What is the approach method?

Access As far as a computer is concerned, it can refer to the option to use a computer, program, network, or web. The access method may be a suitable protocol for permitting any of these operations. Alternatively, the access method may be a software routine that participates in the storage, search, transfer or receiving data or detection - and, if possible, change - unsuccessful data transfer.

In terms of the first meaning, the access method is often login using a justified user name and password. The intelligent card keyboard on the other hand may require not only an intelligent card, but also a user name and password to create a double -factor verification method. Alternative methods can be used on the website. OAuth is an open verification protocol that allows only authorized users to access private information.

With regard to the second meaning, there are different access methods for different systems. For tapes with sequential access to the measures, thod is used (withAm). In this method, the data is maintained in the sequential order, whether ascending or decreasing, based on the specified key field. Sam compares records for verification.

To access the disk, indexed access methods, often indexed sequence access (ISAM) are used. While the data is stored gradually, as in Sam, an index is also created in which record links are stored gradually according to the initial date. The key field index is also maintained, so they can be accessed directly.

There are several access methods for LAN (local networks), including the token and CSMA/CD detection (collisions in CSMA/CD) that use the first two layers of seven -layer OSI (Open System Interconnection). Mainframes use other methods that use other layers from the OSI model.

CSMA/CD access method begins with control, the sowing is quiet and awaits if necessary, when it is. If collisions are detected, the device and the network are waiting for repetition. When the Ethernet station sends a data frame, the transceiver must make an address match to pass the frame. When the token passes, the token frame is repeated. If you want to send a message, the device is waiting for an empty token and fills it with an address and with some or all data, and all network nodes monitor the tokens for their own address.