Final answer:
The locally significant identifier used in a frame relay network to reference a virtual circuit is the DLCI (Data Link Connection Identifier). Unlike global identifiers, DLCIs are only locally significant, meaning they are unique within a specific local environment of the frame relay network. The correct answer B.
Step-by-step explanation:
The locally significant identifier used by a frame relay network to reference a virtual circuit is DLCI, which stands for Data Link Connection Identifier. The DLCI serves as a unique identifier that enables the frame relay network to direct data to the correct virtual circuit during transmission. Unlike other networking technologies that might use different types of identifiers, such as VPI/VCI in ATM networks, or MAC addresses which are hardware addresses used in various networking technologies including Ethernet, the frame relay relies on DLCI values that are locally significant within a particular connection.
It is important to know that the DLCI does not have intrinsic meaning outside of the local network. They are specific to the local portion of the frame relay network, meaning they must be mapped appropriately when crossing network boundaries or interfacing with other types of networks. Different equipment or networks can reuse the same DLCI numbers, because they are only expected to be unique within their local environment.
Understanding the purpose of the DLCI is crucial for configuring and managing a frame relay network. It is also an essential concept for students studying for networking certifications or looking to deepen their understanding of communications protocols.