思科官方最新模拟器Packet Tracer 5.3 5.4 5.5 中文版安装版下载

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思科官方最新模拟器Packet Tracer 5.3   5.4 5.5 中文版安装版下载
支持VPN等部分安全试验！
支持3层交换 开始支持CCNP的BGP
可模拟思科路由器、交换机等设备CCNA阶段的全部实验

Cisco Networking Academy is pleased to announce the release of Cisco Packet Tracer version 5.3, a minor release that includes the following new protocol support and enhanced functionality:
更多新特性：
* Improved Linksys models, added WEP wireless security algorithm, Cable and DSL enhancements
* Call Manager Express (VOIP support)
* FTP server and routers/switches - server and client
* Email system (SMTP and POP3) - server and client
* Border Gateway Protocol (BGP) – limited implementation that allows for a more realistic representation of the Internet for scenarios
* Generic IP end devices – to create more versatility in device creation
* Activity Wizard Initial Tree enhancements – more scenario variations

The new protocol support and activity wizard enhancements in version 5.3 will enable instructors to teach concepts in CCNA Discovery, CCNA Exploration, and CCNP courses more effectively, including the following:
CCNA Discovery

* Networking for Home and Small Businesses: Improved Linksys models and wireless security protocols and algorithms, generic IP end devices
* Working at a Small-to-Medium Business or ISP: Better DNS, improved DHCP, wireless security, new FTP, SMTP, POP3
* Introducing Routing and Switching in the Enterprise: Improved multi-area OSPF, EIGRP, BGP
* Designing and Supporting Computer Networks: New VOIP, Call Manager Express

CCNA Exploration

* Network Fundamentals: Improved HTTP, DNS, DHCP; new FTP, SMTP, POP3
* Routing Protocols and Concepts: Improved multi-area OSPF, EIGRP, new BGP
* LAN Switching and Wireless: Improved Linksys m