity between two VPCs in the same AWS Region using the AWS backbone network, with no bandwidth limits and no single point of failure. It incurs no additional cost beyond data transfer charges, making it the most cost-effective option for high-throughput connectivity between two VPCs with non-overlapping CIDR blocks.

Answer

AWS Transit Gateway

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AWS Direct Connect

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AWS VPN CloudHub

Question 5

A company hosts a static website on Amazon S3. Users access the website from around the world. The SysOps administrator needs to deliver content with low latency and support HTTPS with a custom domain. Which AWS service should be used?

Accepted Answer

Amazon CloudFront. Amazon CloudFront is a content delivery network (CDN) that caches static content at edge locations worldwide, reducing latency for global users. It natively supports HTTPS with custom domains via SSL/TLS certificates from AWS Certificate Manager (ACM) and integrates with S3 as an origin. This combination of low-latency delivery and HTTPS termination makes CloudFront the correct choice for this scenario.

Answer

AWS Global Accelerator

Answer

Amazon Route 53 latency-based routing

Answer

S3 Transfer Acceleration

Question 6

A company has two Amazon VPCs (VPC-A and VPC-B) in the same AWS Region with non-overlapping CIDR blocks. The SysOps administrator needs to establish private IP connectivity between the two VPCs with high throughput and minimal cost. Which solution should the administrator implement?

Accepted Answer

VPC Peering. VPC Peering is the correct solution because it allows direct private IP connectivity between two VPCs in the same AWS Region using the AWS global network backbone, with no bandwidth bottlenecks, no single point of failure, and no additional cost beyond data transfer charges. Since the VPCs have non-overlapping CIDR blocks, they can be peered without route conflicts, and traffic flows entirely within AWS without traversing the public internet or requiring a transit hub.

Answer

AWS Transit Gateway

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AWS VPN CloudHub

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AWS Direct Connect

Question 7

A company runs a web application on EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The application needs to serve HTTPS content. The SysOps administrator wants to offload SSL termination to the ALB and automatically renew the certificate before expiration. Which solution should the administrator implement?

Accepted Answer

Use AWS Certificate Manager (ACM) to request a public certificate and associate it with the ALB.. AWS Certificate Manager (ACM) integrates natively with Application Load Balancers to handle SSL/TLS termination. ACM can automatically renew public certificates issued by Amazon's trusted certificate authority, eliminating the need for manual renewal. By associating the ACM certificate with the ALB's HTTPS listener, the administrator offloads SSL termination and ensures automatic certificate renewal before expiration.

Answer

Upload a third-party certificate to IAM and associate it with the ALB.

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Store the certificate in Amazon S3 and configure the ALB to read from S3.

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Use a self-signed certificate on each EC2 instance and configure the ALB for TCP passthrough.

Question 8

A company has an on-premises data center connected to AWS via an AWS Direct Connect private virtual interface (VIF). The SysOps administrator needs to ensure that all traffic between the on-premises network and Amazon S3 in the same AWS Region stays within the AWS network and does not traverse the internet. Which solution should the administrator implement?

Accepted Answer

Use a Direct Connect gateway and a private VIF with VPC endpoints for S3. A private VIF with VPC endpoints for S3 (Gateway Endpoints) ensures that traffic from on-premises to S3 stays within the AWS network. The private VIF provides connectivity to the VPC, and the Gateway Endpoint routes S3 traffic through the AWS backbone without traversing the internet. This combination meets the requirement of keeping traffic within the AWS network.

Answer

Use a Direct Connect gateway and a public VIF with a route to S3 prefix lists

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Use a VPN connection over Direct Connect to access S3

Answer

Use a Transit Gateway with a private VIF and route S3 traffic through a NAT instance

Question 9

A company has a VPC with public and private subnets. The private subnets need outbound internet access to download software updates while preventing any inbound internet traffic. The SysOps administrator must minimize costs. Which solution should the administrator implement?

Accepted Answer

Launch a NAT instance in a public subnet with an Elastic IP and disable source/destination check, then update private subnet route tables. A NAT instance, when launched in a public subnet with an Elastic IP and source/destination check disabled, can route outbound traffic from private subnets to the internet while blocking unsolicited inbound connections. This solution minimizes costs compared to a NAT Gateway, as NAT instances use existing EC2 instance pricing and can be further reduced with spot instances or smaller instance types.

Answer

Create a NAT Gateway in a public subnet and update the private subnet route table to use it

Answer

Attach an Internet Gateway to the VPC and add a default route to the Internet Gateway in the private subnets

Answer

Use AWS Transit Gateway with a VPN connection to an on-premises data center for internet access

Question 10

A company has an Amazon VPC with a CIDR block of 10.0.0.0/16 and an AWS Site-to-Site VPN connection to an on-premises data center. The on-premises DNS servers host a private domain 'corp.example.com'. The SysOps administrator needs to enable EC2 instances in the VPC to resolve DNS names for 'corp.example.com' using the on-premises DNS servers. Which Route 53 feature should be configured?

Accepted Answer

Route 53 Resolver outbound endpoints with forwarding rules. Route 53 Resolver outbound endpoints allow EC2 instances in a VPC to forward DNS queries for a specific domain (e.g., corp.example.com) to on-premises DNS servers via the Site-to-Site VPN connection. By creating a forwarding rule on the outbound endpoint, DNS queries for corp.example.com are sent to the on-premises DNS resolvers, enabling resolution of private DNS names without exposing the VPC to inbound traffic.

