Questões para Concursos

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).

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