computer networking | My Assignment Tutor

9/22/20181 Unit 2: NetworkingTutor: Dr Xavier Matieni Aim of the unitThe aim of this unit is to provide studentswith wider background knowledge ofcomputer networking essentials, how theyoperate, protocols, standards, securityconsiderations and the prototypesassociated with a range of networkingtechnologies. 9/22/20182 Learning OutcomesBy the end of this unit students will be able to: LO1. Examine networking principles and theirprotocols. LO2. Explain networking devices and operations. LO3. Design efficient networked systems. LO4. Implement and diagnose networked systems LO1 Examine networking principles andtheir protocols Role of networks: Purpose, benefits, resource implications,communications, working practice, commercial opportunity,information sharing, collaboration. System types: Peer-based, client-server, cloud, cluster,centralised, virtualised. Networking standards: Conceptual models e.g. OSImodel, TCP/IP model; standards: e.g. IEEE 802.x. Topology: Logical e.g. Ethernet, Token Ring; physical, ring, bus, mesh, tree, ring. Protocols: Purpose of protocols; routed protocols e.g. IPv4,IPv6, IPv6 addressing, Global unicast, Multicast, Link local,Unique local, EUI 64, Auto configuration, FTP, HTTP, SMTP,POP3, SSL; management of protocols for addressing 9/22/20183 LO2 Explain networking devices andoperations Networking devices: Servers; hub, routers; switches;multilayer switch, firewall, HIDS, repeaters; bridges; wirelessdevices; access point (wireless/wired), content filter, Loadbalancer, Modem, Packet shaper, VPN concentrator.Networking software: Client software, server software,client operating system, server operating system, Firewall.Server type: Web, file, database, combination, virtualisation,terminal services server. Server selection: Cost, purpose, operating systemrequirement. Workstation: Hardware e.g. network card,cabling; permissions; system bus; local-system architecturee.g. memory, processor, I/O devices. LO3 Design efficient networked systems Bandwidth: Expected average load; anticipated peak load;local internet availability; cost constraints, throughput. Users: Quality expectations, concept of system growth.Networking services and applications: DHCP; static vsdynamic IP addressing, reservations, scopes, leases, options(DNS servers, Suffixes), IP helper, DHCP relay, DNS records,Dynamic DNS. Communications: Suited to devices, suited to users,supportive of lifestyle desires, supportive of commercialrequirements, security requirements, quality of service needs. Scalable: Able to support device growth, able to supportaddition of communication devices, able to cope withbandwidth use and trend changes, protocol utilisation,addressing. Selection of components: Supportinginfrastructure needs; supporting connectivity requirements 9/22/20184 LO4. Implement and diagnose networkedsystems Devices: Installation of communication devices, allocation ofaddresses, local client configuration, server configuration,server installation, security considerations. Verification of configuration and connectivity:Installation of internet work communication medium, ping,extended ping, traceroute, telnet, SSH. System monitoring: Utilisation, bandwidth needs,monitoring user productivity and security of the system.Maintenance schedule: Backups, upgrades, security, auditing.Diagnose and resolve layer 1 problems: Framing, CRC, Runts,Giants, Dropped packets, late collisions, Input/Output errors.Policy review: Bandwidth, resource availability. Learning Outcomes and AssessmentCriteriaLO1 Examine networking principles and their protocolsP1 Discuss the benefits and constraints of different network typesand standards.P2 Explain the impact of network topology, communication andbandwidth requirementsM1 Compare common networking principles and how protocolsenable the effectiveness of networked systems.D1 Considering a given scenario, identify the topology protocolselected for the efficient utilisation of a networking system. 