ibps-so 2016 · Question 49 of 394

Chandrabhaga Urban Bank has eleven hundred branches spread over four states, together with a data centre at Pune and a disaster-recovery site at Hyderabad. Within a single branch the workstations are joined to one another by cabling that the bank has itself laid and owns, over distances of a few tens of metres, at high speed and with negligible delay. Between the branches and the data centre, however, the bank owns no cable at all: it hires circuits from licensed carriers, the distances run to hundreds of kilometres, the bit rates are far lower than those within the branch, and the delay is measurable and must be allowed for in the design of the application. The principle upon which a wide area network is founded is correctly stated as follows:

1. AA WAN interconnects LANs and other networks over a large geographical area, ordinarily by means of transmission facilities hired from public carriers rather than owned by the organisation, and consequently o ers lower data rates and higher delay than the LANs it joinsCorrect
2. BA WAN is a network con ned to a single building or campus, all of whose cabling is owned by the organisation that uses it
3. CA WAN is distinguished from a LAN solely by the number of hosts attached to it, the ownership of the medium being immaterial
4. DA WAN carries only broadcast tra c, every station upon it receiving every frame that any station transmits
5. EA WAN operates entirely at the data link layer, no logical addressing or routing being required within it Directions (Q50–Q54) : This set puts to the test the closeness with which a candidate follows a chain of comparisons of the sort thrown up whenever the gures of a number of accounts, o ces or units of a bank are ranged one against another. Each question sets down certain statements and, below them, two conclusions numbered I and II. Treat the statements as true however far they may stand from what is commonly known to be the case, and then say which of the two conclusions, if either of them at all, is placed beyond doubt by what has been stated. Mark your answer accordingly.