300-070 Question #3: Real Exam Question with Answer & Explanation

The correct answer is C: WAN codec G.729. 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

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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