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1.

Distributed Queue Dual Bus is a standard for

Answer» This standard is part of a family of standards for local area networks (LANs) and metropolitan area networks (MANs) that deals with the physical and data link layers as defined by the ISO open systems interconnection reference model. It defines a high-speed shared medium access protocol for use over a dual, counterflowing, unidirectional bus subnetwork. The physical layer and distributed queue dual bus (DQDB) layer are required to support a logical link control (LLC) sublayer by means of a connectionless medium access control (MAC) sublayer service in a manner consistent with other IEEE 802 networks. Additional DQDB layer functions are specified as a framework for other services. These additional functions will support isochronous service users and connection-oriented data service users, but their implementation is not required for conformance.
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2.

A 8-Mbps token ring has a token holding timer value of 10 msec. What is the longest frame (assume header bits are negligible) that can be sent on this ring?

Answer» At 8 Mbps, a station can transmit 80,000 bits or 10,000 bytes in 10 msec. This is an upper bound on frame length. From this amount, some overhead must be subtracted, giving a slightly lower limit for the data portion. Therefore, 10,000 B frame is the correct answer.
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