1
00:00:08,860 --> 00:00:20,110
This typology if PC one sends a broadcast way will it go so what will happen if we put this PC into

2
00:00:20,110 --> 00:00:27,180
a separate Villon will broadcast be forwarded out of this port and this port.

3
00:00:27,300 --> 00:00:30,610
So which one has no configuration at the moment.

4
00:00:30,620 --> 00:00:38,880
So show MAC Address table we can see that a source MAC address was lent on could give it to 0 1 and

5
00:00:38,880 --> 00:00:41,450
this MAC address was learnt on gigabit 00.

6
00:00:41,460 --> 00:00:48,630
In other words the switch to back to the router as well as the ostinato device sending synthetic or

7
00:00:49,020 --> 00:00:58,950
generated frames show Villon brief at the moment we only have the default villans gigabit 0 1 belongs

8
00:00:58,950 --> 00:01:00,490
to villaine one.

9
00:01:00,720 --> 00:01:10,380
So create a villain to and then go on to give it to 0 1 and top switch port access a villain to to put

10
00:01:10,530 --> 00:01:16,260
that port into villain to show interface gigabit zero or one switch port.

11
00:01:16,260 --> 00:01:19,550
This port is now in the land too.

12
00:01:19,580 --> 00:01:23,870
We have moved to the PC into a separate LAN.

13
00:01:23,970 --> 00:01:28,560
So what I'll do is stop Austria Nada and then started again.

14
00:01:28,560 --> 00:01:30,700
So we're still generating frames.

15
00:01:30,960 --> 00:01:34,170
These are broadcast frames that are being generated.

16
00:01:34,380 --> 00:01:41,810
Do we see any traffic on that interface no broadcasts to being received on the interface.

17
00:01:43,070 --> 00:01:47,310
What about the interface.

18
00:01:47,420 --> 00:01:54,510
Again no broadcasts from the PC are being received even though the PC is sending the broadcasts

19
00:01:57,290 --> 00:02:04,430
because the switch has been configured with villans broadcasts received on this interface are not forwarded

20
00:02:04,790 --> 00:02:10,840
out of gigabit to 0 2 0 0 0 because they are in separate villans.

21
00:02:11,150 --> 00:02:19,330
But if we configured gigabit 00 as a trunk so we use the command switch port trunk encapsulation daat

22
00:02:19,340 --> 00:02:22,770
one key switch port mode trunk.

23
00:02:22,820 --> 00:02:27,830
What would happen now would broadcast be forwarded on that port.

24
00:02:28,040 --> 00:02:38,370
So show interface could give it to 00 switch port it's configured for trunking.

25
00:02:38,760 --> 00:02:40,790
It's operating as a trunk.

26
00:02:40,800 --> 00:02:44,560
We can see that by tapping show interface trunk.

27
00:02:44,970 --> 00:02:53,990
So gigabit 00 has been manually configured as a trunk would broadcast before it across that port.

28
00:02:54,000 --> 00:03:04,380
So this is the why shock capture on could give it a 0 0 0 from the switch to give it as 0 0 on the router.

29
00:03:04,500 --> 00:03:13,140
And as you can see broadcast frames are being sent they are being put in TV land too.

30
00:03:13,180 --> 00:03:22,120
In other words they are tagged with added to the one Q tag too because the traffic was sent on a port

31
00:03:22,150 --> 00:03:23,740
in the land too.

32
00:03:23,740 --> 00:03:27,440
So this port is an Access Port Vila and to them this is a trunk port.

33
00:03:27,620 --> 00:03:34,640
So on the trunk port they are tagged with the land too but broadcasts are being forwarded to the router.

34
00:03:35,020 --> 00:03:38,990
The router however will not forward those broadcasts on.

35
00:03:39,010 --> 00:03:45,560
So even if we can figure out the router as a rod on the stick it would still not forward the frame's.

36
00:03:45,580 --> 00:03:54,490
So at the moment if it is 0 0 is configured with an IP address but even if we get the following and

37
00:03:54,490 --> 00:04:00,010
topped encapsulation top 1 Q and specified violent to

38
00:04:03,490 --> 00:04:11,720
broadcast would not be received by the router but the router would not forward them on even if we configured

39
00:04:13,940 --> 00:04:23,170
an IP address of let's say 10 1 20 to 5 4 on that interface because routers don't forward broadcasts

40
00:04:23,180 --> 00:04:24,870
by default.

41
00:04:24,950 --> 00:04:33,900
So I've got this IP address configured on gigabit to 0 0 2 but if we do a capture on this interface

42
00:04:36,910 --> 00:04:44,110
what you'll notice is no broadcasts are being forwarded on because road block broadcasts by default

43
00:04:44,830 --> 00:04:50,170
have be found to this very useful if it's been of benefit to you please like it and please subscribe

44
00:04:50,170 --> 00:04:51,450
to my YouTube channel.

45
00:04:51,700 --> 00:04:54,060
I wish you all the very best.
