2010年4月20日星期二

IP address







IP address











IP address

An identifier for a computer
or device on a TCP/IP network. Networks using the TCP/IP protocol route messages based on the IP address of the destination. The format of an IP address is a 32-bit numeric address written as four numbers separated by periods. Each number can be zero to 255. For example, 1.160.10.240 could be an IP address.
Within an isolated network, you can assign IP addresses at random as long as each one is unique. However, connecting a private network to the Internet requires using registered IP addresses (called Internet addresses) to avoid duplicates.
The four numbers in an IP address are used in different ways to identify a particular network and a host on that network. Four regional Internet registries -- ARIN, RIPE NCC, LACNIC and APNIC -- assign Internet addresses from the following three classes.
Class A - supports 16 million hosts on each of 126 networks
Class B - supports 65,000 hosts on each of 16,000 networks
Class C - supports 254 hosts on each of 2 million networks
The number of unassigned Internet addresses is running out, so a new classless scheme called CIDR is gradually replacing the system based on classes A, B, and C and is tied to adoption of IPv6.
Also see Understanding IP Addressing in the Did You Know . . .? section of Webopedia.
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For internet.com pages about IP address . Also check out the following links!

TCP/IP and IPX routing tutorial This tutorial supplies information on setting up a relatively simple WAN-connected internetwork or Internet-connected LAN. Includes explanations of IP addresses, classes, netmasks, subnetting, routing, several example networks, and a basic explanation of IPX routing
Webopedia's "Did You Know...?" Section Use this Webopedia knowledge section for an in-depth overview of specific technologies and occurrences in the areas of Computer Science, The Internet, and Computer Hardware and Software.
Webopedia's Quick Reference Section Use this Webopedia reference section for information on common Internet and computer facts and occurrences.
Webopedia's Tech Support Area Read the descriptions of each tech support Web site below, and choose the one that best suits your needs. We offer these links to help users get the tech support they need.
LearnToSubnet.ComAn educational course on addressing TCP/IP Networks that includes IP Addresses and Subnetting. Topics include: Binary Math, IP Addressing (IP Address), Subnet Mask, and Custom Subnet Mask.
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IP address

Definitions of IP address on the Web:
An Internet Protocol (IP) address is a numerical label that is assigned to devices participating in a computer network utilizing the Internet ...en.wikipedia.org/wiki/IP_address
(Internet Protocol address) A number assigned to each computer's or other device's network interface(s) which are active on a network supporting ...en.wiktionary.org/wiki/IP_address
A unique numeric identifier for a computer on a network.library.gnome.org/users/user-guide/stable/glossary-1.html.en
The network address of a computer system or host.www.primode.com/glossary.html
An identifier for a computer or device on a TCP/IP network. Networks using the TCP/IP protocol route messages based on the IP address of the ...www.techniqueweb.com/terminology.php
A binary value used by the IP protocol to determine how to deliver packets to their destination hosts. See the entry dotted-quad for a common representation of these addresses.tangentsoft.net/wskfaq/glossary.html
Internet Protocol address – a computer network addressvisibleprocrastinations.wordpress.com/2007/07/06/videoconference-glossary-of-terms/
Every machine that is on the Internet has a unique IP number - if a machine does not have an IP number, it is not really on the Internet. ...www.buyyourdot.com/glossary.php
Numeric code that uniquely identifies a particular computer on the Internet.www.luc.edu/its/security/pci_glossary.shtml
Internet Protocol Address, a unique number assigned to every device connected to the Internet.www.headland.co.uk/pages/glossary
a unique number which identifies a computer and its location on the internet. Some of the online services at the University of Kent use the IP ...www.kent.ac.uk/library/support/a-z/glossary.html
Also called an Internet address. The unique address for each computer on the Internet. The IP address appears as a set of four numbers separated by periods. The numbers indicate the domain, the network, the subnetwork and the host computer. ...www.valenciacc.edu/lrcwest/lis2004/glossary.htm
A set of numbers used for a computer or device to acknowledge a website address.www.legalinternetmarketing.com/seo-glossary.html
Any computing device that uses the Internet must be assigned an Internet or IP address. All workstations on a given IP network use the same IP network number, and each workstation has a unique IP host address and an optional subnetwork number. ...www.telesysglobal.com/data_glossary.html
A method of locating a physical resource like a computer or digital camera on a TCP/IP computer networkwww.videoanalytics.org/pages/terminology.html
Find definitions of IP address in: Chinese (Simplified) Chinese (Traditional) Czech Dutch English French German Italian Portuguese Romanian Russian Spanish all languages

