GNS3 是一个优秀的开源软件，对网络工程师、管理员和想要通过CCNA, CCNP, CCIP, CCIE, JNCIA, JNCIS, JNCIE.认证的人们来说，是一个很好的实际网络实验的辅助工具，可以使用IOS、JUNOS等真实的操作系统仿真路由器操作。-GNS3 is an excellent complementary tool to real labs for network engineers, administrators and people wanting to pass c

trafic engireening gns lab

asa802-k8-sing.gz 用GNS3模拟器打开，能模拟防火墙放一些实验(Asa802-k8-sing.gz opens with GNS3 simulator and simulates some experiments of firewall)

gns3 1.46能模拟真实网络设备环境，可实验大多数环境拓扑，实验配置。(GNS3 1.46 can simulate the real network device environment, can experiment most of the environmental topology, experimental configuration.)