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Networking

This section contains information about networking in AWS.

Tips

  • VPCs in General
  • know the pros and cons of each On-prem to AWS connection mode
  • know the functions of each VPC component
  • Know what is meant by:
    • stateful: the firewall remembers the state of the connection
    • stateless: the firewall does not remember the state of the connection
    • connectionless: the firewall does not remember the state of the connection
    • connection-based: the firewall remembers the state of the connection
  • Routing
    • Understand BGP and how to use weight to influence routing
    • know how route table are prioritized
    • what other routing protocols are supported by AWS
  • VPC peering
    • CIDR block overlap
    • After VPC owner accepts a peering request, routes must be added to route tables
    • Transitive peering is not supported
    • A transit VPC is supported
  • Internet Gateways
    • Difference between NAT instance and NAT gateway
    • Internet gateway is horizontally scaled and redundant
    • NATs do have bandwidth limitations
    • VPCs can use multiple NAT gateways
    • Use Egress-Only Internet Gateway for IPv6
  • Route53
    • Understand the difference between a hosted zone and a domain
    • Know the Weighted Routing Policy
    • Route53 is a global service
  • CloudFront
    • Understand the difference between an origin and a distribution
    • Know the difference between a web distribution and a RTMP distribution
    • Understand the difference between a cache hit and a cache miss
  • Elastic Load Balancer
    • Know the difference between an Application Load Balancer and a Classic Load Balancer
    • Know the difference between a Network Load Balancer and a Classic Load Balancer
    • Know the difference between a Layer 4 and a Layer 7 Load Balancer