Ops 301: Class 01

This topic matters as it relates to what I'm studying in this module because

To start out, the OSI model stands for Open Systems Interconnection model, which is a conceptual framework that characterizes and standardizes the communication functions of a telecommunication or computing system. The model has seven layers, each with its unique function.

The seven layers of the OSI model are:

Physical layer - responsible for transmitting raw bit-streams over physical media

Data link layer - responsible for the reliable transfer of data across a physical link

Network layer - responsible for the transmission of data between nodes on a network

Transport layer - responsible for the reliable transfer of data between end-to-end connections

Session layer - responsible for managing and coordinating sessions between applications

Presentation layer - responsible for data representation and encryption

Application layer - responsible for providing network services to end-user applications

The physical and data link layers are considered the hardware layers because they deal with the physical components of the network, such as cables, routers, and switches. The remaining layers (network, transport, session, presentation, and application) are considered the software layers because they are responsible for software processes such as data routing, encryption, and application management.

Now, on to Wireshark. Wireshark is a popular network analysis tool used to capture and analyze network traffic in real-time. It allows users to monitor network activity at a microscopic level and troubleshoot network problems, such as identifying the root cause of slow network performance.

A packet is a unit of data that is transmitted over a network. It contains information such as the source and destination addresses, protocol used, and the data itself.

Wireshark accomplishes three high-level things:

Capturing network traffic: Wireshark can capture and display network packets in real-time, allowing users to monitor network activity and troubleshoot network problems.

Analyzing network traffic: Wireshark can dissect and decode packets, providing detailed information about the contents of each packet and the protocols used.

Filtering network traffic: Wireshark allows users to filter packets based on various criteria, such as protocol, source or destination address, or data pattern. This makes it easier to focus on specific traffic and analyze network problems more efficiently.

Things I want to know more about are why people would choose to use a different program than Wireshark and why. I would also like to be able to better read and understand the various graphs that are used to show and monitor some computer statistics, like the I/O Graph used in the statistics section of Wireshark. I would like to spend some extra time visiting the links at the bottom of the page as well to learn more.

References

Layers of OSI Model. (2022, June 15). Geeks for geeks. Retrieved March 13, 2023 from OSI Models

What Is Wireshark and How Is It Used? CompTIA. Retrieved March 13, 2023 from CompTIA Wireshark