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Which of the following PPP sub-protocols negotiates authentication?
CDP
NTP
PPPoE
NCP
LCP
The PPP layered protocol has three elements: 1) Encapsulation method, 2) LCP (Establish, configure and test the link), 3) NCP (protocol used for negotiation of multiple network layered routed protocols such as IP to be used for a PPP communication). PPPoE is a method for transmitting PPP over Ethernet, it is not a subprotocol.
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