Mujtaba Khattak
Mujtaba Khattak is a network solutions architect specializing in SD-WAN, cloud infrastructure, and network optimization. He holds a BS in Artificial Intelligence from SZABIST, an MBA from Virtual University (VU), and Cisco certifications (CCNA and CCNP). As the founder of NetworkUstad.com, Mujtaba authors technical guides and tutorials on networking, cybersecurity, and AI applications, with over 160 published posts. He bridges AI innovation with practical networking solutions to empower IT professionals and enthusiasts.
Cisco Borderless Networks: Hierarchical Campus Design Explained
Cisco Borderless Networks is an architecture designed to enable secure, seamless connectivity for any user, device, or location, integrating wired and wireless access with unified policy and performance management. It’s built to address common enterprise IT challenges — mobility, security, and scalability — using Cisco Catalyst switches, ISR routers, and management tools like Cisco DNA...
Master File Transfer Protocol (FTP) Secure Your FTP Protocol Today (Updadted 2025)
This guide is tailored for network administrators and students using Windows (e.g., versions 10 or 11) and Linux (e.g., Ubuntu 22.04 or CentOS 7) operating systems. FTP operations can be performed using the built-in ftp command on both platforms, accessible via the Command Prompt (cmd) on Windows or the terminal (Ctrl + Alt + T)...
HTTP and HTML Explained: How the Web Communicates
HTTP and HTML are the two foundational technologies behind every web page you visit. They work together but do completely different jobs. HTTP (HyperText Transfer Protocol) is the application-layer protocol that governs how data is requested and delivered between a web server and a client. HTML (HyperText Markup Language) is the markup language that structures...
Master Client-Server and Peer-to-Peer and Boost Your Skills (Updated 2025)
Client-server and Peer-to-Peer terms are often used in computer networks. Both are network models that we use in our day-to-day lives. The Client-Server model focuses on information sharing, whereas the Peer-to-Peer network model focuses on connectivity to remote computers. The detailed explanation of both models is the following:- Client-Server Network Model In the client-server model,...
Master Application Layer and Boost Your Skills With this Exclusive Guide (Updated 2025)
This guide applies to Windows (e.g., 10/11) and Linux (e.g., Ubuntu 22.04). Configure application layer services via Command Prompt (cmd) on Windows or terminal (Ctrl + Alt + T) on Linux, as of 2025. It is the topmost OSI Model layer, consolidating the OSI’s application, presentation, and session layers into the TCP/IP model’s single application...
User Datagram Protocol (UDP): Complete Guide for CCNA
The User Datagram Protocol (UDP) is a lightweight Transport Layer protocol that provides fast, low-overhead data transmission between applications without establishing a connection first. Defined in RFC 768, UDP is one of the two core Transport Layer protocols alongside TCP and is directly tested on the CCNA 200-301 exam. Understanding UDP — its header structure,...
Mastering Host Address, Network Prefix, Network ID, and Broadcast ID in 2025
This article, “Mastering Prefix, Network ID, Broadcast ID, and Host Address” is the continuation of my previous articles about the IP address, which are the following: IP address Classes- Exclusive Explanation Positional Number System and Examples (Updated 2025) Network and Host Portion of IPv4 Address So, you need to study the above article to understand...
Positional Number System and Examples (Updated 2025)
In a positional number system, each symbol represents a different value depending on the position it occupies in a number, and each system has a value that relates to the number directly next to it. The total value of a positional number is the total of the resultant value of all positions. The decimal number...
Cisco IOS Command Modes Explained: User EXEC, Privileged EXEC, and Global Configuration Modes
Cisco IOS devices use hierarchical command modes to control access and prevent accidental misconfigurations. Whether you’re managing a router, switch, or preparing for the CCNA exam, understanding these modes is fundamental: Global configuration mode contains a number of sub-configuration modes (also called specific or extended configuration modes). The table below lists common configuration modes and...
How to Connect and Access a Cisco Router: The Ultimate 2025 Guide for CCNA Students
Connecting to a Cisco router is the first step toward mastering network configuration, a critical skill for CCNA students and aspiring network engineers. Understanding physical console access and remote SSH management is essential, whether setting up a home lab or troubleshooting enterprise networks. In 2025, mastering Cisco router connections is vital for CCNA certification and...