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【TryHackMe】DNS in detail:Walkthrough

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概要

TryHackMe「DNS in detail」のWalkthroughです。

Task1

Q.What does DNS stand for?

A.Domain Name System

Task2

Q1.What is the maximum length of a subdomain?

Hint.Remember: A subdomain name has the same creation restrictions as a Second-Level Domain.

A.63

Q2.Which of the following characters cannot be used in a subdomain ( 3 b _ - )?

A._

Q3.What is the maximum length of a domain name?

A.253

Q4.What type of TLD is .co.uk?

A.ccTLD

Task3

Q1.What type of record would be used to advise where to send email?

A.MX

Q2.What type of record handles IPv6 addresses?

A.AAAA

Task4

Q1.What field specifies how long a DNS record should be cached for?

A.TTL

Q2.What type of DNS Server is usually provided by your ISP?

A.recursive

Q3.What type of server holds all the records for a domain?

A.authoritative

Task5

右上のViwe Siteを開くとnslookupを疑似的に実行できるアプリケーションがあります。

task5 q1 home.png

Q1.What is the CNAME of shop.website.thm?

DNS TypeCNAMEsubdomainをshopに指定して実行します。

task5 q1 get answer.png

CNAMEレコードにshops.myshopify.comが設定されていることが分かりました。

A.shops.myshopify.com

Q2.What is the value of the TXT record of website.thm?

Hint.No subdomain is needed in the terminal.

DNS TypeTXTに設定し、実行するとフラグゲットです。

task5 q2.png

A.THM{7012BBA60997F35A9516C2E16D2944FF}

Q3.What is the numerical priority value for the MX record?

DNS TypeMXに設定し実行すると優先順位が30に設定されているのを確認できました。

task5 q3.png

A.30

Q4.What is the IP address for the A record of www.website.thm?

DNS TypeAに、subdomainwwwを設定し実行するとwww.website.thmのIPアドレスが確認できました。

task5 q4.png

A.10.10.10.10

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