Every networked application — email, web browsing, video calls — depends on layers of networking protocols working together reliably. IT2280 teaches the models and technologies that make that reliability possible.
The OSI and TCP/IP models
IT2280 covers the seven-layer OSI model and the more practically-used four-layer TCP/IP model, teaching students to understand networking as a layered system where each layer handles a specific responsibility (physical transmission, addressing, routing, application-level communication) independently of the others, which is what allows networking technology to evolve and interoperate across vendors.
Network topologies, routing, and switching
The course covers common network topologies (star, mesh, bus), the difference between routing (moving data between different networks) and switching (moving data within a single network), and basic network architecture design decisions — like segmenting a network for security or performance reasons using VLANs.
Key topics in IT2280
- The OSI seven-layer model and the TCP/IP four-layer model
- IP addressing and subnetting fundamentals
- Network topologies: star, mesh, bus, and hybrid designs
- Routing vs. switching: moving data between vs. within networks
- VLANs and network segmentation for security and performance
- Common networking protocols: TCP, UDP, DNS, DHCP
Working on a network architecture design project or an OSI model analysis?
Our IT experts build IT2280-level coursework with accurate networking fundamentals.
Worked example: tracing data through the OSI model layers
- Application layer: A user sends an email — the email application formats the message
- Transport layer: TCP breaks the message into segments and ensures reliable delivery
- Network layer: IP addresses the segments for routing across networks
- Data link layer: Frames are prepared for transmission on the local network segment
- Physical layer: Bits are transmitted as electrical, optical, or radio signals
- Lesson: Each layer handles its specific job independently, which is why different vendors' networking hardware can interoperate as long as they follow the same layered standards
Get Help With IT2280
Network architecture and OSI/TCP-IP model assignments.
Place Your OrderView All ServicesRelated courses
Frequently asked questions
A layered model divides the complex problem of network communication into independent, manageable pieces, where each layer handles one specific responsibility and interacts with the layers directly above and below it through standardized interfaces, without needing to know the internal details of how other layers work. IT2280 teaches this layered approach because it's what allows networking technology to evolve and interoperate across different vendors and generations of technology — a network engineer can upgrade the physical layer's cabling technology (say, from copper to fiber optic) without needing to redesign how the transport or application layers function, and equipment from completely different manufacturers can communicate successfully as long as they all correctly implement the same standardized layer interfaces. Without this layered separation, any change to one part of networking technology would potentially require redesigning the entire system, making networking technology far less flexible and interoperable than it actually is.
Switching operates within a single network (typically a local area network), using a switch to forward data frames between devices based on their physical (MAC) addresses — essentially directing traffic among devices that are all part of the same local network segment. Routing operates between different networks, using a router to forward data packets based on logical (IP) addresses, determining the best path for data to travel from a device on one network to a device on an entirely different network (like sending data from a home network out across the internet to a remote server). IT2280 teaches this distinction because switches and routers serve genuinely different, complementary roles in getting data from its source to its destination — a switch handles the "last mile" of moving data to the correct device within a local network, while a router handles the broader job of finding a path between different networks entirely, and most real-world data transmission (like loading a website) relies on both switching and routing working together in sequence.