What is DNS, basic knowledge of DNS

What is DNS, basic knowledge of DNS


If you study information technology, you must have heard about the concept of DNS once, right? Usually we only know DNS is a long number without understanding the meaning and its real effect like? The content below, Taimienphi will share with you the basics of DNS.

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DNS is a protocol of computer networks. The primary job of DNS is to “turn” a user-friendly domain name, such as “howstuffworks.com“to an IP address, for example 70.42.251.42 that computers use to identify each other on the network. DNS can be compared to the GPS of a computer on the Internet.

dns is the real thing that you have about dns

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 is like how you dial a phone number to connect with the person you want to call and talk to.

Thanks to the fastest and useful DNS usage, users don’t need to keep a list of their own IP addresses. Instead just connect through that fastest DNS, Domain Name System or Name Servers, manage a huge database maps domain names to IP addresses.

Whether you are visiting a website or sending an email, your computer uses a DNS server to find the domain name you are trying to access. The “standard” term for this process is DNS name resolution, and it’s not wrong to say that the DNS server resolves the domain name for the IP address.

For example, when you type http://www.howstuffworks.com in any browser address bar on your computer, part of the network connection includes resolving the domain name “howstuffworks.com” 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. Additionally, the IP address of a website can change at any time, and some websites combine multiple IP addresses with a single domain name.

Without a DNS server (DNS server), the Internet “closes” very quickly. Typically, when connecting to a Home Network, Internet Service Provider (ISP) or WiFi, modem or Router (router) will assign your computer’s 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 compiling DNS names to IP addresses.

By now, you must have grasped some basic knowledge of DNS. To dig deeper, let’s see the IP address structure and how important it is to the domain name resolution process in the next section below.

DNS Servers and IP addresses

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

Billions of IP addresses are in use.
DNS servers are handling “billions” of requests on the Internet at any given moment.
Millions of people are adding and changing domain names and IP addresses every day.

To solve these 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 the IANA (Internet Assigned Numbers Authority).

Here are some ways to identify an IP address:

– 1 IPV4 address has 4 groups separated by dots will be ABCD Such as: 70.74.251.42
– 1 IPV6 address has 8 groups, each group of 16 bits is represented as a hexadecimal number (Hexa-Decimal) and separated by a colon. For example, 2001: 0cb8: 85a3: 0000: 0000: 8a2e: 0370: 7334.

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

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

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

Some addresses and ranges of addresses are designated 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, maybe the address is coming from a DHCP (Dynamic Host Configuration Protocol) server on your network.

The primary job of a DHCP server is to make sure your computer has the IP address and some other network configuration it needs whenever you’re online. Since this is a dynamic address, the IP address on your computer may change.

Web servers and other computers need a consistent point of contact 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 (Media Access Control) address on the network interface. Each network interface, both wired and wireless, has a unique MAC address embedded by the manufacturer.

How to find the IP address

Here are a few 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 enter the command ipconfig go there.

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

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

On smart phones using Wifi : Look for the IP address on the network setup page. Each phone model has different methods of accessing and checking network settings.

Surely you have 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 to be a good network administrator, you need to know all of them, and the concept of ISP is one of them, if you do not know what an ISP is? refer to the article mentioned What is an ISP by Taimienphi to add knowledge for me.

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. differences between DNS and NetBIOS to broaden their knowledge.

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