Refer to the exhibit. An engineer is upgrading existing frame-relay network to MPLS using Ethernet. The amount of bandwidth from service provider will remain the same. What two issues the engineer must consider when changing from frame-relay to Ethernet for voice connectivity? (Choose two)
A. Overhead with Ethernet L2 is much smaller than Frame-Relay L2 headers
B. Using G711 codec, calls will consume slightly more bandwidth over Ethernet than frame-relay calls
C. Ability to use header compression will not be available when using ethernet
D. Using G711 codec, calls will consume slightly less bandwidth over Ethernet than frame-relay calls
E. Ethernet and MPLS will allow engineer to implement QoS which is not available on frame relay
B, C
RFC 4247 = Therefore, the proposal is to use existing HC techniques, together
with MPLS labels, to make the transport of the RTP/UDP/IP headers
more efficient over an MPLS network. However, at this time, there
are no standards for HC over MPLS, and vendors have not implemented
such techniques. (2005)
C is and advantage but not a must consdieration: Frame Relay has no quality of service (QoS) manageability and is largely being replaced by the more cost effective MPLS VPN Solutions.