Task Statement 1.3: Design solutions that integrate load balancing to meet high availability, scalability, and security requirements.

📘AWS Certified Advanced Networking – Specialty

Design solutions that integrate load balancing to meet high availability, scalability, and security requirements

Knowledge Area: Integrations of Load Balancers and Other AWS Services

In the AWS Certified Advanced Networking – Specialty exam, you must understand how AWS load balancers integrate with other AWS services to build highly available, scalable, and secure architectures.

Load balancers rarely operate alone. In real AWS architectures, they are usually integrated with other AWS networking, security, and application services.

The main integrations you should understand are:

AWS Global Accelerator
Amazon CloudFront
AWS WAF
Amazon Route 53
Amazon Elastic Kubernetes Service (Amazon EKS)
AWS Certificate Manager (ACM)

Before learning these integrations, you should understand the role of AWS load balancers.

1. AWS Load Balancers Overview

AWS provides several load balancing services under Elastic Load Balancing (ELB):

Application Load Balancer (ALB)

Used for:

HTTP
HTTPS
Layer 7 routing
Microservices and containers

Features:

Path-based routing
Host-based routing
WebSocket support
Integration with Kubernetes and containers

Network Load Balancer (NLB)

Used for:

TCP
UDP
TLS
Layer 4 traffic

Features:

Ultra-low latency
Handles millions of requests
Static IP addresses
Suitable for high-performance applications

Gateway Load Balancer (GWLB)

Used for:

Security appliances
Firewall integration
Network traffic inspection

Example appliances:

Intrusion detection systems
Network firewalls
Traffic inspection platforms

2. Integration with AWS Global Accelerator

What Global Accelerator Does

AWS Global Accelerator improves:

Global performance
Availability
Failover

It uses the AWS global edge network to route traffic to the closest AWS region.

Instead of users connecting directly to a load balancer, they connect to Global Accelerator static IP addresses.

Architecture Flow

Client → Global Accelerator → Load Balancer → Application Servers

The load balancer may be:

Application Load Balancer
Network Load Balancer

Key Benefits

1. Static Anycast IP Addresses

Global Accelerator provides two static IP addresses.

This helps when:

Applications require fixed IPs
Firewall allow lists require static IPs

2. Fast Global Routing

Traffic enters the nearest AWS edge location and travels through the AWS backbone.

Benefits:

Lower latency
More reliable network paths

3. Multi-Region Failover

Global Accelerator can route traffic to multiple regions.

Example architecture:

Region 1
ALB → EC2 instances

Region 2
ALB → EC2 instances

If Region 1 fails:
Global Accelerator automatically routes traffic to Region 2.

Exam Key Points

Know that Global Accelerator sits in front of load balancers and provides:

static IPs
global routing
multi-region failover
improved performance

3. Integration with Amazon CloudFront

What CloudFront Does

Amazon CloudFront is a Content Delivery Network (CDN).

It caches content at edge locations close to users.

CloudFront can use a load balancer as its origin.

Architecture Flow

Client → CloudFront → Application Load Balancer → Application servers

Benefits

1. Reduced Load on Backend Servers

Static content is cached at edge locations.

Examples:

images
CSS files
JavaScript
software downloads

This reduces requests reaching the load balancer.

2. Lower Latency

Users access content from the nearest edge location.

3. DDoS Protection

CloudFront integrates with:

AWS Shield
AWS WAF

This protects backend load balancers.

Example IT Architecture

Web application hosted in AWS:

CloudFront distribution
→ Application Load Balancer
→ EC2 instances

CloudFront caches static files while ALB handles dynamic application requests.

Exam Key Points

Remember:

CloudFront can use ALB or NLB as the origin.

CloudFront provides:

caching
global edge delivery
DDoS protection
TLS termination

4. Integration with AWS WAF

What AWS WAF Does

AWS WAF (Web Application Firewall) protects web applications from:

SQL injection
Cross-site scripting
malicious HTTP requests
bot traffic

Where WAF Can Be Attached

AWS WAF can protect:

Application Load Balancer
CloudFront
API Gateway
AppSync

Architecture Flow

Client → WAF → Application Load Balancer → Application servers

Security Filtering

WAF inspects HTTP requests before they reach the load balancer.

It can block:

malicious IP addresses
suspicious request patterns
bots
attack signatures

Example IT Use Case

An organization runs a web portal on EC2 behind an ALB.

