AWS Elastic Load Balancer FAQs

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Questions and Answers

How do I decide which load balancer to select for my application?

You can select based on application needs: Application Load Balancer for flexible management and TLS termination, Network Load Balancer for extreme performance and static IP, Classic Load Balancer for EC2 Classic network.

Can I privately access Elastic Load Balancing APIs from my Amazon Virtual Private Cloud (VPC) without using public IPs?

True (A)

What does an Internet-facing load balancer need or have?

It has a public IP address and its DNS name is publicly resolvable to that IP address.

What does an internal-facing load balancer need or have?

<p>It has only private IP addresses and its DNS name is resolvable to private IPs.</p> Signup and view all the answers

Which operating systems does an Application Load Balancer support?

<p>Any operating system currently supported by the Amazon EC2 service.</p> Signup and view all the answers

Which protocols does an Application Load Balancer support?

<p>HTTP and HTTPS.</p> Signup and view all the answers

Is HTTP/2 supported on an Application Load Balancer?

<p>True (A)</p> Signup and view all the answers

What TCP ports can I use to load balance?

<p>1-65535.</p> Signup and view all the answers

Is WebSockets supported on an Application Load Balancer?

<p>True (A)</p> Signup and view all the answers

Is Request tracing supported on an Application Load Balancer?

<p>True (A)</p> Signup and view all the answers

Will my existing Classic Load Balancers have the same features and benefits as an Application Load Balancer?

<p>False (B)</p> Signup and view all the answers

Can I configure my Amazon EC2 instances to accept traffic only from my Application Load Balancers?

<p>True (A)</p> Signup and view all the answers

Can I configure a security group for the front-end of an Application Load Balancer?

<p>True (A)</p> Signup and view all the answers

Can I use the existing APIs that I use with my Classic Load Balancer with an Application Load Balancer?

<p>False (B)</p> Signup and view all the answers

How do I manage both Application and Classic Load Balancers simultaneously?

<p>You can use the ELB Console to manage both types from the same interface.</p> Signup and view all the answers

Can I convert my Classic Load Balancer to an Application Load Balancer (and vice versa)?

<p>False (B)</p> Signup and view all the answers

Can I migrate to Application Load Balancer from Classic Load Balancer?

<p>True (A)</p> Signup and view all the answers

Can I use an Application Load Balancer as a Layer-4 load balancer?

<p>False (B)</p> Signup and view all the answers

Can I use a single Application Load Balancer for handling HTTP and HTTPS requests?

<p>True (A)</p> Signup and view all the answers

Can I get a history of Application Load Balancing API calls made on my account for security analysis?

<p>True (A)</p> Signup and view all the answers

Does an Application Load Balancer support HTTPS termination?

<p>True (A)</p> Signup and view all the answers

What are the steps to get an SSL certificate for an Application Load Balancer?

<p>Use AWS Certificate Manager or create and upload a certificate request.</p> Signup and view all the answers

Is back-end server authentication supported with an Application Load Balancer?

<p>False (B)</p> Signup and view all the answers

How can I enable Server Name Indication (SNI) for my Application Load Balancer?

<p>It is automatically enabled when associating more than one TLS certificate with a secure listener.</p> Signup and view all the answers

Can I associate multiple certificates for the same domain to a secure listener?

<p>True (A)</p> Signup and view all the answers

Is IPv6 supported with an Application Load Balancer?

<p>True (A)</p> Signup and view all the answers

How do you set up rules on an Application Load Balancer?

<p>Configure rules with conditions and corresponding actions for listeners.</p> Signup and view all the answers

Are there limits on the resources for an Application Load Balancer?

<p>True (A)</p> Signup and view all the answers

How can I protect my web applications behind a load balancer from web attacks?

<p>Integrate your Application Load Balancer with AWS WAF.</p> Signup and view all the answers

For an Application Load Balancer, can I load balance to any arbitrary IP address?

<p>Yes, from the load balancer's VPC CIDR and certain RFC ranges.</p> Signup and view all the answers

How can I load balance applications distributed across a VPC and on-premises location?

<p>Add them to the same target group using their IPs or use separate groups for routing.</p> Signup and view all the answers

For Application Load Balancers, how can I load balance to EC2-Classic instances?

<p>False (B)</p> Signup and view all the answers

How do I enable cross-zone load balancing in Application Load Balancer?

