200-101 Question #47: Real Exam Question with Answer & Explanation

The correct answer is B: PPP. PPP (Point-to-Point Protocol) is the correct answer because it is the only Layer 2 protocol listed that: (1) supports both synchronous and asynchronous serial circuits, and (2) has built-in security mechanisms via its authentication protocols - PAP (Password Authentication Protoc

Question

Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?

Options

AHDLC
BPPP
CX.25
DFrame Relay
EATM

Explanation

PPP (Point-to-Point Protocol) is the correct answer because it is the only Layer 2 protocol listed that: (1) supports both synchronous and asynchronous serial circuits, and (2) has built-in security mechanisms via its authentication protocols - PAP (Password Authentication Protocol) and CHAP (Challenge Handshake Authentication Protocol). HDLC (A) supports synchronous circuits only and has no built-in authentication. Frame Relay (D) and ATM (E) have no built-in authentication. X.25 (C) is an older packet-switching protocol without the same authentication features.

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