An emulator dedicated to emulate some Cisco hardware. However, there is now a way to obtain the latest Cisco ASA & ASDM images without an entitlement or service contract. Back in the days before they updated their site, you use to be able to download their firmwares as long as you had a valid CCO account. IOU allows you to build out a network topology on a single PC without the need for physical routers. GNS3 offers multiple ways to emulate IOS. The Cisco website does not permit you to download ASA & ASDM images without a proper entitlement. IOU supports all Cisco IOS platform independent protocols and features.
I also show you how to add Docker containers to your network. Cisco-IOU-L2-元-Collection-v4.7z Cisco IOS-On-UNIX is a fully working version of Cisco IOS that runs as a user mode Linux process. Although nothing beats practicing on original equipment but if anything stands close to original gear, that is GNS3. If you can’t buy original routers and switches, GNS3 is your rescue. How do you build Cisco networks in GNS3? In this video I show you how to download Cisco IOS images (Cisco VIRL images) to run IOSv and IOSvL2 in your GNS3 topologies. Its always better to use latest IOS versions, as they provide full command support.