GATE CSE 2017 Paper 1 — page 15

Questions 43–45 of 65. Imported answers require review unless explicitly marked reviewed.

Consider the following grammar:

stmt

if expr then expr else expr; stmt

expr

term relop term

term

number

[0-9]

where relop is a relational operator (e.g.,<, >, …), ò refers to the empty statement, and if, then, else are terminals.

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In a RSA cryptosystem, a participant A uses two prime numbers

and

to generate her public and private keys. If the public key of A is 35, then the private key of A is __________.

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The values of parameters for the Stop-and-Wait ARQ protocol are as given below: Bit rate of the transmission channel = 1 Mbps. Propagation delay from sender to receiver = 0.75 ms. Time to process a frame = 0.25 ms. Number of bytes in the information frame = 1980. Number of bytes in the acknowledge frame = 20. Number of overhead bytes in the information frame = 20.

Assume that there are no transmission errors. Then, the transmission efficiency (expressed in percentage) of the Stop-and-Wait ARQ protocol for the above parameters is __________ (correct to 2 decimal places).

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2017 · Paper 1

Question 43

Question 44

Question 45