Figure 111 Two Components Make Up a Typical Cell

Cell

Cell headef

Payload

(5 bytes)

Data unit is a generic term that refers to a variety of information units. Some common data units are service (data units (SDUs), protocol data units, and b nd g e protocol data umts (BPDUs). SDUs ane information units from uppes- tayen protocols tha t define a service request to a lower-layer protocol. PDU is Os- terminolog y fnc a packet. BPDUs are us ed by the spa nningItree algonthm as ueHo messageo.

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