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A packet or frame contains the data that is being transmitted over a network. In addition to the data, a packet or frame may contain information before or after the data (called headers and trailers), which can be added by each networking protocol to tell the receiving counterpart protocol how to interpret what is being sent. Ethernet is a less expensive network solution that can be configured as either a star or a ring. Ethernet uses a contention-based logical architecture where each node on the network must contend for the right to send data and nodes must manage retransmissions when data collisions occur. When a collision is detected, each node stops sending data, waits a random amount of time, and attempts to transmit the same data again. Token Ring is a more sophisticated network that uses a token to manage data traffic. A node must possess the token before it can transmit data, and all nodes are connected at a centralized hub. Data is communicated over a Token Ring when a node has possession of the token on the ring. A node cannot communicate data when it does not possess the token. FDDI uses two rings, with data moving in the opposite direction on the two rings. When a break occurs on a ring, data is routed to the alternate ring. FDDI also uses a token, but multiple workstations can have data on the ring at the same time. Ethernet is the most popular because it is less expensive and easier to maintain than other network solutions.
Coaxial, twisted pair, and fiber optic cables are all used in networking. A token ring network passes packets of data called tokens to each station in a network. LAN - Local Area Network WAN = Wide Area Network MAN = Metropolitan Area Network Fiber-Optic - Cables designed for high transfer rates over large disances; carry light pulse signals through glass core at speeds of between 100Mbps - 1Gbps. Ethernet can use coaxial and twisted pair wiring, and can support speeds of 10mbps - 100mpbs. 10Base5 - 10 Mbps transfer rate with thick coaxial cable. 10Base2 - 10 Mbps transfer rate with thin coaxial cable. 10BaseT - 10 Mbps transfer rate, baseband transmission, with twisted pair wire. 100BaseT - 100 Mbps transfer rate, baseband transmission, with twisted pair wire. IRQ5 is usually the default interrupt for a Network Interface Card. Ethernet uses a bus topology. Although ArcNet Topology is defined as a ring, its actual construction resembles more of a star or tree like structure. User level access control permits access to resources to designated networked users if they know the password assigned to that resource. This option can be found under the "Control Panel" then the "Networks" icon and then choose "Access Control" tab in Windows 95. |
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all your tech book needs: Please Read -DISCLAIMER: Technology changes very rapidly. The information presented here was believed to be accurate at the time it was gathered. No claim is made that this information is up to date, or that it represents the current technology used today. |
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