Computer Network Test Set1
| Q1➡ | You are working with a network that is 172.16.0.0 and would like to support 600 hosts per subnet. What subnet mask should you use? |
| i ➥ 255.255.192.0 |
| ii ➥ 255.255.224.0 |
| iii ➥ 255.255.252.0 |
| iv ➥ None of the options |
| Q2➡ | In the congestion avoidance algorithm, the size of the congestion window increases ___________ until congestion is detected. |
| i ➥ Suddenly |
| ii ➥ Multiplicatively |
| iii ➥ Exponentially |
| iv ➥ Additively |
| Q3➡ | Using ‘RSA’ public key cryptosystem, if p=3, q=11 and d=7, find the value of e and encrypt the number ’19’ |
| i ➥ 20,19 |
| ii ➥ 33,11 |
| iii ➥ 77,28 |
| iv ➥ 3,28 |
| Q4➡ | Three-way handshake is used for |
| i ➥ Reliable establishment of a connection in the Internet transport layer |
| ii ➥ Exchange of packets at data link layer |
| iii ➥ Dropping a TCP connection |
| iv ➥ Multiplexing between three hosts on the same LAN |
| Q5➡ | A student is browsing the website wvw.youhoo.co.in She clicks on a URL which is from the same website. Which of the following is a more accurate description of the sequence of events that takes place after the click event I. 3-way TCP handshake event between client and server II. HTTP get request event IIL DNS query and response event |
| i ➥ I, II, III |
| ii ➥ III, II, I |
| iii ➥ III, I, II |
| iv ➥ None of these |
Weekly Test GATE/NTA NET CSA
Answer-
1. (iii)
Host ID = ⌈log2 600⌉= 10
subnet mask: 11111111. 11111111. 11111100.00000000
subnet mask: 255. 255.252.0
2. (iv)Additively
3. (iv) n = p*q.= 3*11= 33
Phi(n) = (p-1)*(q-1) = 2*10=20
e*d mod phi(n) ==1
e*7 mod 20===1
Then e= 3
CT = (PT ki power e) Mod n
= 19³mod 33
= 28
4.(i) Reliable establishment of a connection in the Internet transport layer
5.(ii) III, II, I
Ans 1 – 255.255.252.0
Ans 2 – Additivity
Ans 3 – 3,28
Ans 4 – Exchange of packets at data link layer
Ans 5 – 1,2,3
Ans 1-iii
Ans2-iv
Ans3-iv
Ans4-i
Ans5-ii
1-c
2-d
3-d
4-a
5-a
Answer 1, I
2, ii
3, III
4, iii
5, ii
1) C
Explanation- Subnet mask
11111111:11111111:11111100:00000000
2) D
3) D
4) C
5) A