Thursday, November 29, 2007

Networks : Accessing the internet from computers with private IP addresses (Proxy)

Computers on your network are configured with private IP addresses that are not routable on the Internet. You want to substitute a routable Internet address when the computers need to access the Internet.
What type of server performs this function for your network?
1. DNS
2. >>Proxy
3. Gateway
4. DHCP

Explanation : A proxy server replaces a computer's configured address with its own address for Internet access. Private networks are typically configured with IP addresses that are not routable on the Internet. This will prevent computers on the network from accessing the Internet unless the configured private address is replaced by a routable IP address. This is done to help ensure the security of the network computers. Because only the proxy server address is exposed on the Internet, it is much harder for a hacker to break into the network.

A Dynamic Host Configuration Protocol (DHCP) server does not replace a computer's configured address for Internet access. A DHCP server assigns IP addresses and other TCP/IP configuration settings to network computers.

A Domain Name Service (DNS) server does not replace a computer's configured address for Internet access. DNS servers provide name registration and address resolution services.

A gateway does not replace a computer's configured address for Internet access. The term gateway, in a TCP/IP network, refers to a router. A TCP/IP gateway provides access to other network segments or networks in a routed network.
Objective: Networks