AWS Load Balancer

1. What is AWS load balancer?
2. What is the difference between ELB and ALB?
3. What is ALB vs ELB in AWS?
4. What is Layer 7 vs Layer 4 load balancer?
5. How does a Loadbalancer work?
6. What is ELB and Autoscaling?
7. What is difference between ALB and NLB?
8. What is the difference between Route 53 and ELB?
9. Can ALB replace API gateway?
10. Should I use alb or API gateway?
11. Which load balancer method is best?
12. Why load balancer is required?
13. Is load balancer same as firewall?
14. What does a cloud load balancer do?
15. Does AWS need load balancer?
16. Is load balancer a server?
17. Which load balancer method is best?
18. What is the disadvantage of using load balancers?

What is AWS load balancer?

A load balancer serves as the single point of contact for clients. The load balancer distributes incoming application traffic across multiple targets, such as EC2 instances, in multiple Availability Zones. This increases the availability of your application. You add one or more listeners to your load balancer.

What is the difference between ELB and ALB?

One of the most significant differences between ALB and ELB lies in the system of their routing process. While ELB only routes traffic based on routing number, ALB facilitates context-driven routing based on multiple references, including query string perimeter, source IP, port number, hostname, and path.

What is ALB vs ELB in AWS?

ELB works at both layer 4 (TCP) and 7 (HTTP) and is the only load balancer that works in EC2-Classic, in case you have a very old AWS account. Also, it's the only load balancer that supports application-defined sticky session cookies; in contrast, ALB uses its own cookies, and you have no control over that.

What is Layer 7 vs Layer 4 load balancer?

The differences between Layer 4 and Layer 7 Load Balancing are: Layer 4 uses only TCP connection from client to the server while layer 7 uses two TCP connections from client to the server. Layer 7 has application awareness whilst layer 4 only has on network and application ports.

How does a Loadbalancer work?

A load balancer acts as the “traffic cop” sitting in front of your servers and routing client requests across all servers capable of fulfilling those requests in a manner that maximizes speed and capacity utilization and ensures that no one server is overworked, which could degrade performance.

What is ELB and Autoscaling?

The ELB allows you to dynamically manage loads across your resources based upon target groups and rules whereas EC2 auto scaling allows you to elastically scale those target groups based upon the demand put upon your infrastructure. However, one without the other can cause an operational burden.

What is difference between ALB and NLB?

ALB supports HTTP, HTTPS, TCP, and SSL, while NLB supports TCP, TLS, and UDP. Both ALB and NLB are available on a pay-per-use basis, but the pricing may vary depending on the specific features and usage patterns of your application.

What is the difference between Route 53 and ELB?

ELB distributes traffic among Multiple Availability Zone but not to multiple Regions. Route53 can distribute traffic among multiple Regions. In short, ELBs are intended to load balance across EC2 instances in a single region whereas DNS load-balancing (Route53) is intended to help balance traffic across regions.

Can ALB replace API gateway?

The answer is yes and, in many cases, they are substitutes for each other. But how should we choose which one to use? In this article, we will dive into more details on how these two types of HTTP networking services compare, using the AWS services as a base level: API Gateway and Application Load Balancer (ALB).

Should I use alb or API gateway?

Pricing. Also, as we discussed previously, ALBs rule when it comes to cost at scale. API Gateway is more affordable than ALB for up to around 500,000 monthly transactions. But at larger scales, API Gateway's costs quickly accumulate, and ALB becomes the much more affordable solution.

Which load balancer method is best?

Round-robin load balancing is the simplest and most commonly-used load balancing algorithm.

Why load balancer is required?

Load balancing lets you evenly distribute network traffic to prevent failure caused by overloading a particular resource. This strategy improves the performance and availability of applications, websites, databases, and other computing resources. It also helps process user requests quickly and accurately.

Is load balancer same as firewall?

A load balancer is a firewall in its own right. Of course, so-called security professionals might feel threatened about their livelihoods being attacked and claim you need a firewall (and their services) anyway--but that's a policy problem, not a technical problem.

What does a cloud load balancer do?

A load balancer distributes user traffic across multiple instances of your applications. By spreading the load, load balancing reduces the risk that your applications experience performance issues.

Does AWS need load balancer?

If extreme performance and static IP is needed for your application, we recommend that you use a Network Load Balancer. If you have an existing application that was built within the EC2-Classic network, then you should use a Classic Load Balancer.

Is load balancer a server?

A load balancer acts as a 'reverse-proxy' to represent the application servers to the client through a virtual IP address (VIP). This technology is known as server load balancing (SLB).

Which load balancer method is best?

Round-robin load balancing is the simplest and most commonly-used load balancing algorithm.

What is the disadvantage of using load balancers?

It is likely to experience issues with performance, availability, and economics. To handle more traffic, we have to enhance the processing capability. This can be achieved either by scaling up or scaling out. However, a server may fail at times and the cost of using a machine may be huge even to afford.