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Module Three

N thicknet 10bases coax with segments up to 500

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n Thicknet – 10BaseS – coax with segments up to 500 meters. n UTP – Unshielded Twisted Pair – all devices connected to a hub or switch 10BaseT 10 Mbps, 100BaseT 100 Mbps and 1000BaseT 1 GBps ARCnet – 802.5 n Early LAN technologies n Uses token passing in a Star topology on coax cable. Token Ring n Second to Ethernet n All end stations connected to a Multistation Access Unit (MSAU) n One station is designated as the Active Monitor n If a transmitting station fails, the Active monitor will remove the token and generate a new one. Fiber Distributed Data Interface – FDDI n Dual token ring LAN at 100 MBps on Fiber n Dual counter rotating rings only one active at a time n Operates over long distances with minimal interference n Predictable delays, deterministic n Permits several tokens to be present at a time n Expensive and requires expertise n Copper Distributed Data Interface (CDDI) – can be used with UTP cable but subject to interference and length issues associated with Copper. LAN Devices Repeaters – amplify signal, no added intelligence, no filtering – Physical Layer (1) Hubs – used to connect multiple LAN devices, no added intelligence – Physical Layer (1) Bridges – Amplify signal, add some intelligence. A bridge forwards the data to all other network segments if the Media Access Control (MAC) or hardware address of the destination computer is not on the local network segment. Automatically forwards all broadcast traffic. Does not use IP address because IP is contained in the Network Layer (3) Data Link Layer (2) Switches – Will only send data to the port where the destination MAC address is, not to all ports. Primarily operate at the Data Link Layer (2), although extremely fast layer 3 devices combining switching and routing are being used. Routers – router opens packet and looks at either the MAC or IP address only forwards to the network that it is destined. Operates at Network Layer (3) Gateways – primarily software, can be multi-protocol, can examine entire packet. Asynchronous Transfer Mode (ATM) Switches – Used in WANs and CANs. Use cell relay technology. LAN Extenders – remote access multi layer switch connected to host router, filters based on MAC address or Network Layer protocol, not capable of firewalling. WAN Technologies Rules for communicating between computers on a WAN
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Communications between large disparate networks. Private Circuit Technologies Evolved before packet switching networks. Dedicated analog or digital point-to-point connection. Serial Line Internet Protocol (SLIP), Point-to Point protocol (PPP), ISDN, xDSL. n Dedicated Line – indefinitely and continuously reserve for transmissions. n Leased Line – Type of dedicated line leased from carrier. Types and Speeds of Leased Lines: n Digital Signal Level 0 – DS-0 – single channel at 64KBps on a T1 n Digital Signal Level 1 – DS-1 – 1.544 MBps in US on a T1 and 2.108 MBps in Europe on a E1 n Digital Signal Level 3 – DS-3 – 44.736 MBps on a T3 n T1 – Transmits DS-1 data at 1.544 MBps on telephone switching network n T3 – Transmits DS-3 data at 44.736 MBps on telephone switching network
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n Thicknet 10BaseS coax with segments up to 500 meters n...

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