Computer+Networks+02

Computer+Networks+02 - FDDI FDDI Fiber Distributed Data...

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Unformatted text preview: FDDI FDDI Fiber Distributed Data Interface (FDDI) Standard is ANSI X3T9.5 . Topology is ring with two counter rotating rings for reliability with no hubs. Cable type is fiber-optic. Connectors are specialized. The media access method is token passing. The maximum length is 100 kilometers. The maximum number of nodes on the network is 500. Speed is 100 Mbps. FDDI is normally used as a backbone to link other networks. A typical FDDI network can include servers, concentrators, and links to other networks. Devices called concentrators provide functions similar to hubs. Most concentrators use dual attachment station network cards but single attachment concentrators may be used to attach more workstations to the network. FDDI token passing allows multiple frames to circulate around the ring at the same time. Priority levels of a data frame and token can be set to allow servers to send more data frames. Time sensitive data may also be given higher priority. The second ring in a FDDI network is a method of adjusting when there are breaks in the cable. The primary ring is normally used, but if the nearest downstream neighbor stops responding the data is sent on the secondary ring in attempt to reach the computer. Therefore a break in the cable will result in the secondary ring being used. There are two network cards which are: 1. Dual attachment stations (DAS) used for servers and concentrators are attached to both rings. 2. Single Attachment stations (SAS) attached to one ring and used to attach workstations to concentrators. A router or switch can link an FDDI network to a local area network (LAN). Normally FDDI is used to link LANs together since it covers long distances. IPX/SPX IPX/SPX IPX/SPX is a routable protocol and can be used for small and large networks. The following protocols are part of the IPX/SPX suite: ● SAP - Service Advertising Protocol packets are used by file and print servers to periodically advertise the address of the server and the services available. It works at the application, presentation, and session levels. ● NCP - NetWare Core Protocol provides for client/server interactions such as file and print sharing. It works at the application, presentation, and session levels. ● SPX - Sequenced Packet Exchange operates at the transport layer providing connection oriented communication on top of IPX. ● IPX - Internetwork Packet Exchange supports the transport and network layers of the OSI network model. Provides for network addressing and routing. It provides fast, unreliable, communication with network nodes using a connection less datagram service. ● RIP - Routing Information Protocol is the default routing protocol for IPX/SPX networks which operates at the network layer. A distance-vector algorithm is used to calculate the best route for a packet....
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Computer+Networks+02 - FDDI FDDI Fiber Distributed Data...

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