Discussion
In a large enterprise network, which situation most strongly indicates the need for implementing VLANs rather than adding more physical switches ?
Answer: B
The strongest indication is that devices need to be grouped logically rather than physically.
A VLAN groups switch ports into a separate broadcast domain by configuration. Users of one department can be put in the same network even when they sit on different floors or switches, and separated from other departments on the same switch, without rewiring or buying hardware. When the need is grouping by function rather than location, VLANs are the answer.
Saturated trunk links need more bandwidth, which VLANs do not supply. Collision domains are already confined to each switch port, so they are not the issue. And VLANs increase the number of broadcast domains by splitting one large one into several, so option D has it backwards.
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