🔀 Cisco
Hands-on Cisco tutorials — VLANs, SSH & Telnet, and Port Security with real Cisco IOS commands.
Step-by-Step: Backing Up and Restoring a Cisco Switch/Router Configuration
If a Cisco switch fails or gets reset, how do you get its configuration back? A complete guide to backing up and restoring config via TFTP and other methods.
6 min readStep-by-Step: Configuring Single-Area OSPF on a Cisco Router (CCNP Level)
Instead of manually defining every route, how do routers find the best path themselves? A complete guide to Single-Area OSPF with real Cisco IOS commands.
8 min readStep-by-Step: Configuring HSRP for Gateway Redundancy on Cisco (CCNP Level)
What happens if the router acting as the default gateway for an entire VLAN fails? A complete guide to HSRP for automatic gateway redundancy.
7 min readStep-by-Step: Configuring NAT on a Cisco Router
How do multiple computers with private IP addresses share a single public IP to reach the internet? A complete guide to PAT (NAT Overload) with real Cisco IOS commands.
7 min readStep-by-Step: Inter-VLAN Routing on Cisco (Router-on-a-Stick)
After creating VLANs, how do you let devices in two different VLANs talk to each other? A complete guide to Router-on-a-Stick with real Cisco IOS commands.
7 min readStep-by-Step: Understanding and Verifying Spanning Tree Protocol (STP) on a Cisco Switch
Why does a loop between switches paralyze an entire network, and how does STP prevent it? A complete guide to the STP concept and checking its status on Cisco.
6 min readStep-by-Step: Configuring EtherChannel (Link Aggregation) on a Cisco Switch
How do you combine multiple physical cables between two switches into one faster logical link? A complete guide to EtherChannel with real Cisco IOS commands.
6 min readStep-by-Step: Configuring Access Control Lists (ACL) on a Cisco Router/Switch
How do you specify that only one particular subnet is allowed to access a server? A complete guide to Standard ACL with real Cisco IOS commands.
7 min readStep-by-Step: Setting Up a VLAN on a Cisco Switch
How exactly do you segment a network with VLANs on a Cisco switch? A hands-on tutorial with real Cisco IOS commands.
6 min readStep-by-Step: Enabling SSH and Telnet on a Cisco Switch
Remote access to a Cisco switch, with secure SSH or plain Telnet — a complete guide with real Cisco IOS commands, and why SSH should always be your choice.
6 min readStep-by-Step: Configuring Port Security on a Cisco Switch
How do you stop an unknown device from being plugged into a switch port? A complete guide to Cisco Port Security with real IOS commands.
6 min read