Which of the following WAN technologies swaps the header on a packet when internally switching from one provider router to another?
A.
ATM B.
Frame relay C.
MPLS D.
PPP.
C.
Which of the following WAN technologies swaps the header on a packet when internally switching from one provider router to another?
A.
ATM
B.
Frame relay
C.
MPLS
D.
PPP.
C.
The correct answer is C, MPLS.
MPLS (Multiprotocol Label Switching) is a WAN (Wide Area Network) technology that swaps the label on a packet when internally switching from one provider router to another. This process is called "label switching" and allows MPLS to forward packets more quickly and efficiently than other WAN technologies.
MPLS works by assigning a unique label to each packet as it enters the MPLS network. The label contains information about the packet's destination and the path it should take through the network. As the packet travels through the MPLS network, each router uses the label to quickly determine the next hop for the packet. When the packet reaches its final destination, the label is removed and the packet is delivered to the intended recipient.
MPLS is commonly used by businesses and service providers to connect geographically dispersed sites and provide secure, reliable connectivity. It offers several advantages over other WAN technologies, including improved network performance, traffic engineering capabilities, and support for multiple protocols.
ATM (Asynchronous Transfer Mode) is a WAN technology that uses fixed-length cells to transport data. Frame Relay is a WAN technology that uses variable-length frames to transport data. PPP (Point-to-Point Protocol) is a WAN technology that provides a secure, point-to-point connection between two devices. None of these technologies use label switching to forward packets through the network.