A user has created an ELB with three instances. How many security groups will ELB create by default?
A.
3
B.
5
C.
2
D.
1
Explanation:
Elastic Load Balancing provides a special Amazon EC2 source security group that the user can use to ensure
that back-end EC2 instances receive traffic only from Elastic Load Balancing. This feature needs two security
groups: the source security group and a security group that defines the ingress rules for the back-end
instances. To ensure that traffic only flows between the load balancer and the back-end instances, the user can
add or modify a rule to the back-end security group which can limit the ingress traffic. Thus, it can come only
from the source security group provided by Elastic load Balancing.
Answer – C
http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/elb-security-groups.html#elb-vpc-security-groups
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Answer is D.
From the docs Ratna linked: “Elastic Load Balancing creates only one such security group per AWS account”
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Agree. Subsequent load balancers that you create in the default VPC also use this security group.
0
0
D
0
0
C
2 (One for ELB to allow inbound and Outbound to listener and health check port of instances and One for the Instances to allow inbound from ELB)
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D
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-security-groups.html
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ans : D
One security group is enough .But the inbound and out bound rule configured as per the link
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-security-groups.html#elb-vpc-security-groups
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D
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c
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c
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Answer is D, when you creating an ELB you can assign more than one security group but one is enough.
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Question is not quite clear. If we look at “How many security groups will ELB create by default?”
Answer would be 1 security group, either it can use default or user created security group.
I think answer might be D.
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D is correct. The question is incomplete. http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-security-groups.html
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C
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I was wrong, the answer for EC2-Default is one security group is created by default.
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Answer is C:
2 (One for ELB to allow inbound and Outbound to listener and health check port of instances and One for the Instances to allow inbound from ELB)
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C
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C
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D…
C only applies with the EC2 classic
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