What is DNS, basic knowledge of DNS

What is DNS, basic knowledge of DNS


If you study information technology, surely you have heard about the concept of DNS, right? Usually we only know DNS is a long series of numbers but do not understand the meaning and its true effect like? Content below, Taimienphi will share with you the basic knowledge about DNS.


DNS is a computer network protocol. The basic task of DNS is to “turn” a user-friendly domain name, such as “howstuffworks.com“into an IP address, such as 70.42.251.42 that computers use to identify each other on the network. Maybe a DNS wallet is like a GPS of a computer on the Internet.

Computers and other networked devices on the Internet use IP addresses to “route” a user’s request to the website they are trying to access. In a nutshell, it’s the same way you dial a phone number to connect with the person you want to talk to.

Thanks to the fastest and useful way to use DNS, users do not need to save a list of their own IP addresses. Instead, just connect via the fastest DNS, Domain Name System or Name Servers. A huge database of domain names (maps) to IP addresses.

Whether you are visiting a website or sending an email, your computer will use a DNS server to look up the domain name you are trying to access. The “most standard” term for this process is DNS name resolution, and it is not wrong to say that the DNS server resolves domain names for IP addresses.

For example, when you enter http://www.howstuffworks.com into the address bar of any browser on your computer, part of the network connection includes the process of resolving the “howstuffworks.com” domain into an address. IP, such as 70.42.251.42 for HowStuffWorks’ web server (Web Server).

If you want to bypass DNS Lookup, just enter it directly 70.42.251.42 into your browser. In addition, the IP address of a website may change at any time, and some websites associate multiple IP addresses with a unique domain name.

Without a DNS server, the Internet will “shut down” very quickly. Normally, when connected to a Home Network, an Internet service provider (ISP) or a WiFi, modem or Router (router) will assign your computer network address and send some important network configuration information to your computer or mobile device. That configuration includes one or more DNS servers that the device uses when translating DNS server names (DNS names) into IP addresses.

By now, you should have mastered some basic knowledge about DNS. To learn more, let’s look at the IP address structure and how important it is for domain name resolution in the next section.

DNS Servers and IP addresses

As mentioned above, the primary task of a DNS (Domain Name Server) is to resolve (or in other words, compile) a domain name into an IP address. This sounds simple but in reality it is not simple at all. The reason is because:

– There are billions of IP addresses being used.
– DNS servers are processing “billions” of requests on the Internet at any given time.
– Every day millions of people are adding and changing domain names and IP addresses.

To solve the problems, DNS servers rely on network performance and Internet protocols. For IP addresses, every computer on the Internet has a unique IP address (including IPV4 and IPV6 standards) managed by IANA (Internet Assigned Numbers Authority).

Here are some ways to identify IP addresses:

– 1 IPV4 address has 4 groups separated by a periodic order will be A.B.C.D. Such as: 70.74.251.42
– 1 IPV6 address has 8 groups, each group of 16 bits is represented as hexadecimal numbers (Hexa-Decimal) and separated by colons. For example, 2001: 0cb8: 85a3: 0000: 0000: 8a2e: 0370: 7334.

However, IPV6 is a very new standard, so in this article Free Download will focus on the more popular IPV4 standard.

Each number in the IPV4 address group is called “Octet”, each octet has 8 bits, equivalent to 1 byte.

For example, Octet is written as 42, which stands for 00101010. Each digit in a binary number is a placeholder for a 2-digit number from 2 to 27, reading right to left. This means that in 00101010, you have a number 21, 23, and 25. So, to get the base base equivalent to -10, just add 21 + 23 + 25 = 2 + 8 + 32 = 42.

Some addresses and address ranges are assigned by IANA as private IP addresses. For example, the IP address 127.0.0.1 is used exclusively to identify the computer you are using.

Where does the computer’s IP address come from? If you’re talking about a computer or laptop, the address may come from a DHCP server (Dynamic Host Configuration Protocol) on your network.

The main task of a DHCP server is to make sure your computer has the IP address and some other network configuration it needs whenever you are online. Because this is a dynamic address, the IP address on your computer may change.

Web servers and other computers need a consistent contact point using static IP addresses. This means that the same IP address is always assigned to the network interface when online.

To ensure the interface always receives an IP address, the IP associates the address with the MAC address (Media Access Control) on the network interface. Each network interface, including wired and wireless networks, has a unique MAC address embedded by the manufacturer.

How to find the IP address

Here are some ways to find out the IP address on your computer. Note that the IP address may change periodically unless you use a static IP address.

Windows : The fastest way to find the IP address on a Windows computer is to open a Command Prompt window, then type the command ipconfig go there.

Mac : Open System Preferences, then click Network make sure your current network connection (with a green dot next to it) is selected, then click Advanced then click the tab TCP / IP .

Linux or UNIX : Open a Terminal application, such as XTERM or iTerm, then enter the command ifconfig go there.

On smartphones using Wifi : Search for an IP address on the network settings page. Each phone line will have different ways to access and check network settings.

Surely you’ve heard the concept of changing DNS to access blocked websites, right, changing DNS is quite simple, does not take much of your time, but helps to access blocked websites.

Computer networks have many different concepts, and in order to be a good network administrator, you need to know all those concepts, and the concept of ISP is one of them, if you don’t know what ISP is? refer to the article mentioned What is an ISP Taimienphi’s to supplement their knowledge.

https://thuthuat.taimienphi.vn/dns-la-gi-kien-thuc-co-ban-ve-dns-23682n.aspx
DNS and NetBIOS are both important components of a user’s computer, to see the pros and cons of these two concepts, you can follow the article. Difference between DNS and NetBIOS to further expand my knowledge.

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