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Also, if systems need to communicate to other TCP/IP systems on the local area network (LAN) or wide area network (WAN), they often use TCP/IP as well.
A key linkage among the address assignment and name resolution function is the automated updating of an IP address and hostname association from a DHCP server to a DNS server.
``So what if my host leaks a few packets to the global Internet? '' The reason is that inconsistent configuration between your home hosts and your local DNS servers can, and often does, cause leakage of DNS updates for private IP addresses to the global Internet.
This leakage causes the following problems: Unfortunately, most users have no knowledge of their own misbehaving hosts broadcasting private information to the world.
You can also use other settings so that systems can be configured to use an alternate, manually configured IP address instead of one that a Dynamic Host Configuration Protocol (DHCP) server provides.
Autoconfiguration of the enabled network interface card (NIC) metric is also available; this feature determines the best routing metric for each interface's default gateway, based on its speed.