What specific topics are tested in CCNA 200-301 Network Fundamentals (20%)?

OSI model layers and their functions (e.g., Layer 2 switches vs. Layer 3 routers)

What else is tested in the Network Fundamentals (20%) domain?

TCP/IP model and its comparison to OSI (e.g., Application layer vs. Layer 7)

What else is tested in the Network Fundamentals (20%) domain?

IPv4 addressing and subnetting (e.g., calculating subnet masks and number of hosts)

What else is tested in the Network Fundamentals (20%) domain?

IPv6 addressing basics (e.g., link-local vs. global unicast addresses)

What are common mistakes on CCNA 200-301 Network Fundamentals (20%) questions?

Confusing the OSI and TCP/IP models: e.g., thinking the OSI Transport layer is the same as TCP/IP's Internet layer

What trap questions appear in the Network Fundamentals (20%) domain?

Miscalculating subnet ranges: e.g., forgetting to subtract the network and broadcast addresses

Courseiva

Knowledge + Practice

CCNA 200-301Exam Domain

Network Fundamentals (20%)CCNA 200-301 Study Guide

30 chapters

~750 min total

Free — no signup required

Quick Answer

Network Fundamentals covers the core concepts of how data travels across networks, including the OSI and TCP/IP models, IPv4/IPv6 addressing, subnetting, Ethernet, and basic routing and switching principles.

Network Fundamentals is the bedrock of the CCNA 200-301 exam, covering how data moves across networks. In plain English, this domain explains how devices like computers, routers, and switches communicate using protocols like TCP/IP and Ethernet. It's like learning the rules of the road for internet traffic—without it, no data gets where it needs to go. For real-world IT, security, and cloud work, understanding these basics is critical: when a cloud app is slow, you need to know if it's a routing issue, a DNS problem, or a bandwidth bottleneck. Security professionals rely on this knowledge to spot suspicious traffic patterns, and cloud engineers design virtual networks that mirror physical ones. On the exam, you'll be tested on your ability to describe the OSI and TCP/IP models, compare IPv4 and IPv6 addressing, explain subnetting, and identify common network topologies. You'll also need to know how switches forward frames and routers forward packets, and how ARP (Address Resolution Protocol) maps IP addresses to MAC addresses. To study this domain effectively, start by memorizing the OSI model layers and their functions—use mnemonics like 'Please Do Not Throw Sausage Pizza Away.' Then practice subnetting until you can do it in your sleep; use online calculators to check your work. Watch videos that show packet captures (like Wireshark) to see protocols in action. Finally, lab with Packet Tracer to configure a simple network—this hands-on practice will solidify concepts like default gateways and VLANs. Remember, Network Fundamentals isn't just theory; it's the foundation for everything else in networking.

What the exam tests

OSI model layers and their functions (e.g., Layer 2 switches vs. Layer 3 routers)
TCP/IP model and its comparison to OSI (e.g., Application layer vs. Layer 7)
IPv4 addressing and subnetting (e.g., calculating subnet masks and number of hosts)
IPv6 addressing basics (e.g., link-local vs. global unicast addresses)
Ethernet frame structure and MAC address learning (e.g., how switches build MAC tables)
ARP operation and its role in resolving IP to MAC addresses

Common exam traps

Confusing the OSI and TCP/IP models: e.g., thinking the OSI Transport layer is the same as TCP/IP's Internet layer
Miscalculating subnet ranges: e.g., forgetting to subtract the network and broadcast addresses
Assuming IPv6 doesn't need subnetting: e.g., not knowing how to calculate IPv6 subnet IDs

Network Fundamentals (20%) Chapters

The OSI Model

Objective 1.1 · CCNA 200-301 Objective 1.1

Network Fundamentals (20%) Chapters

Other CCNA 200-301 Domains

Test your Network Fundamentals (20%) knowledge