1
GATE CSE 2009
MCQ (Single Correct Answer)
+2
-0.6
While opening a TCP connection, the initial sequence number is to be derived using a time-of-day (ToD) clock that keeps running even when the host is down. The low order 32 bits of the counter of the ToD clock is to be used for the initial sequence numbers. The clock counter increments once per millisecond. The maximum packet lifetime is given to be 64s.

Which one of the choices given below is closest to the minimum permissible rate at which sequence numbers used for packets of a connection can increase?

A
0.015/s
B
0.064/s
C
0.135/s
D
0.327/s
2
GATE CSE 2009
MCQ (Single Correct Answer)
+2
-0.6
In the RSA public key cryptosystem, the private and public keys are (e, n) and (d, n) respectively, where n = p$$ \times $$q and p and q are large primes. Besides, n is public and p and q are private. Let M be an integer such that 0 < M < n and f(n) = (p - 1)(q - 1). Now consider the following equations.

I. M'= Me mod n
M = (M')d mod n

II. ed ≡ 1 mod n

III. ed ≡ 1 mod $$\phi $$(n)

IV. M'= Me mod $$\phi $$(n)
M = (M')d mod $$\phi $$(n)

Which of the above equations correctly represent RSA cryptosystem?
A
I and II
B
I and III
C
II and IV
D
III and IV
3
GATE CSE 2009
MCQ (Single Correct Answer)
+1
-0.3
How many $$32k$$ x $$1$$ $$RAM$$ chips are needed to provide a memory capacity of $$256$$ $$K$$-bytes?
A
$$8$$
B
$$32$$
C
$$64$$
D
$$128$$
4
GATE CSE 2009
MCQ (Single Correct Answer)
+2
-0.6
Consider a $$4$$-way set associative cache (initially empty) with total $$16$$ cache blocks. The main memory consists of $$256$$ blocks and the request for memory blocks is in the following order:
0, 255, 1, 4, 3, 8, 133, 159, 216, 129, 63, 8, 48, 32, 73, 92, 155.

Which one of the following memory block will NOT be in cache if $$LRU$$ replacement policy is used?

A
$$3$$
B
$$8$$
C
$$129$$
D
$$216$$
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