in eect we can say that layer 2 switches bridges

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Unformatted text preview:   Frames do include fields like synchronizaPon, addressing, payload, control- informaPon etc. •  Frame Forwarding •  The process of moving frames from one port to another in a bridge or switch. 34 (c) Dr. Rahul Banerjee, BITS, Pilani, India Frames: Factors that mamer! •  Synchronization: Transmitter & Receiver need to be in sync •  Start Delimiter: Required to mark starting bit •  End Delimiter: Required to mark the end bit •  Control Information: Information suggesting data handling and interpretation •  Error Detection / Correction / Retransmission •  Flow Control: Required for avoiding data loss due to overflow at receiving end •  Data Length: Needed if data-field is not of fixed size 35 (c) Dr. Rahul Banerjee, BITS, Pilani, India A Sample Frame Format n- Byte Preamble Start- of - Frame Delimiter DesPnaPon Add. Source Address Length of Data Data Field Pad Field Checksum 36 (c) Dr. Rahul Banerjee, BITS, Pilani, India Logical View of a 10- Gbps Unit Frame Structure - 10 Gigabit Ethernet (IEEE 802.3ae for LAN, WAN and MAN) It uses the same MAC frame as the Ethernet. 7 1 6 6 2 46=<15 00 4 Pre SFD DA SA Length Type Data unit + pad FCS hmp://www.javvin.com/pics/10GigE.gif&imgrefurl=hmp://www.javvin.com/protocol10GigE.html&usg=__VuNx4T- UphUAzm- _AEsDqMqvzLQ=&h=374&w=576&sz=34&hl=en&start=10&um=1&itbs=1&tbnid=JlvKsLiP2xuOfM:&tbnh=87&tbnw=134&prev=/images%3Fq%3Dgigabit%2Bethernet%26hl%3Den%26safe%3Doff%26um%3D1 hmp://www.ovislinkcorp.co.uk/linkd.GIF Summary of Differences Between L- 2 Switches, Routers (L- 3) and L- 3 Switches •  Bridg...
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