Which of the following is a distributed multi-access network that helps in supporting integrated
communications using a dual bus and distributed queuing?

A.
Logical Link Control

B.
Token Ring network

C.
Distributed-queue dual-bus

D.
CSMA/CA

Explanation:

In telecommunication, a distributed-queue dual-bus network (DQDB) is a distributed multi-access
network that helps in supporting integrated communications using a dual bus and distributed
queuing, providing access to local or metropolitan area networks, and supporting connectionless
data transfer, connection-oriented data transfer, and isochronous communications, such as voice
communications. IEEE 802.6 is an example of a network providing DQDB access methods.
Answer option B is incorrect. A Token Ring network is a local area network (LAN) in which all
computers are connected in a ring or star topology and a bit- or token-passing scheme is used in
order to prevent the collision of data between two computers that want to send messages at the
same time. The Token Ring protocol is the second most widely-used protocol on local area

networks after Ethernet. The IBM Token Ring protocol led to a standard version, specified as IEEE
802.5. Both protocols are used and are very similar. The IEEE 802.5 Token Ring technology
provides for data transfer rates of either 4 or 16 megabits per second.
Answer option A is incorrect. The IEEE 802.2 standard defines Logical Link Control (LLC). LLC is
the upper portion of the data link layer for local area networks.
Answer option D is incorrect. Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) is an
access method used by wireless networks (IEEE 802.11). In this method, a device or computer
that transmits data needs to first listen to the channel for an amount of time to check for any
activity on the channel. If the channel is sensed as idle, the device is allowed to transmit data. If
the channel is busy, the device postpones its transmission. Once the channel is clear, the device
sends a signal telling all other devices not to transmit data, and then sends its packets. In Ethernet
(IEEE 802.3) networks that use CSMA/CD, the device or computer continues to wait for a time and
checks if the channel is still free. If the channel is free, the device transmits packets and waits for
an acknowledgment signal indicating that the packets were received.