3 votes 3 votes What is IP class and number of sub-networks if the subnet mask is $255.224.0.0$? Class $A$, $3$ Class $A$, $8$ Class $B$, $3$ Class $B$, $32$ Computer Networks isro2013 computer-networks subnetting + – makhdoom ghaya asked Apr 27, 2016 makhdoom ghaya 5.8k views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply cse23 commented Jun 27, 2016 reply Follow Share 255.224.0.0 gives no of 1's followed by no. of 0's where 1 represent network portion here no. of 1's = 11 so, NID +SID = 11 SID =11-NID =11-8(class A) =3 bits are used for subnets no. of sub network= 2^3-2 =6 but 6 is not in the option so in that case we consider, no. of subnets as 2^3 which is 8 answer is (B) 2 votes 2 votes anchitjindal07 commented Apr 11, 2017 reply Follow Share Though I also calculated answer to be option (b) but In answer key, answer given is option (A) 0 votes 0 votes Nagasaikanmatha commented Nov 9, 2021 reply Follow Share I dont think we need to subtract 2 from number of subnets. we will subtract 2 from number of hosts 0 votes 0 votes Please log in or register to add a comment.
Best answer 5 votes 5 votes Subnet mask is 11111111.11100000.00000000.00000000 here 8 bit for network ( all 8 ones ) And 8 bit for network id belong to class A And next 3 ones used for subnet . Since 3 ones so number of subnet is 2^3=8. So answer is b Dexter answered Apr 28, 2016 selected Mar 12, 2018 by Soumya29 Dexter comment Share Follow See all 0 reply Please log in or register to add a comment.
3 votes 3 votes Answer B) class A ,8 we calculate subnetwork 2^3=8 srestha answered Apr 27, 2016 srestha comment Share Follow See all 2 Comments See all 2 2 Comments reply dhairya commented Apr 28, 2016 reply Follow Share how can it be class A..? It should be class B.. ans should be between C &D –2 votes –2 votes dhairya commented Apr 28, 2016 reply Follow Share @srestha sorry u r right..ans is B 1 votes 1 votes Please log in or register to add a comment.
1 votes 1 votes Given mask is 255.224.0.0 No. of 1's are 11. So no. of subnetworks = (given mask - default mask) = 11- 8 = 3 Answer is A. krishnagate answered May 3, 2017 krishnagate comment Share Follow See all 0 reply Please log in or register to add a comment.