0 votes 0 votes Number of subnets can be formed by using the subnet mask $255.255.248.0$ in a class B network _________ Computer Networks tbb-cn-1 numerical-answers + – Bikram asked Nov 26, 2016 edited Aug 25, 2019 by go_editor Bikram 390 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 3 votes 3 votes There are 16bits in NID and 16bits in HID in Class B network. Now 248 in binary is 11111 000 5 number of 1 in HID part So $2^5 = 32$ total subnets are there . http://www.ietf.org/rfc/rfc1878.txt Hence number of subnets are 32. Bikram answered Dec 21, 2016 selected Mar 4, 2017 by Bikram Bikram comment Share Follow See all 2 Comments See all 2 2 Comments reply reena_kandari commented Dec 28, 2016 reply Follow Share Why we subtracted 2 here 32 subnets are possible.We subtract in case of host but 32 subnets are possible here. 2 votes 2 votes Bikram commented Dec 29, 2016 reply Follow Share yes , you are correct .We should not subtract . Earlier we used to but now we dont waste them , "This practice is obsolete! Modern software will be able to utilize all definable networks" this is exact line mentioned in this RFC http://www.ietf.org/rfc/rfc1878.txt 5 votes 5 votes Please log in or register to add a comment.