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Z
Z
Impedance (Z), in electrical devices, refers to the amount of opposition faced by direct or alternating current when it passes through a conductor component, circuit or system. Impedance is null when current and voltage are constant and thus its value is never zero or null in the case of alternating current.
Zachman Framework
The Zachman Framework is a visual aid for organizing ideas about enterprise technology. It is attributed to IBM professional John Zachman, as presented in the article "A Framework for Information Systems Architecture" published in the IBM Systems Journal in 1987.
Zebibyte
A zebibyte is a unit of data storage that equals 2 to the 70th power, or 1,180,591,620,717,411,303,424 bytes.
Zero Day Exploit
A zero day exploit is a malicious computer attack that takes advantage of a security hole before the vulnerability is known. This means the security issue is made known the same day as the computer attack is released. In other words, the software developer has zero days to prepare for the security breach and must work as quickly as possible to develop a patch or update that fixes the problem.
Zero day exploits may involve viruses, trojan horses, worms or other malicious code that can be run within a software program. While most programs do not allow unauthorized code to be executed, hackers can sometimes create files that will cause a program to perform functions unintended by the developer. Programs like Web browsers and media players are often targeted by hackers because they can receive files from the Internet and have access to system functions.
While most zero day exploits may not cause serious damage to your system, some may be able to corrupt or delete files. Because the security hole is made known the same day the attack is released, zero day exploits are difficult to prevent, even if you have antivirus software installed on your computer. Therefore, it is always good to keep a backup of your data in a safe place so that no hacker attack can cause you to lose your data.
Zettabyte
A zettabyte is 1021 or 1,000,000,000,000,000,000,000 bytes.
One zettabyte (abbreviated "ZB") is equal to 1,000 exabytes and precedes the yottabyte unit of measurement. Zettabytes are slightly smaller than zebibytes, which contain 1,180,591,620,717,411,303,424 (270) bytes.
A single zettabyte contains one sextillion bytes, or one billion terabytes. That means it would take one billion one terabyte hard drives to store one zettabyte of data. Because the zettabyte unit of measurement is so large, it is only used to measure large aggregate amounts of data. Even all the data in the world is estimated to be only a few zettabytes.
NOTE:View a list of all the units of measurement used for measuring data storage.
ZIF
A protocol is a standard or set of rules that computers and other devices use when communicating with one another.
Zip
Ta zip file is a compressed file that may contain one or more files compressed into it for better storage. Compressing a file makes it smaller in size and therefore takes up less space. It is like a storage box. You can unzip or unpack the zip file to see the contents of it. Zip files can be compressed or decompressed using a computer program like Winzip or 7zip.
Zone File
A zone file is stored on a name server and provides information about one or more domain names. Each zone file contains a list of DNS records with mappings between domain names and IP addresses. These records define the IP address of a domain name, the reverse lookup of an IP to other domains, and contain DNS and mail server information.
Because zone files are plain text files, they can be edited quickly and easily. However, this also means that if unauthorized users gain access to zone files, the files can be easily modified. This could cause websites to not respond, or worse yet, redirect to the wrong Web server. For this reason, it is important to keep the zone files on a highly secured server and always have a recent backup of zone files on another machine.
Z File System (ZFS)
The Z File System (ZFS) is an open-source logical volume manager and file system created by Sun Microsystems, originally for its Solaris operating system. It is now used in many operating systems including FreeBSD, NetBSD, Mac OS X Server 10.5 and various Linux distributions through ZFS-FUSE. The most distinguishing feature of ZFS is pooled storage, where multiple storage devices are treated as one big pool rather than as separate devices and logical drives. Storage can be taken from the pool and allocated to other file systems, and the pool can be increased by adding new storage devices to the pool. This is the same method of resource allocation used in a multitenant cloud environment.
Z-Wave
Z-Wave is a wireless network designed by Zensys Inc. to provide communication between devices in a home control network. Z-Wave may be used to control lights, heating and air conditioning, and appliances and home security, among other functions.
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