How many bytes make up the spanning-tree bridge ID?

A.
4

B.
8

C.
12

D.
16

Explanation:
The IEEE 802.1D standard requires that each switch has an unique bridge identifier (bridge ID),
which controls the selection of the root switch. Because each VLAN is considered as a different
logical bridge with PVST+ and rapid PVST+, the same switch must have a different bridge IDs for
each configured VLAN. Each VLAN on the switch has a unique 8-byte bridge ID. The 2 mostsignificant bytes are used for the switch priority, and the remaining 6 bytes are derived from the
switch MAC address.