Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated:
1
00:00:05,980 --> 00:00:07,180
What is DNS?
2
00:00:09,060 --> 00:00:14,250
Due to the proliferation of the internet, browsing to websites from our computers, phones or tablets
3
00:00:14,610 --> 00:00:16,650
is now an integral part of our daily lives.
4
00:00:16,950 --> 00:00:22,440
And all it involves is typing the right benign name into our browser for easy shopping.
5
00:00:22,860 --> 00:00:31,800
We browse to sites like W-, W- W-, Amazon.com or WW Dot eBay.com for online banking.
6
00:00:32,160 --> 00:00:39,090
We navigate the websites such as W, WW Dot, Bank of America Dot Com, and to watch some of the latest
7
00:00:39,090 --> 00:00:43,200
movies we visit the likes of WW W Dot Netflix dot com.
8
00:00:44,110 --> 00:00:49,120
The entire experience of surfing the Web basically involves browsing two domain names, such as the
9
00:00:49,120 --> 00:00:52,450
ones mentioned as they are easy for us humans to remember.
10
00:00:55,180 --> 00:01:01,480
The problem is, however, that unlike humans, computers work with numbers since each device connected
11
00:01:01,480 --> 00:01:06,130
to the internet has a unique IP address, which other machines use to find it.
12
00:01:06,580 --> 00:01:11,860
What this means is that though we can browse the website by typing its IP address in our browser, we
13
00:01:11,860 --> 00:01:19,000
cannot do the same with domain names unless we use a specific supporting mechanism designed to translate
14
00:01:19,000 --> 00:01:20,710
domain names to IP addresses.
15
00:01:21,880 --> 00:01:23,410
And this is where DNS comes in.
16
00:01:24,160 --> 00:01:29,980
DNS stands for domain name system, and it is the underlying protocol that acts as the intermediary,
17
00:01:30,340 --> 00:01:37,150
allowing for the translation of domain names such as WW W Dot, BBC Decoder UK to the IP address or
18
00:01:37,150 --> 00:01:43,510
addresses that belong to the computer system hosting the actual contents that we as the end users want
19
00:01:43,510 --> 00:01:44,160
to access.
20
00:01:45,780 --> 00:01:51,900
This is why dance is often referred to as the phone book of the internet, in that it works in a very
21
00:01:51,900 --> 00:01:58,170
similar way to a conventional phone book where we perform a lookup against the name with a goal to get
22
00:01:58,170 --> 00:02:00,210
its associated numeric address.
23
00:02:00,600 --> 00:02:05,940
In other words, VNS makes the link between the action of typing a domain name into a browser and reaching
24
00:02:05,940 --> 00:02:11,310
the computer system, which hosts the desired content without DNS.
25
00:02:11,610 --> 00:02:18,730
We would need to know the IP address of the site we wish to browse to, such as 0:55, though 23 eight
26
00:02:18,750 --> 00:02:19,140
nine.
27
00:02:19,320 --> 00:02:26,100
If it's an IP before address or more complex alphanumeric IP addresses such as two four zero zero column
28
00:02:26,280 --> 00:02:36,810
C. B. zero zero column two zero four eight column one column column C six to nine column D7 A2 if it's
29
00:02:36,810 --> 00:02:37,770
an IP address.
30
00:02:38,370 --> 00:02:42,510
Needless to say, this is not practical at all, even for technical individuals.
31
00:02:42,750 --> 00:02:49,290
And so DNS has been created with the aim of eliminating the need for humans to memorize IP addresses
32
00:02:49,290 --> 00:02:52,830
and instead use human friendly domain names while browsing.
33
00:02:54,320 --> 00:03:00,590
In summary, without DNS, we will not be able to use the internet as we do today without being said,
34
00:03:00,920 --> 00:03:07,400
DNS is a lot more complicated than a phone book, and its versatility has gone beyond the task of translating
35
00:03:07,400 --> 00:03:08,900
domain names to IP addresses.
36
00:03:09,290 --> 00:03:14,000
The protocol steps and sophistication would become more apparent as we progressed through the course.
37
00:03:14,970 --> 00:03:19,410
I would love to take a moment to thank you again for running this course designed to teach you everything
38
00:03:19,410 --> 00:03:24,240
you need to know about one of the most important internet protocols out there, taking you from the
39
00:03:24,240 --> 00:03:25,770
status of newbie to expert.
40
00:03:25,800 --> 00:03:26,520
Along the way.
4481
Can't find what you're looking for?
Get subtitles in any language from opensubtitles.com, and translate them here.