C172 is Western Governors University's foundation course in networking and security, listed in IT programs including IT Management.
WGU's course description says it introduces the components of a computer network and the concept and role of communication protocols. It covers categories of network such as LAN, MAN, WAN, WLAN, PAN, SAN, CAN and VPN, along with topologies, physical devices and layered abstraction.
It also introduces basic security: network vulnerabilities and mitigation techniques, physical media security, and security policies and procedures.
The challenge is vocabulary. Dozens of acronyms arrive at once, and they only stick when you understand how the pieces fit together.
Course at a Glance
| Item | Details |
|---|---|
| University | Western Governors University (WGU) |
| Course code | C172 |
| Level | Undergraduate |
| Format | Competency-based, self-paced |
| Subject area | Networking and security foundations |
| Assessment | Check your course page for the current assessment type |
What C172 Covers
| Area | Key ideas |
|---|---|
| Network categories | LAN, MAN, WAN, WLAN, PAN, SAN, CAN, VPN |
| Topologies | Star, bus, ring, mesh and hybrid layouts |
| Devices | Switches, routers, access points, firewalls |
| Layered abstraction | The OSI and TCP/IP models and where protocols sit |
| Security basics | Vulnerabilities, mitigation, physical media security, policies |
Key Concepts Explained
The OSI Model
The OSI model splits network communication into seven layers. Each layer serves the one above it, which lets engineers troubleshoot one layer at a time.
| Layer | Example |
|---|---|
| 7 Application | HTTP, DNS |
| 6 Presentation | Encryption, data formats |
| 5 Session | Setting up and ending sessions |
| 4 Transport | TCP, UDP |
| 3 Network | IP addressing, routers |
| 2 Data link | MAC addresses, switches |
| 1 Physical | Cables, radio signals |
Switches and Routers
A switch connects devices within a local network using MAC addresses. A router connects different networks and forwards traffic using IP addresses.
Example: In a small office, laptops and printers connect to a switch, so a laptop can print without leaving the LAN. When someone opens a website, traffic goes from the switch to the router, which forwards it to the internet provider and on to the web server.
Vulnerabilities and Mitigation
Security matches each weakness with a control. Defense in depth layers several controls, so one failure does not expose everything.
Example: A café's open Wi-Fi lets anyone see unencrypted traffic. Mitigations include WPA3 encryption, a separate guest network isolated from the till system, and a firewall rule blocking guest access to internal devices. A policy requiring regular password changes for staff accounts adds another layer.
Security Policies and Physical Security
Technical controls fail without clear rules. Security policies set expectations such as acceptable use, password standards and incident reporting, and procedures explain exactly how staff follow them.
Physical security matters too: locking network cabinets, protecting cables from tampering and controlling who enters server rooms. Many breaches start with simple physical access, so this part of the course is worth more attention than it usually gets.
Typical Tasks and How to Approach Them
| Task type | What it tests | How to approach it |
|---|---|---|
| Classify a network | Network categories | Consider scale, ownership and connection method |
| Match protocol to layer | Layered models | Ask what job the protocol does |
| Identify a vulnerability | Security basics | Name the weakness and a matching control |
| Recommend a topology | Design thinking | Weigh cost, reliability and ease of expansion |
IP Addresses in Brief
Every device on an IP network needs an address. IPv4 addresses are written as four numbers from 0 to 255, such as 192.168.1.20, while IPv6 uses much longer hexadecimal addresses to provide far more of them.
Private address ranges, such as 192.168.x.x, are used inside homes and offices. A router uses network address translation (NAT) to let many private devices share one public address on the internet.
Example: A laptop at 192.168.1.20 and a phone at 192.168.1.21 both browse the web through a home router. Websites see only the router's public address; the router keeps track of which reply belongs to which device.
Where Students Get Stuck
- Acronym overload. Group terms by layer or purpose rather than learning them alphabetically.
- Switch versus router. Remember: switches within a network, routers between networks.
- TCP versus UDP. TCP is reliable and ordered; UDP is faster with no delivery guarantee.
- Security as technology only. Policies and physical security are part of the course too.
Study Tips for C172
- Draw your home network and label every device and the layer it works at.
- Use a mnemonic for the OSI layers, then practice placing protocols.
- Make a two-column table of vulnerabilities and mitigations.
- Take practice questions often and review every wrong answer.
How We Help with C172
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Frequently Asked Questions
WGU describes network components and protocols, network categories, topologies, devices and layered models, plus basic security: vulnerabilities, mitigation, physical media security and security policies.
Check your WGU course page for the current assessment.
No. It is a foundations course, though practice with real devices or simulators helps.
A LAN covers a small area such as an office; a WAN links networks across large distances.
Check your course materials. Knowing common ones, such as 80 for HTTP and 443 for HTTPS, is useful.
No. We never take exams or access student accounts. We offer tutoring and explanations.