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S7C2 – Legacy Ethernet

S7C2 – Legacy Ethernet. From the Old to the New. Legacy Ethernet Characteristics. CSMA/CD Shared Bandwidth 10 Mbps Common Broadcast Physical Star Topology; logical bus. Broadcasts. Ethernet characteristic Routers use to announce routing tables ARP request. To Increase Bandwidth.

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S7C2 – Legacy Ethernet

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  1. S7C2 – Legacy Ethernet From the Old to the New

  2. Legacy Ethernet Characteristics • CSMA/CD • Shared Bandwidth • 10 Mbps • Common Broadcast • Physical Star Topology; logical bus

  3. Broadcasts • Ethernet characteristic • Routers use to announce routing tables • ARP request

  4. To Increase Bandwidth • Upgrade the user to 10BASE-T full duplex and immediately double the bandwidth. • Upgrade the user to 100BASE-X half duplex. • Upgrade the user to 100BASE-X full duplex

  5. Frame Transmission • Unicast • One source to one destination • Multicast • Single data stream from one source to multiple clients • Saves bandwidth and controls network traffic • Broadcast • Single data stream to all hosts on the subnet

  6. Multicast • Cisco has a special multicast address reserved, 01-00-0C-CC-CC-CC, which enables Cisco devices to transmit to all other Cisco devices on the segment. • The reserved multicast OSPF IP addresses 224.0.0.5 and 224.0.0.6 translates to MAC multicast addresses of 01-00-5E-00-00-05 and 01-00-5E-00-00-06.

  7. LAN FRAMES • Layer 2 Header – 14 octets • MAC DA 6 octets • MAC SA 6 octets • Type (Ev2) or length (802.3/802.2) 2 octets • Layer 2 Data field – 1500 octets • V2 and 802.3 data • 802.2 DSAP, SSAP, Control, Data

  8. Duplex • Half-Duplex • Transmit and Receive wires • Relies on Collision Detection • Full-Duplex • No loopback • No collision detection • Full duplex ethernet controller • Transmit circuit connects directly to receive circuit • No collisions • Significant performance improvement (almost 100%) • Eliminates contention for line • Uses single port for each full-duplex connection

  9. Media Comparisons

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