Understand the Network Topologies and the Network infrastructure.Know the Protocols and how they complement each otherDescribe the seven layers of the OSI modelMaster and analyse scenarios and refer the matching OSI layerIdentify types of applications and protocols used on a networkDistinguish between the client-server and peer-to-peer models used to control accessto a networkDescribe various networking hardware devices and the most common physicaltopologiesHOW Encapsulation/De-capsulation worksExplore best practices for safety when working with networks and computersDescribe the seven-step troubleshooting model for solving a networkingproblem

Network Topologies and Infrastructure: Network topologies refer to the arrangement of different elements (nodes, links, etc.) in a network. It can be linear, ring, star, mesh, tree, or hybrid. Network infrastructure refers to the hardware and software resources of an entire network that enable network connectivity, communication, operations and management of an enterprise network.

Protocols: Protocols are sets of rules that govern how data is transferred over a network. They define the format, timing, sequencing, and error checking used in data communication. Examples include HTTP, FTP, SMTP, and TCP/IP. These protocols complement each other by working together to ensure data is transferred accurately and efficiently.

OSI Model: The OSI (Open Systems Interconnection) model is a conceptual framework used to describe how different network protocols interact and work together to provide network services. The seven layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

Analyzing Scenarios: This involves understanding the situation, identifying the OSI layer that the issue pertains to, and applying the appropriate solution.

Applications and Protocols: Different applications use different protocols based on their requirements. For example, web browsers use HTTP or HTTPS, email uses SMTP, and file transfers use FTP.

Client-Server and Peer-to-Peer Models: In the client-server model, one or more computers (clients) are connected to a central computer (server) which controls the network resources. In the peer-to-peer model, all computers have equal status and can share resources without a central server.

Networking Hardware Devices: These include routers, switches, hubs, and bridges. Physical topologies refer to the physical layout of the network, such as star, ring, bus, or mesh.

Encapsulation/De-capsulation: Encapsulation is the process of adding headers and trailers to data. De-capsulation is the process of removing these headers and trailers at the receiving end.

Safety Practices: These include using antivirus software, setting strong passwords, regularly updating software, and following proper procedures when installing or modifying network equipment.

Seven-Step Troubleshooting Model: This model includes identifying the problem, establishing a theory of probable cause, testing the theory, establishing a plan of action, implementing the plan, verifying full system functionality, and documenting the process.