VPC Basics Flashcards
T or F: A VPC is created in an availability zone.
F
What is a subnet?
A subnetwork of the VPC
Can a subnet be in more than one Availability Zone?
No
Can an availability zone have more than one subnet?
Yes, but that sounds like a bad idea
Which IP addresses are reserved in a subnet CIDR?
First 4, then last one
What is important about the first IP address of a subnet’s CIDR?
This is the IP of the network address that routes subnet traffic.
What is the DHCP Options Set?
Configuration that applies to VPC.
What is the purpose of the VPC Router?
Routes traffic between subnets
Why is the VPC router considered highly available?
It runs in all availability zones that the VPC operates in
How is priority decided in a VPC route table?
More specific the IP range is, the higher peiority is given to routing. In addition, anything “local” ie within VPC given highest priority.
What is internet gateway used for?
Route traffic between vpc and internet or aws public zone
What is the bastion host used for?
The bastion host routes management traffic to access internal VPC resources
True or false: A NACL controls traffic in and out of instances
False. A NACL controls traffic in and out of subnets
Are connections within a subnet impacted by a NACL?
No
Why does every connection need an inbound and outbound rule when using a NACL?
NACLs are stateless and don’t maintain anything about the connection
