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| A fully digital, dedicated connection to the telephone system that provides download speeds of up to 9 Mbps and upload speeds of up to 1Mbps. |
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| ISDN service that consist of two 64 Kbps B channels and one 16 Kbps D channel for total of 144 Kbps |
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| A type of virus that combines the characteristics of boot sector and executable viruses. |
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| A virus that alters the code in the MBR of a hard drive. Once a machine is booted, the virus will reside in memory and attempt to infect other systems. |
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| A network topology that connects all computers to a single, shared cable. In a bus topology, if one computer fails, the network fails. |
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| A variety of grades called categories for UTP cables. The ratings are officially rated in megahertz indicating the highest frequency bandwidth the cable can handle. |
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| Channel Service Unit / Digital Service Unit |
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Definition
| A piece of equiptment that connects a leased line from the telephone company to a customer's equipment. It performs line encoding and conditioning functions, and it often has loop back function for testing. |
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| Popular medium for computer data storage developed in the mid-1980's orginally for music. |
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| Also known as flooding attacks, this floods the network with so many request that it becomes overwhelmed and ceases functioning. |
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| Backs up files that were changed or added since the last full backup. |
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| A public encryption key signed with digital signature from trusted third party called a certificate authority. This key serves to validate the identity of its holder when that person or company sends data to other parties. |
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| Large capacity data tapes used in backups. |
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| A high speed internet connection technology that uses a regualr telephone line for conectivity. Typical home users of the technology use an asynchronous form with download speeds of up to 1.4Mbps and upload speeds of about 384 Kbps. |
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| Provides fault tolerance by writing data across multiple drives and then including an additional drive, called a parity drive, that stores information to rebuild the data contained on the other drives. Requires at least three physical disk to function. |
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| Software that prevents unauthorized traffic between two networks by examining the IP packets that travel on both networks. Firewalls look at the IP address and type of traffic is allowed. |
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| Internet Connection Firewall |
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Definition
| A Software firewall built into Windows XP that protects a system from unauthorized access from the internet. |
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| A group of protocols used to encrypt IP packets. It is most commonly seen on Virtual Private Networks. |
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| Device that can determine shorts, crimps or attenuation in a cable. |
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| PPP (Point to Point Protocol) |
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Definition
| Serial Protocol used for sending information over a dial up connection. This protocol enables the sending of IP packets, supports compression, enables IP address negotiation, and is the successor of the older SLIP protocol. |
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Definition
| A protocol that enables a computer to connect to the internet through a dial-in connection and enjoy most of the benefits of direct connection. |
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| PSTN (public Switch Telephone Network) |
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Definition
| The technical name for the medium you use every day to make phone calls and send faxes. The remote Access Service enables connections across several media. The most common of there is PSTN. |
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| An application that enables UNIX systems to connunicate using SMBs (Sever Message Blocks) This,in turn, enables them to act as Microsoft clients and servers on the network. |
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| More a concept than an actual virus these are usually boot sector viruses that use a variety of methods to "hide" from antivirus software. |
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| Sends a signal down a wire which is reflected back to the device. Will then calculate the distance down the cable before being reflected back. |
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Definition
| Used to perform test of phone and network lines. Generates a tone to assist in identification of the wire being checked. |
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