Question;
Suppose an ISP owns the block of addresses of the form 128.119.40.64/25.
Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. What are the prefixes (of form a.b.c.d/x) for the four subnets?
Answer;
Four equal size subnets: 128.119.40.64/28, 128.119.40.80/28, 128.119.40.96/28,
128.119.40.112/28.
It is interesting because netmask is 25. and if we split out to 4 subnet we should take 2 bit from host.
and will be 25+2= 27.
why netmask is not 27? why 28?
actually you send me this page yesterday. and i read several times. i learnt much. but i need to read much more times. sorry btw for this topic. another time i create a topic according to rule.
– bkk Dec 16 '19 at 20:22