Course Content
Ethical Hacking Basics and Introduction
0/7
Ethical Hacking – Introduction
05:44
Ethical Hacking – Terminologies
43:25
Necessacity of Hacking
09:31
Understanding Hacking – Scenario Based
16:50
Elements of Security
05:13
Ethical Hacking Phases
06:00
Onfloor Penetration Testing Approach
08:23
Networking Concepts
0/7
All About Networking Devices
33:07
MAC Addresses
14:43
IP Addresses
32:34
Ports and Protocols Explained
32:42
OSI Model Explained
28:28
TCP 3 Way Handshake Explained
36:47
Internet Governance Explained
07:07
Ethical Hacking – LAB Setup
0/27
What are Hypervisors ?
05:52
Virtual Box Installation
05:07
Kali Linux – Part 1
36:28
Kali Linux – Part 2
28:38
BlackArch OS Installation
36:39
Parrot OS Installation
16:16
Ubuntu Installation in VirtualBOX
00:00
Linux File System
10:41
Linux Command Line Tutorials Part 1
01:12:18
Linux Command Line Tutorials Part 2
34:44
Windows Command Line Tutorials
21:09
Active Directory Introduction
06:56
Active Directory Introduction – Part 2
14:11
Active Directory Introduction – Part 3
08:32
2019 Windows Server Installation
10:51
Domain Controller and DHCP Setup
24:22
Windows 10 Installation
10:33
Windows 11 Installation
06:00
Creating Users Account and Computer Accounts on DC
25:17
DNS Server setup on Domain Controller
18:05
IIS Webserver Setup
09:09
XAMPP Server Setup
10:41
Metasploitable Setup
11:53
Router Configuration – Part 1
22:47
Router Configuration – Part 2
01:23:30
Installing Android OS in VirtualBox
08:36
Understanding Wireshark
20:08
Privacy and Anonymity
0/8
Security Privacy and Anonymity
09:23
Macchanger in Kali Linux
04:50
VPN Basics
14:53
Setup VPN on Windows Machine
10:30
Setup VPN on Kali Linux
07:26
TOR Browser
23:27
Proxychains and DNS Leak
54:52
Anonsurf
19:07
Ethical Hacking – Starts Here
0/70
Footprinting and Reconnaissance
12:31
Statement of Work – Learning with Project
08:15
Passive Information Gathering -1
14:28
Passive Information Gathering -2
09:07
Passive Information Gathering -3
10:40
Passive Information Gathering -4
31:37
Passive Information Gathering -5
10:55
Maryam OSINT – Tool
29:05
Google Hacking Guide
43:18
Shodan Guide
22:47
Wayback Machine
15:05
Load Balance Detection
09:12
Web Application Firewall Detection
06:43
AIG (Active Information Gathering) — Website Cloning
17:25
AIG (Active Information Gathering) — Colasoft
22:47
AIG (Active Information Gathering) — HP3
34:51
AIG (Active Information Gathering) — Sam Boy
09:04
AIG (Active Information Gathering) — Banners Grabbing
31:57
Scan and Diagnose – 1
07:04
Scan and Diagnose – 2
15:46
Enumeration
05:18
Nmap – Part 1
08:37
Zenmap – GUI Version of Nmap
14:34
Advanced Port Scanner
04:47
Super Scan
02:52
DumpSec
06:43
System Hacking Part 1
12:07
System Hacking Part 2
08:44
System Hacking Part 3
08:35
System Hacking Part 4
05:05
System Hacking Part 5
02:18
Keyloggers Explained
05:17
Virus
17:41
Trojan Horse
20:24
Social Engineering
15:40
Email Hacking
00:00
Sniffing
09:24
Sniffing with Wireshark
19:22
Cain and Able
08:28
Session Hijacking – 1
08:07
Session Hijacking – 2
05:14
Session Hijacking – 3
02:41
Web Server Hacking
28:03
SQL Injection – 1
06:57
SQL Injection – 2
25:04
Cross Site Scripting – XSS -1
11:19
Cross Site Scripting – XSS -2
20:59
Cross-Site Request Forgery – CSRF – 1
10:40
Cross-Site Request Forgery – CSRF – 2
07:09
Cross-Site Request Forgery – CSRF – 3
02:14
Remote File Inclusion
05:45
Introduction to Exploit Writing- Buffer Overflows
37:11
Reverse Engineering
34:43
Cryptography
24:44
Firewalls
28:50
Denial-Of-Service DOS Attacks -1
10:19
Denial-Of-Service DOS Attacks -2
07:16
Wireless Hacking
11:06
Metasploit Part 1
20:52
Metasploit Part 2
08:18
Penetration Testing Part 1
04:45
Penetration Testing Part 2
10:53
Penetration Testing Part 3
05:27
Router Hacking
26:30
Mobile Hacking
34:36
Web Application Penetration Testing Part 1
11:47
Web Application Penetration Testing Part 2
02:39
Web Application Penetration Testing Part 3
02:47
Web Application Penetration Testing Part 4
01:55
Web Application Penetration Testing Part 5
02:09
FREE Ethical Hacking from Entry to Expertise

A Domain Name System (DNS) server is a crucial component of the internet and local networks that translates human-readable domain names into machine-readable IP addresses. It serves as a distributed database that helps in the resolution of domain names to IP addresses and vice versa. Here’s a detailed explanation of DNS servers:

1. Definition:

  • Domain Name System (DNS): DNS is a hierarchical system that translates domain names, such as www.example.com, into IP addresses, like 192.168.1.1. DNS facilitates human-friendly addressing, making it easier for users to access websites and other network resources.

