CertiGuide to Network+  9  Glossary

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Input/Output (I/O) port

A channel through which data is transferred between a device and the microprocessor. The port appears to the microprocessor as one or more memory addresses that it can use to send or receive data.

IE ports, also called “mailslots,” offer limited access to the cartridges in a library managed by Removable Storage. When an administrator adds cartridges to a library through an IE port, the cartridges are placed in the IE port and then the library uses the transport to move the cartridges from the IE port to a slot.

Some libraries have no IE ports; others have several. Some IE ports handle only one cartridge at a time; others can handle several at one time.

A type of counter that displays the most recent measurement taken by the Performance console.

An organization of engineering and electronics professionals that are notable for developing standards for hardware and software.

A type of disk-drive interface in which the controller electronics reside on the drive itself, eliminating the need for a separate adapter card. IDE offers advantages such as look-ahead caching to increase overall performance.

Refer to Hard Disk Interface.

A type of phone line used to enhance WAN speeds. ISDN lines can transmit at speeds of 64 or 128 kilobits per second, as opposed to standard phone lines, which typically transmit at 28.8 kilobits per second. The phone company must install an ISDN line at both the server site and the remote site.

A basic security function of cryptography. Integrity provides verification that the original contents of information have not been altered or corrupted. Without integrity, someone might alter information or the information might become corrupted, but the alteration can go undetected. For example, an Internet Protocol security property that protects data from unauthorized modification in transit, ensuring that the data received is exactly the same as the data sent. Hash functions sign each packet with a cryptographic checksum, which the receiving computer checks before opening the packet. If the packet-and therefore signature-has changed, the packet is discarded.

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