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Security confusion
by jsprague
Jul. 25, 2008 11:57
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Certpedia: Terms That Start With U |
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# | A | B | C | D | E | F | G | H | I | J | K | L | M
N | O | P | Q | R | S | T | U | V | W | X | Y | Z
 URL (Uniform Resource Locator) - As the name indicates, a URL is an address used to give the location of a resource on the web. The first part is the ‘service descriptor’ which identifies the protocol being used (in the diagram it is HTTP). The ‘//’ indicates the start of path (the root directory) which is followed by the domain name. The remainder of the address is the directory path on the server that specifies the location of the file to be fetched. You may have noticed that when you visit a domain, the complete path is not displayed. For example, if you visit our home page at http://www.mcmcse.com, there is no file specified after the domain name.
UDP (User Datagram Protocol) - UDP is a core component of the Internet Protocol suite. Like TCP, UDP is used with IP, however, UDP is connectionless and does not guarantee reliable communication; the application itself must process any errors and check for reliable delivery. It is used in place of TCP when a reliable delivery is not required such as with streaming audio and video, DNS, online gaming, VOIP, SNMP, RIP, etc.
 USB (Universal Serial Bus) - A plug-and-play interface between a computer and peripherals (such as keyboards, scanners, printers, digital cameras, etc). In some situations, it can also be used to network 2 computers directly together. USB devices are "hot-swappable" which means that a new device can be added or removed without having to shut down the computer. USB 2.0 can transmit data at speeds up to 480Mbps. When a lot of USB devices need to be connected to a computer, a USB hub can be used to handle the extra connections.
USB Flash Drive - See Flash Drives
 UTP (Unshielded Twisted Pair) - It is a cable type that consists of two or more insulated conductors in which each pair of conductors are twisted around each other. Category 1 UTP cables are used for telephony connections. Category 3 and higher are used for Ethernet LAN connections. UTP is inexpensive and easy to work with. Wiring tutorial
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