You want to add 900 VLANs to the existing 90 VLANs on a data center. Which two spanning-tree concerns must you consider? (Choose two)

990 total VLANs falls within the standard VLAN range (1-1005), so extended VLANs (1006-4094) are not required; this choice is based on a false premise.

PVST+ maintains a separate STP topology calculation per VLAN, so increasing the VLAN count from 90 to 990 means 10 times as many concurrent STP instances must converge during a topology change, increasing overall convergence time by approximately a factor of 10.

BPDU frames fully support any number of VLANs within the 802.1Q and PVST+ specifications - there is no hard VLAN count limit in the BPDU format.

STP topology diameter refers to the maximum number of switches in the longest path between any two endpoints, which is a physical design constraint independent of how many VLANs are configured.

PVST+ processes BPDUs and runs a dedicated spanning-tree state machine for each VLAN, so 990 active instances consume substantially more CPU cycles on every switch in the domain compared to 90 instances, which is a critical design concern at scale.