CompTIA Network+ What is A model | OSI Model Vs. TCP/IP Model | Introduction to Network
Course Descripition
An internationally recognized credential is the CompTIA Network+ Certification. The expertise of networking specialists is validated by this qualification. The certification acknowledges the candidate's capacity to define the characteristics and operations of the network and its constituent parts. We will learn how to manage, maintain, troubleshoot, install, run, and configure fundamental network infrastructure in this course. This course is made to help people develop their networking abilities as well as get ready for the Network+ certification exam, which can lead to more job prospects from various businesses.
Introduction to Network
A network, in the context of information technology, refers to a collection of interconnected devices or systems that can communicate and share resources with each other. These devices can be computers, servers, routers, switches, or any other hardware or software components that enable communication and data exchange.
The purpose of a network is to facilitate the sharing of information, resources, and services among the connected devices. Networks can be local, covering a small area such as a home or office, or they can span across wide geographical areas, such as the internet. Networks can also be classified based on their structure, such as client-server networks or peer-to-peer networks.
What is A model
In CompTIA Network+, the term "model" typically refers to various network models that are used to describe and understand different aspects of computer networks. These models provide a conceptual framework for designing, implementing, and troubleshooting networks. The two most commonly referenced models in CompTIA Network+ are the OSI (Open Systems Interconnection) model and the TCP/IP model.
- OSI Model: The OSI model is a conceptual framework that defines how different network protocols interact and communicate with each other. It consists of seven layers, each with a specific set of functions and responsibilities.
- TCP/IP Model: The TCP/IP (Transmission Control Protocol/Internet Protocol) model is another widely used networking model. It is a four-layered model that describes the protocols and services used in the Internet. The layers, from bottom to top, are: Network Interface, Internet, Transport, and Application. The TCP/IP model is often used to understand and troubleshoot network connectivity issues in modern networks
OSI Model Vs. TCP/IP Model
In CompTIA Network+, the OSI (Open Systems Interconnection) model and the TCP/IP model are both covered as fundamental networking models. While the OSI model is a conceptual framework that describes how different network protocols interact and communicate, the TCP/IP model is a specific implementation of a network protocol suite commonly used in the Internet.
Here's a comparison of the two models:
OSI Model:
The OSI model is a theoretical framework consisting of seven layers, each representing a specific function or task in a network communication
- Application: Provides network services to applications and end-users.
- Presentation: Handles data translation and encryption/decryption.
- Session: Establishes and manages connections between applications.
- Transport: Provides reliable or unreliable delivery of data between hosts.
- Network: Routes packets across different networks.
- Data Link: Manages data frames at the local network level.
- Physical: Deals with the physical transmission of data over the network medium.
TCP/IP Model:
The TCP/IP model is a four-layered model that closely aligns with the actual implementation of the TCP/IP protocol suite. The layers, from top to bottom, are as follows:
- Application: Corresponds to the application, presentation, and session layers of the OSI model.
- Transport: Equivalent to the transport layer of the OSI model. It ensures reliable delivery of data through protocols like TCP and UDP.
- Internet: Similar to the network layer of the OSI model. It deals with IP addressing and routing of packets.
- Network Interface: Combines aspects of the data link and physical layers of the OSI model. It handles the physical transmission and link-layer protocols.
Key Differences:
- Layering: The OSI model has seven layers, while the TCP/IP model has four layers.
- Specific Protocols: The OSI model does not specify any particular protocols, whereas the TCP/IP model defines specific protocols like TCP, UDP, IP, ICMP, etc.
- Implementation: The OSI model is a conceptual model, while the TCP/IP model is a practical implementation used in the Internet and most modern networks.
- Popularity: The TCP/IP model is widely adopted and used, while the OSI model is mainly used for reference and teaching purposes.