Muhammad Khattak
Routing and switching specialist, CCNA certified, with extensive experience in network configuration and troubleshooting. Covers OSPF, EIGRP, VLAN management, and advanced routing concepts.
How to Verify Interface Settings
As a network engineer, ensuring that Cisco router interface settings are correctly configured is critical for maintaining network performance, security, and reliability. Verifying these settings involves checking interface settings status, IP configurations, duplex settings, and other parameters to ensure they align with the network design. This article provides a step-by-step guide to verifying Cisco router...
How to Enable IP Address on Network Switches
For CCNA and CCNP students, understanding how to enable IP address on network switches is critical for enabling remote management and ensuring efficient network operations. Network switches, unlike routers, primarily operate at Layer 2, forwarding frames based on MAC addresses. However, to manage a switch remotely using protocols like SSH, Telnet, HTTP, or HTTPS, an...
Introduction to Status LEDs of Ethernet and Network Devices
Device status LEDs are essential tools for CCNA and CCNP students, offering quick visual cues to diagnose network issues without needing to open a CLI session. These indicators on NICs, hubs, routers, and switches help troubleshoot connectivity, performance, and faults efficiently, often catching a physical-layer problem before you’d otherwise notice it in monitoring software. This...
Network Documentation: The Essential Guide to Boost Network Efficiency in 2025
Network documentation is a critical skill for CCNA and CCNP students, serving as the backbone of efficient network management and troubleshooting. Comprehensive documentation ensures quick recovery from failures, simplifies upgrades, and supports compliance with industry standards. This article explores the essential components of network documentation, including topology diagrams, server details, and backup procedures, providing practical...
Cisco Router Forwarding Mechanisms: Process Switching, Fast Switching, and CEF
Understanding Cisco router forwarding mechanisms is a cornerstone of networking for CCNA and CCNP students. Routers, the backbone of network connectivity, rely on efficient packet-forwarding mechanisms to direct traffic toward its destination. Cisco routers support three primary methods, Process Switching, Fast Switching, and Cisco Express Forwarding (CEF), each with unique characteristics affecting performance, scalability, and...
What is VLAN Attacks – Brief Explanation
In the previous article, I explained how trunks work. By default, trunk ports can use all VLANs and pass traffic for multiple VLANs across the same physical link between switches. The VLAN simplifies network administration and maintenance. It also improves the performance of the network, but it has some backhaul for hackers which is necessary...
What are Trunk Links? Common Problem and Troubleshooting
Trunk links are a common problem that mostly occurs due to incorrect configurations. Troubleshooting trunk links problems is a common task in networking. If a problem with a trunk is found and the cause is unknown, first, check the trunks for a native VLAN mismatch. If the native VLAN is correct, then check for trunk...
Dynamic Trunking Protocol (DTP) Explained
Dynamic Trunking Protocol, or DTP, is a Cisco proprietary protocol. It negotiates trunking between Cisco switches automatically. Instead of manually deciding whether a link should be access or trunk, two Cisco switches can figure it out between themselves. For CCNA and CCNP students, DTP shows up constantly. It’s part of every serious VLAN configuration discussion,...
Master SVI and VLAN Addressing Issues (Updated 2025)
Each VLAN in the network requires a unique IP subnet because two devices in the same VLAN with different subnet addresses cannot communicate. This is a common problem during VLAN configuration, and we can solve it by identifying the incorrect IP address configuration and changing the address to the correct one. For example, if you...
VLAN Trunking on Cisco Switches: Configuration and Troubleshooting Guide
VLAN trunking is a critical networking concept that allows multiple VLANs to traverse a single link between network devices, such as switches or routers. By enabling communication between devices in the same VLAN across different switches without requiring a router, trunking enhances network efficiency and scalability. For CCNA and CCNP students, understanding VLAN trunking is...