ISTM 310 MAIN EXAMINATION 2026 SET QUESTIONS
AND ANSWERS GRADED A+
✔✔Adding repeaters or amplifiers to a circuit - ✔✔_____________ is an effective way
to prevent attenuation.
- Shielding wires
- Adding fluorescent lights
- Adding repeaters or amplifiers to a circuit
- Changing multiplexing techniques
- Shorting a circuit
✔✔physically separating the cables from other communication cables - ✔✔Which of the
following is way to reduce or eliminate crosstalk on a circuit?
- physically separating the cables from other communication cables
- adding repeaters or amplifiers to a circuit
- reducing the length of the cable
- adding fluorescent lights
- shorting a circuit
✔✔repeaters - ✔✔On digital circuits, we use _________ to reshape the incoming signal
and prevent attenuation.
- amplifiers
- repeaters
- multiplexers
- digitizers
- modems
✔✔pulse code checking - ✔✔Which of the following is not an error detection method
used in the data link layer?
- parity checking
- cyclic redundancy checking
- CRC-32
- pulse code checking
- odd parity
✔✔00011011 - ✔✔With odd parity (assume that the parity bit (in bold) has been placed
at the end of each of the following) and a 7-bit ASCII code, which of the following is
incorrect?
- 01101011
- 00011011
- 00100101
- 10110110
- 11111110
, ✔✔50% - ✔✔The probability of detecting an error, given that one has occurred, using
parity checking is about:
- 100%
- 0%
- 50%
- 75%
- 98%
✔✔about 50% for either even or odd parity - ✔✔Using parity, the probability for
detecting an error, given that one has occurred, is:
- about 50% for either even or odd parity
- about 70% for even parity and 30% for odd parity
- about 30% for even parity and 70% for odd parity
- about 0% for either even or odd parity
- about 100% for either even or odd parity
✔✔> 99% - ✔✔The probability of detecting an error, provided that one has occurred,
using cyclic redundancy checking is about:
- 75%
- 0%
- exactly 100%
- 50%
- > 99%
✔✔a receiver that detects an error in a message simply asks the sender to retransmit
the message until it is received without error - ✔✔ARQ means that:
- a receiver that detects an error in a message simply asks the sender to retransmit the
message until it is received without error
- the common carrier Automatically Returns Queries to the subscriber upon receipt of
such queries
- a sender is using a data link protocol called Asynchronous Repeating reQuest
- a fiber optic cable meets the American Registered Quality, a certification standard for
use in high-quality data communication transmission lines
- a sender is using a parity scheme called Array Resource Quality
✔✔is sent by the recipient if the message contains an error - ✔✔In ARQ, a NAK:
- is sent by the recipient if the message was received without error
- is sent by the sender at the same time as it sends a data packet
- is sent by the recipient if the message contains an error
- refers to non-asynchronous Kermit technique
- means that the sender should continue with sending the next message
✔✔HDLC - ✔✔________ has essentially replaced SDLC and offers a larger sliding
window.
- Ethernet
AND ANSWERS GRADED A+
✔✔Adding repeaters or amplifiers to a circuit - ✔✔_____________ is an effective way
to prevent attenuation.
- Shielding wires
- Adding fluorescent lights
- Adding repeaters or amplifiers to a circuit
- Changing multiplexing techniques
- Shorting a circuit
✔✔physically separating the cables from other communication cables - ✔✔Which of the
following is way to reduce or eliminate crosstalk on a circuit?
- physically separating the cables from other communication cables
- adding repeaters or amplifiers to a circuit
- reducing the length of the cable
- adding fluorescent lights
- shorting a circuit
✔✔repeaters - ✔✔On digital circuits, we use _________ to reshape the incoming signal
and prevent attenuation.
- amplifiers
- repeaters
- multiplexers
- digitizers
- modems
✔✔pulse code checking - ✔✔Which of the following is not an error detection method
used in the data link layer?
- parity checking
- cyclic redundancy checking
- CRC-32
- pulse code checking
- odd parity
✔✔00011011 - ✔✔With odd parity (assume that the parity bit (in bold) has been placed
at the end of each of the following) and a 7-bit ASCII code, which of the following is
incorrect?
- 01101011
- 00011011
- 00100101
- 10110110
- 11111110
, ✔✔50% - ✔✔The probability of detecting an error, given that one has occurred, using
parity checking is about:
- 100%
- 0%
- 50%
- 75%
- 98%
✔✔about 50% for either even or odd parity - ✔✔Using parity, the probability for
detecting an error, given that one has occurred, is:
- about 50% for either even or odd parity
- about 70% for even parity and 30% for odd parity
- about 30% for even parity and 70% for odd parity
- about 0% for either even or odd parity
- about 100% for either even or odd parity
✔✔> 99% - ✔✔The probability of detecting an error, provided that one has occurred,
using cyclic redundancy checking is about:
- 75%
- 0%
- exactly 100%
- 50%
- > 99%
✔✔a receiver that detects an error in a message simply asks the sender to retransmit
the message until it is received without error - ✔✔ARQ means that:
- a receiver that detects an error in a message simply asks the sender to retransmit the
message until it is received without error
- the common carrier Automatically Returns Queries to the subscriber upon receipt of
such queries
- a sender is using a data link protocol called Asynchronous Repeating reQuest
- a fiber optic cable meets the American Registered Quality, a certification standard for
use in high-quality data communication transmission lines
- a sender is using a parity scheme called Array Resource Quality
✔✔is sent by the recipient if the message contains an error - ✔✔In ARQ, a NAK:
- is sent by the recipient if the message was received without error
- is sent by the sender at the same time as it sends a data packet
- is sent by the recipient if the message contains an error
- refers to non-asynchronous Kermit technique
- means that the sender should continue with sending the next message
✔✔HDLC - ✔✔________ has essentially replaced SDLC and offers a larger sliding
window.
- Ethernet
