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Communication and Networking Services Networking Services.

Mar 31, 2015

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emma-abbe

  • Slide 1

Communication and Networking Services Networking Services Slide 2 Objectives List advantages of networked computing relative to standalone computing Identify elements of a network Describe several specific uses of a network Slide 3 Objectives Distinguish between client/server and peer-to-peer networks Identify some of the certifications available to networking professionals Identify kinds of non-technical, or soft, skills to help in succeeding as a networking professional Slide 4 Networks and Standalone Computers Network Group of computers and other devices connected by some type of transmission media Group of computers and other devices connected by some type of transmission media Networks enable users to share devices and data, collectively called a network s resources Networks enable users to share devices and data, collectively called a network s resources Standalone computer Uses programs and data only from its local disks and is not connected to a network Uses programs and data only from its local disks and is not connected to a network Slide 5 Sneakernet Method of sharing data by copying it to a disk and carrying the disk from computer to computer Figure 1-1: Data sharing before the advent of networks Slide 6 Local and Remote Computers Local computer Computer on which user is working Computer on which user is working Remote computer Computer that user controls or works on via network connection Computer that user controls or works on via network connection Slide 7 Peer-to-Peer Network Computers communicate on single segment of cable and share each other s data and devices Simple example of a local area network (LAN) Figure 1-2: Simple peer-to-peer network Slide 8 Local Area Network (LAN) Network of computers and other devices confined to relatively small space LANs involving many computers are usually server-based On a server-based network, special computers (known as servers ) process data for and facilitate communication between other computers on the network (known as clients ) On a server-based network, special computers (known as servers ) process data for and facilitate communication between other computers on the network (known as clients ) Slide 9 Networking Basics Workstation Computer that typically runs a desktop operating system and connects to a network Computer that typically runs a desktop operating system and connects to a network Client/server architecture Networking model in which clients use central server to share applications, devices, and data Networking model in which clients use central server to share applications, devices, and data Slide 10 Networking Basics Client/server network Network based on client/server architecture Network based on client/server architecture Network operating system Special software designed to manage data and other resources on a server for a number of clients Special software designed to manage data and other resources on a server for a number of clients Slide 11 Networking Basics Figure 1-3: LAN with a file server Slide 12 Networking Basics Figure 1-4: An example of a complex network Slide 13 Advantages of Server-Based over Peer-to-Peer Networks User login accounts and passwords can be assigned in one place Access to multiple shared resources can be centrally granted Servers are optimized to handle heavy processing loads and dedicated to handling requests from clients Servers can connect more than a handful of computers Slide 14 MANs and WANs Metropolitan area network (MAN) Network connecting clients and servers in multiple buildings within limited geographic area Network connecting clients and servers in multiple buildings within limited geographic area Wide area network (WAN) Network that spans large distance and connects two or more LANs Network that spans large distance and connects two or more LANs The Internet is an example of a very intricate and extensive WAN that spans the globe The Internet is an example of a very intricate and extensive WAN that spans the globe Slide 15 WAN Figure 1-5: A simple WAN Slide 16 Elements Common to All Server-Based Networks Client In addition to referring to a computer on the network, may also refers to human user of client workstation In addition to referring to a computer on the network, may also refers to human user of client workstationServerWorkstation Network interface card (NIC) Enables workstation to connect to the network and communicate with other computers Enables workstation to connect to the network and communicate with other computers Slide 17 Elements Common to All Server-Based Networks Figure 1-6: A network interface card (NIC) Slide 18 Network operating system (NOS) Host Server that manages shared resources Server that manages shared resourcesNode Client, server, or other device that can communicate over a network and that is identified by a unique identifying number, known as its network address Client, server, or other device that can communicate over a network and that is identified by a unique identifying number, known as its network address Elements Common to All Server-Based Networks Slide 19 Topology Physical layout of computer network Physical layout of computer network Figure 1-7: Commonly used network topologies Slide 20 Elements Common to All Server-Based Networks Protocol Rules network uses to transfer data Rules network uses to transfer data Data Packets The distinct units of data transmitted from one computer to another on a network The distinct units of data transmitted from one computer to another on a network Slide 21 Elements Common to All Server-Based Networks Addressing Scheme for assigning unique identifying number to every workstation on network Scheme for assigning unique identifying number to every workstation on network The number that uniquely identifies each workstation and device on a network is its address The number that uniquely identifies each workstation and device on a network is its address Slide 22 Elements Common to All Server-Based Networks Transmission media Means through which data are transmitted and received Means through which data are transmitted and received Figure 1-8: Examples of network transmission media Slide 23 How Networks Are Used Services Features provided by a network Features provided by a network File and print services Communications services Mail services Internet services Management services Slide 24 Network Services File services Refers to capability of a server to share data files, applications, and disk storage space Refers to capability of a server to share data files, applications, and disk storage space Server that provides file services is called a file server Server that provides file services is called a file server Print services Allows printers to be shared by several users on a network Allows printers to be shared by several users on a network Slide 25 Network Services Communications services Allow remote users to connect to a network Allow remote users to connect to a network Remote user Person working on a computer in a different geographical location from the LAN s server Person working on a computer in a different geographical location from the LAN s server Communications server Communications server Server that runs communications services Also referred to as access servers and remote access servers Slide 26 Network Services Mail services Coordinate storage and transfer of e-mail between users on a network Coordinate storage and transfer of e-mail between users on a networkGateway Combination of software and hardware enabling two different kinds of networks to exchange data Combination of software and hardware enabling two different kinds of networks to exchange data Internet services Enable networks to communicate with the Internet Enable networks to communicate with the Internet Slide 27 Network Services Management services Centrally administer and simplify complicated management tasks on the network Centrally administer and simplify complicated management tasks on the network Numerous services fall under category of network management Numerous services fall under category of network management Slide 28 Important Management Services Traffic monitoring and control Traffic Traffic Data transmission and processing activity taking place on a computer network at any given time Segment Segment Part of LAN that is logically separated from other parts of LAN and that shares fixed amount of traffic capacity Slide 29 Important Management Services Load balancing Distributing process activity evenly across a network so that no single device is overwhelmed Distributing process activity evenly across a network so that no single device is overwhelmed Hardware diagnosis and failure alert Determining when a network component fails and automatically notifying network administrators through e-mail or pager Determining when a network component fails and automatically notifying network administrators through e-mail or pager Slide 30 Important Management Services Asset management Collecting and storing data on number and types of software and hardware assets in an organization s network Collecting and storing data on number and types of software and hardware assets in an organization s network License tracking Determining how many copies of a single application are currently in use on a network Determining how many copies of a single application are currently in use on a network Slide 31 Important Management Services Security auditing Evaluating what security measures are currently in force and notifying network administrator if a security breach occurs Evaluating what security measures are currently in force and notifying network administrator if a security breach occurs Software distribution Automatically transferring data file or program from the server to a client on the network Automatically transferring data file or program from the server to a client on the network Slide 32