1,003 views
–1 votes
–1 votes

Which combination of the following features will suffice to characterize an OS as a multi-programmed OS?

(A) More than one program may be loaded into main memory at the same time for execution.
(B) If a program waits for certain events such as I/O, another program is immediately scheduled for execution.
(C) If the execution of a program terminates, another program is immediately scheduled for execution.

 

  1. A
  2. A and B
  3. A and C
  4. A, B and C

 

2 Answers

2 votes
2 votes
so as we know that there are 5 classes where d and e class are not used for networking and there is no subnet in them . so basically if classes is not given subnet can vary .but here it is simple d and e cannot be used so we just ruled out the d and e definitely this is class c network. subnet mast that tells the number of 1 bits in the network id field are 8+8+5=21. no of subnet will be see the last octate . 8-5=3 so we have actually borrowed 3 but from the network id .so number of subnet will be 2^3=8 . 2^ because by one bit i can only represent 2 possiblity

assuming classfull ip addressing. for cidr the data is insufficient to tell the number of subnets.
0 votes
0 votes
255.255.31.0=11111111.11111111.00011111.00000000 total no of ones =21 and 0s = 11

no of hosts = 2^21-11=2^10-2

no of sub nets for class a network nid+subnet id=21=>8+subnet id=21=>13

2^13 hosts for class a

in same way for class b subnetid=21-16=5=>2^5

class c not possible

Related questions

0 votes
0 votes
1 answer
1
krishna uruturu asked Jul 9, 2015
460 views
If it is super net mask how many super net bits is there
1 votes
1 votes
1 answer
3
rahuldb asked Nov 6, 2016
1,608 views
Find out the subnet address if destination is 198.47.34.31 and subnet mask is 255.255.224.0.Please answer with working
1 votes
1 votes
1 answer
4
rahuljai asked Dec 15, 2018
1,163 views
What’s the right answer ?, please have a look at Q.5(here) they are appending network bits but this question doesn't.