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Cisco 642-655 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Optimization Technologies and Configuration | 25% | - TCP optimization and flow control - Application-specific acceleration: HTTP, CIFS, SSL, Video - Policy creation and classification rules - DRE (Data Redundancy Elimination) and LZ compression |
| Topic 2: Monitoring, Reporting and Maintenance | 20% | - Software upgrades and backups - Central Manager monitoring dashboards - Logging, alerts and reporting - CLI commands for status and statistics |
| Topic 3: Cisco WAAS Architecture and Components | 20% | - WAAS solution overview and benefits - WAE, Central Manager, and WAAS Express components - Deployment models: In-path, WCCP, PBR, One-Arm, Two-Arm - Licensing and feature sets |
| Topic 4: Troubleshooting WAAS Deployments | 15% | - Optimization failures and performance problems - Redirection issues and verification - System errors and fault isolation - Connectivity and authentication issues |
| Topic 5: Installation and Initial Configuration | 20% | - Central Manager setup and device registration - Hardware and software installation - Redirection methods configuration - Basic network and interface configuration |
Cisco WAASFE-Wide Area Application Services for Field Engineers Sample Questions:
What is the function of Application Traffic Policies in a Cisco WAAS environment?
- A. To associate a flow with a WAE and associate the optimized flow with a device group
- B. To associate a flow with an optimization and associate the optimized flow with an application definition
- C. To associate a flow with a Central Manager and associate the optimized flow with an application definition
- D. To associate a flow with a WAN connection and associate the WAN connection with an application accelerator
Correct Answer: B 🗳️
The Cisco WAAS design for your customer calls for the Central Manager to be deployed on the Core WAE, which is a Cisco WAE-612 with 2-GB RAM. The customer initially configured the WAE as an application accelerator and then issued the device mode central-manger command to enable Central Manager Service. The customer reports that the WAE is no longer accelerating traffic. What is the problem?
- A. The device mode central-manager command must be issued before the device mode application-accelerator command
- B. At least 4 GB of RAM must be installed for the WAE to serve as both Central Manager and Application Accelerator
- C. Central Manager is consuming too much CPU time on the WAE. The Central Manager service should be implemented on a less-utilized edge-WAE
- D. Central Manager and Application Accelerator cannot be deployed on the same WAE
Correct Answer: D 🗳️
What important troubleshooting information can be gathered for the Video Accelerator from the WAE#show stat accelerator video?
- A. Troubleshooting of the Video Accelerator can only be done through the Central Manager GUI
- B. Whether or not the WAE(Config)#accelerator video enable command has been issued
- C. The total Non-Windows Media and Non-Live Video Streams
- D. The license status of the Video Accelerator
Correct Answer: C 🗳️
Which two symptoms would you expect to observe in a TCP trace if a Cisco WAE that was optimizing connections fails? (Choose two.)
- A. The receiving node receives TCP segments with invalid sequence numbers and resets the connection
- B. All optimized TCP connections handled by that WAE are reset
- C. All optimized TCP connections are taken over by the receiving node
- D. The secondary WAE takes over the connection and the receiving node sees nothing
Correct Answer: A,B 🗳️
Exhibit:
Your customer plans to deploy the edge WAE appliances in an off-path, two-arm configuration. The WAE appliances are connected to Cisco Catalyst 6500 Series Switches and use WCCPv2 for traffic interception. The customer wants to minimize the latency added by interception. The customer also wants to know if Layer 2 redirection, rather than GRE tunnels, will improve performance.
What should you tell your customer?
- A. Layer 2 redirection can be used only in one-arm configurations
- B. Layer 2 redirection can be used in the customer configurations
- C. Layer 2 redirection can be used only in in-path configurations
- D. GRE tunnels provide better performance than Layer 2 redirection
Correct Answer: B 🗳️
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