Token passing is the access method traditionally associated with which topology?
- A.Star topology
- B.Ring topology
- C.Bus topology
- D.Tree topology
Correct answer
Explanation
The correct answer is B, Ring topology. In a ring the machines form a closed loop and a small control frame called a token keeps circulating around it; only the computer holding the token may put data on the ring, and when it finishes it releases the token to the next machine. Because permission is passed around in turn, no two nodes transmit together and collisions cannot occur, which was the chief attraction of the old Token Ring networks. Option A is wrong because a star network depends on a central hub or switch and uses contention or switching, not a circulating token. Option C is wrong because a bus network uses CSMA/CD, in which a node listens to the backbone, sends when it is free and backs off if a collision is detected. Option D is wrong because a tree is only a hierarchy of star segments and inherits their access method.
Read the full article: Computer Networks: Topologies, Devices and OSI Layers
Practice Questions
View allIn terms of computers, the set of ways in which an adversary can enter a system and can potentially cause damage is called:
- A.Attack Surface
- B.Attack Signature
- C.Attack Pattern
- D.Attack Path
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The attack surface of a system is the total collection of every point at which an unauthorised person could try to enter it or pull data out of it: open ports, running services, user accounts, login pages, removable drives and even the employees who can be tricked.
Read the full explanation →Which of the following devices performs signal conversion?
- A.Modulator
- B.Mouse
- C.Plotter
- D.Keyboard
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A modulator changes the form of a signal: it loads the digital bits produced by a computer onto an analog carrier wave so that they can travel over a telephone line, a cable or a radio link.
Read the full explanation →What is the full form of GPRS in mobile computing?
- A.General Packet Radio Service
- B.General Packet Route service
- C.General Package Radio Service
- D.General Packet Radiation Service
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GPRS was added to the 2G cellular system so that the same radio channel could carry data in packets instead of holding a circuit open the way a voice call does.
Read the full explanation →In which network topology is every node connected to a single central device?
- A.Bus topology
- B.Ring topology
- C.Star topology
- D.Mesh topology
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In a star network every computer has its own cable running to a central hub or switch, so the shape resembles the spokes of a wheel.
Read the full explanation →How many cables are needed to connect 6 computers in a fully connected mesh topology?
- A.12
- B.15
- C.18
- D.30
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In a full mesh every node is joined directly to every other node, so the number of links equals the number of pairs that can be formed from the nodes, given by the formula n(n-1)/2.
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