Asad Ijaz
Lead Networking Architect and Editor at NetworkUstad. BS in Computer Networks and Security, CCNP and CCNA certified, with 11+ years of experience in enterprise network design, implementation, and troubleshooting. Writes practical tutorials on routing, IPv4 management, network automation, and security fundamentals.
Frame Relay Virtual Circuits (VCs): PVCs, SVCs, and DLCIs Explained
We’ve already covered the fundamentals of Frame Relay as a WAN encapsulation protocol. This guide goes deeper into the mechanism that makes Frame Relay work: the virtual circuit. Frame Relay provides connection-oriented data link layer communication specifically through virtual circuits, and understanding exactly how those circuits get established, identified, and torn down is what separates...
کلمہ شہادت -اسلامیات ایف جی کلاس ششم
سوال نمبر ٣ – درج ذیل سوالات کے مختصر جوابات تحریر کرے. ١. ارکان اسلام سے کیا مراد ہیں؟ جواب – ارکان اسلام سے مراد دین اسلام کے وہ بنیادی اصول اور اعمال ہیں جن پر اسلام کی پوری عمارت قائم ہے. ٢ – ارکان اسلام کی تعداد اور نام بیان کرے. جواب – ارکان...
اسلامیات – مشق برائے سبق توحید
سوال نمبر 3 – درج ذیل سوالات کے مختصر جواب تحریر کریں سوال ۔ عقیدہ توحید کا مفہوم لکھیں۔ جواب – توحید عربی زبان کا لفظ ہے جس کے لغوی معنی ایک ماننا ، یکتا جاننا ہے۔ شریعت ۔ کے اصطلاح میں توحید سے مراد اللہ تعالیٰ کو ایک ماننا ،یکتا جاننا ہے سوال –...
PPP Overview: The Point-to-Point Protocol Explained
PPP (Point-to-Point Protocol) is a WAN encapsulation protocol developed in the early 1990s as a successor to the older Serial Line Internet Protocol (SLIP). It’s an open standard, meaning the protocol can be used consistently across equipment from different vendors — a significant advantage over proprietary alternatives. PPP can run over a remarkably wide range...
Serial Cable: Types, Pinouts, and DTE/DCE Connections
A serial cable is used to interconnect DTEs (Data Terminal Equipment) and DCEs (Data Communications Equipment). DTEs are the devices that actually generate or receive the data being communicated, such as a computer, router, or terminal. DCEs are the devices that facilitate and relay that data across the connection, such as a modem or CSU/DSU....
Time Division Multiplexing (TDM): Complete Guide
Multiplexing is a technique that allows multiple logical signals to share a single physical channel. The two most fundamental multiplexing techniques in telecommunications and networking are Time Division Multiplexing (TDM) and its dynamic counterpart, Statistical Time Division Multiplexing (STDM). This guide focuses on TDM, its frame structure, real-world implementations in T1 and E1 circuits, Cisco...
Point-to-Point Communication Links: A Complete Guide
A point-to-point link is used when a permanent, dedicated connection is required between two locations. It’s a pre-established WAN communications path that securely connects two or more locations for private data services, without sharing that specific physical or logical path with other customers’ traffic. Point-to-point links are also commonly known by other names in the...
Serial Communication: RS-232, V.35, and HSSI Explained
Serial communication is a widely used technique for transferring data between processing equipment and various peripherals, and it’s also commonly used to transfer data across WAN links. In a WAN context, the sending router encapsulates data using a communication protocol, sends the encapsulated data across the physical medium, and the receiving router de-encapsulates it on...
Serial Port: How Serial Interfaces Work in Networking
A serial port allows a PC or network device to transmit or receive data one bit at a time over a single channel. Serial interfaces are the foundation of point-to-point WAN connections — the leased line links that connect remote sites across cities and countries. While USB has replaced serial ports on most PCs, serial...
VPN Technology: How Virtual Private Networks Work
VPN is the abbreviation for Virtual Private Network. VPN technology creates a safe, encrypted connection over an unsecured network, such as the Internet. It effectively extends a private network across a public network, letting remote users and offices communicate as if they were directly connected to the same private infrastructure. A virtual private network uses...