说明： Cisco认证体系全面介绍,并包含：CCNA专业英文词汇全集，网络工程师专业术语大集合之路由器，路由简介等各种cisco相关资料 (Cisco introduced a comprehensive certification system, and includes: CCNA professional English vocabulary Works, network engineer large collection of professional terminology router, routing profile information such as cisco)