<p>True (A)</p> Signup and view all the answers

When should I authenticate users using the Application Load Balancer's integration with Amazon Cognito?

<p>When you need flexibility with multiple identity providers or social authentication.</p> Signup and view all the answers

What type of redirects does ALB support?

<p>HTTP to HTTP, HTTP to HTTPS, and HTTPS to HTTPS.</p> Signup and view all the answers

What content types does ALB support for the message body of fixed-response action?

<p>text/plain, text/css, text/html, application/javascript, application/json.</p> Signup and view all the answers

How does Application Load Balancer pricing work?

<p>Billed for hours running and Load Balancer Capacity Units (LCU) used per hour.</p> Signup and view all the answers

What is a Application Load Balancer Load Balancer Capacity Unit (LCU)?

<p>LCU defines the max resource consumed based on new connections, active connections, bandwidth, and rule evaluations.</p> Signup and view all the answers

Will I be billed on Classic Load Balancers by LCU?

<p>False (B)</p> Signup and view all the answers

How do I know the number of LCUs an Application Load Balancer is using?

<p>Usage is exposed via CloudWatch.</p> Signup and view all the answers

Will I be billed on all the dimensions in an LCU?

<p>False (B)</p> Signup and view all the answers

Will I be billed on partial LCUs?

<p>True (A)</p> Signup and view all the answers

Is a free tier offered on an Application Load Balancer for new AWS accounts?

<p>True (A)</p> Signup and view all the answers

Can I use a combination of Application Load Balancer and Classic Load Balancer as part of my free tier?

<p>True (A)</p> Signup and view all the answers

What are rule evaluations?

<p>Defined as the product of number of rules processed and the request rate averaged over an hour.</p> Signup and view all the answers

How does the LCU billing work with different certificate types and key sizes?

<p>Certificate key size affects only new connections per second in LCU computation.</p> Signup and view all the answers

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Study Notes

Load Balancers Overview

  • Elastic Load Balancing offers three types: Application Load Balancer (ALB), Network Load Balancer (NLB), and Classic Load Balancer (CLB).
  • Choose ALB for flexible application management and TLS termination; NLB for extreme performance and static IP; CLB for applications built within EC2 Classic network.

Private Access and Security

  • Elastic Load Balancing APIs can be accessed privately via VPC Endpoints without public IPs.
  • Internal load balancers utilize only private IP addresses, limiting routing to clients within the VPC.

Application Load Balancer (ALB) Features

  • ALB supports any operating system compatible with Amazon EC2.
  • Load balancing protocols include HTTP and HTTPS, with native support for HTTP/2 and WebSockets.
  • Supports TCP port range of 1-65535 for load balancing.

SSL and Security Features

  • HTTPS termination on ALB requires an installed SSL certificate.
  • AWS Certificate Manager (ACM) simplifies SSL/TLS certificate handling and integration with ALB.

Load Balancer Management

  • Manage ALBs and CLBs simultaneously via the ELB Console; different CLI commands are used for each.
  • Limitation on resource configuration includes 20 load balancers and various grouping and listener restrictions.

Migration and Compatibility

  • Existing CLBs do not have feature parity with ALBs; migration possible from CLB to ALB but not vice versa.
  • ALB cannot be used as a Layer-4 load balancer; NLB is recommended for Layer-4 features.

Network and Communication

  • Supports IPv6, cross-zone load balancing is enabled by default.
  • Content-based routing allows for diverse application scenarios, including hybrid environments with both VPC and on-premises locations.

Authentication and User Management

  • ALB integrates with Amazon Cognito for user authentication, allowing the use of multiple identity providers including social media accounts.

Redirection and Messaging

  • ALB supports various types of URL redirection: HTTP to HTTP, HTTP to HTTPS, and HTTPS to HTTPS.
  • Fixed-response actions are limited to specific content types like text/html and application/json.

Pricing and Resource Management

  • Pricing for ALB is based on hourly usage and Load Balancer Capacity Units (LCUs).
  • An LCU measures maximum resource consumption across connections and evaluations, with a free tier available for new accounts for up to 12 months.
  • Rule evaluations are calculated based on the number of rules processed and request rates.

General Guidelines

  • To protect applications, integrate ALB with AWS WAF for web application firewall capabilities.
  • Enabling Server Name Indication (SNI) occurs automatically when multiple TLS certificates are configured on a secure listener.

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