Description:

GNS3 is an excellent complementary tool to real labs for network engineers,
administrators and people wanting to study for certifications such as Cisco
CCNA, CCNP, CCIP and CCIE as well as Juniper JNCIA, JNCIS and JNCIE.

It can also be used to experiment with features of Cisco IOS, Juniper JunOS or
to check configurations that need to be deployed later on real routers.

Thanks to VirtualBox integration, now even system engineers and administrators
can take advantage of GNS3 to study Redhat (RHCE, RHCT), Microsoft (MSCE,
MSCA), Novell (CLP) and many other vendor certifications.