Aplication layer functionality and protocols session 02PPT2-W1-S2-R0.ppt
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Aplication layer functionality and protocols session 02PPT2-W1-S2-R0.ppt
- 1. Course : COMP8005 β Network and Cyber Security Period : September / February 2020-2021 Application Layer Functionality and Protocols Session 02 KDS β Name SME
- 2. These slides have been adapted from: Cisco Networking Academy Network Fundamental β Chapter 2 and Chapter 3 Communicating over the Network Application Layer Functionality and Protocols Acknowledgement
- 3. Objectives β’ Describe the structure of a network, including the devices and media that are necessary for successful communications. β’ Explain the function of protocols in network communications. β’ Explain the advantages of using a layered model to describe network functionality. β’ Describe the role of each layer in two recognized network models: The TCP/IP model and the OSI model. β’ Describe the importance of addressing and naming schemes in network communications.
- 4. Network Structure β’ Define the elements of communication β 3 common elements of communication β’ message source β’ the channel β’ message destination β’ Define a network β data or information networks capable of carrying many different types of communications
- 5. Network Structure β’ Describe how messages are communicated β Data is sent across a network in small βchunksβ called segments
- 6. Network Structure β’ Define the components of a network β Network components β’ hardware β’ software
- 7. Network Structure β’ End Devices and their Role in the Network β End devices form interface with human network & communications network β Role of end devices: β’ client β’ server β’ both client and server
- 8. Network Structure β’ Identify the role of an intermediary device in a data network and be able to contrast that role with the role of an end device β Role of an intermediary device β’ provides connectivity and ensures data flows across network
- 9. Network Structure β’ Define network media and criteria for making a network media choice β Network media β this is the channel over which a message travels
- 10. Network Types β’ Define Local Area Networks (LANs) β - A network serving a home, building or campus is considered a Local Area Network (LAN)
- 11. Network Types β’ Define Wide Area Networks (WANs) β - LANs separated by geographic distance are connected by a network known as a Wide Area Network (WAN)
- 12. Network Types β’ Define the Internet β The internet is defined as a β global mesh of interconnected networks
- 13. Network Types β’ Describe network representations
- 14. Function of Protocol in Network Communication β’ The importance of protocols and how they are used to facilitate communication over data networks β A protocol is a set of predetermined rules
- 15. Function of Protocol in Network Communication β’ Explain network protocols β Network protocols are used β to allow devices to β communicate β successfully
- 16. Function of Protocol in Network Communication β’ Describe Protocol suites and industry standards β A standard is β a process or protocol that has been endorsed by the networking industry and ratified by a standards organization
- 17. Function of Protocol in Network Communication β’ Define different protocols and how they interact
- 18. Function of Protocol in Network Communication β’ Technology independent Protocols β -Many diverse types of devices can communicate using the same sets of protocols. This is because protocols specify network functionality, not the underlying technology to support this functionality.
- 19. Layers with TCP/IP and OSI Model β’ Explain the benefits of using a layered model β Benefits include β’ assists in protocol design β’ fosters competition β’ changes in one layer do not affect other layers β’ provides a common language β
- 20. Layers with TCP/IP and OSI Model β’ Describe TCP/IP Mode
- 21. Layers with TCP/IP and OSI Model β’ Describe the Communication Process
- 22. Layers with TCP/IP and OSI Model β’ Explain protocol data units (PDU) and encapsulation
- 23. Layers with TCP/IP and OSI Model β’ Describe the process of sending and receiving messages
- 24. Layers with TCP/IP and OSI Model β’ Explain protocol and reference models β A protocol model β provides a model that closely matches the structure of a particular protocol suite. β A reference model β provides a common reference for maintaining consistency within all types of network protocols and services.
