Interview

Aws Load Balancer Interview Questions

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Today’s modern world is witnessing a significant change in how businesses and organizations work. Everything is getting digitized, and the introduction of cloud and cloud computing platforms have been a major driving force behind this growth. Today, most businesses are using or are planning to use cloud computing for many of their operations, which consequently has led to a massive surge in the need for cloud professionals.Â

If you are interested in a career in the cloud industry, your chance has arrived. With cloud computing platforms like AWS taking the present business scenarios by storm, getting trained and certified in that particular platform can provide you with great career prospects.Â

But in order to get your AWS career started, you need to set up some AWS interviews and ace them. In the spirit of doing that, here are some AWS interview questions and answers that will help you with the interview process. There are a number of different AWS-related questions covered in this article, ranging from basic to advanced, and scenario-based questions as well.

How AWS Elastic Load Balancing Works?A load balancer accepts incoming traffic from clients and routes requests to its registered targets (such as EC2 instances) in one or more Availability Zones. The load balancer also monitors the health of its registered targets and ensures that it routes traffic only to healthy targets. When the load balancer detects an unhealthy target, it stops routing traffic to that target. It then resumes routing traffic to that target when it detects that the target is healthy again. A listener is a process that checks for connection requests. It is configured with a protocol and port number for connections from clients to the load balancer. Likewise, it is configured with a protocol and port number for connections from the load balancer to the targets.

  • Application Load Balancers – It allows a developer to configure and route incoming end-user traffic to applications based in the Amazon Web Services (AWS) public cloud.It pushes traffic across multiple targets in multiple AWS Availability Zones.
  • Network Load Balancers – The Network Load Balancing feature distributes traffic across several servers by using the TCP/IP networking protocol.It works by combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers.
  • Gateway Load Balancers – GLB enable you to deploy, scale, and manage virtual appliances, such as firewalls, intrusion detection and prevention systems, and deep packet inspection systems. A Gateway Load Balancer operates at the third layer of the Open Systems Interconnection (OSI) model, the network layer.
  • Classic Load Balancers – It provides basic load balancing across multiple Amazon EC2 instances and operates at both the request level and connection level. Classic Load Balancer is intended for applications that are built within the EC2-Classic network.

    • What is Elastic Load Balancer (ELB)?Elastic Load Balancing (ELB) is a load-balancing service for Amazon Web Services (AWS) deployments. ELB automatically distributes incoming application traffic and scales resources to meet traffic demand.It also helps an IT team adjust capacity according to incoming application and network traffic.Load balancing divides the amount of work that a computer has to do among multiple computers so that users, in general, get served faster. ELB offers enhanced features including: Detection of unhealthy Elastic Compute Cloud (EC2) instances. Spreading instances across healthy channels only. Flexible cipher support. Centralized management of Secure Sockets Layer (SSL) certificates. Optional public key authentication. Support for both IPv4 and IPv

  • High availability
  • The most well-known service that relies on ELB is Amazons EC2, as ELB performs a health check to ensure an instance is still running before sending traffic to it. When an instance fails or is unhealthy, ELB routes traffic to the remaining healthy EC2 instances. If all EC2 instances in a particular availability zone are unhealthy, ELB can route traffic to other availability zones until the original instances restore to a healthy state.
  • Automatic scaling
  • A developer can use AWS Auto Scaling feature to guarantee he or she has enough EC2 instances running behind an ELB. The developer sets Auto Scaling conditions, and when a condition is met, a new EC2 instance can spin up to meet the desired minimum. A developer can also set a condition to spin up new EC2 instances to reduce latency.
  • Security
  • ELB supports applications within an Amazon Virtual Private Cloud for stronger network security. An IT team can specify whether it wants an internet-facing or internal load balancer. The latter option enables a developer to route traffic through an ELB using private IP addresses. A developer could also route traffic between different tiers of an application by using multiple internet-facing and internal load balancers; this approach allows an IT team to use a security group along with private IP addresses while exposing only the web-facing tier and its public IP addresses.

    • 1 How do you set up a system to monitor website metrics in real-time in AWS?

    Amazon CloudWatch helps you to monitor the application status of various AWS services and custom events. It helps you to monitor:

  • State changes in Amazon EC2
  • Auto-scaling lifecycle events
  • Scheduled events
  • AWS API calls
  • Console sign-in events

    • 11 Elastic Load Balancer Interview Questions and Answers with Example

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