AWS Basic Networking Flashcards
(22 cards)
Smallest CIDR block size used in a VPC?
/28
Largest CIDR block size used in a VCP?
/16
How many IP addresses reserved by a VPC?
5 addresses
What is a VPC?
A logically isolated network dedicated to your AWS account
VPCs belong to a single AWS ______ and can span multiple _______ _____.
(HINT: Geography)
Region; availability zones
For what purpose does AWS reserve the very first IP address in a subnet?
Network address
What is the function of the second IP address in a VPC subnet?
Internal communication
What is the function of the third IP address in a VPC subnet?
DNS resolution
What is the purpose of the fourth IP address in a VPC subnet?
Reserved for future use
What is the purpose of the last IP address in a VPC subnet?
Network broadcast address
Which public IP address can be allocated and remapped anytime in AWS?
Elastic IP address
Each subnet must be associated with a _____ table.
Route
By default, what must every route table contain in order to communicate within the VPC?
A local route
What is a route table?
A set of rules that are configured to direct network traffic
What two things make up a route table?
A destination and a target
What two purposes does an AWS VPC internet gateway serve?
- Provide a target in your VPC route tables for internet-routable traffic
- To perform network address translation for instances that have public IPv4 addresses
Two types of AWS VPC endpoints?
- Gateway endpoints
2. Interface endpoints
Advantage of NAT gateway over a NAT instance in a public subnet?
Better availability
Higher bandwidth
Less administrative overhead
What does the route table target “pcx-id” represent?
Ex: pcx-11112222
A VPC peering connection
What are VPC endpoints used for?
Connecting a VPC to supported AWS services while remaining private traffic.
Network ACLs are associated to ________.
Subnets
Security groups are applied on the _____________ level.
Instance
