GlowTouch Technologies
10+ Refrotech Interview Questions and Answers
Q1. Mail entire process. Browsing entire process of interconnection.
The mail process involves multiple steps including sending, routing, and delivery.
Sender composes and sends email
Email is routed through servers and networks
Recipient's email server receives and stores email
Recipient accesses email through client software
Q2. What is difference between http and https
HTTP is unsecured protocol while HTTPS is secured protocol using SSL/TLS encryption.
HTTP stands for Hypertext Transfer Protocol, while HTTPS stands for Hypertext Transfer Protocol Secure.
HTTP operates on port 80, while HTTPS operates on port 443.
HTTPS uses SSL/TLS certificates to encrypt data transmitted over the network, providing a secure connection.
HTTPS is used for secure communication over the internet, such as online banking, e-commerce websites, etc.
Q3. HTTP protocol how does it works
HTTP protocol is a set of rules for transferring data over the internet.
HTTP is a stateless protocol, meaning each request is independent of the others.
It uses methods like GET, POST, PUT, DELETE to communicate between clients and servers.
Headers are used to provide additional information about the request or response.
Status codes like 200, 404, 500 indicate the success or failure of a request.
HTTP/1.1 is the most widely used version of the protocol.
Q4. What is CDN ?
CDN stands for Content Delivery Network, a system of distributed servers that deliver web content to users based on their geographic location.
CDNs help improve website performance by reducing latency and increasing loading speeds.
They cache content on servers located closer to users, reducing the distance data needs to travel.
Popular CDN providers include Akamai, Cloudflare, and Amazon CloudFront.
Q5. IP address,types, how to find them in PC
IP addresses are unique identifiers assigned to devices on a network. They can be IPv4 or IPv6.
There are two types of IP addresses: IPv4 and IPv6.
IPv4 addresses are 32-bit numerical addresses, typically written in decimal format (e.g. 192.168.1.1).
IPv6 addresses are 128-bit hexadecimal addresses, written in a format like 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
To find IP addresses on a PC, you can use the 'ipconfig' command in the command prompt (for Windows) or 'ifconfig' co...read more
Q6. What is a webpage
A webpage is a document or resource on the internet that is typically written in HTML and can contain text, images, videos, links, and other multimedia elements.
A webpage is accessed through a web browser like Chrome, Firefox, or Safari
It is usually identified by a unique URL (Uniform Resource Locator)
Webpages can be static (unchanging) or dynamic (changing based on user input or other factors)
Examples of webpages include Google's homepage, Wikipedia articles, and online shop...read more
Q7. What's cache, cookies?
Cache and cookies are temporary storage mechanisms used by web browsers to improve user experience and website performance.
Cache is a temporary storage location on a computer or device where recently accessed data is stored for quick retrieval.
Cookies are small pieces of data stored on a user's computer by websites to remember user preferences, login information, and other browsing history.
Cache helps to speed up website loading times by storing frequently accessed data local...read more
Q8. What are the web hosting types
Web hosting types include shared hosting, VPS hosting, dedicated hosting, and cloud hosting.
Shared hosting: multiple websites share a single server
VPS hosting: virtual private server with dedicated resources
Dedicated hosting: entire server dedicated to one website
Cloud hosting: resources are spread across multiple servers
Q9. What's HTML,CSS,XML. Just a definition.
HTML, CSS, and XML are markup languages used for creating and styling web pages.
HTML stands for HyperText Markup Language and is used for creating the structure of web pages.
CSS stands for Cascading Style Sheets and is used for styling the appearance of web pages.
XML stands for eXtensible Markup Language and is used for storing and transporting data.
HTML and XML are markup languages, while CSS is a style sheet language.
Example: <html><head><title>Example</title></head><body><...read more
Q10. What is Domain name system
Domain Name System (DNS) is a system that translates domain names to IP addresses to locate resources on the internet.
DNS is like a phone book for the internet, translating human-readable domain names (e.g. google.com) to machine-readable IP addresses (e.g. 172.217.7.238).
DNS helps in locating websites, email servers, and other resources on the internet.
DNS operates through a distributed database system, with multiple servers around the world storing domain name and IP addres...read more
Q11. What is internet
The internet is a global network of interconnected computers that allows for communication, information sharing, and access to resources.
Global network of interconnected computers
Allows for communication, information sharing, and resource access
Uses protocols like HTTP, FTP, and TCP/IP
Examples: websites, email, online videos
Q12. What is hotlink protection.
Hotlink protection is a security measure used to prevent other websites from directly linking to your website's images or files.
Hotlink protection works by checking the referrer of requests for images or files, and only allowing access if the referrer is from an approved domain.
It helps prevent bandwidth theft and reduces server load by only serving content to legitimate users.
Common methods of implementing hotlink protection include using .htaccess files or server-side scrip...read more
Q13. How does dns work
DNS translates domain names to IP addresses to locate resources on the internet.
DNS stands for Domain Name System
It works by translating human-readable domain names (like www.google.com) into IP addresses (like 172.217.3.100)
DNS servers store records of domain names and their corresponding IP addresses
When you type a domain name into a browser, your computer queries a DNS server to find the corresponding IP address
DNS uses a hierarchical system with root servers at the top, f...read more
Q14. What is web hosting
Web hosting is a service that allows individuals and organizations to make their website accessible via the World Wide Web.
Web hosting providers store website files on servers
Websites are hosted on servers connected to the internet
Different types of web hosting include shared, VPS, dedicated, and cloud hosting
Q15. Full form of DSA
Data Structures and Algorithms
DSA stands for Data Structures and Algorithms
It is a fundamental concept in computer science
Understanding DSA is crucial for efficient problem-solving in programming
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