Answer

Route 53 Resolver inbound endpoints

Answer

VPC peering between the VPC and the on-premises network

Answer

Route 53 private hosted zone for corp.example.com

Question 11

A company has an Application Load Balancer (ALB) that routes traffic to Amazon EC2 instances in private subnets of a VPC. The SysOps administrator needs to ensure that the EC2 instances can download software updates from the internet, but they must not be directly accessible from the internet. The solution should minimize operational overhead. Which solution should the administrator implement?

Accepted Answer

Attach a NAT Gateway to a public subnet and configure the private subnet route table to send 0.0.0.0/0 traffic to the NAT Gateway.. A NAT Gateway (option B) allows EC2 instances in private subnets to initiate outbound connections to the internet (e.g., for software updates) while preventing any unsolicited inbound connections from the internet. It is a fully managed AWS service that automatically scales and requires no patching, minimizing operational overhead compared to a NAT instance. The private subnet route table directs 0.0.0.0/0 traffic to the NAT Gateway, which is placed in a public subnet with an Elastic IP address to enable internet access.

Answer

Place the EC2 instances in a public subnet and configure security group inbound rules to block all traffic.

Answer

Launch a NAT instance in a public subnet with an Elastic IP address and configure route tables accordingly.

Answer

Attach an Internet Gateway to the VPC and add a route to the private subnet route table pointing 0.0.0.0/0 to the Internet Gateway.

Question 12

A company has a VPC with public and private subnets. The private subnets host application servers that need to make outbound HTTPS connections to the internet. The SysOps administrator must implement a solution that provides outbound internet connectivity while preventing inbound connections from the internet. Additionally, the solution must allow the company to control which domains the application servers can access. Which solution should the administrator implement?

Accepted Answer

Configure a NAT instance with proxy software and use route tables to direct traffic from private subnets to the NAT instance.. A NAT instance with proxy software (e.g., Squid) allows outbound HTTPS connections from private subnets while blocking inbound connections, and the proxy software can enforce domain-level access control via allow/deny lists. This meets the requirement to restrict which domains the application servers can access, which a standard NAT Gateway cannot do because it only translates IP addresses and cannot filter by domain name.

Answer

Configure a NAT Gateway and use security group outbound rules to restrict destinations.

Answer

Configure an egress-only Internet Gateway and route private subnet traffic to it.

Answer

Configure a VPC endpoint for HTTPS and route private subnet traffic to it.

Question 13

A company has an Amazon VPC with public and private subnets across two Availability Zones. The company hosts a web application on EC2 instances in the private subnets. The application needs to access an Amazon S3 bucket to upload and download files. The SysOps administrator must ensure that traffic to S3 does not traverse the internet and minimizes data transfer costs. Which solution should the administrator implement?

Accepted Answer

Create an S3 VPC Gateway Endpoint in the VPC and associate it with the route tables of the private subnets.. An S3 VPC Gateway Endpoint provides a private, cost-effective connection to S3 from within the VPC without traversing the internet. By associating the endpoint with the route tables of the private subnets, traffic destined for S3 is routed directly through AWS's internal network, avoiding data transfer costs and internet egress charges.

Answer

Create an S3 VPC Interface Endpoint in the VPC and associate it with the security groups of the private subnets.

Answer

Set up a NAT Gateway in the public subnets and add a route to the private subnets' route tables pointing to the NAT Gateway for S3 traffic.

Answer

Use AWS PrivateLink with an S3 endpoint service hosted in a different VPC.

Question 14

A company has an Amazon CloudFront distribution that delivers static content from an Amazon S3 bucket. The SysOps administrator needs to ensure that the content can only be accessed through CloudFront and not directly from the S3 bucket URL. The solution should use AWS managed services with minimal configuration. Which solution should the administrator implement?

Accepted Answer

Configure the S3 bucket policy to deny all access except from the CloudFront distribution's origin access identity (OAI).. Configuring the S3 bucket policy to deny all access except from the CloudFront distribution's origin access identity (OAI) ensures that only CloudFront can retrieve objects from the S3 bucket. The OAI is a special CloudFront user that authenticates requests to S3, and the bucket policy explicitly grants GetObject access only to that principal, blocking any direct S3 URL access. This uses AWS managed services (CloudFront and S3) with minimal configuration—no custom code or additional infrastructure.

Answer

Make the S3 bucket private and use pre-signed URLs for CloudFront.

Answer

Use AWS WAF on CloudFront to block direct access to S3 by checking the Referer header.

Answer

Create a VPC endpoint for S3 and restrict access to the bucket from the CloudFront IP addresses.

Question 15

A company runs an application on Amazon EC2 instances in private subnets of a VPC. The application needs to upload files to an Amazon S3 bucket in the same AWS Region. The SysOps administrator wants to ensure that traffic to S3 does not traverse the internet and minimizes data transfer costs. Which solution should the administrator implement?

Accepted Answer

Create an S3 Gateway Endpoint and add a route in the private subnet route table pointing to it.. An S3 Gateway Endpoint is the correct solution because it provides private connectivity from a VPC to S3 without traversing the internet, using AWS's internal network. By adding a route in the private subnet's route table pointing to the gateway endpoint, traffic to S3 stays within the AWS backbone, minimizing data transfer costs (no NAT gateway charges) and avoiding internet egress fees.

Answer

Create a NAT gateway in a public subnet and route private subnet traffic to it.

Answer

Create an S3 Interface Endpoint and assign a security group.

Answer

Use AWS PrivateLink to connect to S3.