Open Systems Interconnection (OSI) Essay

Lab 2.1 Exercise 2.1.1 All these elements are necessary because each allows the other to function and do its job. Without Media the signal cannot transmit. Without Interface the computer cannot access the Media. Without the signal the electricity or copper wires cannot transmit information. Without Pattern there would be no established format for the signals. And timing lets the devices know when the pattern starts and ends. Exercise 2.1.2 Almost all networks in use today are based in some fashion on the Open Systems Interconnection (OSI) standard. The core of this standard is the OSI Reference Model, a set of seven layers that define the different stages that data must go through to travel from one device to another over a network. But the OSI is just a guideline. Exercise 2.1.3 The other networking services are: RIP Listener Simple TCP/IP Services UPnP User Interface Exercise 2.1.4 Wi-Fi wireless networks support ad hoc connections between devices. Ad hoc Wi-Fi networks are pure peer to peer compared to those utilizing wireless routers as an intermediate device. Exercise 2.1.5 Lab 2.1 Review 1) A peripheral device is an internal or external device that connects directly to a computer but does not contribute to the computer’s primary function. It helps access and use the functionalities of a computer. (ex. Mouse, flash drive, printer) Network devices are components used to connect computers or other electronic devices together so that they can share files or resources. (ex. Router, dsl filter, Ethernet cable) 2) The fewer amount of connections the fast the connection speed with the current connections. 3) A peer-to-peer (P2P) network is created when two or more PCs are connected and share resources without going through a separate server computer. Benefits: 1) It is easy to install and so is the configuration of computers on this network. 2) All the resources and contents are shared by all the peers, unlike server-client architecture where Server shares all the contents and resources. 3) P2P is more reliable as central dependency is eliminated. Failure of one peer doesn’t affect the functioning of other peers. In case of Client –Server network, if server goes down whole network gets affected. 4) There is no need for full-time System Administrator. Every user is the administrator of his machine. User can control their shared resources.