00:01
So we are asked to find a couple networking components given a ip address.
00:08
That ip address is going to be 192 -1681 .134, and that's going to be slash 27 address.
00:17
Now in order to calculate the usable number of host ips, we first have to find the subnet mask.
00:30
And we're going to do so by counting the number of bits, we're given 27, meaning we have to fill out 27 ones and do the binary math to come to each of the octet's values.
00:46
So for instance, this octet's value, the class a value is going to be 255.
00:54
Same with the class b, that's also going to be 255.
00:58
Class c is going to be 255 as well.
01:05
And lastly, the d is actually only going to be 2255.
01:13
24.
01:15
That's because 128 plus 64 plus 322 is equal to 24.
01:22
So that is why that is 224 at the end.
01:25
That's how binary math works if you need to look up a resource on that.
01:30
There's a couple available on how to do the binary math portions.
01:35
Now next we need to figure out how many usable hosts are based off that subnet mask.
01:42
To do so we take the value to 56 and minus 224.
01:51
224 is still a part of the network id.
01:54
So this is going to tell us how many ips are going to be in each range, in each subnet range.
02:01
So that's going to be 32.
02:03
Now for the usable host ips we have to subtract two.
02:08
So we have to keep in mind we have to have a network id and the broadcast ip.
02:21
So that's only going to leave us with 30 host ips.
02:25
Now to do the actual subnet division here we're going to start out with 192 168 1 .0 that is the first of the actual subnet and we're going to calculate it we're going to add 32 ips with that starting from zero and that's going to get to 31 in the last octet so that is the first subnet range we're going to keep going until we get to the values that fall within 192 -1681 .134.
03:06
So let's keep going at the bottom.
03:08
So we're going to add another 32 to a different subnet, starting with 32.
03:25
That goes to 63, then it goes to 64 in the next subnet, all the way to 95 in the last octets.
03:46
The first three octets are going to be the same here.
03:48
I apologize, this is supposed to be a 168 up here.
03:59
96 is the next start.
04:08
That goes to 127.
04:11
Then this should be our range in which, this next range coming up, should be the range of which our ip falls.
04:18
That's going to start with 128, and that's going to go to 159.
04:27
So this is going to be the range that the 134 address falls into.
04:33
And we could see this is going to be our network id and then this is going to be a broadcast ip and the usable host range is going to be plus one to the network id and minus one to the broadcast ip so that is going to be 192 168 one one twenty nine that's going to go to so we're given a second address to analyze a couple key components of the network and that address is going to start 160, 150, 140, and 130.
05:45
And then it's a slash 18.
05:48
Now when we go to find the sub debt mask, we're going to count out 18 bits.
05:53
First octet is 255.
06:05
Second octet also 255...