Which of the following statement(s) is/are not true about star topology? I.…

Concept: In a star topology every node connects to the network through a single central connecting device (a hub or switch) over an independent, dedicated point-to-point link — this is the standard model assumed for star topology in networking exams. Two structural consequences follow from this design: (a) the central device sits on every path between two nodes, so it is the network's single point of failure, and (b) each link's own transmission time depends primarily on that link and the central device's forwarding capacity, not on the sheer count of other nodes attached — merely attaching another device does not, by itself, add traffic onto an existing link.

Application: Applying this to the two statements —

• Statement I: true. Because every node's path to every other node runs through the one central device, that device failing disables all communication — this is precisely the single-point-of-failure consequence above.

• Statement II: not true, as a general/inherent claim. Because each device's link to the central device is dedicated and independent, simply connecting more computers attaches more such independent links rather than adding traffic onto an existing one, so it is not automatically or inherently true that communication time rises. (In practice, heavier aggregate traffic or a central device nearing its forwarding capacity can still slow things down, but that is a function of load and hardware capacity, not an unavoidable consequence of merely adding devices — which is the sweeping claim statement II makes.)

Cross-check: This lines up with the general contrast between switched and shared-medium topologies: in a shared-medium arrangement such as a bus, or a hub used purely as a signal repeater sharing one collision domain, every device does contend for the same channel, so adding devices reliably slows communication down. A star's dedicated links remove that automatic contention — delay can still grow if overall traffic or the central device's own capacity becomes a bottleneck, but that is a conditional, load-dependent effect, not the blanket "more devices, more delay" rule statement II states.

Therefore, only statement II is not true about star topology.