lesson 3 – understanding networking. network relationship types network features osi networking...

Download Lesson 3 – UNDERSTANDING NETWORKING. Network relationship types Network features OSI Networking model Network hardware components OVERVIEW

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  • Slide 1
  • Lesson 3 UNDERSTANDING NETWORKING
  • Slide 2
  • Network relationship types Network features OSI Networking model Network hardware components OVERVIEW
  • Slide 3
  • Peer-to-peer Client / server NETWORK RELATIONSHIP TYPES
  • Slide 4
  • Computers on the Network communicate with each other as equals. Peer-to-peer relationships
  • Slide 5
  • Each computer: Shares resources. Sets up and maintains security. Accesses Network resources. Peer-to-peer relationships
  • Slide 6
  • Slide 7
  • A distinction exists between computers that make available Network resources and computers that use those resources. Client / server relationships
  • Slide 8
  • Resources are centrally managed and hosted. Client computers do not share resources with other client computers / servers. Server computers make available, manage, and administer shared resources. Client / server relationships
  • Slide 9
  • Slide 10
  • Use less expensive hardware. Easy to administer. No NOS required. More built-in redundancy. Pros for Peer-to-peer Networks
  • Slide 11
  • May hurt users performance. Not very secure. Hard to back up. Cons for Peer-to-peer Networks
  • Slide 12
  • Very secure. Better performance. Centralized back up. Very reliable. Pros for Client / server Networks
  • Slide 13
  • Require professional administration. More hardware intensive. Cons for Client / server Networks
  • Slide 14
  • File sharing Printer sharing Application services E-mail Remote Access Wide Area Network Internet and intranet Network security NETWORK FEATURES
  • Slide 15
  • Originally, the primary reason to have a Network. Provides central storage for common documents, databases, and work files. Requires a shared directory or disk drive. Incorporates File Locking. File sharing
  • Slide 16
  • Most common ways of sharing printers are: Printer queues. Workstations that access printers directly. Printer sharing
  • Slide 17
  • Printer server function can be filled by: A fileserver with the printer connected to it. A computer connected to the Network, with the printer connected to the computer. An in-built print server on a printers NIC. A dedicated Network print server. Printer sharing
  • Slide 18
  • Advantages: Reduces disk space needed. Easier to administer the application. Application services
  • Slide 19
  • E-mail systems are divided into: File-based. Client / server. E-mail
  • Slide 20
  • File-based e-mail system: Consists of a set of files kept in a shared location on a server. E-mail
  • Slide 21
  • Client / server based e-mail system: Contains messages and handles e-mail interconnections, inside and outside the company. E-mail
  • Slide 22
  • Users use this feature to access files and e-mail from a remote location, such as their homes. Remote Access
  • Slide 23
  • Methods: Set up Remote Access Service (RAS) connection on a Windows NT server. Use a dedicated RAS. Employ a workstation on the Network. Set up a Virtual Private Network (VPN). Install Windows Terminal Server or Citrix MetaFrame. Remote Access
  • Slide 24
  • WAN is the connection of multiple Local Area Networks (LANs). It is created when users of one LAN need frequent access to the resources on another LAN. Wide Area Network
  • Slide 25
  • An Internet connection for a Network consists of a telecommunications network connection to an Internet Service Provider (ISP). Internet and intranet
  • Slide 26
  • Network components : Leased 56KB line ISDN line, or a fractional or full DS1 (T-1) connection Channel Service Unit / Data Service Unit (CSU/DSU) Router Firewall Web server Internet and intranet
  • Slide 27
  • This internally focused Network: Mimics the Internet. May also host Internet-type services like FTP servers. Is not usually accessible from outside the LAN. Internet and Intranet
  • Slide 28
  • Provided by: Features of the NOS. Physical cabling plant. The Networks connection with other Networks. Client workstations. Actions of the users. Security policies. Etc. Network security
  • Slide 29
  • Conceptual model. Used in Network design and engineering Network solutions. Defines methods and protocols needed to connect one computer to another. OSI NETWORKING MODEL
  • Slide 30
  • The 7 layered OSI Model
  • Slide 31
  • 7 layers of the OSI Model Defines the properties of the physical medium used to make a Network connection.
