Which statement is true of a Layer 2 circuit?
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A. B. C. D.C
The correct answer is C. Layer 2 circuits use LDP (Label Distribution Protocol) for signaling.
Explanation:
A Layer 2 circuit is a point-to-point connection that provides a transparent Ethernet bridge between two sites. It is commonly used to connect two data centers or to extend a LAN over a wide area network (WAN). Layer 2 circuits operate at the Data Link layer (Layer 2) of the OSI (Open Systems Interconnection) model.
To establish a Layer 2 circuit, the two endpoints must agree on how to label the frames that are transmitted over the circuit. This labeling is done using a protocol called LDP. LDP is a protocol that is used to distribute labels in MPLS (Multiprotocol Label Switching) networks. LDP labels each frame with a unique identifier, allowing the network to forward the frames from one endpoint to the other without changing the MAC addresses of the devices.
BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between different autonomous systems. BGP is not used for signaling in Layer 2 circuits.
OSPF (Open Shortest Path First) is a routing protocol used to distribute routing information within a single autonomous system. OSPF is not used for signaling in Layer 2 circuits.
RSVP (Resource Reservation Protocol) is a protocol used to reserve network resources for specific applications. RSVP is not used for signaling in Layer 2 circuits.
Therefore, the correct answer is C. Layer 2 circuits use LDP for signaling.