- 25. Layers with TCP/IP and OSI Model β’ Define OSI
- 26. Layers with TCP/IP and OSI Model β’ Compare OSI and TCP/IP model
- 27. Addressing and Naming Schemes β’ Explain how labels in encapsulation headers are used to manage communication in data networks
- 28. Addressing and Naming Schemes β’ Describe examples of Ethernet MAC Addresses, IP Addresses, and TCP/UDP Port numbers
- 29. Addressing and Naming Schemes β’ Explain how labels in encapsulation headers are used to manage communication in data networks
- 30. Addressing and Naming Schemes β’ Describe how information in the encapsulation header is used to identify the source and destination processes for data communication
- 31. Summary
- 33. Application Layer Functionality and Protocols
- 34. Objectives β’ Define the application layer as the source and destination of data for communication across networks. β’ Explain the role of protocols in supporting communication between server and client processes. β’ Describe the features, operation, and use of well-known TCP/IP application layer services (HTTP, DNS, SMTP).
- 35. Applications β The Interface Between Human and Data Networks β’ Explain that applications provide the means for generating and receiving data that can be transported on the network
- 36. OSI and TCP/IP Model
- 37. OSI and TCP/IP Model
- 38. OSI and TCP/IP Model
- 39. OSI and TCP/IP Model
- 40. OSI and TCP/IP Model
- 41. OSI and TCP/IP Model
- 42. OSI and TCP/IP Model β’ TCP/IP application layer protocols fit roughly into the framework of the top three layers of the OSI model: Application, Presentation and Session layers.
- 43. Application Layer β’ Provides the interface between the applications to communicate β’ Exchange data between programs running on the source and destination hosts
- 44. The Presentation Layer β’ Coding and conversion to ensure that data from the source device can be interpreted by the appropriate application on the destination device. β’ Compression and decompression of the data β’ Encryption and decryption of the data for transmission
- 45. The Session Layer β’ Create and maintain dialogs between source and destination applications. β’ Handles the exchange of information to initiate dialogs, βkeep them active βto restart sessions that are disrupted or idle for a long period of time.
- 46. OSI and TCP/IP Model β’ TCP/IP Application layer protocols β provide for the exchange of user information. β specify the format and control information. β’ Domain Name Service Protocol (DNS) β’Resolve Internet names to IP addresses. β’ Hypertext Transfer Protocol (HTTP) β’Transfer files that make up the Web pages of the World Wide Web.
- 47. OSI and TCP/IP Model β’ Simple Mail Transfer Protocol (SMTP) β’ Transfer of mail messages and attachments. β’ Telnet, a terminal emulation protocol β’ provide remote access to servers and networking devices. β’ File Transfer Protocol (FTP) β’ Interactive file transfer between systems.
- 48. Server Farm
- 49. Application Layer Software β’ Task Manager β’ Application β’ Services β’ System Operation β’ One program can be running several times. Each in its own process
- 50. Application Layer Protocol Function β’ It provide the rules for communication between application β’ Define processes on either end of the communication β’ Define the types of messages β’ Define the syntax of messages β’ Define the meaning of any information fields β’ Define how messages are sent and expected to response β’ Define interaction with the next lower layer
- 51. Client / Server Model
- 52. Client / Server Model
- 53. Servers
- 54. Server
- 55. P2P Network
- 56. P2P and Gnutella Protocol
- 57. P2P Application
- 58. DNS Service and Protocol
- 59. DNS Service and Protocol
- 60. DNS Service and Protocol
- 61. DNS Service and Protocol
- 62. DNS Service and Protocol
- 63. DNS Service and Protocol
- 64. DNS Service and Protocol
- 65. DNS Service and Protocol
- 66. WWW and HTTP Protocols
- 67. WWW and HTTP Protocols
- 68. WWW and HTTP Protocols
- 69. E-Mail Services and SMTP/POP Protocols
- 70. E-Mail Services and SMTP/POP Protocols
- 71. E-Mail Services and SMTP/POP Protocols
- 72. E-Mail Services and SMTP/POP Protocols
- 73. FTP
- 74. DHCP
- 75. DHCP
- 76. Features, Operation, and Use of TCP/IP Application Layer Services β’ Describe the features of the Telnet protocol and identify several of its uses in examining and managing networks
- 77. File Sharing Service and SMB Protocol
- 78. File Sharing Service and SMB Protocol
- 79. Telnet Service and Protocol
- 80. Telnet Service and Protocol
- 81. Telnet Service and Protocol
- 82. Telnet Service and Protocol
- 83. Summary