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DNS

Laptops & DesktopsServers

DNS Troubleshooting Guide

  Core Concepts of DNS Before diving into troubleshooting, a quick review of key concepts is helpful: DNS Resolver: The...
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Laptops & DesktopsServers

Windows DNS Server Behavior – Order of Operations:

In a Windows DNS server environment , if forwarders are configured, they take precedence over root hints for resolving external...
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SecurityServers

RFC 6761 – Special-Use Domain Names

The acronym “RFC” stands for Request for Comments. These documents are part of a series that describes how the Internet...
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Code

Python – MX Scanner

# Author: Kerry Cordero # Version: 1.0.0 # Description: This script will look at a file called "mx-records.txt" and run...
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Security

Security – DNS

DNS (Domain Name System) is an essential part of the internet’s infrastructure that translates human-friendly domain names to IP addresses....
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Laptops & DesktopsServers

DNS, SFTP, and FTPS: Why Firewalls Handle These Protocols Differently

1. DNS Resolution and Protocol Handling Both HTTPS and SFTP require DNS resolution if a domain name (FQDN) is used:...
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Routing & SwitchingServers

Data Flow – MX Records

When setting up domains and email services, it’s essential to grasp how different DNS records interact. The MX (Mail Exchange)...
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Servers

DNS – Domain Ownership in Microsoft Active Directory (Don’t use .local or UnOwned Domains)

Using a domain name within Microsoft Active Directory (AD) is pivotal, not just for routing and architectural considerations. Still, it...
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Servers

Understanding DNS: Why CNAME and MX Records Can’t Coexist for the Same Domain

DNS (Domain Name System) plays an indispensable role in web hosting and domain management. DNS is like a phonebook for...
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Code

Python – Simple DNS Lookup Tool

# Author: Kerry Cordero # Version: 1.0.0 # Description: This script prompts for the IP/FQDN, Record Type, DNS Server to...
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Active Directory (AD) API AWS Azure Best Practices BGP Certificates Cisco Cisco ACI Cisco ASA Cisco ASR Cisco Catalyst Cisco CLI Cisco ISE Cisco Nexus Cisco Stack DDOS Design DNS EIGRP F5 HTTP(S) IP Addressing and Subnetting Logging macOS Microsoft IIS Microsoft SQL Microsoft Windows OSPF Packet Capture Palo Alto Palo Alto CLI PDF Planning Ports PowerShell python QOS Splunk SSL Structured Cabling TLS Troubleshooting Upgrade VMWare
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  • Home
  • About
  • Disclaimer
  • Guides and Slides
    • AWS Well-Architected Framework
    • Facebook – Running BGP in the Data Center at Scale
    • Microsoft – Experiences with BGP in Large Scale Data Centers
    • Palo Alto PCNSE Study Guide
  • IP Calculator
  • Links
  • Contact

Categories

  • Business Management
  • Cloud
  • Code
  • Data Center
  • Laptops & Desktops
  • Load Balancing
  • Routing & Switching
  • Security
  • Servers
  • Uncategorized
  • VOIP
  • Wireless

Tags

Active Directory (AD) API AWS Azure Best Practices BGP Certificates Cisco Cisco ACI Cisco ASA Cisco ASR Cisco Catalyst Cisco CLI Cisco ISE Cisco Nexus Cisco Stack DDOS Design DNS EIGRP F5 HTTP(S) IP Addressing and Subnetting Logging macOS Microsoft IIS Microsoft SQL Microsoft Windows OSPF Packet Capture Palo Alto Palo Alto CLI PDF Planning Ports PowerShell python QOS Splunk SSL Structured Cabling TLS Troubleshooting Upgrade VMWare
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