Your company has two offices. The network has Lync Server 2010 deployed. All users make PC -to-PC calls by using Microsoft Lync 2010. The estimated bandwidth for various codecs is shown in the following table.
Codec Bandwidth
G.711 59.8 Kbps
G.722 42.8 Kbps
Siren 22 Kbps
RTAudio wideband (16 kHz)34.8 Kbps
You need to calculate the minimum amount of bandwidth required to support 10 simultaneous PC-to-PC calls between the two offices. How much bandwidth is required?

A.
1196 Kbps

B.
220 Kbps

C.
856 Kbps

D.
696 Kbps

Explanation:
Peer-to-peer audio calls between Lync 2010 endpoints will use either RTAudio (8kHz) or RTAudio (16kHz) when you factor in the bandwidth and prioritization of codecs. (http://technet.microsoft.com/en-us/library/gg398334.aspx)
To support duplex calls, you have to double the bandwidth required for RTAudio protocol. In fact, tables in the article linked above give slightly different calculations, but for the exam these numbers are fine.