Cisco
352-001 · Question #268
352-001 Question #268: Real Exam Question with Answer & Explanation
The correct answer is A: encryption. Encryption introduces the most delay among the listed options because cryptographic operations are computationally intensive even when hardware-assisted, making it most harmful to real-time voice quality.
Question
You are tasked with implementing a 1000-phone remote access solution, where phone calls will traverse a WAN edge router. Assuming all of the following features are supported in a hardware- assisted manner, which of the following will have the most negative impact on the delay of the packet?
Options
- Aencryption
- Bstateful firewall
- CMPLS encapsulation
- DGRE encapsulation
Explanation
Encryption introduces the most delay among the listed options because cryptographic operations are computationally intensive even when hardware-assisted, making it most harmful to real-time voice quality.
Common mistakes.
- B. A hardware-assisted stateful firewall performs fast connection-table lookups with minimal added latency, far less than the cryptographic rounds required by encryption.
- C. MPLS encapsulation consists only of pushing or swapping a small label header, an operation hardware performs in negligible time with no meaningful delay impact.
- D. GRE encapsulation prepends a fixed-size tunnel header to each packet, a simple operation that hardware executes with very low and predictable latency.
Concept tested. Encryption delay impact on VoIP quality of service
Reference. https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/14050-voip-encryptionqos.html
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