#OSI model

[ripfunkyboy]

Dante's Inferno but it's the 7 layers of the OSI model

[epsilonplus]

somehow I never posted this but have this incredible image I made a few years ago

[infosectrain03]

The Data Link Layer is the second layer of the Open Systems Interconnection (OSI) model, which serves as a conceptual framework that standardizes communication system functions. This layer focuses on the reliable transfer of data between adjacent network nodes over a physical link.

[techgabbing]

Explore the Seven Layers of Connectivity in the OSI Model

Unlock the mysteries of the OSI Model! Beginner-friendly guide to understand the layers and functions. Dive into networking fundamentals effortlessly.

[sugoiney-weaver]

Every friend group needs a Router. Someone who can go Layer 3 and talk to other groups. A diplomat. An envoy. A bard.

[stickytyphoonbouquet]

Basic Networking Part 6

Basic Networking Part 6 – What is OSI Model?

Introduction

The Open Systems Interconnection Model (OSI Model) is a theoretical framework for describing the functions of a networking system. In order to facilitate interoperability between diverse devices and applications, the OSI model describes computing functions into a universal set of rules and standards. The connections between computing systems are divided into seven abstraction levels in the OSI reference model: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

The OSI was published in 1984 by the International Organization for Standardization at a period when network computing was still in its infancy (ISO). The OSI Model is still used to explain network architecture today, even if it does not always map exactly to real systems.

The 7 Layers of the OSI ModelPhysical Layer

The OSI Model’s lowest layer is concerned with electrically or optically passing raw unstructured data bits over the network from the sending device’s physical layer to the receiving device’s physical layer. Voltages, pin arrangement, cabling, and radio frequencies are examples of specifications. Network hubs, cabling, repeaters, network adapters, and modems are examples of “physical” resources found at the physical layer.

Data Link Layer

Directly connected nodes are utilized at the data connection layer to perform node-to-node data transfer, in which data is bundled into frames. Errors that may have happened at the physical layer are also corrected by the data link layer.

Network Layer

Receiving frames from the data link layer and delivering them to their intended destinations based on the addresses contained within the frame is the responsibility of the network layer. Logic addresses, such as IP addresses, are used by the network layer to locate the destination (internet protocol). Routers are a critical component at this tier, as they literally route data where it needs to go between networks.

Transport Layer

The transport layer is in charge of data packet delivery and error checking. It controls the size, sequencing, and, ultimately, data transit between systems and hosts. TCP, or Transmission Control Protocol, is one of the most frequent transport layer instances.

Session

Layer

The session layer is in charge of coordinating conversations between computers. At layer 5, a session or connection between machines is established, managed, and terminated. Authentication and re-connections are also part of the session layer services.

Presentation Layer

Based on the syntax or semantics that the application accepts, the presentation layer formats or converts data for the application layer. As a result, it’s sometimes referred to as the syntactic layer. This layer can also handle the application layer’s encryption and decryption needs.

Application Layer

Both the end user and the application layer interact with the software application directly at this tier. End-user programmers, such as a web browser or Office 365, receive network services through this layer. The application layer locates communication partners, determines resource availability, and coordinates communication.

Conclusion

The theoretical OSI Model is used, on a daily basis, throughout the industry as it is an essential building block for when it comes to creating and troubleshooting applications and infrastructures. Follow the data down the layer to see how it’s transported and handled by systems and networks.

[certexamscom]

OSI model Application Layer of the opensystems model explained in this video.

[kbrosis]

7 Layer of the OSI Model

As we all aware for computer networks works that we need laptop, LANs, Router, switch, Internet, and routing protocols, but how all these parameters are interconnected with each other? We always heard that Switch works at Layer-2 and Router works on Layer-3, but what all these layers? In this Blog, we will discuss and understand this. Computer Network: 7 Layer of the OSI Model What is the OSI…

[minhphong306]

Tìm hiểu mô hình OSI cùng Hằng béo

— Hằng này, anh đố mày, mô hình OSI là gì? — Em nhớ mang máng nó là mô hình bảy tầng gì đó… Mà học cái này có bao giờ dùng đến đâu, nên em chả nhớ được. — Uh, khi mới làm thì có thể em chưa dùng thật, nhưng khi làm lên cao hơn thì em có thể phải dùng tới nó đó. — Thôi thôi, anh đừng có mà mồm điêu. Đi làm mấy năm có bao giờ em dùng đâu? Kể ra ứng dụng xem nào? Continue reading Untitled

[noob2networking]

Server Saturday: Understanding ARP - How Devices Communicate on a Local Network

If you’ve ever wondered how devices communicate on a local network, ARP is the answer. ARP, or Address Resolution Protocol, is a key component of networking that allows devices to communicate with each other using unique MAC addresses. In this post, we’ll dive into the details of ARP, how it works, and how it helps to facilitate communication between devices on a local network. We’ll also cover…

[infosectrain03]

The OSI model provides a standardized framework for the interaction and communication between various networking protocols and technologies within a network. It breaks down the communication process into seven distinct layers, each with specific responsibilities, and ensures that data communication between devices is seamless and uniform. One significant layer in the OSI model is the Presentation Layer.

[ai-azura]

The Role of Load Balancers in Ensuring Network Availability and Fault Tolerance

The Role of Load Balancers in Ensuring Network Availability and Fault Tolerance

Load balancers play a crucial role in ensuring the availability and fault tolerance of a network. They are designed to distribute incoming traffic across multiple servers, thereby improving the reliability and performance of a network. One of the primary benefits of using load balancers is that they can help to prevent single points of failure. In a network without load balancing, all traffic is…

[hug-your-face]

The Next Web Needs To Be A Forest

Been mourning the '90s and '00's internet for a while. Been hating the enshittified, platform-capitalistic internet dystopia.

Been saying for a while that the next internet must get away from centralized control, and be founded on distribution and federation.

There is no single monolithic "TCP/IP server farm" run by one company with one mentally-diseased white man at the helm. This is why internet traffic can get more or less anywhere. But there ARE monolithic social media sites (Twitter/X, FB). And there is monolithic identity management ("log in to BuyJunk with your Google account"). Even Discord where anyone can make their own "server" is hosted and runs on Discord-proprietary software and hardware.

The next internet -- if it's to be any good and not just further enshittification -- is going to be less like the hub-and-spoke system of airports, and more like a forest where trees and clusters of trees interconnect with each other organically.

Group chats, where some members of the group chat are members of multiple group chats.

But the only way that internet is going to happen is if people -- not corporations -- make it. There's no profit in a distributed internet. It's going to have to happen for the same reason that people throw parties, or stage demonstrations, or just get together regularly to go climb rocks.

It's going to have to happen out of love.

And that means that the gap between WANTING to build this new net and BEING ABLE to build this new net needs to get a lot smaller.

Keep an eye out for technologies, organizations, and education that narrows the gap. Help them.

And beware legislation and corporations that want to put barriers in the way. Fight them.

[1o1percentmilk]

guess who's paying for not paying attention to the networks unit in systems programming last spring