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Preamble/SOFD: Synchronize to medium. Destination Address: MAC Address of destination device. Source Address: MAC address of source device. • Length/Type: Length of frame or protocol type code. Data: Encapsulated data from OSI Layers 7 to 3. FCS: Frame Check Sequence.Broadcast: Indicates a broadcast or multicast frame. Local: indicates whether the address can be modified locally. OUI Number: Manufacturer of the NIC. Vendor Number: Unique, vendor assigned number. | Chapter 2 Switch Concepts and Configuration Part I CCNA3-1 Chapter 2-1 Switch Concepts and Configuration Key Elements of Ethernet 802.3 LANs Carrier Sense iFj5 1 6 Multiple Access IEEE 802.3 7 6 2 Destination Source Address Length Address Type Collision Collision Detection Back off algorithm Preamble start of Frame Delimiter 1 MAC Address Broadcast Local OUI OUI Number 46 to 1500 Frame Check Sequence 802.2 Header and Data Vendor Number Vendor Assignment CCNA3-2 Chapter .
