1
00:00:06,370 --> 00:00:12,800
OK so the next subnet is 1 9 2 1 6 8 1 64 slash 26.

2
00:00:12,800 --> 00:00:19,540
I'll copy the previous example but remember this is actually a different subnet.

3
00:00:19,540 --> 00:00:29,900
Now the subnet address is slash 64 so we'll need to update these values in the last octet.

4
00:00:30,010 --> 00:00:37,420
So to work out the first host you simply add one to the subnet portion subnet portion is 64.

5
00:00:37,510 --> 00:00:40,880
So 1 added to that is 65.

6
00:00:41,050 --> 00:00:44,830
The next subnet is 128.

7
00:00:44,830 --> 00:00:49,300
So going back to our original example this is the second subnet.

8
00:00:49,300 --> 00:00:52,890
This is the third subnet 128.

9
00:00:52,940 --> 00:00:59,320
That means that the broadcast for the subnet is 127 because 128 minus one equals 127.

10
00:00:59,770 --> 00:01:09,940
This is the next subnet minus one gives us our broadcast for the current subnet lost IP address in the

11
00:01:09,940 --> 00:01:11,820
subnet is 126.

12
00:01:11,830 --> 00:01:13,990
Next one is 125.

13
00:01:13,990 --> 00:01:17,220
Next one is 124.

14
00:01:17,260 --> 00:01:24,360
So there is our subnet broadcast for second lost host and third lost host.

15
00:01:24,400 --> 00:01:26,230
I haven't rechecked the binary.

16
00:01:26,230 --> 00:01:28,280
You could do that if you wanted to.

17
00:01:28,300 --> 00:01:34,450
I'm simply using a quick method to work out the IP addresses so this road needs to be configured with

18
00:01:34,450 --> 00:01:47,440
the first ip address on the serial interface so interface serial 0 1 0 no shut IP address 1 9 2 1 6

19
00:01:47,440 --> 00:01:53,670
8 165 uses that subnet mosque.

20
00:01:53,770 --> 00:02:01,420
So again it's just one more than the broadcast address show IP interface brief there's the IP address

21
00:02:01,450 --> 00:02:11,920
on the serial interface on the Internet router we need to use one less than the next subnet 127 show

22
00:02:11,920 --> 00:02:23,160
IP interface brief on the first serial interface interface serial 0 1 0 no shut IP address 1 9 2 1 6

23
00:02:23,160 --> 00:02:36,440
8 1 1 26 with the subnet mask 127 is the broadcast one less than that gives us a lost IP address so

24
00:02:36,440 --> 00:02:40,880
can we paying 1 9 2 1 6 8 1 sixty five yes we can.

25
00:02:41,150 --> 00:02:42,760
So that's great.

26
00:02:42,920 --> 00:02:51,230
We have IP connectivity between this router and the Internet router and notice and 0 SPF neighbour relationship

27
00:02:51,230 --> 00:02:58,910
has come up the rods were pre configured with arrays P.F. so hopefully this Roddick can now ping the

28
00:02:58,910 --> 00:03:10,070
DNS server on the Internet and notice it can on P.S. 1 can it ping the DNS server yes it can.

29
00:03:10,310 --> 00:03:20,990
If I trace to the DNS server traffic is going to write a one on the Ethan it interface then it's going

30
00:03:20,990 --> 00:03:25,580
to the Internet writer on the serial interface then to the Internet.

31
00:03:25,580 --> 00:03:33,500
The reason it works is this writer has been pre configured with 0 SPF but is also being pre configured

32
00:03:33,500 --> 00:03:40,910
with Network Address Translation The slave is concentrating on subletting so I pre configured the net

33
00:03:41,030 --> 00:03:45,760
and writing protocols so that you didn't have to worry about that.

34
00:03:45,860 --> 00:03:47,660
Can we get to Cisco dot com.

35
00:03:47,810 --> 00:03:49,130
Yes We Can.

36
00:03:49,130 --> 00:03:51,040
Can we get to Facebook.

37
00:03:51,080 --> 00:03:54,020
Dot com yes we can.

38
00:03:54,050 --> 00:03:56,610
So that works on P.C. zero.

39
00:03:56,630 --> 00:04:01,360
What about P.C. to can we get to Cisco dot com.

40
00:04:01,370 --> 00:04:02,750
Yes we can.

41
00:04:02,750 --> 00:04:05,060
Can we get to Facebook dot com.

42
00:04:05,090 --> 00:04:06,810
Yes we can.

43
00:04:06,810 --> 00:04:13,010
So I'm hoping and radiate to this point you've learnt a lot about IP addressing subheading how to configure

44
00:04:13,010 --> 00:04:17,990
it and how to make it practical in a network in the next video.

45
00:04:17,990 --> 00:04:24,170
I'm just going to continue doing something very similar for the other subnets and I'm going to speed

46
00:04:24,170 --> 00:04:27,020
it up by using tricks rather than binary.