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Networking

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Networking

  1. 1.  Watch The Dawn of the Net
  2. 2. • Considered an open-standards protocol• Seven layers to provide networked services• Each layer has a specific function and must communicate with the layer above and below it• Describes the functions for computers to communicate• Published in 1984 by the International Organization for Standardization• Because layers only communicate directly with the layer above and below it, newer technologies are able to be introduced at any layer and be used transparently by other layers.•• Demonstrated when web browsers are able to be used regardless of operating system or network hardware p6 (Doherty, Anderson & Maggiora, 2007)
  3. 3. The OSI Model Physical What is it? Application This layer converts output from layer 2 into electrical signals that can be transmitted over Presentation the network. Session Example Network cables (CAT 5, CAT 53, CAT 6, and fiber optic cables are some of the most Transport common physical representations of networks. Network For more information Physical Layer Video Data Link Citation p6 (Doherty, Anderson & Maggiora, 2007) Physical EDTech 541 Network Project
  4. 4. The OSI Model Data Link What is it? Application This layer adds a header which identifies the layer 3 protocol in addition to the destination Presentation and source hardware address (MAC address) Session Example This layer refers to wireless, local area networks Transport (LANs), and wide area networks (MANs). For more information Network Data Link Layer Video Citation Data Link p6 (Doherty, Anderson & Maggiora, 2007) Physical EDTech 541 Network Project
  5. 5. The OSI Model Network What is it? Application This is where most communication layers do their work. This layer adds a header to the Presentation beginning of the packet to identify the source and destination Session Example Transport Routers are responsible for directing network traffic from a specific location to another location through packets. Network For more information Network Layer Video Data Link Citation p7 (Doherty, Anderson & Maggiora, 2007) Physical EDTech 541 Network Project
  6. 6. The OSI Model Transport What is it? Application This layer takes data from the application and breaks it into smaller pieces and adds a Presentation header to identify the sending/receiving application. These pieces of data along with their headers are called packets. Session Example HTTPS and SSL are often seen when shopping Transport online or engaging in secure transactions. For more information Network Transport Layer Video Citation Data Link p7 (Doherty, Anderson & Maggiora, 2007) Physical EDTech 541 Network Project
  7. 7. The OSI Model Session What is it? Application This layer is responsible for managing connections between hosts. Presentation Example Session Video Conferencing (Skype, Google Voice, WebEx, Go2Meeting). When functioning properly, this layer allows for the audio and Transport video to be streamed synchronously. For more information Network Session Layer Video Citation Data Link p7 (Doherty, Anderson & Maggiora, 2007) Physical EDTech 541 Network Project
  8. 8. The OSI Model Presentation What is it? Application This layer formats the data for the application. Presentation Example Accessing Secure Content. The presentation Session layer is where encryption and decryption for secure content occurs. It is his layer which communicates with the application to display Transport the data session layer to obtain the data. For more information Network Presentation Layer video Citation Data Link p7 (Doherty, Anderson & Maggiora, 2007) Physical EDTech 541 Network Project
  9. 9. The OSI Model Application What is it? Application Provides services to a user or an application Presentation Example Sending Email. The application layer takes the Session data from the email application and prepares it to be transmitted through the network and layers 6, 5, 4, 3, 2, and 1 Transport For more information The Application Layer Network Citation p7 (Doherty, Anderson & Maggiora, 2007) Data Link Physical EDTech 541 Network Project
  10. 10.  While watching The Dawn of the Net, see if you can identify examples of the seven layers of the OSI model. Ready to apply your skills? Play the OSI Game Find real world examples of the OSI Model
  11. 11. Works CitedDoherty, J., Anderson, N., & Maggiora, P. (2007). Cisco networkingsimplified. (2 ed.). Cisco Press.

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