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  1. Network Dieter W. Storr January 2002

  2. How can I connect two PC’s ?

  3. Network - Contents • Basics • KVM Switch • Network • Wireless Network • OSI Reference Model • Intranet / Internet

  4. Network - Basics SNA - Systems Network Architecture • Proprietary IBM architecture and set of implementing products for their network computing within an enterprise. • It became part of IBM’s System Application Architecture (SAA) and it is currently part of IBM’s Open Blueprint. • IBM is finding ways to combine its own SNA within the enterprise with TCP/IP in a larger network

  5. Network - Basics LAN - Local Area Networks • It’s a group of computers and associated devices that share a common communications line and typically share the resources of a single processor or server within a small geographic area (for example, within an office building). • A local area network may serve as few as two or three users (for example, in a home network) or many as thousands of users (for example, in an FDDI network).

  6. Network - Basics LAN - Local Area Networks The main local area network architectures are: • Ethernet • Token Ring • ARCnet (Attached Resource Computer Network) • FDDI (Fiber Distributed Data Interface)

  7. Network - Basics Ethernet • IEEE 802.3: Ethernet is the most widely-installed local area network (LAN) protocol. Specified in a standard, IEEE 802.3, Ethernet was originally developed by Xerox and then developed further by Xerox, DEC, and Intel. An Ethernet LAN typically uses coaxial cable or special grades of twisted pair wires.

  8. Network - Basics Ethernet • 10BASE-T: The most commonly installed Ethernet systems are called 10BASE-T and provide transmission speeds up to 10 Mbit/s. Devices are connected to the cable and compete for access using a Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol.

  9. Network - Basics Ethernet • 100BASE-T or Fast Ethernet provides transmission speeds up to 100 megabits per second and is typically used for LAN backbone systems, supporting workstations with 10BASE-T cards. • Gigabit Ethernet provides an even higher level of backbone support at 1000 megabits per second (1 gigabit or 1 billion bits per second).

  10. Network - Basics token ring • A token ring network is a local area network (LAN) in which all computers are connected in a ring or star topology and a binary digit- or token-passing scheme is used in order to prevent the collision of data between two computers that want to send messages at the same time.

  11. Network - Basics token ring • Second most widely-used protocol on LAN’s after Ethernet. The IBM Token Ring protocol led to a standard version, specified as IEEE 802.5. Data transfer rates of either 4 or 16 megabits per second.

  12. Network - Basics ARCnet (Attached Resource Computer network) • ARCnet is a widely-installed local area network (LAN) technology that uses a token-bus scheme for managing line sharing among the workstations and other devices connected on the LAN. • The LAN server continuously circulates empty message frames on a bus (a line in which every message goes through every device on the line and a device uses only those with its address).

  13. Network - Basics FDDI • FDDI (Fiber Distributed Data Interface) is a standard for data transmission on fiber optic lines in a local area network (LAN) that can extend in range up to 200 km (124 miles). • The FDDI protocol is based on the token ring protocol. In addition to being large geographically, an FDDI local area network can support thousands of users.

  14. Network - Basics FDDI • An FDDI network contains two token rings, one for possible backup in case the primary ring fails. • The primary ring offers up to 100 Mbps capacity. If the secondary ring is not needed for backup, it can also carry data, extending capacity to 200 Mbps. • The single ring can extend the maximum distance; a dual ring can extend 100 km (62 miles).

  15. Network - Basics Hub / Switch / Bridge / Router • In data communications, a hub is a place of convergence where data arrives from one or more directions and is forwarded out in one or more other directions. A hub usually includes a switch of some kind.See USB 7-Port HubTo connect severalUSB devices

  16. Network - Basics Hub / Switch / Bridge / Router • In telecommunications, a switch is a network device that selects a path or circuit for sending a unit of data to its next destination. See 8-Port Network Switch

  17. Network - Basics Hub / Switch / Bridge / Router • A switch may also include the function of the router, a device or program that can determine the route and specifically what adjacent network point the data should be sent to. • In general, a switch is a simpler and faster mechanism than a router, which requires knowledge about the network and how to determine the route

  18. Network - Basics Hub / Switch / Bridge / Router • In telecommunication networks, a bridge is a product that connects a local area network (LAN) to another local area network that uses the same protocol (for example, Ethernet or token ring).

