“Nice — below is a complete, step-by-step, blog-ready guide to install and configure a simple authoritative + optional recursive BIND9 DNS server on a fresh Ubuntu VM. It’s copyright-free and ready to paste into your notes or blog. Notes before you begin• This guide assumes Ubuntu 22.04 / 24.04 (netplan-based).• Replace example.test and IPs with …
Category: Computer Networks
Sep 22
CCIE (Cisco Certified Internetwork Expert)
REF: AI Tools/OpenAI/ChatGPT “🚀 What Does CCIE Involve? 🚀 🌐 The CCIE (Cisc/o Certified Internetwork Expert) is one of Cisco’s most respected certifications. It proves mastery of networking technologies at an expert level. 🔑 Topics & Skills Covered 1️⃣ Advanced routing & switching (enterprise-level networking).2️⃣ Network design and architecture.3️⃣ Security concepts, firewalls, VPNs, and threat …
Sep 22
Cisco’s Highest Certification: CCAr
REF: AI Tools/OpenAI/ChatGPT “🌐 Cisco’s Highest Certification: CCAr 🌐 1️⃣ Cisco certifications validate networking and IT expertise worldwide.2️⃣ The highest and most prestigious certification is Cisco Certified Architect (CCAr).3️⃣ CCAr represents the pinnacle of Cisco’s certification program.4️⃣ It goes beyond technical skills, focusing on enterprise-level network architecture.5️⃣ Candidates must design end-to-end solutions aligned with business …
Sep 22
Zone vs. Domain vs. Subdomain in DNS
Ref: AI Tools/OpenAI/ChatGPT Here’s a blog-ready, copyright-free article explaining Zone vs. Domain vs. Subdomain in DNS. Zone vs. Domain vs. Subdomain in DNS When learning DNS, people often get confused between the terms zone, domain, and subdomain. They sound similar, but each has a specific meaning in the Domain Name System. Let’s break them down …
Sep 16
IPV6 Addresses in ipconfig command in Windows
REF: AI Tools/OpenAI/ChatGPT Understanding IPv6 Addresses: Link-Local, Regular, and Temporary When you run the ipconfig command in Windows, you might notice that your network adapter lists not one but three different IPv6 addresses. These are the link-local address, a regular IPv6 address, and a temporary IPv6 address. Let’s break down what each one means, why …
Sep 14
How many secondary DNS servers you can have against one primary DNS server
REF: AI Tools/OpenAI/ChatGPT How many secondary DNS servers you can have against one primary DNS server Technically, there is no strict limit to how many secondary (slave) DNS servers you can have for a single primary (master) DNS server. It depends on: 1. DNS Protocol Limits 2. Practical Considerations 3. Typical Setup ✅ Summary: If …
Sep 14
Root servers and Anycast
Ref: AI Tools/OpenAI/ChatGPT Let’s break this down step by step. This is a subtle but important concept in networking. 1. What is Anycast? Anycast is a network addressing and routing technique where the same IP address is assigned to multiple physical servers in different locations. Think of it like a “call center number” that connects …
Sep 14
What is a Flat Name Space in DNS?
REF: AI Tools/ChatGPT/OpenAI/Internet What is a Flat Name Space? Sure! Let’s break down DNS flat name space clearly. 1. What is a Flat Name Space? A flat name space is a naming system where all names exist at the same level, without any hierarchy. In other words: 2. Flat vs. Hierarchical Name Space Feature Flat …
Sep 14
Subdomains and DNS Servers — Iterative vs Recursive
REF: AI Tools/OpenAI/ChatGPT You’re thinking very carefully about how authority and recursion interact in DNS, and you’re spot on to distinguish between root/TLDs and other domain servers. Let me unpack this clearly: Subdomains and DNS Servers — Iterative vs Recursive 1. Authoritative Servers (for domains & subdomains) Each of these servers is authoritative for its …
Sep 14
Why ISP DNS Servers Use Iteration
Ref: AI Tools/OpenAI/ChatGPT (posted as is) This is a really sharp question 👌 — you’re asking why resolvers bother with iteration instead of just having every server go fetch the full answer recursively on behalf of the client. Let’s unpack it: Why ISP DNS Servers Use Iteration 1. Root and TLD servers are not designed …
