Domain Name System

Domain Name System (DNS) is an application layer protocol typically used to translate domain names or hostnames into IP addresses and vice versa. Furthermore, DNS is a decentralized naming system that translates or maps human-readable domain names to their corresponding IP addresses and back. DNS is important component that facilitates the ability to scale networking architectures efficiently and effectively.

All computer systems on the Internet find and communicate with one another through numeric values known as IP addresses. And it is sometimes dubbed as the phonebook of the Internet by computer scientists. Moreover, web browsers establish sessions with computer resources deployed somewhere in cloud environments and on-premise datacenters through IP address. Besides, DNS translates hostnames to IP addresses so that the browsers can retrieve and load the resources hosted on the Internet. In addition, each device connected to the Internet possesses a unique IP address so that other machines can use it to find the device to transfer resources across the platforms. Furthermore, DNS servers eliminate the need for humans to memorize IP addresses (IPv4) or more complex newer alphanumeric IP addresses (IPv6).

There are four DNS servers that are employed in loading a webpage hosted somewhere in the clouds or datacenters.

• DNS Recursor: a server that responds to a recursive request from a client workstation and takes the time locate the DNS record.
• Root Nameserver: the first step in mapping human readable hostnames into IP addresses.
• TLD (Top Level Domain) Nameserver: The next step in the search of a specific IP address and it contains the last portion of the hostname.
• Authoritative Nameserver: a server that actually holds DNS resource records

There are three types of DNS queries, namely:

• Recursive query: a DNS client requires that a DNS server will respond to the client with either the requested resource record or an error message if the resolver cannot find the record.
• Iterative query: a DNS client will allow a DNS server to return the best answer it can retrieve.
• Non-recursive query: occurs when a DNS resolver client queries a DNS server for a resource record that it has access to either because it is authoritative for the records or the records that exist inside of its cache.

HP Elite Desktop PC Computer | Intel Quad-Core i5 | 8GB Ram | 1TB HDD | 24 Inch LCD Monitor (1080p HDMI), RGB Keyboard + Mouse | Desk Speakers | WiFi + Bluetooth | Windows 10 (Renewed)

(738)

11% Off $156.00 $139.00 (as of 07/07/2024 16:40 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

[INTEL POWERED MULTI-TASKING] - Built with a quad-core Intel i5 processor and 8GB of DDR3 RAM; Perfect as a home office computer, remote learning, or media center [LATEST WIRELESS TECH] - This HP Desktop Computer easily connects to the internet throu... read more

Hiearcool USB C Hub, USB C Multi-Port Adapter for MacBook Pro, 7IN1 USB C to HDMI Hub Dongle Compatible for USB C Laptops and Other Type C Devices (4K HDMI USB3.0 SD/TF Card Reader 100W PD)

(48391)

8% Off $24.99 $22.99 (as of 07/07/2024 16:54 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

UL/SGS Approved Hiearcool USB C Hub: The intelligent USB C Adapter has perfectly combined all the functions you need. USB C to HDMI hub equipped with USB3.0 x2, 4K@30 HDMI, SD/TF Card Adapter, and Up to 100W/20V/5A Type C Power Delivery charging port... read more

Laptop Cleaning Kit Keyboard Cleaner, Keyboard Cleaning Kit Electronics Cleaning Tool for MacBook iPad Phone iPhone Pro, Brush Tool for Tablet, Computer, PC, TV Camera Lens Computer Vacuum Keyboard

(2067)

$16.98 (as of 07/07/2024 17:06 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

DEEP CLEAN YOUR DEVICE The electronics cleaner kit can effectively deep clean all your electronic devices such as mobile phones, tablets, TVs, etc. It comes with retractable large keyboard brush, polishing cleaning cloth X 2, keycap puller, metal pen... read more

PC Gaming Headset Headphone Hook Holder Hanger Mount, Headphones Stand with Adjustable & Rotating Arm Clamp, Under Desk Design, Universal Fit, Built in Cable Clip Organizer EURPMASK

(27367)

$12.99 (as of 07/07/2024 16:54 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

🎧【Clamp-on Headphone Stand】The E-Hold Series headphone holder fits desks from 0.31 inch to 1.57 inch thick, making it a versatile choice for most setups. The spring clamp is a breeze to remove and reattach. No glue, no mess. It blends seamlessly into... read more