Layer 6 - Presentation Layer
hahaaha
presentation layer
Data link Layer
Compression is the process of reducing the size of data by encoding it in a more efficient format, making it easier to store or transmit. This often involves removing redundancies or applying algorithms to minimize the amount of information needed to represent the original data. Decoding, on the other hand, is the process of converting compressed data back into its original format so that it can be understood or used. Essentially, compression is about minimizing data size, while decoding is about restoring it to its original state.
A PDU (Protocol Data Unit) is defined by which layer it is in. In the physical layer and network layer, it is synonymous with the packet, in the data link layer, it is the frame. In the transport layer, it is a datagram for UDP. A datagram holds one or more PDU's, as it is the basic unit of transferring information via packet switching.
presentation layer
Layer 2 - The Data Link Layer Layer 2 of the OSI model provides error-detection capability
A network consists of multiple computers communicating with one another over a shared network medium. Topology refers to the shape of a network, or the network's layout. In this unit, you have learnt about the various topologies and its structure. The OSI model is a seven-layer model for communications and computer network protocol design. In this unit, you have learnt about the OSI model and the functions of the various layers.
Data Link layer does the parity error checking Thanks, Samaresh
A program that performs a specialized task, such as a virus scanner, file compression program, or data backup program, is typically referred to as a "utility software." Utility software is designed to help manage, maintain, or protect computer resources and enhance system performance.
The presentation layer in the OSI model is responsible for translating, encrypting, and compressing data for the application layer. Key devices associated with this layer include gateways and protocol converters that facilitate communication between different data formats and protocols. Additionally, software applications that handle data formatting, such as video codecs and data compression tools, also operate at this layer, ensuring that data is presented in a usable form for users or applications.
Coding and conversion of Application layer data to ensure that data from the source device can be interpreted by the appropriate application on the destination device. Compression of the data in a manner that can be decompressed by the destination device. Encryption of the data for transmission and the decryption of data upon receipt by the destination.
network layer
The Presentation layer must make certain that the format of the data will be understandable by the Application layer. This includes the use of encryption, compression, different graphics formats, etc. It uses a technique known as Portable Data Representation that allows data from different hardware to be able to communicate.
The Presentation Layer of the OSI model handles the formatting of application data to ensure it is readable by the destination system. This layer is responsible for data translation, encryption, and compression, allowing different systems to understand the information being exchanged. It prepares data for the application layer and ensures that it adheres to the required formats for proper interpretation.
Data compression techniques are used to reduce the size of files and data for efficient storage and transmission. Common methods include lossless compression, which preserves all data accurately, and lossy compression, which sacrifices some data to achieve higher compression rates. Examples of compression algorithms include ZIP for general purpose compression, JPEG for image compression, and MP3 for audio compression.
Data Compression is a technique to minimize the space used by data in storing. So when we do compression of data, no data is loss.