Practice Quiz in Digital and Data Communication Networks Part 9

(Last Updated On: December 20, 2017)

Quiz in Digital and Data Communication Networks

This is the Online Practice Quiz in Digital and Data Communication Networks Part 9 as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

Continue Part IX of the Online Practice Quiz

Quiz in TITLE

Question 81. A protocol is a set of rules governing a time sequence of events that must take place

A. Between peers

B. Between nonpeers

C. Across an interface

D. None of these


Question 82. The OSI reference model defines the functions for seven layers of protocols

A. Including the user and communications medium

B. Not including the user or communications medium

C. Including the communications medium but not the user

D. Including the user but not the communications medium


Question 83. Which of the following transmission systems provides the highest data rate to an individual device?

A. Voiceband modem

B. Local area network

C. Computer bus

D. Digital PBX


Question 84. One primary difference between Digital Data Communications Message Protocol (DDCMP) and Synchronous Data Link Control (SDLC) is

A. DDCMP does not have a transparent mode

B. SDLC does not use a CRC

C. DDCMP has a message header

D. DDCMP does not require special hardware to find the beginning of a message


Question 85. The X.25 standard is

A. Required for all packet switching networks

B. A recommendation of the CCITT

C. A complete description of a public data network

D. Used by all packet terminals


Question 86. Which of the following is not possible in a digital PBX using twisted pair transmission?

A. Computer port concentration

B. 64-kbps data circuits

C. High-speed file transfers

D. Transmission up to several thousand feet


Question 87. The Baudot code uses how many bits per symbol?

A. 9

B. 7

C. 5

D. 8


Question 88. Which of the following is a characteristic of a LAN?

A. Parallel transmission

B. Unlimited expansion

C. Low cost access for low bandwidth channels

D. Application independent interfaces


Question 89. The electrical state of the control leads in a serial interface is a concern of

A. The physical layer protocol

B. The data link-layer protocol

C. The network-layer protocol

D. None of these


Question 90. The transmission signal coding method for T1 carrier is called

A. Binary

B. NRZ

C. Bipolar

D. Manchester

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