AWS WAF is attached to the ALB to block:

SQL injection attacks
HTTP flood attacks
known malicious IP ranges

Exam Key Points

Remember:

WAF protects Layer 7 applications
Works with ALB and CloudFront
Filters requests before they reach backend services

5. Integration with Amazon Route 53

What Route 53 Does

Amazon Route 53 is AWS’s DNS service.

It maps domain names to AWS resources.

Common Integration

Route 53 can route traffic directly to:

Application Load Balancer
Network Load Balancer

Using Alias records.

Architecture Flow

Client → Route 53 DNS → Load Balancer → Application servers

Route 53 Routing Policies

Simple Routing

One load balancer endpoint.

Weighted Routing

Traffic split between multiple load balancers.

Example:

ALB 1 → 70% traffic
ALB 2 → 30% traffic

Used for:

canary deployments
gradual application rollout

Latency Routing

Traffic goes to the region with the lowest latency.

Example:

User in Asia → ALB in Singapore
User in Europe → ALB in Frankfurt

Failover Routing

Used for disaster recovery.

Primary ALB
Secondary ALB

If health checks fail, Route 53 sends traffic to the secondary.

Exam Key Points

Route 53 is used to:

direct users to load balancers
perform DNS-based failover
implement multi-region routing

6. Integration with Amazon Elastic Kubernetes Service (EKS)

What Amazon EKS Does

Amazon EKS is a managed Kubernetes service.

It runs containerized applications.

Kubernetes uses services to expose applications.

How Load Balancers Are Created

In EKS, a Kubernetes Service of type LoadBalancer automatically creates an AWS load balancer.

Example:

Kubernetes service
→ creates an Application Load Balancer or Network Load Balancer

ALB Ingress Controller

The AWS Load Balancer Controller integrates Kubernetes with ALB.

It allows:

path-based routing
host-based routing
dynamic load balancer creation

Architecture Flow

Client → Application Load Balancer → Kubernetes Pods (EKS)

Benefits

automatic scaling
dynamic service discovery
Kubernetes-native integration

Example IT Scenario

A microservices platform running on EKS.

Each service is exposed through an ALB ingress.

The ALB routes traffic based on URL paths:

/api → API service pods
/auth → authentication service pods

Exam Key Points

Understand:

EKS integrates with ALB and NLB
Kubernetes LoadBalancer service type creates AWS load balancers
AWS Load Balancer Controller manages ALB integration

7. Integration with AWS Certificate Manager (ACM)

What ACM Does

AWS Certificate Manager manages SSL/TLS certificates.

Certificates are used to secure HTTPS connections.

Integration with Load Balancers

ALB and NLB can use certificates stored in ACM.

The load balancer performs TLS termination.

Architecture Flow

Client (HTTPS)
→ Load Balancer with ACM certificate
→ Backend application servers

Benefits

1. Simplified Certificate Management

ACM handles:

certificate issuance
renewal
deployment

2. Secure Communication

Encrypted connections using HTTPS.

3. Offloading TLS Processing

Load balancer handles encryption instead of application servers.

This reduces backend server CPU load.

Example IT Use Case

A public web application requires HTTPS.

Steps:

Certificate created in ACM
Attached to Application Load Balancer
ALB terminates HTTPS connections

Backend servers receive HTTP traffic.

Exam Key Points

Remember:

ACM provides certificates for:

ALB
NLB
CloudFront

Load balancers use ACM to enable HTTPS listeners.

8. Combined Architecture (Typical Exam Scenario)

A modern AWS architecture may combine several services:

Client
→ Route 53 DNS
→ CloudFront CDN
→ AWS WAF
→ Application Load Balancer
→ EKS cluster or EC2 instances

Optional global routing:

Client
→ Global Accelerator
→ ALB in multiple regions

Security:

ACM certificates used for HTTPS.

9. Important Exam Summary

You must understand the role of each service when integrated with load balancers.

Service	Purpose with Load Balancer
Global Accelerator	Global traffic routing and failover
CloudFront	CDN caching and edge delivery
AWS WAF	Application layer security
Route 53	DNS routing and failover
Amazon EKS	Container workload integration
ACM	SSL/TLS certificate management

✅ Key Concept for the Exam

Load balancers act as the central traffic distribution layer, while other AWS services provide:

global routing
DNS resolution
caching
security filtering
container integration
TLS encryption

Together they create highly available, scalable, and secure application architectures.