The act of trying repeatedly to connect to an unavailable FTP server with little or no time between connection attempts. It can be compared to repeatedly hitting the “redial” button on a telephone when dialing a phone number that is busy until the other phone is no longer busy.
Trading servers have a limit on the number of active connections that may be present at one time. A server cannot process an unlimited number of requests, so when servers are occupied to full capacity they will deny further access until they have free space. Hammering consumes bandwidth, slowing down the server. In addition to already working at capacity, the server has to then send a busy response to the device that was unable to connect every time that device attempts a connection, which further depletes the server’s resources and slows the system down in its connections with other devices.
Most FTP sites have policies against hammering and require FTP clients to set retry times at specific intervals, commonly at least 120 seconds between each attempt to connect. Most FTP sites can also monitor for devices that hammer, and once detected the server will ban access to the offending IP address either permanently or for a limited amount of time.
- hand-held computer
A portable computer that is small enough to be held in one’s hand. Although extremely convenient to carry, handheld computers have not replaced notebook computers because of their small keyboards and screens. The most popular hand-held computers are those that are specifically designed to provide PIM (personal information manager) functions, such as a calendar and […]
- Handheld Scanner
A small handheld scanning device used for digitizing images. While images from a handheld scanner are considered low quality, today’s technology enables full color 24 bit scanning. Depending on the scanner device type and manufacturer, handheld scanners can also define, translate, and hear printed text, and can also store and beam text to computers and […]
)(1) In many applications, when you select a graphical object, an outline of the object appears with small boxes. Each box is a handle. By dragging the handles, you can change the shape and size of the object. (2) In programming, a handle is a token, typically a pointer, that enables the program to access […]
(n.) The transfer of a cellular phone transmission from one radio frequency within a cell to another radio frequency in an adjacent cell. Handoffs occur when a cellular phone user passes out of the range that the cell can handle and into another cell��s range, and the signal is passed from one base station to […]
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Also called a mobile phone car kit. A hands-free kit contain both a speaker and a microphone to allow cellphone users to use their cellphone while driving, without using their hands to operate the device. Some kits may also come with a cellphone holder or cradle, and power supply cables and connectors. Hands-free kit cane […]