cisco ccna 4 chapter 1 answers

cisco ccna 4 chapter 1 answers.Extended Maps an IP address and TCP/UDP port number to another IP address and port number (which may or may not be present)Static Manually converts between addresses (and possibly ports)Dynamic Automatic translation between addresses (and possibly ports) by address translation deviceNetwork Address Translation (NAT) Converts addresses only (no port numbers)Port Address Translation (PAT) Converts many internal IP addresses to the same IP address and assigns a different TCP/UDP port number to each internal IP address, ensuring that the result of the conversion is uniqueStatic NATIn static NAT, an address translation device performs a manual translation, converting one IP address to another IP address. Static NAT is typically used to convert the destination IP address of packets entering the internal network, but it can also be used to convert the source address of packets leaving the internal network. Figure 22.1 shows a simple example of an external user trying to access an internal Web server. In this example, you want the Internet user to be able to access the internal Web server, but it is using a private address (10 ? 1.1). If the external user enters the private address in the destination IP address field, there will be a problem because the user's ISP will discard such packets. Therefore, the web server needs to be made to lookinternal networkThe Web server has a public address, which is defined in the address translation device (in this case, the Cisco router). On the router, the internal global IP address 200.200.200.1 is assigned to the Web server, and the DNS server advertises to external usersAddress translation table