A user has setup a VPC with CIDR 20.0.0.0/16. The VPC has a private subnet (20.0.1.0/24. and a public
subnet (20.0.0.0/24.. The user’s data centre has CIDR of 20.0.54.0/24 and 20.1.0.0/24. If the private subnet
wants to communicate with the data centre, what will happen?
A.
It will allow traffic communication on both the CIDRs of the data centre
B.
It will not allow traffic with data centre on CIDR 20.1.0.0/24 but allows traffic communication on
20.0.54.0/24
C.
It will not allow traffic communication on any of the data centre CIDRs
D.
It will allow traffic with data centre on CIDR 20.1.0.0/24 but does not allow on 20.0.54.0/24
Explanation:
VPC allows the user to set up a connection between his VPC and corporate or home network data centre. If the
user has an IP address prefix in the VPC that overlaps with one of the networks’ prefixes, any traffic to the
network’s prefix is dropped. In this case CIDR 20.0.54.0/24 falls in the VPC’s CIDR range of 20.0.0.0/16. Thus, it
will not allow traffic on that IP. In the case of 20.1.0.0/24, it does not fall in the VPC’s CIDR range. Thus, traffic
will be allowed on it.
C is correct.
VPC’s CIDR range = 20.0.0.1 ~ 20.0.255.254
oh.. I was wrong.
D is correct.
D is correct
d
Correct answer is D
VPC allows the user to set up a connection between his VPC and corporate or home network data centre. If the user has an IP address prefix in the VPC that overlaps with one of the networks’ prefixes, any traffic to the network’s prefix is dropped. In this case CIDR 20.0.54.0/24 falls in the VPC’s CIDR range of 20.0.0.0/16. Thus, it will not allow traffic on that IP. In the case of 20.1.0.0/24, it does not fall in the VPC’s CIDR range. Thus, traffic will be allowed on it.