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Updated: Aug 01, 2026
No. of Questions: 75 Questions & Answers with Testing Engine
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Cisco 642-655 Exam Overview:
| Certification Vendor: | Cisco |
| Exam Name: | Cisco Wide Area Application Services for Field Engineers |
| Exam Number: | 642-655 |
| Exam Format: | Multiple choice, Simulation-based questions (may be included) |
| Passing Score: | Variable (Cisco does not publish official passing score) |
| Exam Price: | $250 USD (approximate, subject to region and updates) |
| Related Certifications: | Cisco WAAS certification |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years (typical Cisco certification validity policy) |
| Real Exam Qty: | Approximately 45-55 |
| Recommended Training: | Cisco Learning Network - WAAS Resources Cisco Training and Certifications Portal |
| Exam Registration: | Pearson VUE Cisco Exams Cisco Certification Exam Registration |
| Sample Questions: | Cisco 642-655 Sample Questions |
| Exam Way: | Delivered via Pearson VUE test centers or online proctored exam |
| Pre Condition: | Recommended CCNA-level networking knowledge or equivalent experience with WAN technologies and Cisco infrastructure |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams.html |
Cisco 642-655 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Installation and Deployment | 20% | - Network integration and routing considerations - WAAS device installation and initial setup |
| Topic 2: Monitoring, Maintenance, and Troubleshooting | 20% | - Fault isolation and troubleshooting workflows - Performance monitoring tools and metrics - Log analysis and system diagnostics |
| Topic 3: Application Acceleration and Optimization | 25% | - Caching and data reduction techniques - Protocol optimization (TCP, CIFS, HTTP) - Application-specific optimization policies |
| Topic 4: Integration with Cisco Infrastructure | 10% | - Integration with Cisco routers and WAN edge devices - Policy coordination with enterprise network services |
| Topic 5: WAAS Architecture and Core Concepts | 25% | - WAAS system components and architecture overview - Deployment models (centralized and distributed) - Traffic optimization principles |
Cisco WAASFE-Wide Area Application Services for Field Engineers Sample Questions:
1. What are two ways firewalls can cause WAAS performance issues? (Choose two.)
A) Auto discovery uses the firewall scrub of the TCP options
B) Firewalls see that the TCP sequence number has shifted and drop the connection
C) Firewalls slow the traffic going through the WAAS devices
D) Only TFO will work through firewalls
2. In a Cisco WAAS deployment, what should you check first if your customer is reporting poor performance across all optimized applications?
A) Verify that only one Central Manager WAE is set to active
B) Verify that full duplex is configured on all interfaces
C) Verify that PBR has a route map for each direction of traffic flow
D) Verify that WCCP is configured with one service group in the path of each direction of traffic flow
3. How many baseline device groups can be configured for the acceleration feature set?
A) Three
B) One
C) Two
D) As many as needed
4. Your customer has configured each Cisco WAE to belong to multiple device groups for monitoring purposes. However the customer wants to ensure that the policies are applied to the device from one specific device group. What should you do?
A) You should configure the other device groups as monitoring-only
B) You must remove the WAE from all other device groups
C) You should configure an explicit policy device group
D) You should rejoin the WAE to the desired device group
5. Your customer is using firewalls. What must be permitted to pass through firewalls in order to allow WAE autodiscovery?
A) TCP port 139
B) TCP SYN-ACK with data
C) TCP options
D) TCP port 445
Solutions:
| Question # 1 Answer: A,B | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: C |
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