IT4157 builds a foundational understanding of how computer networks actually interconnect, the components, media, and protocols supporting both local and wide area networks. Through guided modules and hands-on activities in Cisco Packet Tracer, students configure home and enterprise-level networks, applying communication standards and troubleshooting connectivity issues that mirror real network administration work.
Core networking concepts in IT4157
| Concept | What It Solves | Key Detail |
|---|---|---|
| IPv4 Addressing | Uniquely identifying devices on a network | 32-bit addresses, subnetting, and address exhaustion driving IPv6 adoption |
| IPv6 Addressing | Solving IPv4 address exhaustion at internet scale | 128-bit addresses providing vastly more available address space |
| DHCP | Automatically assigning IP addresses to devices joining a network | Eliminates manual address configuration on every device |
| Routing | Directing traffic between different networks | Routers use routing tables and protocols to determine the best path |
What IT4157 covers
The course opens with the fundamental building blocks of networks: the devices, cabling, and protocols that allow computers to communicate. Students study the OSI and TCP/IP models, frameworks that organize network communication into distinct layers, each responsible for a specific function. This layered understanding helps students troubleshoot problems systematically rather than guessing, since identifying which layer a problem occurs at narrows the diagnostic process significantly.
IT4157 then moves into practical addressing and routing: how IPv4 and IPv6 addressing schemes work, how DHCP automates address assignment, and how routers move traffic between networks using routing protocols. Students configure these elements hands-on in Cisco Packet Tracer, building both home and enterprise-scale network topologies. The course also covers wireless and mobile networking standards, since most modern networks combine wired and wireless infrastructure, and closes with structured troubleshooting methodology for diagnosing and resolving connectivity issues.
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Key topics in IT4157
- OSI and TCP/IP models: organizing network communication into distinct functional layers
- IPv4 addressing and subnetting: dividing networks into manageable, efficiently allocated segments
- IPv6 addressing: solving address exhaustion at internet scale with a vastly larger address space
- DHCP: automating IP address assignment for devices joining a network
- Routing fundamentals: how routers direct traffic between networks using routing tables and protocols
- Wireless and mobile networking standards and their integration with wired infrastructure
- Structured troubleshooting methodology for diagnosing and resolving connectivity issues
The TCP/IP model: four layers to know
- Application layer: where user-facing protocols operate, including HTTP, FTP, and DNS
- Transport layer: manages end-to-end communication, using TCP for reliable delivery or UDP for speed
- Internet layer: handles addressing and routing, primarily through IP (IPv4 and IPv6)
- Network access layer: manages the physical transmission of data over the network medium
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Network design projects, Packet Tracer configuration reports, and troubleshooting documentation. Networking architecture coursework done right.
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Frequently asked questions
Cisco Packet Tracer is a network simulation tool that lets students build and configure virtual network topologies without needing physical networking hardware. It allows hands-on practice configuring routers, switches, and end devices, then testing whether traffic flows correctly between them. Capella uses it because it closely mirrors real Cisco networking equipment commands and behavior, giving students transferable skills for actual network administration roles.
IPv4's 32-bit address space provides approximately 4.3 billion unique addresses, which has already been exhausted at the global allocation level due to the explosive growth of internet-connected devices. IPv6's 128-bit address space provides a vastly larger pool, effectively eliminating address exhaustion concerns for the foreseeable future. While many networks still rely on IPv4 through workarounds like NAT, IT4157 teaches IPv6 because long-term network design increasingly requires it, especially as IoT devices multiply network address demands.
Common assignments include designing and configuring a network topology in Packet Tracer for a specified scenario, a subnetting exercise dividing a given IP address range into appropriately sized segments, and a troubleshooting report diagnosing and resolving a simulated connectivity problem. Capella expects students to demonstrate both conceptual understanding and hands-on configuration competency.
The course requires IT2280 as a prerequisite, providing foundational networking concepts before students tackle the more advanced addressing, routing, and wireless topics in IT4157. Students who completed IT2280 successfully have the baseline knowledge needed, though IT4157 does build in complexity and hands-on configuration depth beyond what introductory coursework typically covers.