Wednesday, November 14, 2012

Token Passing Network

Ttoken passing definition

In token passing system, all stations are logically connected in the form of a ring and Manage of the admission to the medium is performed using a token. A token is an individual bit Guide or a tiny packet, more often than not several bits in length, which flow from node next node. Token passing can be used with both broadcast (token bus) and in order Connected (token ring) type of networks with some difference in the details as considered.

In case of token ring, token is passed data packets from a node to the physically neighboring node. On the other hand, in the token bus, token is passed with the assist of the MAC address of the computer which logical design in a ring. In either case a node currently holding the token has the’ right to transmit’. When it has got data to send, it removes the token and transmits the Data and then forwards the token to the next logical or physical computer tokens in the ring. If a node Currently holding the token has no data to send, it simply forwards the token to the next. The token passing scheme is resourceful compare to the polling technique, but it Realize on the correct and reliable operation of all the nodes. There exists a number of
Potential problems, such as lost token, duplicate token, and insertion of a node, removal Of a node, this must be tackled for correct and reliable operation of this scheme.

Token passing protocol

    The token passing protocol relies on a manage signal called the token. A token is a 24-bit packet that circulates all the way through the token passing network from NIC to NIC in an arranged manner. If a workplace wants to transmit a communication, first it must grab the token. At that end, the workplace has absolute manage over the communications channel. The subsistence of only one token eliminates the option of signal collision. This means that only one station can speak at a time. Token authentication may be a physical device that an authorized user of computer services is given to ease authentication. The term may also refer to software tokens. Token authentication is used to prove one's identity automatically the token is used in addition to or in place of a password to prove that the client is who they claim to be. Controlling network access the token acts like an electronic key to access something.

Some may store cryptographic keys, such as a digital signature, or biometric data, such as fingerprint minutiae. Some designs feature tamper resistant packaging, while others may include small keypads to allow entry of a PIN or a simple button to start a generating routine with some display capability to show a generated key number. Special design includes a USB connector, RFID functions or Bluetooth wireless interface to enable transfer of a generated key number series to a client system.



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