Network layers2.pptx new handouts Information

Network layers2.pptx new handouts Information

1. ICT C o C Hardware and Networking Service Layered Models Abren Endeg

2. ICT C o C Hardware and Networking Service Layered Models Abren Endeg

3. ICT C o C 1 OSI (Open System Interconnection) 2 TCP/IP Transmission Control Protocol/Internet Protocol There are two types of layered models Abren Endeg

4. ICT C o C OSI model layer Abren Endeg

5. ICT C o C OSI reference Model It was developed by ISO (International Standardization Organizations) OSI is the model ISO is standard creation committee or /organization By Abren Endeg Abren Endeg

6. ICT C o C OSI reference Model OSI is a network model developed to allow systems with different plate forms to communicate with each other ( plate forms , hardware /software/OS. OSI Defines a protocol for network communication. By Abren Endeg Abren Endeg

7. ICT C o C Layers of OSI Model 7. Application Layer 6. Presentation Layer 5 . Session Layer 4. Transport Layer 3. Network Layer 2. Datalink Layer 1. Physical Layer By Abren Endeg Sender Receiver Abren Endeg

8. ICT C o C Abren Endeg By Abren Endeg Sender Receiver

9. ICT C o C 7. Application Layer Enables the users and software to access a network. Provide email , remote login , file share and web browsing. Devices : Computers, Phones ,Gateways ,Servers… Protocols :- HTTP, FTP, SMTP… By Abren Endeg Abren Endeg

10. ICT C o C Abren Endeg 6. Presentation layer Defines data format. Translate incoming and outgoing data presentation. Data Compression. Encryption and decryption. Protocols :- ASCII , JPEG , MPEG . . . By Abren Endeg

11. ICT C o C 5. Session Layer Establishes the synchronization point. used incase of errors(Backup). Establishing session/ connection / between to users. Dialogue control to allow two system to enter into a dialogue( video conference/group chat ). Establish ,manage and terminate. Authentication and Authorization( Authentication verifies who the user is, what resources a user can access. ) Devices:- Gateway. Protocols :- NFS , SQL , PAP . . . By Abren Endeg Abren Endeg

12. ICT C o C 4. Transport layer Transmit data using transmission protocols. End-to-end or process to process delivery of the entire message. Deliver data in sequence with error free, no loses and duplication. Segmentation:- Break down large data unit received from session layer into multiple smaller units called segments. Re assembly :- reconstruct segmented data into a whole. Sequencing :- rearranging and ordering of data pieces to make a sense. Flow control:- equalize data flow rate. congestion control:- limit the terrific level Device :- Firewall. Protocols :- TCP , UDP , By Abren Endeg Abren Endeg

13. ICT C o C 3. Network Layer Decides which physical path the data will take. Source to destination delivery of packets. Logical addressing:- Assign 32 bit address called Ip addresses. Routing:- the process of determining the best path across multiple network segments and direct packets based on IP address. Fragmentation:- subdividing segments taken from transport layer into smaller packets. Device :- router Protocols :- IP, ARP, ICMP . . . By Abren Endeg Abren Endeg

14. ICT C o C 2. Datalink Layer   Provides for the flow of data. Detect and possibly correct errors that may occur in the   physical layer. Devices :- bridges , access point and switches . Protocols :- MAC addresses . . . By Abren Endeg Abren Endeg

15. ICT C o C 1. Physical layer   Transmit row bit over physical media. Devices:- repeaters, hubs, (NICs), cables and connectors .   Protocols :- DSL, USB, Ethernet , hub, NIC, Cables wireless( e.g , Bluetooth) . . . By Abren Endeg Abren Endeg

16. ICT C o C By Abren Endeg Layers of TCP/IP Model 4.Aplication layer 3. Transport layer 2. Internet Layer/Inter network 1. Network interface/access layer Abren Endeg

17. ICT C o C By Abren Endeg Abren Endeg

18. ICT C o C Abren Endeg Thank you By Abren Endeg