300-070 · Question #3
Which two codecs are the best codecs to use in WAN and LAN? (Choose two.)
The correct answer is C. WAN codec G.729 D. LAN codec G.711. Codec selection depends on available bandwidth. G.729 (answer C) is the best choice for WAN links because it uses compression to reduce bandwidth consumption to approximately 8 kbps per call, conserving the limited and often costly bandwidth typical of WAN connections. G.711 (ans
Question
Which two codecs are the best codecs to use in WAN and LAN? (Choose two.)
Options
- AWAN codec G.711
- BLAN codec G.729
- CWAN codec G.729
- DLAN codec G.711
How the community answered
(37 responses)- A5% (2)
- B3% (1)
- C92% (34)
Explanation
Codec selection depends on available bandwidth. G.729 (answer C) is the best choice for WAN links because it uses compression to reduce bandwidth consumption to approximately 8 kbps per call, conserving the limited and often costly bandwidth typical of WAN connections. G.711 (answer D) is the best choice for LAN environments because LANs have abundant bandwidth (100 Mbps or more), so there is no need for compression. G.711 provides higher audio quality at 64 kbps without the processing overhead and potential quality loss introduced by compression. Using G.729 on a LAN would waste CPU resources unnecessarily, and using G.711 on a WAN would consume too much bandwidth per call.
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