Lecture Wireless and mobile computing – Chapter 13: Protocols and protocol suit review. The following will be discussed in this chapter: Network access layer, transport layer, protocols, protocol data unit, protocol architecture, TCP/IP stack, layered approach and its advantages, router. | Protocols and Protocol Suit Review Lecture 13 Overview Network Access Layer Transport Layer Protocols Protocol Data Unit Protocol Architecture TCP/IP Stack Layered Approach and its Advantages Router Network Access Layer Q:- What is the major function of the network access layer? OSI Model Physical Data link Network Transport Session Presentation Application Layer 1 Layer 2 Layer 3 Layer 4 Layer 5 Layer 6 Layer 7 7 layers OSI model Physical Layer Functions Establishment and termination of a connection to a communication medium Process for effective use of communication resources (., contention resolution and flow control) Conversion between representation of digital data in the end user’s equipment The physical layer is responsible for movements of individual bits from one hop (node) to the next. Data Link Layer Functions Responds to service requests from the network layer and issues requests to the physical layer. Provides functional and procedural means to transfer data between network entities and to detect and correct errors that may occur in the physical layer. Concerned with: Framing Physical addressing (MAC address) Flow Control Error Control Access Control The data link layer is responsible for moving frames from one hop (node) to the next. Hop-to-hop Delivery Network Layer Functions Provides for transfer of variable length sequences from source to destination via one or more networks Responds to service requests from the transport layer and issues requests to the data link layer Concerned with: Data Packet Logical addressing (IP address) Routing The network layer is responsible for the delivery of individual packets from the source host to the destination host. Source to Destination Delivery Transport Layer Functions Provides transparent data transfer between end users Responds to service requests from the session layer and issues requests to the network layer. Concerned with: Service-point addressing | Protocols and Protocol Suit Review Lecture 13 Overview Network Access Layer Transport Layer Protocols Protocol Data Unit Protocol Architecture TCP/IP Stack Layered Approach and its Advantages Router Network Access Layer Q:- What is the major function of the network access layer? OSI Model Physical Data link Network Transport Session Presentation Application Layer 1 Layer 2 Layer 3 Layer 4 Layer 5 Layer 6 Layer 7 7 layers OSI model Physical Layer Functions Establishment and termination of a connection to a communication medium Process for effective use of communication resources (., contention resolution and flow control) Conversion between representation of digital data in the end user’s equipment The physical layer is responsible for movements of individual bits from one hop (node) to the next. Data Link Layer Functions Responds to service requests from the network layer and issues requests to the physical layer. Provides functional and procedural .
