Term
| Delimitation (LAN Encapsulation) |
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Definition
| Provided in the Data Link Layer header and trailer, identifies the start and end of each frame and its payload from the Data Link Layer header and trailer allowing frames at the Data Link Layer to be distinguished from each other. |
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Term
| Protocol Identification (LAN Encapsulation) |
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Definition
| Provided in the Data Link Layer header and trailer, this allows protocols to be distinguished from each other. |
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Term
| Addressing (LAN Encapsulation) |
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Definition
| Provided in the Data Link Layer header and trailer, for shared-access LAN technologies such as Ethernet, the source node and destination node must be identified. |
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Term
| Bit-Level Integrity (LAN Encapsulation) |
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Definition
| Provided in the Data Link Layer header and trailer,a checksum is included in the frame header or trailer. In addition to the checksums provided by upper layer protocols such as IP or TCP. If checksums do not match the frame is silently discarded. |
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Term
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Definition
| Manifests itself as a header and trailer. Corresponds to the information on the frame at the Logical Link Control (LLC) and Media Access Control (MAC) sublayers of the Data Link Layer. |
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Term
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Definition
| Network which features carrier sense in which the transmitter listens before attempting to transmit. |
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Term
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Definition
| 10-Mbps and made an international standard IEEE 802.3. |
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Definition
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Term
Preamble
(Ethernet II Header and Trailer) |
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Definition
8 bytes long and consists of 7 bytes of alternating 1s and 0s. to synchronize a receiving station and a 1-byte 10101011 sequence that indicates the start of a frame.
Provides receiver synchronization and frame delimitation services.
Not visible with Network Monitor |
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Term
Destination Address
(Ethernet II Header and Trailer) |
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Definition
6 bytes long and indicates the destination's address. The destination can be a unicast, multicast or the Ethernet broadcast address.
Unicast address is also known as an individual, physical, hardware or MAC address.
For the Ethernet broadcast address, all 48 bit s are set to 1 to create the address 0xFF-FF-FF-FF-FF-FF. |
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Term
Source Address
(Ethernet II Header and Trailer) |
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Definition
| A field that is 6 bytes long and indicates the sending node's unicast address. |
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Term
EtherType
(Ethernet II Header and Trailer) |
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Definition
This field is 2 bytes long and indicates the upper layer protocol contained within the Ethernet frame.
This field's value is used to pass the Ethernet payload to the appropriate upper layer protocol.
Acts as the protocol identifier for the Ethernet II frame format. |
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Term
Payload
(Ethernet II Header and Trailer) |
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Definition
This field consists of a protocol data unit (PDU) of an upper layer protocol. A maximum size of 1500 bytes can be sent.
A minimum size of 46 bytes must be sent due to Ethernet's collision detection facility. PDU must be "padded" if it is under 46 bytes. |
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Term
Frame Check Sequence
(Ethernet II Header and Trailer) |
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Definition
4 byte field that provides bit-level integrity verification on the bits in the Ethernet II frame. Also called a cyclical redundancy check (CRC).
The CRC is calculated by the source node and placed in this field. When received by the destination device, the same CRC algorithm is run and is compared with the one placed in this field by the source node. This determines if the frame is considered valid or discarded.
Provides only a bit level integrity service not a data integrity or authentication service.
Provides bit-level error detection, not error recovery. |
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