DNS Cache

Summary

The script explains the concept of a 'DNS Cache,' a hidden treasure of information on websites visited, which enhances internet navigation speed and efficiency. When visiting a site for the first time, a DNS request is sent, and the server responds with the corresponding IP address. Subsequent visits are faster as the browser checks the local DNS cache before making a new request. This cache is a valuable resource that, while not making us rich, significantly improves our internet experience by saving time on searching.

Takeaways

• 💡 Every computer has a cache, which is a storage of information about websites visited, not a treasure that improves the state of the browser.
• 🔍 When visiting a website for the first time, the browser sends a DNS request, and the DNS server responds with an appropriate IP address.
• 🔁 On subsequent visits to the same site, the process is quicker because the browser checks its local DNS cache before making a DNS request to the server.
• 🚀 The speed of internet navigation is greatly influenced by the number of requests sent to servers and the responses received by clients.
• 💾 DNS Cache is a local file on the computer that stores domain names along with their corresponding IP addresses to speed up website access.
• 📚 The term 'cache' refers to a resource in our fast memory that saves us time by avoiding the need to search repeatedly.
• 🌐 When a domain name is entered in the browser, the computer first checks the local DNS cache, and only if the desired IP address is not found will it request it from the DNS server.
• 🛑 The cache does not make us rich, but it does make internet access fast and efficient.
• 🔑 The script emphasizes the importance of cache in improving the user experience on the internet by reducing load times.
• 📈 The script provides insight into how caching mechanisms work to enhance the efficiency of internet navigation.

Q & A

What is the purpose of a computer's cache?

A computer's cache is used to store information about websites visited to improve the speed and efficiency of internet access.

What happens when you visit a website for the first time?

When visiting a website for the first time, the browser sends a DNS request, and the DNS server responds with the appropriate IP address.

What is the role of DNS in accessing a website?

DNS (Domain Name System) translates domain names into IP addresses that computers use to access websites.

Why does the browser save DNS requests?

The browser saves DNS requests to reduce the time it takes to load a website by avoiding the need to repeatedly query the DNS server for the same information.

What is the term used for the stored DNS information on a computer?

The stored DNS information is called a DNS Cache, which is kept in the computer's memory to save time in searching.

How does the browser handle subsequent visits to the same website?

For subsequent visits to the same website, the browser first checks the local DNS cache. If the IP address is not found in the cache, it then sends a request to the DNS server.

How does the DNS cache improve internet access speed?

The DNS cache improves internet access speed by reducing the number of DNS requests sent to servers, thus speeding up the process of loading websites.

What is the relationship between DNS cache and internet efficiency?

The DNS cache contributes to internet efficiency by storing domain-to-IP mappings, which reduces the time and resources needed for each website visit.

What is the technical term for the cache in English?

The technical term for cache in English is 'cache', which refers to a resource in our fast memory that saves us time in searching.

How does the browser know to check the DNS cache before sending a DNS request?

The browser is programmed to automatically check the DNS cache before sending a DNS request to ensure efficiency and speed in accessing websites.

Why is the DNS cache considered valuable, even though it doesn't make us rich?

The DNS cache is considered valuable because it makes internet access faster and more efficient, which is a form of wealth in terms of time and resource savings.