Computer Network Test Set 4
| Q16➡ | In RSA P and Q are chosen as very large prime number Compute n = pq and Φ(n) = (n-1)(q-1) Letter e encryption key chosen. How is this encryption key selected? |
| i ➥ e is chosen as a relative prime to q |
| ii ➥ e is chosen as a relative prime to p |
| iii ➥ e is chosen as a relative prime to Φ(n) |
| iv ➥ e is chosen as a relative prime to n |
| Q17➡ | Determine the maximum length of the cable (in Km) for transmitting data at a rate of 700 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/sec. |
| i ➥ 2.152 |
| ii ➥ 2 |
| iii ➥ 1.428 |
| iv ➥ 1.75 |
| Q18➡ | Assume that source S and destination D are connected through five intermediate routers R1, R2,R3,R4 and R5. Determine how many times each packet has to visit the Network layer and the Data Link layer during transmission from S to D? |
| i ➥ Network Layer: 7 times, Data Link Layer: 12 times |
| ii ➥ Network Layer: 5 times, Data Link Layer: 12 times |
| iii ➥ Network Layer: 12 times, Data Link Layer: 12 times |
| iv ➥ Network Layer: 7 times, Data Link Layer: 7 times |
| Q19➡ | Considering the following key using a block of five characters, encryption of the message “NETWORKING” using the Transposition Cipher is: Plaintext : 5 4 3 2 1 Ciphertext 1 2 3 4 5 |
| i ➥ NREKTIWNOG |
| ii ➥ OGWNTIEKNR |
| iii ➥ OWTENGNIKR |
| iv ➥ GNIKROWTEN |
| Q20➡ | Match the following. List I List II I)Attenuation P) Loss of energy II)Shannon capacity Q) Changes in shape of the signal Ill)Nyquist bit rate R) Noisy channel IV)Distortion S) Noiseless channel |
| i ➥ I-P, II-Q,III-R,IV-S |
| ii ➥ I-P, II-R,III-S,IV-Q |
| iii ➥ I-S, II-R,III-Q,IV-P |
| iv ➥ I-Q, II-P,III-S,IV-R |
Weekly Test GATE/NTA NET CSA
16.(iii)
17.(ii)
18.(i)
19.(iii)
20.×
Ans 16 – e is chosen as a relative prime to Φ(n)
Ans 17 – 1.428
Ans 18 – Network Layer: 7 times, Data Link Layer: 12 times
Ans 19 – OWTENGNIKR
Ans 20 – I-P, II-R,III-S,IV-Q
16-c
19-c
20-b
Ans16-iii
Ans17-ii
Ans18-i
Ans19-iii
Ans20-iv
16) C
17) B
18) A
19) C
20) B
16,ii
17,ii
18,ii
19,ii
20,ii