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What protocol does Point−to−Point Protocol(PPP) use to identify the Network layer protocol?

A. NCP
B. ISDN
C. HDLC
D. LCP

Answer & Solution
Option: A
Explanation :Network Control Protocol is used to help identify the Network layer protocol used in the packet.
Network Control Protocol (NCP) is a set of protocols forming a part of Point − to − Point Protocol (PPP). PPP is a data link layer protocol that is used to transmit multiprotocol data between two directly connected (point-to-point) computers. PPP is composed of link control protocol (LCP), authentication protocol (AP) and network control protocol (NCP). NCPs are used for negotiating the parameters and facilities for the network layer. For every higher-layer protocol supported by PPP, one NCP is there.
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