VPC Overview Flashcards
What is a VPC?
A logically isolated section the cloud
True or false: You have complete control over the networking including IP addresses, creating subnets, and configuring route tables?
True
True or false: you can create a hardware VPN connection between your corporate data center and your VPC, allowing you to leverage AWS cloud as an extension of your corporate data center?
True
Which three internal private IP ranges does AWS support?
- 0.0.0 - 10.255.255.255 (10/8 prefix)
- 16.0.0 - 172.31.255.255 (172.16/12 prefix)
- 168.0.0 - 192.168.255.255 (192.168/16 prefix)
What website can you use to help calculate the CIDR range you should use in your networks?
CIDR.xyz
What is the default maximum number of VPC’s you can have in a region?
5
Can you increase the default number of VPCs in a region?
Yes, by opening a case with AWS
If you require more IP addresses than your current VPC supports, how can you create more?
You have to create a new VPC, so plan ahead.
Where do CIDR addresses get applied?
When you create a subnet
Can a subnet span availability zones?
No. One subnet, one availability zone.
Where are subnets applied?
Availability Zones
Can you create more than one internet gateway in a VPC?
No, each VPC can be allocated one IG
True or false: You should always plan for high availability with internet gateways by implementing at least two per VPC?
False: You can only attach one internet gateway per VPC. Internet gateways are an AWS managed service and have high availability built in.
True or false: Like subnets, security groups are locked to one availability zone?
False: Security groups can span availability zones.
True or false: With a custom VPC, you can launch instances into the subnet of your choice?
True
True or false: With a custom VPC, you can assign custom IP address ranges in each subnet?
True
True or false: With a custom VPC, you can configure route tables between subnets?
True
True or false: With a custom VPC, you can attach an internet gateway to your VPC?
True
True or false: With a custom VPC, you can have much better security control over your AWS resources?
True
True or false: With a custom VPC, you can use instance security groups?
True
True or false: With a custom VPC, you can use subnet access control lists?
True
Can you block IP addresses with a subnet access control list?
Yes
True or false: With the AWS default VPC, all instances require an internet gateway for access to the internet?
False: All subnets in a default VPC have a route to the internet.
True or False: Instances in a default VPC have only a public IP address?
False: Instances in a default VPC have both a public and a private IP address