  19. Network - Basics Hub / Switch / Bridge / Router • On the Internet, a router is a device or, in some cases, software in a computer, that determines the next network point to which a concept of packet should be forwarded toward its destination.See 4-Port Cable/DSL Router

  20. Network - Basics Hub / Switch / Bridge / Router • The router is connected to at least two networks and decides which way to send each information packet based on its current understanding of the state of the networks it is connected to. • A router is located at any gateway (where one network meets another), including each Internet point-of-presence. A router is often included as part of a network switch.

  21. Network - Basics LAN Server • Typically, a suite of application programs can be kept on the LAN server. Users who need an application frequently can download it once and then run it from their local hard disk. Users can order printing and other services as needed through applications run on the LAN server. Read and write access is maintained by a LAN administrator. • A LAN server may also be used as a Web server if safeguards are taken to secure internal applications and data from outside access.

  22. Network - Basics Wireless LAN • Mobility • Cost Savings • Disaster Recovery • ConcernsRadio signal interference, power management, system interoperability, network security, connection problems, installation issues, health risks

  23. Network - Basics NOS - Network Operating SystemArtisoft's LANtastic, Banyan VINES, Novell's NetWare, and Microsoft's LAN ManagerNetware, MS NT ServerOne thing comes through loud and clear in the year 2000 State of the VAR Market survey data about network operating systems (NOS). The NOS race seems to be over. Windows has won, and Netware is slowly just going away.

  24. Network - KVM Switch

  25. Network - KVM Switch • KVM Switch PS/2 Platform • Control 2 and more computers from one console. • Price starts at $74.99 • Cable Kit starts at $19.99 per Computer

  26. Network

  27. Networking Starting Kit • One 4-Port Cable/DSL Gateway Router • Two Desktop Network PCI Cards • Two 14' Snagless Molded RJ45 CAT-5e Patch Cables • Price saw at Belkin: $83.99

  28. Network Switch • 8-Port Network Switch (10/100Mbps)Package • One 8-Port Network Switch (10/100Mbps) • One Power Supply • One CD-Rom (Belkin SOHO Networking Software) • Compatible with Windows® 98, Windows® 2000, Windows® Me, Windows® XP. • Price: $87.99

  29. Network Switch • 8-Port Network Switch (10/100Mbps)Features • Share your Internet connection • Exchange data quickly between connected PCs and notebooks, share printers and other peripherals, and communicate via e-mail • Auto-sensing feature offers future scalability of 10Base-T Networks into 100Base-T Networks • Add computers to your network at anytime with the uplink port(s). • Use the dedicated bandwidth provided for each port to enjoy an efficient and error-free network • Compliant with Ethernet IEEE 802.3 and 802.3u standards

  30. Network • Ethernet Card ($24.99 per PC) already installed in most PC’s • Router - 8 port Network Switch ($87.99, e.g. Belkin) • RJ45 CAT-5e Patch Cable (starts at $6.99 per PC) • Software Windows NT or free Belkin SOHO Networking Software included w/ router

  31. Wireless Local Area Network

  32. Wireless Local Area Network • Wireless Desktop PCI Network Card ($164.99) • Wireless Desktop PCI Network Adapter ($49.99) • Wireless Network Access Point ($199.99) • Wireless Notebook Network Card ($109.99) • Wireless Cable/DSL Gateway Router ($249.99) • Wireless USB Network Adapter ($109.99) • Networking Software ($?.??)

  33. Network - Internet Access KVM Switch Internet DSL Gateway Router NAT Firewall LAN Server All Servers have access to the Internet


  35. Network - Intranet / Internet Internet Software: - Proxy Server - Cache Server - Gateway Server - Firewall Server - Router - Switch LAN Server Web Server

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