Introduction of Information Communication Network 喵查铺子-Page 15

中国大学MOOC答案

The zero-bit insert/delete method states that if the sender is in a sequence of bits between two F flags. How many successive ones are detected, if it increments the number by one, regardless of whether the bit after it is 0 or 1.

A、4 B、5 C、6 D、8 喵查答案：5 ……继续阅读 »

中国大学MOOC答案

Assume that the data link layer adopts go-back-N mode for error control, and the sender has already sent the frames numbered from 0 to 7. When the timer times out and the confirmation of frame 1 does not return, what is the number of frames that the sender needs to retransmit?

A、1 B、2 C、6 D、7 喵查答案：7 ……继续阅读 »

中国大学MOOC答案

Among the common operation modes in HDLC, which one can start the transmission process by both the master station and the slave station?

A、Asynchronous balanced mode B、Unbalanced asynchronous response mode C、Non-equilibrium normal response mode D、A, B, C 喵查答案：Asynchronous balanced mode ……继续阅读 »

中国大学MOOC答案

In order to carry out error control, the transmitted data frame must be checked. Which kind of verification method is widely used in LAN?

A、Parity B、Hamming C、Gray D、Cyclic Redundancy (CRC) 喵查答案：Cyclic Redundancy (CRC) ……继续阅读 »

中国大学MOOC答案

Which is the most accurate description of the characteristics of CRC among the following options?

A、Check each character one by one B、Can check out more than 99% of errors C、The error with even number of bit errors cannot be checked D、Is not as reliable as the parity check meth……继续阅读 »

中国大学MOOC答案

The types of errors in data transmission mainly include burst errors and ( )?

A、Calculation error B、Parity error C、Random error D、CRC check error 喵查答案：Random error ……继续阅读 »

中国大学MOOC答案

In an ideal channel, data is error-free from the sending end to the receiving end, but in practical application, data transmission will produce errors. Which one is not a factor affecting the error due to physical transmission medium?

A、Abnormality and attenuation of signal amplitude, frequency and phase randomly generated on physical lines B、Echo effect caused by reflection of electrical signals on the line C、T……继续阅读 »

中国大学MOOC答案

In CRC code calculation, a binary bit string can be associated with a unary polynomial containing only 0 or 1 coefficients. For example, the polynomial corresponding to bit string 101101 is（）?

A、x^6+x^4+x^3+1 B、x^5+x^3+x^2+1 C、x^5+x^3+x^2+x D、x^6+x^5+x^4+1 喵查答案：x^5+x^3+x^2+1 ……继续阅读 »

中国大学MOOC答案

If the frame sequence number of the data link occupies 4 bits, the maximum sender window should be?

A、13 B、14 C、15 D、16 喵查答案：15 ……继续阅读 »

中国大学MOOC答案

In CRC cyclic redundancy calculation, a binary bit string can be corresponded to a unary polynomial with only two coefficients of 0 or 1. For example, the string of binary numbers corresponding to the polynomial x^5+x^4+x+1 should be?

A、110011 B、111100 C、1100110 D、110010 喵查答案：110011 ……继续阅读 »

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The zero-bit insert/delete method states that if the sender is in a sequence of bits between two F flags. How many successive ones are detected, if it increments the number by one, regardless of whether the bit after it is 0 or 1.

Assume that the data link layer adopts go-back-N mode for error control, and the sender has already sent the frames numbered from 0 to 7. When the timer times out and the confirmation of frame 1 does not return, what is the number of frames that the sender needs to retransmit?

Among the common operation modes in HDLC, which one can start the transmission process by both the master station and the slave station?

In order to carry out error control, the transmitted data frame must be checked. Which kind of verification method is widely used in LAN?

Which is the most accurate description of the characteristics of CRC among the following options?

The types of errors in data transmission mainly include burst errors and ( )?

In an ideal channel, data is error-free from the sending end to the receiving end, but in practical application, data transmission will produce errors. Which one is not a factor affecting the error due to physical transmission medium?

In order to avoid the disappearance of frames during transmission, what method does the data link layer adopt?

What is the probability that binary bits are transmitted incorrectly in the data transmission system called?

Which is wrong among the following descriptions of bit error rate?

Which will only retransmit the wrong data frame among the following error control methods?

Which control method is primarily used by the sliding window protocol?

In CRC code calculation, a binary bit string can be associated with a unary polynomial containing only 0 or 1 coefficients. For example, the polynomial corresponding to bit string 101101 is（）?

If the frame sequence number of the data link occupies 4 bits, the maximum sender window should be?

In CRC cyclic redundancy calculation, a binary bit string can be corresponded to a unary polynomial with only two coefficients of 0 or 1. For example, the string of binary numbers corresponding to the polynomial x^5+x^4+x+1 should be?