CCNA 200-301
Lab-tested Cisco IOS configuration for the CCNA 200-301 exam: device setup, CLI, SSH, and LAN services.
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Part 1 of 9
CCNA 200-301 Study Guide and Roadmap
The CCNA 200-301 is a single exam that certifies you can install, configure, and troubleshoot a small enterprise network, and this study guide breaks down exactly…
13 min read·Jun 2026
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Part 2 of 9
How to Subnet: A Step-by-Step Guide to Subnetting by Network Requirements
Most people who struggle with the CCNA do not freeze on OSPF or VLANs. They freeze on a subnetting question with the clock running, because subnetting…
8 min read·Jun 2026
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Part 3 of 9
VLSM Subnetting Explained: How to Subnet by Host Requirements
Carving a network into equal-size subnets wastes addresses. A point-to-point link with two routers does not need the same block you hand a 60-user LAN, yet…
5 min read·Jun 2026
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4
Part 4 of 9
Subnetting Cheat Sheet: IPv4 Masks, Hosts, and VLSM
Every IPv4 subnet mask, the usable host count it gives you, the wildcard mask, and the fastest way to work a subnet by hand. This subnetting…
5 min read·Jun 2026
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5
Part 5 of 9
Cisco IOS CLI Editing Commands and Navigation Shortcuts
Most of the time you spend on a Cisco router or switch is spent typing in the IOS command-line interface, and a handful of modes, shortcuts,…
6 min read·Jun 2026
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Part 6 of 9
Cisco Device Base Configuration: Hostname, SSH, and Secure Access
A factory-fresh Cisco router or switch trusts whoever reaches the console, answers to the generic name Router or Switch, and offers no way in over the…
11 min read·Jun 2026
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Part 7 of 9
Configure HSRP on Cisco Routers
When the default gateway on a subnet dies, every host on it loses the path off the LAN until someone swaps hardware or reconfigures. HSRP removes…
6 min read·Jun 2026
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Part 8 of 9
Configure DNS on Cisco Routers
DNS turns names into addresses, so you can reach server1.lab.example.com without memorizing 10.0.0.1. A Cisco router handles names three ways: it can keep its own static…
5 min read·Jun 2026
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9
Part 9 of 9
Configure SSH on Cisco Routers and Switches
Telnet sends your username and enable password across the wire in cleartext. SSH does not, and on a Cisco router or switch it takes a short,…
7 min read·Jun 2026