Describe the differences between static NAT, dynamic NAT, and NAT overload.

Describe the differences between static NAT, dynamic NAT, and NAT overload.

Static NAT:

• Static NAT uses a one-to-one mapping of local and global addresses, and these mappings remain constant.
• Static NAT is particularly useful for web servers or in general hosts that must have a consistent address that is accessible from the Internet.

Dynamic NAT:

• Dynamic NAT uses a pool of public addresses and assigns them on a first-come, firstserved basis.
• When a host requests access to the Internet, dynamic NAT chooses an IP address from the public pool and temporarily binds it with the internal local address.

NAT Overload:

• NAT overloading (sometimes called Port Address Translation or PAT) maps inside local IP addresses to a combination of a global IP address and a unique port number.
• When a response returns to the NAT router, the router examines the source port number and forwards the packet to the originating inside local address.
• It also validates that the incoming packets were requested, thus adding a degree of security to the session.

Exam with this question: EWAN v4 Chapter 7 Check Your Understanding: IP Addressing Services