Question
In regard to a hub and spoke Frame-Relay data network, what kind of physical
network is it classified as?


A. point-to-point


B. broadcast multi-access


C. nonbroadcast multipoint


D. nonbroadcast multi-access


E. broadcast point-to-multipoint
Answers
D
Explanation:
Frame relay networks are considered to be NBMA networks. Frame Relay is a WAN
protocol that operates at the physical and data link layers of the Open System
Interconnection (OSI) reference model. This protocol is standardized by both the
International Telecommunication Union Telecommunications Standardization Sector
(ITU-T) and American National Standards Institute (ANSI).
Frame Relay uses statistical multiplexing techniques to provide network access in a
packet-switched network. It is strictly a Layer 2 protocol suite. Being a Layer 2 protocol
enables Frame Relay to offer higher performance WAN applications (such as LAN
interconnection) than the older protocols (such as X.25), which incorporated Layer 3
functions. Given these performance benefits, Frame Relay is a popular WAN medium.
However, it has some limitations with regard to IP multicast. To illustrate, Frame Relay
is a Layer 2 nonbroadcast multiaccess (NBMA) network protocol. IP multicast
networks are designed to utilize the capabilities of Layer 2 broadcast media such as on a
LAN.   Your Comment




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