思科CCNP安全认证642系列官方指南 英文pdf文字版

思科CCNP安全认证642系列官方指南英文版，包括642-617,642-637,642-647
The official study guide helps you master all the topics on the CCNP Security SECURE exam, including:

Network security threats and foundation protection
Switched data plane security
802.1X and identity-based networking services
Cisco IOS routed data plane security
Cisco IOS control plane security
Cisco IOS management plane security
NAT
Zone-based firewalls
IOS intrusion prevention system
Cisco IOS site-to-site security solutions
IPsec VPNs, dynamic multipoint VPNs, and GET VPNs
SSL VPNs and EZVPN

一共四本，617和627将在年底发布后更新。