ISRO CSE 2023 ⋆ CSE Study247

Question 11

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2023 PYQ

In the context of parsing techniques, LL(1) refers to:

A Grammars that parse the input from left to right, produce a rightmost derivation, with a lookahead of 1 symbol. B Grammars that parse the input from left to right, produce a leftmost derivation, with a lookahead of 1 symbol. C Grammars that parse the input from left to right, and backtrack at most once. D Grammars that parse the input from right to left, produce a leftmost derivation, and backtrack at most once.

📘 Solution & Detailed Explanation

🔢 Step-by-Step Solution

Detailed Explanation:

CODE

In LL(1):
   - First L: Left-to-right scan of input
   - Second L: Leftmost derivation
   - 1: 1 symbol lookahead

Matches Option B.

Question 12

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2023 PYQ

A host in an organization is connected to a host in another organization using 1 Gbps link with RTT = 25 ms. The network administrator tuned the network for 1000 Bytes packet size. To achieve channel utilization > 96%, what should be the window size (in number of packets)?

A 3000 B 3125 C 3250 D 3300

Question 13

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2023 PYQ

In a computer network, the minimum frame size is 1500 bytes. What will be the data transfer speed in this network over 1 Km cable, if the signal speed in the cable is 250000 Km/sec and no repeaters are used?

A 1 Gbps B 100 Mbps C 500 Mbps D 1.5 Gbps

Question 14

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2023 PYQ

For internal data communication through computer network, a 5 layer protocol hierarchy is proposed. Applications generate 270 bytes long messages. At each layer, a 6-byte header is added. What fraction of network bandwidth (in %) is wasted due to headers?

A 5% B 20% C 10% D 15%

Question 15

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2023 PYQ

Match the OSI layers with their primary functions:
(i) Physical Layer -> (P) Bit transmission over physical medium
(ii) Data Link Layer -> (Q) Framing, error detection, node-to-node delivery
(iii) Network Layer -> (R) Routing packets across networks
(iv) Transport Layer -> (S) End-to-end process communication & flow control

A (i)-(P), (ii)-(Q), (iii)-(R), (iv)-(S) B (i)-(Q), (ii)-(P), (iii)-(S), (iv)-(R) C (i)-(R), (ii)-(S), (iii)-(P), (iv)-(Q) D (i)-(S), (ii)-(R), (iii)-(Q), (iv)-(P)