Load balancer interview Questions:

 Load balancer interview Questions:

Load balancer Interview Questions from server gyan 



1).How do you select load balancer for your application 

requirement ?


we have three types of load balancer . 


application load balancer


network load balancer


gateway load balancer


base on their needs and requirements we have to choose those load balancers 



2).which protocol does application elb support?


http and https 


3)what are the steps to enable the http2 protocol on the 

top of elb?


go to the load balancer which we are created before.


under the loadbalnacer we have to see the options called as the descriptions


here we have to see the attributes 


edit the attributes if u want :


here we can see the http2 protocol version


if you want we can enable or disable it 


by default http2 is enabled on load balancer.


delete protections 

access logs 

mitigation mode 

drop invalid header fields


4).does elb support stateful applications?

yes its support . 


what is the stateful and stateless ?


5).what are the steps to add ssl certificate with elb?


go to the load balancer which we are created .



we will go to add lisnter tab


here we have to choose the https protocol


here we can see the,


default actions 


here choose the target : where the request is forsted


to which url


default ssl certificate :


we cn create the certificate from iam and acm and u imported if its required


6).can i associate ssl certificate from iam with elb?

yes we can upload it .


while uploading the ssl certificate we can upload it from iam as well


7).can i associate multiple ssl cert with elb?

yes .bydeafult we can associate the multiple ssl certificate into elb 


based on the domain name which will be forward to the loadbalnacer so appoatre certificate will be asociated 

by loadbalnacer wiht the particular request


8).can i return fix response from elb?


yes 


go to add listener tab


go to edit rules


add the new rules here


then choose host header name (www.abc.com)

if you want we can add another rule here


go and choose the path 


return fixed response :


then return and fix response 


response code would be the 443


response busy .u are a wrong page 


if someone tryng to access the page , then it will shows 

the messages like as the ,


u are in a wrong page 


9).does elb support ssl terminations?


yes 


load balancer here 


u have couple of target group it will be there


this load balancer will accept the traffic port number 443

with the help of ssl terminations mechanism ,what we will do its can be  forward to the request to the 


server . whenever the server will respond back 


then loadbalnacer will respond the back 443 port only


that's knows as ssl terminations

this only we can do it



10).how can i protect my webservers running behind elb?


ssl , waf ans shiled services without public ipaddress


then we can add the config services 



11).what is layer 4 and layer7?


layer 4 == nlb


layer 7 ==alb







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