Wednesday, April 22, 2009


Network Keyterm - 6


Hollow cables that send data by pulses of light. Fiber optics allows for a much faster data transmission because of the capability of transmitting data at the speed of light. Most home computer users will never get the opportunity to work with fiber-optic cables because almost all home networks use other types of cables or wireless connections to connect their computers together. Fiber-optic cables are often used in corporate networks or world-wide networks such as Internet backbones because of its capabilities. The image to the right is an example of fiber-optic.

Please take the below pre-cautions when handling and using fiber-optic cables and/or networking equipment:

  1. Keep the fiber connections and connectors capped when not in use to help prevent dust, dirt or other substances from being on the connection of connector.
  2. Always keep your fiber connections and connectors clean.
  3. Do not allow the fiber cabling to bend more than the diameter of your fist. Bending the cable further could cause physical damage to the cable.
  4. Do not touch the tip of the actual fiber cabling, this could cut you.
  5. Never look down the fiber cabling when in use as light pulses are being used. To determine if the pulse is being sent, use a meter.


A software utility and/or hardware device that limits outside network access to a computer or local network by blocking or restricting ports. Firewalls are a great step for helping prevent un-authorized access to a company or home network. The image to the right is a 3Com SuperStack 3 Firewall, an example of what a hardware firewall may look like.
  • A listing of computer firewall programs as well as additional information about preventing unauthorized access to your computer can be found on document CH000464.
  • See document CH000907 for additional information about disabling firewalls.



Short for File Transfer Protocol, FTP was first proposed in 1971 for and developed for implementation on hosts at MIT and was later defined by RFC 959 published in 1985. FTP is a standard way to transfer files between computers. The method has built-in error checking. FTP often refers to a standard way of transferring many types of files over the Internet. Below is a short listing of some of the software programs you can use to connect to an FTP server from your computer.
  1. FileZilla - A fantastic free FTP program with everything most users need.
  2. SmartFTP - A great FTP with everything most users need.
  3. CuteFTP - Another popular and widely used FTP program.
  4. Internet Explorer - Users who have Microsoft Internet Explorer on their computer can also use Internet Explorer to connect to FTP servers.

In addition to using any third-party software program, many computers, including all Microsoft Windows computers, Linux computers, and Mac OS X computers, come with a command line FTP program; see our FTP page for additional information and tips with these commands.

Although many FTP servers require logins many FTP servers also allow anonymous ftp login, which only require a username, often an e-mail and no password.

Finally, it is important to realize that FTP is insecure. When your username and password are sent to the server they're both sent as plaintext and could be intercepted and read.


**Forests and Trees**

Also referred to as forests and trees, the domain tree is the group of domains in Windows Active directory that all have the same Domain Name Server (DNS). For example,, the top domain also referred to as the parent and its child domains and


**Forward error correction**

Sometimes abbreviated as FEC, forward error correction is a type of algorithm used in one-way data communications where additional data is added onto the data packet to ensure the receiving end gets no errors.




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