A company is running a microservices

application with multiple back-end

services. They want to use a single

application load balancer to distribute

traffic to different target groups based

on the URL path in the request. For

example, requests to SL API star should

go to API service target group and

requests to the /webstar should go to

the web front-end target group. So,

which features should the solutions

architect configure to meet this

requirement? Let's identify the key

hints. Application load balancer. So

this is a layer 7 load balancer, right?

Route based on URL path. So we're going

to need to be able to inspect the HTTP

content and a single load balancer that

supports multiple services. So these are

our hints. So option one, configure the

listener rules with pathbased routing

conditions based on the application load

balancer. So we're going to use an

application load balancer. Option two,

deploy a network load balancer and

configure multiple listeners on

different ports for each service. Option

three, create separate application load

balancers for each microser and use

route 53 weighted routing to kind of do

the routing. Option four, implement

client side service discovery and

routing logic in the application code.

Leave your answer in the comments below.

Now, our hint says that URL path

routing, so that means inspecting HTTP

content, which means layer 7. Now, a

network load balancer, if we looked at

the options, is layer 4. It can't

actually see URL patterns. It's out.

Separate ALBs could work, but our hint

says a single load balancer and also

that will probably be more expensive.

Three client side routing pushes

complexity to the application which AWS

typically doesn't go for has an answer.

So the correct answer is ALB listener

rules with pathbased routing. Remember

ALB is layer 7. It can expect HTTP

content including URL paths. Plus

listener rules will route to slash API

for one target group and it will route

SLeb to another. One ALB multiple

services matches all of our hints. And

remember NLB equals layer 4 fast but

blind to HTTP. An ALB or application

load balancer that's a layer 7 router.

It's going to tell is it routing.