Assume 6 bytes for the Layer 2 header, 1 byte for the end-of-frame flag, and a 40-millisecond voice
payload, how much bandwidth should be allocated to the strict priority queue for five VoIP calls that
use a G.729 codec over a multilink PPP link?

A.
87 kb/s

B.
134 kb/s

C.
102.6 kb/s

D.
77.6 kb/s

E.
71.3 kb/s

Explanation:
Voice payloads are encapsulated by RTP, then by UDP, then by IP. A Layer 2 header of the correct
format is applied; the type obviously depends on the link technology in use by each router interface:
A single voice call generates two one-way RTP/UDP/IP packet streams. UDP provides multiplexing
and checksum capability; RTP provides payload identification, timestamps, and sequence
numbering.