colour code

Color code
From Wikipedia, the free encyclopedia
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Wikimedia Commons has media related to: Color code
Color code (as a system for displaying information by using different colors) may refer to:
Bottled gases
Color codes in three-phase electric power (electrical wiring)
Electronic color code
Web colors for HTML color codes
25-pair color code
Color coding of optical fibers
Color codes of fire extinguishers
Hanky code
Jumper cables
Traffic lights
Navigation lights, sea marks and characteristic lights
Ribbon colors see: Category:Ribbon symbolism
The Homeland Security Advisory System color code in the United States
Utility color codes
ColorCode 3D stereo image system using blue/amber viewing glasses
[edit] See also
Color-coding, an algorithmic technique in computer science

This disambiguation page lists articles associated with the same title.If an internal link led you here, you may wish to change the link to point directly to the intended article.
Retrieved from "http://en.wikipedia.org/wiki/Color_code"
Categories: Disambiguation pages Color codes
Hidden categories: All article disambiguation pages All disambiguation pages

colour code

Definitions of Colour code on the Web:
Color code (as a system for displaying information by using different colors) may refer to: *Bottled gases *Color codes in three-phase electric power (electrical wiring) *Electronic color code *Web colors for HTML color codes *25-pair color code *Color coding of optical fibers *Color codes of ...en.wikipedia.org/wiki/Colour_code
Any system where colours are used to categorize elements of sets; To mark items with a colour code as a means of sortingen.wiktionary.org/wiki/colour_code

colour code
















straight cable











straight cable

What are Straight and Crossover cableCommon Ethernet network cable are straight and crossover cable. This Ethernet network cable is made of 4 pair high performance cable that consists twisted pair conductors that used for data transmission. Both end of cable is called RJ45 connector.
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The cable can be categorized as Cat 5, Cat 5e, Cat 6 UTP cable. Cat 5 UTP cable can support 10/100 Mbps Ethernet network, whereas Cat 5e and Cat 6 UTP cable can support Ethernet network running at 10/100/1000 Mbps. You might heard about Cat 3 UTP cable, it's not popular anymore since it can only support 10 Mbps Ethernet network.
Straight and crossover cable can be Cat3, Cat 5, Cat 5e or Cat 6 UTP cable, the only difference is each type will have different wire arrangement in the cable for serving different purposes.
Straight Cable
You usually use straight cable to connect different type of devices. This type of cable will be used most of the time and can be used to:
1) Connect a computer to a switch/hub's normal port.2) Connect a computer to a cable/DSL modem's LAN port. 3) Connect a router's WAN port to a cable/DSL modem's LAN port.4) Connect a router's LAN port to a switch/hub's uplink port. (normally used for expanding network)5) Connect 2 switches/hubs with one of the switch/hub using an uplink port and the other one using normal port.
If you need to check how straight cable looks like, it's easy. Both side (side A and side B) of cable have wire arrangement with same color. Check out different types of straight cable that are available in the market here.
Crossover Cable
Sometimes you will use crossover cable, it's usually used to connect same type of devices. A crossover cable can be used to:
1) Connect 2 computers directly.2) Connect a router's LAN port to a switch/hub's normal port. (normally used for expanding network)3) Connect 2 switches/hubs by using normal port in both switches/hubs.
In you need to check how crossover cable looks like, both side (side A and side B) of cable have wire arrangement with following different color . Have a look on these crossover cables if you plan to buy one. You can also find more network cable choices and information from Comtrad Cables.
In case you need to make a crossover cable yourself! You can use this crimper to do it.
Lastly, if you still not sure which type of cable to be used sometimes, try both cables and see which works.
Note: If there is auto MDI/MDI-X feature support on the switch, hub, network card or other network devices, you don't have to use crossover cable in the situation which I mentioned above. This is because crossover function would be enabled automatically when it's needed

cross cable

A crossover cable is a cable that is used to interconnect two computers by "crossing over" (reversing) their respective PIN contacts. Either an RS-232C or a telephone jack connection is possible. A crossover cable is sometimes known as a null modem. Possible reasons to connect two computers directly to each other include:
Playing a game competitively (one person at each computer) with fast response time
Testing one computer by examining its behavior at the other computer
Saving the cost of a hub when you want to interconnect two devices in the same home or office