osi vs tcp/ip
- 2. OSI Layers
- 4. OSI Physical Layer One of the major function of the physical layer is to move data in the form of electromagnetic signals across a transmission medium. Its responsible for movements of individual bits from one hop (Node) to next. Both data and the signals can be either analo g or dig ital. Transmission media work by conducting energy along a physical path which can be wired or wireless
- 5. OSI Data Link Layer Data link layer is responsible for moving frames from one hop (Node) to the next. Tasks: Framing (stream of bits into manageable data units) Physical addressing (MAC Address) Flow Control (mechanism for overwhelming the receiver) Error Control (trailer, retransmission) Access Control (defining master device in the same link)
- 6. OSI Network Layer The network layer is responsible for the delivery of individual packets from the source host to the destination host. Tasks: Logical addressing (IP Address) Routing (Source to destination transmission between networks)
- 7. OSI Transport Layer The transport layer is responsible for the delivery of a message from one process to another Tasks: Service-point addressing (Port address) Segmentation and reassembly (Sequence number) Connection control (Connectionless or connection oriented) Flow control (end to end) Error Control (Process to Process)
- 8. OSI Session Layer H5 synsyn syn FromPresentation Layer To Transport Layer Session Layer FromTransport Layer To Presentation Layer H5 synsyn syn Session Layer The session layer is responsible for dialog control and synchronization Tasks: Dialog Control (Half Duplex/Full duplex) Synchronization (Synchronization points, process inline within same page)
- 9. OSI Presentation Layer The presentation layer is responsible for translation, compression and encryption Tasks: Translation (interoperability between different encoding system) Encryption (Privacy schemes) Compression (data compression)
- 10. OSI Application Layer The application layer is responsible for providing services to the user. Tasks: Network virtual terminal (Software) File transfer, access and management Mail services Directory services (access to distributed database sources for global information about various objects and services) To Presentation Layer From Presentation Layer
- 11. TCP/IP Layers
- 13. TCP/IP Link Layer Exchange of data between end system and network Address of host and destination Prioritization of transmission Software at this layer depends on network (e.g. X.25 vs. Ethernet) Segregation means that no other software needs to be concerned about net specifics
- 14. TCP/IP Network Layer An Internet is an interconnection of two or more networks Internet layer handles tasks similar to network access layer, but between networks rather than between nodes on a network Uses IP for addressing and routing across networks Implemented in workstations and routers
- 15. TCP/IP Transport Layer Also called host-to-host layer Reliable exchange of data between applications Uses TCP protocols for transmission
- 16. TCP/IP Application Layer Logic needed to support variety of applications Separate module supports each type of application (e.g. file transfer) FTP HTTP Telnet News SMTP
- 18. OSI Vs TCP/IP OSI provides layer functioning and also defines functions of all the layers. In OSI model the transport layer guarantees the delivery of packets. Follows horizontal approach</td><td>3. TCP/IP model is more based on protocols and protocols are not flexible with other layers. In this the transport layer does not guarantees delivery of packets. Follows vertical approach. OSI(Open System Interconnection) TCP/IP(Transmission Control Protocol)
- 19. OSI model has a separate presentation layer. OSI is a general model. Network layer provide both connection oriented and connectionless service. OSI model has a problem of fitting the protocols in the model. TCP/IP does not have a separate presentation layer TCP/IP model can’t be used in any other application. The Network layer provides connectionless service. TCP/IP model does not fit OSI Vs TCP/IP OSI(Open System Interconnection) TCP/IP(Transmission Control Protocol)
- 20. Protocols are hidden in OSI model and are easily replaced as the technology changes. OSI model defines services, interfaces and protocols very clearly and makes clear distinction between them. It has 7 layers In TCP/IP replacing protocol is not easy. In TCP/IP it is not clearly separated its services, interfaces and protocols. It has 4 layers OSI(Open System Interconnection) OSI Vs TCP/IP TCP/IP(Transmission Control Protocol)
- 21. Analysis between OSI & TCP/IP