August 2018
Beginner
358 pages
10h 27m
English
Content preview from Cloud Native Architectures
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Network firewalls
Security groups (SGs) and NACLs act as firewalls for virtual machines in your cloud network plane. SGs act at the machine network interface (NI) and are generally more flexible and useful in day-to-day deployments. SGs can be modified on the fly and rules cascade down to all NIs within the group. SGs by default restrict all incoming traffic (except from other machines in the same SG) and allow all outbound traffic. NACLs are similar, but are applied across a whole subnet and by default allow all traffic.
A detailed comparison between SGs and NACLs is made in the following table:
|
SGs |
NACLs |
|
Operates at the instance level (first layer of defense) |
Operates at the subnet level (second layer of defense) |
|
Supports ... |
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