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Cisco 642-821 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| VPN and Advanced Remote Access | 15% | - IPsec VPN fundamentals - Scaling and securing remote access networks - QoS for remote access links - Configuring site-to-site IPsec VPNs |
| ISDN and DDR Connectivity | 25% | - ISDN troubleshooting - Configuring and verifying ISDN BRI/PRI - Dial-on-Demand Routing (DDR) concepts - ISDN BRI and PRI components and operation - ISDN call control and bandwidth management |
| Frame Relay Connectivity | 20% | - Subinterfaces and bandwidth control - Frame Relay concepts and terminology - Configuring Frame Relay encapsulation and mapping - Frame Relay traffic shaping and troubleshooting |
| Remote Access Overview and Asynchronous Connections | 20% | - Modem autoconfiguration and troubleshooting - Modem standards and cabling - Configuring asynchronous lines and modems - Remote access technologies and requirements |
| PPP and Access Control | 20% | - Multilink PPP and compression - AAA framework, TACACS+ and RADIUS - PAP and CHAP authentication - PPP protocol features and negotiation |
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