  • Slide 32
  • 7 layers of the OSI Model Connection can be either: Point-to-point Multipoint Transmission can be either: Half-duplex Full-duplex
  • Slide 33
  • 7 layers of the OSI Model Defines standards that assign meaning to the bits carried by the physical layer.
  • Slide 34
  • 7 layers of the OSI Model This layer is sub-divided into: Logical Link Control Medium Access Control
  • Slide 35
  • 7 layers of the OSI Model Defines how data packets get from one point to another on a Network and what goes into each packet.
  • Slide 36
  • 7 layers of the OSI Model Manages the flow of information from one Network node to another.
  • Slide 37
  • 7 layers of the OSI Model Defines the connection from a user to a Network server or from a peer on a Network to another peer.
  • Slide 38
  • 7 layers of the OSI Model Takes the data supplied by the lower-level layers and trans- forms it so it can be presented to the system.
  • Slide 39
  • 7 layers of the OSI Model Controls how the operating system and its applications interact with the Network.
  • Slide 40
  • How data travels through the OSI layers
  • Slide 41
  • Servers Hubs, Switches, and Routers Cabling and Cable Plants Workstation Hardware NETWORK HARDWARE COMPONENTS
  • Slide 42
  • A server is any computer that performs Network functions for other computers. Servers
  • Slide 43
  • Types of servers: File server. Print servers. Application servers. E-mail servers. Networking servers that provide Network services (automatic assignment of TCP/IP addresses). Servers
  • Slide 44
  • Types of servers: Routing servers (routing of packets from one Network to another). Web servers (encryption/decryption and other security services). Virtual Private Network (VPN) servers. Internet servers. Remote Access servers. Servers
  • Slide 45
  • Typically run some Network Operating System (NOS) like: Windows 2000 Server and Advanced Server Windows NT Server Novell NetWare UNIX Servers
  • Slide 46
  • A true server-class computer will have: Built-in redundancy with multiple power supplies and fans. High-performance designs. Monitoring software and hardware. Servers
  • Slide 47
  • A hub (concentrator) connects a number of network cables to a Network. Network connections on a hub share a single collision domain. Hubs, Switches, and Routers
  • Slide 48
  • A typical Network hub Hubs, Switches, and Routers
  • Slide 49
  • A switch makes a Network connection private. It collects data from each connection and forwards it to a Network backbone. Switches connect many hubs to a single backbone. Hubs, Switches, and Routers
  • Slide 50
  • Using switches and hubs in concert Hubs, Switches, and Routers
  • Slide 51
  • A router routes data packets from one Network to another. Two Networks connect to a router using their own wiring and connection type. Hubs, Switches, and Routers
  • Slide 52
  • Types of Network cable: Unshielded Twisted Pair (UTP) Shielded Twisted Pair (STP) Coaxial Cable (coax) Fiber Optic Cabling and Cable Plants
  • Slide 53
  • Any computer on a Network is referred to as a Network workstation (or Network Client). Workstation Hardware
  • Slide 54
  • Network relationship types: Peer-to-Peer networks Client / server Networks SUMMARY
  • Slide 55
  • Network features: File sharing Printer sharing Application services E-mail Remote Access Wide Area Network Internet and intranet Network security Summary
  • Slide 56
  • Open Systems Interconnect (OSI) Networking Model: Application Presentation Session Transport Network Data-link Physical Summary
  • Slide 57
  • Network Hardware Components: Server types Hubs, Switches, and Routers Summary
  • Slide 58
  • Cabling and the Physical Plant: UTP STP Coax Fiber Wireless Summary