TryHackMe DNS in Detail
References
- Try Hack Me. (2021). DNS in Detail - How the web works [YouTube Video]. In YouTube. https://youtu.be/jpTY1S5vs9k
What is DNS?
What does DNS Stand for?
- According to the information provided in the question:
DNS (Domain Name System) provides a simple way for us to communicate with devices on the internet without remembering complex numbers.
Answer: Domain Name System
Domain Hierarchy
What is the maximum length of a subdomain?
- According to the information provided in the question:
A subdomain name has the same creation restrictions as a Second-Level Domain, being limited to 63 characters and can only use a-z 0-9 and hyphens (cannot start or end with hyphens or have consecutive hyphens).
Answer: 63
Which of the following characters cannot be used in a subdomain: 3, b, _ or -?
Answer: _
What is the maximum length of a domain name?
- According to the information provided in the question:
You can use multiple subdomains split with periods to create longer names, such as
jupiter.servers.tryhackme.com. But the maximum length must be kept below 253 characters.
Answer: 253
What type of TLD is .co.uk?
- According to the information provided in the question:
There are two types of TLD, gTLD (Generic Top Level) and ccTLD (Country Code Top Level Domain).
Answer: ccTLD
Record Types
What type of record would be used to advise where to send email?
- According to the information provided in the question:
MX Record
These records resolve to the address of the servers that handle the email for the domain you are querying...
Answer: MX
What type of record handles IPv6 addresses?
- According to the information provided in the question:
AAAA Record
These records resolve to IPv6 addresses, for example 2606:4700:20::681a:be5
Answer: AAAA
Making A Request
What field specifies how long a DNS record should be cached for?
- According to the information provided in the question:
DNS records all come with a TTL (Time To Live) value. This value is a number represented in seconds that the response should be saved for locally until you have to look it up again.
Answer: TTL
What type of DNS Server is usually provided by your ISP?
- According to the information provided in the question:
A Recursive DNS Server is usually provided by your ISP, but you can also choose your own.
Answer: recursive
What type of server holds all the records for a domain?
- According to the information provided in the question:
An authoritative DNS server is the server that is responsible for storing the DNS records for a particular domain name and where any updates to your domain name DNS records would be made.
Answer: authoritative
Practical
What is the CNAME of shop.website.thm?
- Using the interactive terminal provided:
user@thm:~$ nslookup --type=CNAME shop.website.thm
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
shop.website.thm canonical name = shops.myshopify.com
Answer: shops.myshopify.com
What is the value of the TXT record of website.thm?
- Using the interactive terminal provided:
user@thm:~$ nslookup --type=TXT website.thm
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
website.thm text = "THM{7012BBA60997F35A9516C2E16D2944FF}"
Answer: THM{7012BBA60997F35A9516C2E16D2944FF}
What is the numerical priority value for the MX record?
- Using the interactive terminal provided:
user@thm:~$ nslookup --type=MX website.thm
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
website.thm mail exchanger = 30 alt4.aspmx.l.google.com
Answer: 30
What is the IP address for the A record of www.website.thm?
- Using the interactive terminal provided:
user@thm:~$ nslookup --type=A website.thm
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: website.thm
Address: 10.10.10.10
Answer: 10.10.10.10
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