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, He produce technical guides and tutorials on networking, cybersecurity, and AI applications.
What Is ISDN? Integrated Services Digital Network Explained
ISDN stands for Integrated Services Digital Network. It’s a circuit-switched technology that uses the local loop of the Public Switched Telephone Network (PSTN) to carry fully digital signals, rather than the analog signals traditional telephone lines were originally designed for. ISDN is a set of communication standards capable of transmitting voice, data, and signaling simultaneously...
What Is Dial-Up? How Dial-Up Modem Connections Work
Dial-up is a WAN connection technique established using a modem and an active PSTN (Public Switched Telephone Network) line. The modem dials a phone number attached to another modem at the destination end and establishes a connection capable of transferring data, using the ordinary analog telephone line as the transmission medium. Dial-up was, for decades,...
What Is PDH? Plesiochronous Digital Hierarchy Explained
It is the abbreviation for Plesiochronous Digital Hierarchy. The term “plesiochronous” comes from two Greek words: plesio, meaning “near,” and chronos, meaning “time.” In a plesiochronous network, the clocks in different network elements run close to the same rate but are not perfectly synchronized, so signal arrival times can drift slightly when multiplexing. It was...
Introduction to WAN Technologies
A LAN connects devices within a single building or campus. The moment you need to connect that LAN to another one across a city, a country, or the globe, you’re in WAN territory — a fundamentally different set of technologies, ownership models, and design trade-offs. Wide Area Networks are what make hybrid work, branch offices,...
Frame Control Field Format: The 11 Subfields Explained
The Frame Control field is the first two bytes of every 802.11 frame, and it’s arguably the single most important part of the header — it’s what tells a receiving station what kind of frame it’s looking at before anything else gets parsed. This guide breaks down all eleven subfields packed into those 2 bytes...
The 802.11 Wireless Frame: MAC Header Fields Explained
Every piece of data that travels over Wi-Fi is wrapped inside an 802.11 frame before it hits the air. Like any Layer 2 frame, an 802.11 frame consists of a header, a payload (frame body), and a Frame Check Sequence (FCS) for error detection. The 802.11 frame format is closely related to the Ethernet frame...
Wireless Deployment Solutions: Small vs. Large Scale, Explained for 2026
Wireless deployment strategy depends heavily on the size of the organization. A small office with a handful of users needs a very different approach than a campus or multi-site enterprise with hundreds of access points. Cisco offers distinct solutions for both ends of that spectrum, and the specific products involved have changed considerably since this...
Introduction to Wireless Networking: WLAN Fundamentals
Wireless communication transmits information between devices using radio waves instead of a physical medium like copper cable or fiber. It’s one of the fastest-growing areas in networking specifically because it removes the one constraint wired networks can’t escape: a device has to stay tethered to wherever its cable ends. What a WLAN Actually Is A...
Bridge Protocol Data Unit (BPDU): Frame Format, Fields, and How Root Bridge Election Actually Works
Every root bridge election, every port role assignment, and every failover this series has covered so far runs on one underlying mechanism: switches exchanging Bridge Protocol Data Units, or BPDUs. This article breaks down the BPDU frame field by field, walks through exactly how cost increments as a BPDU propagates through a topology, and clears...
Spanning Tree Path Cost: Root Port Election Explained
When a loop occurs in the switched network, STP uses path cost to resolve which ports forward and which block. Path cost is derived from a port’s speed. If two connected ports end up with equal path cost, spanning tree falls back to the lowest port ID as the final tiebreaker. For CCNA students, understanding...