VPC’s Flashcards
What is the method for allocating IP’s called?
Classless Inter-Domain Routing (CIDR)
What defines how many bits can change in the IP?
A subnet mask
What is the max number of VPC’s you can have in an AWS region?
5
What is the max number of CIDR’s you can assign per VPC?
5
AWS reserves ____ in each subnet.
5 IP addresses (first 4 & last 1)
What allows resources in a VPC to connect to the internet?
An Internet Gateway (IGW)
Internet gateways on their own do not allow Internet access, what also must be edited?
The route tables
We can use __________ to SSH into our private EC2 instances
Bastion Host
Where is the Bastion Host located?
The public subnet
For a Bastion host, the security group MUST allow?
Access from the Internet on port 22 from a restricted CIDR
What does NAT stand for?
Network Address Translation
What allows EC2 instances in private subnets to connect to the Internet?
NAT Gateways
Where must the NAT Instance be launched?
In a public subnet
What setting must be disabled in NAT instance?
Source/destination check
What must a NAT Instance have attached to it?
An Elastic IP
