# How The Web Works (TryHackMe)

1. What does DNS stand for? `Domain Name System`
    
2. What is the maximum length of a subdomain? `63`
    
3. Which of the following characters cannot be used in a subdomain ( 3 b \_ - )? `_`
    
4. What is the maximum length of a domain name? `253`
    
5. What type of TLD is .co.uk? `ccTLD`
    
6. What type of record would be used to advise where to send email? `MX`
    
7. What type of record handles IPv6 addresses? `AAAA`
    
8. What field specifies how long a DNS record should be cached for? `TTL`
    
    **TTL (Time To Live):** This is a value in a DNS record that tells DNS resolvers how long they should cache (store) the record before requesting a fresh copy from the authoritative DNS server. The TTL value is specified in seconds. For example, a TTL of 3600 seconds means that the record can be cached for 1 hour before the resolver needs to query the DNS server again for updated information.
    
9. What type of DNS Server is usually provided by your ISP? `Recursive`
    
10. What type of server holds all the records for a domain? `Authoritative`
    
11. What is the CNAME of shop.website.thm? [`shops.myshopify.com`](http://shops.myshopify.com/) (enter shops and change to CNAME to get the right output)
    
12. What is the value of the TXT record of website.thm? `THM{7012BBA60997F35A9516C2E16D2944FF}`
    
13. What is the numerical priority value for the MX record? `30`
    
14. What is the IP address for the A record of www.website.thm? `10.10.10.10`
    

Thanks for reading through my article. At the moment I hope that I will remain consistent in this learning journey and keep practicing as the days and months come by. You can leave a comment.