NetCLI: CCNA Network Simulator

NetCLI is a free, hands-on Cisco network simulator for CCNA on your phone. Build a network, type real Cisco IOS commands on routers and switches, and see the result in the topology. Practice subnetting, IPv6, Wi-Fi and troubleshooting anywhere.

Practice the same Cisco IOS commands you use in Packet Tracer – right on your phone, without a PC.

Made for students preparing for the CCNA 200-301 exam, networking classes and anyone who wants to understand how networks really work.

A NEW BROKEN NETWORK EVERY DAY

• Daily troubleshooting: every day someone calls with a network problem – a port that's down, a wrong mask, two PCs on one IP, Wi-Fi that won't connect. Find the fault in the IOS terminal and prove the fix with your own ping

• A different fault, network and caller every day – free for everyone

• Stamp your work orders through the week, and try a day again for a better stamp

BUILD AND CONFIGURE YOUR OWN NETWORK

• My Lab: add routers, switches and PCs, connect them and configure each device from its own terminal – with notes saved alongside each lab

• Cisco IOS command line: user, privileged and global configuration mode, show commands, ? help and IOS-style error messages

• PC command prompt that works like the one in Packet Tracer

• Ping and packet trace to test your network

• Wi-Fi: set up an access point with an SSID and a WPA2 key, then get a laptop online

• Starter topologies and guided exercises when you don't know where to begin

LEARN STEP BY STEP

• Guided lessons from networking basics to CCNA topics

• Readiness Check: 15 CCNA-style questions in 15 minutes to see where you stand

• Quiz: multiple-choice networking questions at different difficulty levels

SUBNETTING AND IP ADDRESSING

• Subnetting trainer with four difficulty levels: get a random IP and prefix, then find the network, broadcast, host range and usable hosts

• Subnet practice for IPv6, VLSM and CIDR

CISCO REFERENCE TOOLS

• Command library: search 200+ Cisco IOS commands for VLANs, OSPF routing, ACLs, DHCP, NAT/PAT, IPv6, SSH and diagnostics, and open a lab scenario to try them

• Config Explainer: paste a Cisco configuration and get a plain-English explanation of every line

• Packet Tracer guides: step-by-step walkthroughs for common lab scenarios

• Troubleshooting playbooks: work layer by layer through the OSI model with the right show commands

• Interactive OSI model and network map

KEEP YOUR PROGRESS

Create a free account to back up your progress and labs. Light and dark theme included.

Available in English and Spanish. Lessons and IOS commands stay in English, as on the CCNA exam.

Whether you're preparing for the CCNA exam, doing homework for a networking course or refreshing your Cisco skills, NetCLI gives you a hands-on network lab wherever you are.

NetCLI is an independent learning app. It is not affiliated with, sponsored or endorsed by Cisco Systems, Inc. Cisco, Cisco IOS, CCNA and Packet Tracer are trademarks of Cisco Systems, Inc.