data link control layer

There are _______ types of HDLC frames.

• 1

• 2

• 3

• 4

An HDLC _______ is used to transport user data and control information.

• • I-frame

• • S-frame

• • U-frame

• • A-frame

In PPP, _______ is a three-way hand-shaking authentication protocol in which the password is kept secret; it is never sent online.

• NCP

• LCP

• CHAP

• PAP

In _________, the configuration is balanced. The link is point-to-point, and each station can function as a primary and a secondary.

• ABM

• NRM

• ARM

• NBM

Byte stuffing means adding a special byte to the data section of the frame when there is a character with the same pattern as the ______.

• trailer

• flag

• header

• none of the choices

_________framing uses two categories of protocols: character-oriented and bit-oriented.

• Fixed-size

• Variable-size

• none of the choices

• Standard

In _________ protocols, we use ________.

• bit-oriented; character stuffing

• character-oriented; bit stuffing

• character-oriented; byte stuffing

• none of the choices