Which translation technology would typically be used at home, especially for connecting devices such as tablets, phones, and PCs through a cable internet connection?
- static NAT
- dynamic NAT
- PAT
- double NAT
Explanation: Port Address Translation (PAT), also known as NAT overloading, is the specific technology typically used in home environments. Most home routers operate in this manner because an Internet Service Provider (ISP) usually assigns only one public IPv4 address to the router, yet multiple devices within the home—such as PCs, tablets, and phones—need to access the internet simultaneously.
PAT works by mapping multiple private IPv4 addresses to a single public IPv4 address. To distinguish between the different internal devices, the router tracks unique TCP or UDP port numbers for each session. This allows the router to accurately return incoming traffic from the internet to the specific device that requested it.
In contrast:
- Static NAT is a one-to-one mapping generally used for servers that need to be accessible from the outside.
- Dynamic NAT (without overloading) maps a group of private addresses to a pool of multiple public addresses and does not allow for the many-to-one sharing characteristic of home internet connections.
Related exam: Modules 8 – 13: Checkpoint Exam: Network Routing Answers (CCNP ENCOR v9)
