By Andrew G. Blank
TCP/IP is the de facto protocol of the net and is supported by way of each significant community working approach. in an effort to attach networks and desktops to the net and each other, IT pros want a thorough figuring out of this protocol suite. Assuming no earlier wisdom of TCP/IP, this publication presents an outstanding creation to this center networking subject, explaining the basics of TCP/IP in basic terms with tangible examples. Aspiring desktop networking execs will relish the easy process and abundance of priceless details.
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Extra resources for TCP IP Foundations, Study Guide, Sybex
32 Chapter 3 Internet Protocol (IP) logical address This address can be modified; it refers only to the host. The Internet Protocol is the primary protocol at the Internet layer of the TCP/IP stack. This protocol is responsible for determining the source and destination IP addresses of every packet. The network administrator assigns every host on a network a unique IP address. Whereas the hardware address refers to the physical network card, the IP address refers to a logical address that the network administrator has assigned to the host.
This is an important part of the data delivery process because data must be delivered to a particular host through a connection to a network, and data leaving a host has to follow the rules of the network that it is on. The TCP/IP Network Interface layer does not regulate the type of network that the host is on, but the network that the host is on dictates the driver that the Network Interface layer uses. The host can be on an Ethernet, Token Ring, or Fiber Distributed Data Interface (FDDI), for instance, or on any other network topology.
After an IP address is resolved to a hardware address, it is stored in ARP cache for two minutes. If IP requests resolution again to the same IP address within those two minutes, the entry will stay in ARP cache another two minutes. An entry can stay in ARP cache for a maximum of 10 minutes; then it will be removed from cache regardless of whether it has been referenced within the last two minutes. The screen capture below shows the ARP cache. The cache contains three types of entries: the IP address in the first column, the hardware address in the second column, and an indication of how the entry got into ARP cache in the third column.