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Homework and Emergencies Homework & Coursework Questions What is the difference between a Host and an End System? Post 302508165 by Neo on Saturday 26th of March 2011 09:04:20 AM
Old 03-26-2011
Wikipedia... End System

Quote:
In networking jargon, the computers that are connected to the Internet are sometimes referred to as End Systems. They are labeled end systems because they sit at the edge of the Internet. The end user always interacts with the end systems.

The Internet’s end systems include some computers with which the end user does not interact. These include e-mail servers and web servers.

With the accelerating rate at which technology is advancing today, household items (such as toasters and refrigerators) as well as portable, handheld computers and digital cameras are all being connected to the Internet as end systems.

End systems that are connected to the Internet are also referred to as hosts; this is because they host (run) Internet applications such as a web browser or an email retrieval program.
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HOSTS(5)						     Linux Programmer's Manual							  HOSTS(5)

NAME
hosts - The static table lookup for hostnames SYNOPSIS
/etc/hosts DESCRIPTION
This manual page describes the format of the /etc/hosts file. This file is a simple text file that associates IP addresses with hostnames, one line per IP address. For each host a single line should be present with the following information: IP_address canonical_hostname [aliases...] Fields of the entry are separated by any number of blanks and/or tab characters. Text from a "#" character until the end of the line is a comment, and is ignored. Host names may contain only alphanumeric characters, minus signs ("-"), and periods ("."). They must begin with an alphabetic character and end with an alphanumeric character. Optional aliases provide for name changes, alternate spellings, shorter hostnames, or generic hostnames (for example, localhost). The Berkeley Internet Name Domain (BIND) Server implements the Internet name server for Unix systems. It augments or replaces the /etc/hosts file or hostname lookup, and frees a host from relying on /etc/hosts being up to date and complete. In modern systems, even though the host table has been superseded by DNS, it is still widely used for: bootstrapping Most systems have a small host table containing the name and address information for important hosts on the local network. This is useful when DNS is not running, for example during system bootup. NIS Sites that use NIS use the host table as input to the NIS host database. Even though NIS can be used with DNS, most NIS sites still use the host table with an entry for all local hosts as a backup. isolated nodes Very small sites that are isolated from the network use the host table instead of DNS. If the local information rarely changes, and the network is not connected to the Internet, DNS offers little advantage. FILES
/etc/hosts NOTES
Modifications to this file normally take effect immediately, except in cases where the file is cached by applications. Historical Notes RFC 952 gave the original format for the host table, though it has since changed. Before the advent of DNS, the host table was the only way of resolving hostnames on the fledgling Internet. Indeed, this file could be created from the official host data base maintained at the Network Information Control Center (NIC), though local changes were often required to bring it up to date regarding unofficial aliases and/or unknown hosts. The NIC no longer maintains the hosts.txt files, though looking around at the time of writing (circa 2000), there are historical hosts.txt files on the WWW. I just found three, from 92, 94, and 95. EXAMPLE
127.0.0.1 localhost 192.168.1.10 foo.mydomain.org foo 192.168.1.13 bar.mydomain.org bar 146.82.138.7 master.debian.org master 209.237.226.90 www.opensource.org SEE ALSO
hostname(1), resolver(3), resolver(5), hostname(7), named(8), Internet RFC 952 COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2002-06-16 HOSTS(5)
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