  • DNS Server: A DNS server is a computer or network device that runs DNS software and provides DNS services, responding to DNS queries and maintaining DNS records.

2. DNS Hierarchy:

  • Root Domain: At the top of the hierarchy is the root domain represented by a dot (.). Below the root, there are top-level domains (TLDs) like .com, .org, .net, and country-code TLDs like .uk, .de.

  • Second-Level Domain (SLD): Following the TLD is the second-level domain, which is the main part of a domain name (e.g., example.com).

  • Subdomain: Subdomains are additional hierarchical levels that precede the second-level domain (e.g., www.example.com).

3. DNS Resolution Process:

  • Query Initiation: When a user enters a domain name in a web browser, a DNS query is initiated to resolve the domain name to an IP address.

  • Local DNS Cache: The local device checks its DNS cache to see if it has a recent record for the requested domain. If found, the IP address is used, saving the need for further resolution.

  • Recursive Query: If the local cache does not have the required information, the device sends a recursive query to a DNS resolver, typically provided by the user’s internet service provider (ISP).

  • Root DNS Servers: If the DNS resolver doesn’t have the necessary information, it queries the root DNS servers, asking for the authoritative DNS server for the top-level domain.

  • TLD DNS Servers: The root DNS server responds with the authoritative DNS server for the TLD. The resolver then queries the TLD DNS server.

  • Authoritative DNS Server: The TLD DNS server responds with the authoritative DNS server for the specific domain. The resolver finally queries the authoritative DNS server for the IP address of the requested domain.

  • Response: The authoritative DNS server provides the IP address to the resolver, which, in turn, caches the information and returns the IP address to the user’s device.

4. Types of DNS Servers:

  • Authoritative DNS Server: This server holds the official DNS records for a domain. It responds directly to queries for records within its domain.

  • Recursive DNS Server (Resolver): This server performs the entire DNS resolution process on behalf of a client. It may query multiple authoritative DNS servers to find the requested information.

  • Root DNS Servers: These servers are the starting point for DNS resolution. There are 13 root DNS servers distributed worldwide.

  • TLD DNS Servers: These servers handle the top-level domains (e.g., .com, .org). They provide information about authoritative DNS servers for second-level domains.

5. DNS Record Types:

  • A Record: Maps a domain to an IPv4 address.
  • AAAA Record: Maps a domain to an IPv6 address.
  • CNAME (Canonical Name) Record: Alias of one domain to another.
  • MX (Mail Exchange) Record: Specifies mail servers responsible for receiving emails on behalf of a domain.
  • PTR (Pointer) Record: Used for reverse DNS lookups, mapping an IP address to a domain name.
  • NS (Name Server) Record: Specifies authoritative DNS servers for a domain.
  • SOA (Start of Authority) Record: Contains information about the domain, such as the primary DNS server, the email of the domain administrator, domain serial number, etc.

6. DNS Security:

  • DNSSEC (DNS Security Extensions): A suite of extensions that adds an additional layer of security by signing DNS data with cryptographic signatures.

  • DNS Firewall: Protects against DNS-based attacks, such as DNS spoofing and cache poisoning.

7. DNS Configuration and Management:

  • DNS servers are configured with various settings, including forwarders (servers to which queries are forwarded), caching settings, and security configurations.

  • DNS management tools, such as the DNS Manager on Windows Server or command-line tools like nslookup and dig, allow administrators to query and configure DNS settings.

8. Dynamic DNS (DDNS):

  • DDNS allows automatic updating of DNS records in real-time. It is often used in scenarios where devices receive dynamic IP addresses.

9. Anycast DNS:

  • Anycast is a network addressing and routing methodology that allows the same IP address to be assigned to multiple locations. Anycast DNS is used to improve the performance and reliability of DNS services.

10. DNS Forwarders:

  • DNS forwarders are servers to which a DNS server sends queries that it can’t resolve locally. Forwarders can be configured to improve DNS resolution efficiency.

11. Split DNS (Split-Horizon DNS):

  • Split DNS is a configuration where an organization’s DNS namespace is divided into two separate views: one for internal users and one for external users.

DNS is a fundamental component of the internet and network infrastructure, playing a critical role in translating human-readable domain names into machine-readable IP addresses. It is essential for the functionality, performance, and security of internet communications and local network operations.

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InSEC-Techs: Ethical Hacking and Penetration Testing School

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