What is an Essay?
Presentation layer[ change change source ] To be able to properly interpret a message send through the network this layer is responsible for the proper translation or interpretation. When needed a session is started with authentication, after which a request is sent.
After a response the session might be ended or a new request is sent. Were a specific device might change the role from client to server or vice versa. Transport layer[ change change source ] The Transport Layer is the level at which system reliability and quality are ensured.
This layer manages traffic flow through the network layer to reduce congestion on a network, and performs error checking ensuring quality of service by resending data when data has been corrupted. Some of the most popular methods of encryption and firewall security take place on this layer.
Network layer[ change change source ] The Routing Layer works to coordinate related parts of a data conversation to ensure that large files are transferred. In other words, while the data link layer deals with the method in which the physical layer is used to transfer data, the network layer deals with organizing that data for transfer and reassembly.
This layer also handles aspects of Routing Protocols, finding the available [best] path s from one network to another to ensure delivery of the data. Data link layer[ change change source ] The Data Layer is mainly the method in which information from the network is broken down into frames and transmitted over the physical layer.
This layer is also responsible for some Error detection and correction and some addressing so different devices can tell each other apart in larger systems. Physical layer[ change change source ] The physical layer refers to electrical and physical aspects of devices.
In particular, it specifies how a device sends and receives information, such as using copper wires or fiber-optic cables. Examples of this include Ethernet or fiber optic cables, phone cords used for dial-up or DSL services, the coaxial cable used to provide broadband internet, the wires used to connect various components of a computer or even the radio signals used in wireless communication.
Other functions of the physical layer include the conversion of signals into something that another layer can use referred to as a bitand adjusting the signal to allow for multiple users to use the same connecti.The OSI model, however, is a proven concept that is used in all other data communications protocols.
It will continue to be used as a guideline for all other communications applications. References. Security expert Michael Gregg continues his layer-by-layer discussion of OSI model network security with this tip on the vulnerabilities present in Layer 2, the Data Link Layer, and specifically addresses the Address Resolution Protocol.
© Cisco Systems, Inc. All rights reserved. SMBUF-1 SMB University: Selling Cisco SMB Foundation Solutions Networking Fundamentals. Even if you're unfamiliar with networking, you've probably heard of the Open Systems Interconnection (OSI) model.
Each of the seven OSI model layers depicts a different function in software or a.
Cryptographic Tunneling and the OSI Model. Write a paper consisting of , words (double-spaced) on the security effects of cryptographic tunneling based on an understanding of the OSI (Open Systems Interconnect) model (Review the OSI Simulation in the Week 3 Lecture).
Security in the OSI Model Thierry BUFFENOIR Sagem, Peripheral Equipments, Pontoise R&D Plant, Chauss~e Jules COsar, F Osny, France The purpose of this paper is to review the state of the art of standardization in the field of security, and to present a security architecture within the Open Systems Interconnection Reference Model.