1
00:00:00,420 --> 00:00:08,250
Now, let us begin to an interesting lecture on a wide area network now, when most of the people are

2
00:00:08,250 --> 00:00:14,910
asked to define the wide area network, some of them might say it's a network covering a large geographical

3
00:00:14,910 --> 00:00:16,140
area, which is correct.

4
00:00:16,410 --> 00:00:20,110
And the rest of the people just come up with a quick answer.

5
00:00:20,250 --> 00:00:21,210
That is the Internet.

6
00:00:21,610 --> 00:00:29,950
Well, the right wide area network spans a larger geographical area as compared to the local area network.

7
00:00:30,960 --> 00:00:39,300
With that in mind, you can imagine that wide area networks are what we use to span a great larger geographic

8
00:00:39,300 --> 00:00:43,860
areas like two countries, five countries or even the entire world.

9
00:00:44,700 --> 00:00:50,600
Like the Internet ones usually employ both routers and public links.

10
00:00:51,060 --> 00:00:54,930
So that's generally the criteria that is used to define them.

11
00:00:55,800 --> 00:01:03,420
Now, let us have a look at some important ways that wide area networks are different from local area

12
00:01:03,420 --> 00:01:04,110
networks.

13
00:01:06,310 --> 00:01:13,780
Now, vans usually need a router, boat or boats, with that in mind, we are going to see our routers

14
00:01:13,780 --> 00:01:17,920
and ports in our upcoming next video sections.

15
00:01:19,390 --> 00:01:30,160
Then wide area networks span larger geographic areas and they can link to disparate locations, wide

16
00:01:30,160 --> 00:01:37,570
area networks are usually slower than local area networks, and we can choose when and how long we can

17
00:01:37,570 --> 00:01:38,650
connect to a while.

18
00:01:40,240 --> 00:01:48,930
Then we can utilize either private or public transport in white area network mechanism, for example,

19
00:01:49,030 --> 00:01:49,880
phone lines.

20
00:01:51,220 --> 00:01:59,680
Now, we all know that we get the wall Internet from the Internet and in the network is a type of plan

21
00:02:00,100 --> 00:02:07,330
that is a local area network or it is a type of wide area network that connects a bunch of networks

22
00:02:07,330 --> 00:02:08,530
or intranets.

23
00:02:09,410 --> 00:02:16,480
We all know that when we connect to multiple local area networks, it forms of wide area network and

24
00:02:16,480 --> 00:02:20,830
then into network hosts still use hardware addresses.

25
00:02:21,040 --> 00:02:27,140
That is the Mac addresses to communicate with other hosts on the local area network.

26
00:02:28,000 --> 00:02:36,310
However, they use logical addresses that is IP addresses to communicate with hosts on different local

27
00:02:36,310 --> 00:02:37,300
area networks.

28
00:02:38,230 --> 00:02:41,320
Routers are the devices that make this possible.

29
00:02:41,710 --> 00:02:46,360
Now each connection into a router is a different logical network.

30
00:02:46,660 --> 00:02:48,370
As you can see on the screen.

31
00:02:48,640 --> 00:02:56,430
Router one of Branch one and router two of Branch two is connected to the Internet and therefore the

32
00:02:56,590 --> 00:02:57,220
host.

33
00:02:57,220 --> 00:03:05,140
That is the box that can access information from the servers in this way, one that is a wide area network

34
00:03:05,290 --> 00:03:07,230
is utilized by everyone.

35
00:03:08,350 --> 00:03:14,060
The Internet is a prime example of what's known as a distributed wide area network.

36
00:03:14,620 --> 00:03:17,030
So what is a distributor wide area network?

37
00:03:17,740 --> 00:03:24,610
It is an Internet work that's made up of a lot of interconnected computers located in a lot of different

38
00:03:24,610 --> 00:03:25,360
places.

39
00:03:26,890 --> 00:03:35,710
Switching on to the next concept that is multi protocol label switching now and business will be clearly

40
00:03:35,710 --> 00:03:39,100
defined in Section 60 and you don't have to worry about that.

41
00:03:39,430 --> 00:03:46,900
But for this section, I'm just giving you a brief introduction of what is mean by multiple Tocal label

42
00:03:46,910 --> 00:03:47,400
switching.

43
00:03:48,040 --> 00:03:55,120
Now, it is not a service provider by any of the devices or any of the layers, but it is a technique

44
00:03:55,120 --> 00:03:59,950
that is used to forward data to different multiple destinations.

45
00:04:00,770 --> 00:04:03,850
Now, what is exactly in place now?

46
00:04:03,850 --> 00:04:10,600
I would like to read the technical definition and then I would explain in simple words, using a real

47
00:04:10,600 --> 00:04:11,370
life example.

48
00:04:11,710 --> 00:04:20,410
So the definition goes like this and peerlessly the switching mechanism that imposes labels to the data

49
00:04:20,530 --> 00:04:26,980
and then uses these labels to forward the data when it arrives at the network.

50
00:04:27,580 --> 00:04:28,670
Now, what does that mean?

51
00:04:29,200 --> 00:04:29,800
Don't worry.

52
00:04:30,100 --> 00:04:31,420
Consider this example.

53
00:04:31,780 --> 00:04:35,880
You're ordering a stuff from Amazon and from the center.

54
00:04:35,880 --> 00:04:37,000
From the data center.

55
00:04:37,450 --> 00:04:38,410
From the service center.

56
00:04:38,410 --> 00:04:40,690
They have sent that packaged box.

57
00:04:40,870 --> 00:04:43,220
They want to deliver that box to your house.

58
00:04:43,870 --> 00:04:44,680
So what do they do?

59
00:04:44,740 --> 00:04:45,970
Do they just give you a name?

60
00:04:46,360 --> 00:04:49,090
No, they give an address.

61
00:04:49,090 --> 00:04:57,790
They give an idea, a bar code or a QR code, so that whenever the packet reaches different destinations,

62
00:04:57,790 --> 00:05:04,870
for example, you are you have ordered something from California and you want and you are located in

63
00:05:04,870 --> 00:05:05,480
Boston.

64
00:05:05,650 --> 00:05:09,840
So from California to Boston, you want your package delivered.

65
00:05:10,330 --> 00:05:13,980
So the package will arrive at multiple locations in between.

66
00:05:13,990 --> 00:05:18,820
It may arrive at Texas and South Carolina, then New York and then Boston.

67
00:05:19,510 --> 00:05:27,940
So at this point, they scan the QR code and then they calculate the next top or the next destination.

68
00:05:28,450 --> 00:05:36,010
In similar way, whenever a data is to be transferred through a network, the labels are imposed on

69
00:05:36,010 --> 00:05:40,810
that data packet and then accordingly that data is transferred.

70
00:05:41,440 --> 00:05:47,000
So this is all about multi protocol label switching in this section.

71
00:05:47,020 --> 00:05:52,570
I just wanted to give you a small introduction of the topic button Section 16.

72
00:05:52,810 --> 00:05:56,290
We learn more about multi protocol label switching.

73
00:05:57,280 --> 00:06:04,330
Now, in the next lecture, we are going to talk about peer to peer and client server architecture.

74
00:06:04,690 --> 00:06:10,720
You might have heard these words frequently used by I.T. professionals, but in the next lecture, I

75
00:06:10,720 --> 00:06:16,960
will give you a brief introduction and I will also explain the characteristics of both types of network

76
00:06:16,960 --> 00:06:17,770
architectures.