什么是NAT？
正确答案:
NAT offers the dual functions of security and address translation.
（1）It enables private IP networks that use unregistered IP addresses to connect to the Internet. It works by translating private addresses（illegal and globally unique on internet） in the internal network into legal addresses before packets are forwarded to internet.
（2）NAT can be configured to advertise only one address for the entire network to the outside world.This provides additional security by effectively hiding the entire internal network behind that address.
（1）It enables private IP networks that use unregistered IP addresses to connect to the Internet. It works by translating private addresses（illegal and globally unique on internet） in the internal network into legal addresses before packets are forwarded to internet.
（2）NAT can be configured to advertise only one address for the entire network to the outside world.This provides additional security by effectively hiding the entire internal network behind that address.
答案解析:有
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