In this lesson were going to look at the various

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In this lesson, we're going to look at the various configuration methods that can be used with the TCP/IP network. Static Configuration 0:23-1:05 The first method is to use a static configuration. With a static configuration, each host on a networkneeds to be manually configured individually. If you had 10 hosts on a network, then you would have to go to all 10 hosts and configure them. With smaller networks, this might not be that bad, but suppose the network now had 100 or 1,000 hosts. With static configuration, not only do you have to manually configure each computer, but you also have to remember the IP addresses you've already assigned so that you don't have any duplicate IP address conflicts. This method is also prone to errors. It's easy to accidentally enter the wrong default gateway or subnet mask. Static configuration is really only used in special situations or on very small networks. Dynamic Host Configuration Protocol (DHCP) 1:06-2:11 The second method is to configure the network to use the dynamic host configuration protocol or DHCP. With DHCP, a special server known as a DHCP server is used to automatically configure all hosts on a network. With this configuration, the DHCP server is configured with all the necessary settings, such as an IP address, subnet mask and default gateway and sends them to each host. The DHCP server also makes sure that no two hosts have the same IP address. When host connects to a network using DHCP, it sends out a broadcast message to look for a DHCP server. If one exists, then the DHCP server responds with an IP address that the computer can use called a lease and all the necessary configuration settings. Using DHCP on a network is almost a necessity in today's networking world. Because most networks are composed of dozens of hosts, having a DHCP server greatly reduces the amount of time spent in configuring hosts. In addition, most SOHO routers have DHCP functionality and can function as a DHCP server. Automatic Private IP Addressing (APIPA) 2:12-3:27 The third method isn't so much a configuration type as it is a failsafe. The automatic private IP address or APIPA is the default TCP/IP configuration method used by hosts when no DHCP server can be found. By default, TCP/IP hosts are configured to automatically obtain an IP address from a DHCP server.However, if no DHCP server is found, then APIPA will assign the host a network address of 169.254.0.0, a subnet mask of 255.255.0.0 and a host address in that range. It does not, however,assign a default gateway so communication outside the network is impossible. The idea behind APIPA is to allow network communication to continue if a DHCP server goes down or no DHCP server exists. Because all hosts will default to the same network address and subnet mask,they'll be able to communicate with each other.
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