power point

• Module 1: Networking Today


  Introduction to Networks v7.0 (ITN)
• Basic Device Configuration


  • For this class, we will be using Packet Tracer version 8.0
  • This is necessary for the 'Packet Tracer Physical Mode (PTPM) labs
• All Networking


  • cisco Academy
  • Cisco Packet Tracer 8.0
• Download and Install Packet Tracer


  (5:22)
• Getting Started in Packet Tracer


  (13:16)
• Networks


  • Connect Us
  • No Boundaries
• Host Roles


  • Every computer on a network is called a host or end device
  • Servers are computers that provide information to end devices
  • Clients are computers that send requests to the servers to retrieve information
• Peer-to-Peer


  • It is possible to have a device be a client and a server in a Peer-to-Peer Network
  • Advantages: Easy to set up, Less complex, Lower cost, Used for simple tasks: transferring files and sharing printers
  • Disadvantages: No centralized administration, Not as secure, Not scalable, Slower performance
• End Devices


  Where a message originates from or where it is received
• Intermediary Network Devices


  • Interconnect end devices
  • Regenerate and retransmit data signals
  • Maintain information about what pathways exist in the network
  • Notify other devices of errors and communication failures
• Network Media


  • Metal wires within cables (uses electrical impulses)
  • Glass or plastic fibers within cables (fiber-optic cable, uses pulses of light)
  • Wireless transmission (uses modulation of specific frequencies of electromagnetic waves)
• Network Representations


  • Network diagrams, often called topology diagrams, use symbols to represent devices within the network
  • Network Interface Card (NIC)
  • Physical Port
  • Interface
• Topology Diagrams


  • Physical topology diagrams illustrate the physical location of intermediary devices and cable installation
  • Logical topology diagrams illustrate devices, ports, and the addressing scheme of the network
• Networks of Many Sizes

  • Small Home Networks
  • Small Office/Home Office (SOHO)
  • Medium to Large Networks
  • World Wide Networks
• LANs and WANs


  • LAN: Network infrastructure that spans a small geographical area, interconnect end devices in a limited area, administered by a single organization or individual, provide high-speed bandwidth to internal devices
  • WAN: Network infrastructure that spans a wide geographical area, interconnect LANs over wide geographical areas, typically administered by one or more service providers, typically provide slower speed links between LANs
• The Internet


  • Worldwide collection of interconnected LANs and WANs
  • Not owned by any individual or group
  • IETF, ICANN, IAB help maintain structure
• Intranets and Extranets


  • Intranet: Private collection of LANs and WANs internal to an organization, meant to be accessible only to the organizations members or others with authorization
  • Extranet: Provides secure access to an organization's network for individuals who work for a different organization that need access to their data
• Internet Access Technologies


  • Broadband cable
  • Broadband digital subscriber line (DSL)
  • Wireless WANs
  • Mobile services
  • Business-class interconnections: business DSL, leased lines, Metro Ethernet
• Home and Small Office Internet Connections

  • Cable
  • DSL
  • Cellular
  • Satellite
  • Dial-up telephone
• Businesses Internet Connections


  • Dedicated Leased Line
  • Metro Ethernet
  • Business DSL
  • Satellite
• The Converging Network


  • Before: Separately cabled for telephone, video, and data, each using different technologies and standards
  • Now: Converged data networks carry multiple services on one link including data, voice, and video, using the same set of rules and standards
• Reliable Networks


  • Network Architecture
  • Fault Tolerance
  • Scalability
  • Quality of Service (QoS)
  • Security
• Fault Tolerance

  • Limits the impact of a failure by limiting the number of affected devices
  • Provides redundancy by implementing a packet switched network
• Scalability


  A scalable network can expand quickly and easily to support new users and applications without impacting the performance of services to existing users
• Quality of Service


  Voice and live video transmissions require higher expectations for those services being delivered
• Circuit-switched networks


  Establish dedicated circuits
• IP


  Allows for redundant connections and alternative paths if a device or link fails, providing an unaffected user experience
• Redundant connections allow for alternative paths if a device or a link fails. The user experience is unaffected.
• Scalable network


  Can expand quickly and easily to support new users and applications without impacting the performance of services to existing users
• Network designers follow accepted standards and protocols in order to make the networks scalable.
• Quality of Service (QoS)


  The primary mechanism used to ensure reliable delivery of content for all users
• With a QoS policy in place, the router can more easily manage the flow of data and voice traffic.
• Quality of Service, managed by the router, ensures that priorities are matched with the type of communication and its importance to the organization.
• Web pages can usually receive a lower priority. A Voice over IP (VoIP) Call will need priority to maintain a smooth, uninterrupted user experience.
• Network infrastructure security


  Preventing unauthorized access to the devices
• Information Security


  Protection of the information or data transmitted over the network
• Three goals of network security

  • Confidentiality - only intended recipients can read the data
  • Integrity - assurance that the data has not be altered with during transmission
  • Availability - assurance of timely and reliable access to data for authorized users
• The role of the network must adjust and continually transform in order to be able to keep up with new technologies and end user devices as they constantly come to the market.
• New networking trends that effect organizations and consumers

  • Bring Your Own Device (BYOD)
  • Online collaboration
  • Video communications
  • Cloud computing
• Bring Your Own Device (BYOD)


  Allows users to use their own devices giving them more opportunities and greater flexibility