Cisco
352-001 · Question #688
352-001 Question #688: Real Exam Question with Answer & Explanation
The correct answer is A: jitter. VoIP over a WAN requires careful management of jitter and available bandwidth to maintain acceptable voice quality across the MPLS network.
Question
A retail company has 250 branches connected to the core via MPLS Layer 3 VPN. The company is migrating from traditional telephony services to a VoIP solution. Which two primary concerns when implementing a VoIP solution are true? (Choose two.)
Options
- Ajitter
- Bavailable bandwidth
- Ccall routing design
- Dcall routing design
- EMTU
- FSRST
Explanation
VoIP over a WAN requires careful management of jitter and available bandwidth to maintain acceptable voice quality across the MPLS network.
Common mistakes.
- C. Call routing design is an application-layer telephony concern related to dial plans and call admission control, not a primary network transport quality parameter for VoIP.
- D. Call routing design is a duplicate of choice C and is an application-layer telephony concern, not a primary network transport quality parameter for VoIP.
- E. MTU size can cause fragmentation overhead but is a secondary, easily addressed concern through interface configuration and does not continuously impact call quality the way jitter and bandwidth do.
- F. SRST (Survivable Remote Site Telephony) is a Cisco failover feature providing local call processing when WAN connectivity is lost, not a primary network transport quality concern for active VoIP traffic.
Concept tested. VoIP QoS primary network transport requirements
Reference. https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/14081-voip-qos.html
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