Network Address Translation (NAT) allows a host that does not have a registered IP address to communicate with other hosts on the Internet. NAT has gained such wide-spread acceptance that the majority of enterprise networks today use private IP addresses for most hosts on their network and use a small block of public IP addresses, with NAT translating between the two.
Having come this far in your CCNA studies, you should be well aware of the IP header format. The IP packet header has several fields in it, the most well-known of which probably are the Source IP Address and Destination IP Address. NAT simply translates, or changes, one or both of these addresses inside a packet header as the packet passes through the router performing the NAT operation. This is what basic NAT operation is, nothing more, nothing less.
Network Address Translation (NAT) allows a host that does not have a registered IP address to communicate with other hosts on the Internet. NAT has gained such wide-spread acceptance that the majority of enterprise networks today use private IP addresses for most hosts on their network and use a small block of public IP addresses, with NAT translating between the two.Having come this far in your CCNA studies, you should be well aware of the IP header format. The IP packet header has several fields in it, the most well-known of which probably are the Source IP Address and Destination IP Address. NAT simply translates, or changes, one or both of these addresses inside a packet header as the packet passes through the router performing the NAT operation. This is what basic NAT operation is, nothing more, nothing less.
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