Questão 2028812

Text 5A5AAA

1 Computer networks, whether LANs, MANs, or

WANs, are constructed based on a topology. There are several

topologies, such as tree, bus and ring, and the popular mesh

4 and star.

A mesh topology allows multiple access links between

network elements, unlike other types of topologies. The

7 multiplicity of access links between network elements offers an

advantage in network reliability because whenever one network

element fails, the network does not cease operations; it simply

10 finds a bypass to the failed element and the network remains to

function. Mesh topology is most often applied in MAN networks.

Another very popular topology, especially in LAN

13 network technologies, is a star topology. A star topology is

characterized by a central prominent node that connects to

every other element in the network. So all elements in the

16 network are connected to a central element. Every network

element in a star topology is pairwise connected in a

point-to-point manner through the central element, and

19 communication between any pair of elements must go through

this central element. The central element or node can operate

either in a broadcast fashion, in which case information from

22 one element is broadcast to all connected elements, or it can

transmit as a switching device in which the incoming data is

transmitted only to one element, the nearest element en route

25 to the destination. The biggest disadvantage to the star

topology in networks is that the failure of the central element

results in the failure of the entire network.

Joseph M. Kizza. Network topology. In: Computer network

security. Chattanooga: Springer, 2005, p. 15-7 (adapted).

In the text 5A5AAA,

“en route” (l.24) can be replaced by on the way without any change in the meaning of the sentence.