9/22/20185 Learning Outcomes and AssessmentCriteriaLO2 Explain networking devices and operations P3 Discuss the operating principles of networking devices andserver types. P4 Discuss the interdependence of workstation hardware withrelevant networking software. M2 Explore a range of server types and justify the selection ofa server, considering a given scenario regarding cost andperformance optimisation. D1 Considering a given scenario, identify the topology protocolselected for the efficient utilisation of a networking system LO3 Design efficient networked systems P5 Design a networked system to meet a given specification. P6 Test and evaluate the design to meet the requirements andanalyse user feedback. M3 Install and configure network services and applications onyour choice D2 Design a maintenance schedule to support the networkedsystemLearning Outcomes and AssessmentCriteria 9/22/20186 Learning Outcomes and AssessmentCriteriaLO4 Implement and diagnose networked systems P7 Implement a networked system based on a prepareddesign. P8 Document and analyse test results against expected results. M4 Recommend potential enhancements for the networkedsystems D3 Use critical reflection to evaluate own work and justifyvalid conclusions. Recommended Resources TANENBAUM, A. (2002) Computer Networks. Prentice Hall PTR. Textbooks BURGESS, M. (2003) Principles of Network and System Administration.2nd Ed. John Wiley and Sons Ltd. HALLBERG, B. (2005) Networking: A Beginner’s Guide. 4th Ed.Osborne/McGraw-Hill US. LIMONCELLI, T. and HOGAN, C. (2001) The Practice of System andNetwork Administration. Addison-Wesley. LOWE, D. (2005) Networking All-in-One Desk Reference for Dummies.2nd Ed. Hungry Minds Inc. OLIFER, N. and OLIFER, V. (2005) Computer Networks: Principles,Technologies and Protocols for Network Design. John Wiley and Sons Ltd. STALLINGS, W. (2003) Data and Computer Communications. 7thEd.(Prentice Hall) SUBRAMANIAN, M. (2000) Network Management: An Introduction toPrinciples and Practice. Addison-Wesley. 9/22/20187 Recommended resourcesJournals The Institute of Engineering and TechnologyLinksThis unit links to the following related units: Unit 8: Computer Systems Architecture Unit 15: Transport Network Design Unit 17: Network Security Unit 35: Network Management Unit 36: Client/Server Computing Systems NetworkingIntroduction 9/22/20188 Class discussionIn groups of 3 or 4 students discuss the followingquestions: What is a Network? What is the role of a network? What is the difference between Data andinformation? What is a computer? What is a system? A NetworkRole of Network: a network enables differentcomponents interconnected to communicate andshare resources such as printers, files, database,internet… 9/22/20189A peer-to-peer network17A client/server network189/22/201810Networking Devices Equipment that connects directly to a network segment isreferred to as a device. These devices are broken up into two classifications.• end-user devices• network devices End-user devices include computers, printers, scanners,and other devices that provide services directly to the user. Network devices include all the devices that connect theend-user devices together to allow them to communicate.19Network Interface CardA network interface card (NIC) is a printed circuit board thatprovides network communication capabilities to and from apersonal computer. Also called a LAN adapter.209/22/201811Networking Device Icons21RepeaterA repeater is a network device used to regenerate a signal.Repeaters regenerate analog or digital signals distorted by transmission lossdue to attenuation. A repeater does not perform intelligent routing.229/22/201812Hubo Hubs concentrate connections. In otherwords, they take a group of hosts andallow the network to see them as a singleunit.o This is done passively, without anyother effect on the data transmission.o Active hubs not only concentrate hosts,but they also regenerate signals.23BridgeBridges convert network transmission data formats as well as perform basicdata transmission management. Bridges, as the name implies, provideconnections between LANs. Not only do bridges connect LANs, but they alsoperform a check on the data to determine whether it should cross the bridge ornot. This makes each part of the network more efficient.249/22/201813Workgroup SwitchWorkgroup switches addmore intelligence to datatransfer management.Switches can determinewhether data should remainon a LAN or not, and theycan transfer the data to theconnection that needs thatdata.25RouterRouters have all capabilities of the previous devices. Routers canregenerate signals, concentrate multiple connections, convertdata transmission formats, and manage data transfers. They canalso connect to a WAN, which allows them to connect LANs thatare separated by great distances.269/22/201814“The Cloud”The cloud is used in diagrams to represent where theconnection to the internet is.It also represents all of the devices on the internet.27 standards 9/22/201815 Network Standards TCP/IP vs OSI Model Standards 9/22/201816 Network Topologies Network topologies Hybrid topology 9/22/201817 Network protocols Network protocolsInternet Protocol 9/22/201818 Networking devices Networking Software 9/22/201819 Networking workstation n


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