3. In other words networking can be defined as inter-connection of two or more computers for sharing the resources(hardware and software)and provide security on them.
12. LANs in turn may be plugged into larger networks, such as larger LANs or wide area networks (WANs), connecting many computers within an organization to each other and/or to the Internet.
13. Typically, connected devices share the resources of a single processor or server within a small geographic area (for example, within an office building).
14.
15. WAN is a network that uses routers and public communications links.
16. The largest and most well-known example of a WAN is the Internet. A WAN is a data communications network that covers a relatively broad geographic area (i.e. one city to another and one country to another country) and that often uses transmission facilities provided by common carriers, such as telephone companies.
19. The term is applied to the interconnection of networks in a city into a single larger network (which may then also offer efficient connection to a wide area network).
20.
21. Examples of devices that are used in a PAN are :printers, fax machines, telephones, PDAs and scanners.
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24. A VPN may have best-effort performance, or may have a defined service level agreement (SLA) between the VPN customer and the VPN service provider. Generally, a VPN has a topology more complex than point-to-point.
43. All the computers must have adequate number of interfaces for the connections to be made. Because of this requirement the installations is somewhat difficult.
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45.
46. It consists of groups of star-configured workstations connected to a linear bus backbone cable.
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48.
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50. In addition, some method of connecting these building blocks is required, usually in the form of galvanic cable .
51.
52. REPEATERS
53. NETWORK HUB
54. NETWORK BRIDGE
55. NETWORK SWITCH
56.
57.
58.
59. When a packet arrives at one port, it is copied unmodified to all ports of the hub for transmission.
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61.
62. Bridges do not promiscuously copy traffic to all ports, as hubs do, but learn which MAC addresses are reachable through specific ports.
63. Once the bridge associates a port and an address, it will send traffic for that address only to that port.
64.
65. Remote bridges: Can be used to create a wide area network (WAN) link between LANs. Remote bridges, where the connecting link is slower than the end networks, largely have been replaced by routers.
66.
67. Strictly speaking, a switch is not capable of routing traffic based on IP address which is necessary for communicating between network segments or within a large or complex LAN.
68. A switch normally has numerous ports, with the intention being that most or all of the network is connected directly to the switch, or another switch that is in turn connected to a switch. Switch is a marketing term that encompasses routers and bridges, as well as devices that may distribute traffic on load or by application content.
79. Data transfer rate: is the speed at which data can be transferred between sender and receiver in a network, once transmission has begun. (bit/sec) .