AWS Course: Network ACL's Explained
In this tutorial, we discuss Network Access Control Lists, a type of firewall for AWS.
✅ FREE GUIDE: https://dl.dropboxusercontent.com/scl...
SUMMARY:
A Network ACL (NACL) is a Subnet-level firewall
A NACL is simply a list of rules: for Outbound and Inbound traffic
Each VPC has a Default NACL and can have multiple Custom NACLs
These NACL's are then assigned to (“associated with”) Subnets
Each Subnet has to be associated with exactly one NACL
Each NACL can be associated with any number of Subnets
Note: a NACL cannot be attached to an individual resource (unlike a Security Group)
NACL's affect all traffic that crosses the Subnet boundary NACLs do not affect traffic flow within the same subnet
NACL's are stateless firewalls, i.e. they treat Responses like they treat any other traffic
NACLs can contain explicit denies (useful for blocking malicious users, websites and networks)
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