Internet Services, Modems & Routers, Tech Reviews, Computer Networking, Security, and more!
Afroz Ahmad – Main Author of AfrozAhmad.com
Welcome to Afroz Ahmad – I’ve been writing about computer network technologies on my blog since 2012. My name is Afroz Ahmad, and I am a seasoned Network Engineer and author of AfrozAhmad.com.
I’m a CCIE with more than 20 years of experience in Computer Networking, Data Centers, Telecom, Internet Services, Cloud and ISPs. Currently, I work as a Network Designer for a leading ISP equipment vendor. I share my expertise through my blog and courses, aiming to help people solve everyday internet issues, select the appropriate equipment for their tech needs, and simplify complex networking concepts for both beginners and experienced professionals.
Reach out to me with any questions you have on Computer Networking, Modems, Routers, Internet services, etc.
Free networking and internet tools
Eight free tools I use myself: no signup, no account, and nothing you type leaves your device. Every one runs in your browser.
Wi-Fi Channel Overlap Visualiser
Find the clearest 2.4, 5 or 6 GHz channel for your building.
Open the tool
Rapid Spanning Tree Protocol – What Is RSTP In Networking?
Learn about Rapid Spanning Tree Protocol, what is RSTP in Networking, how it works, best practices, and how to configure it.
STP – Spanning Tree Protocol explained in detail
Spanning Tree Protocol is a layer 2 protocol that is designed to prevent loops in the network. This blog post explains Spanning Tree Protocol in-depth.
What is an EtherChannel in Networking – The Beginner’s Guide
EtherChannels boost network bandwidth, redundancy, and load balancing. This article covers what EtherChannels are, their significance, how they function, various types and modes, a configuration example, best practices, and troubleshooting.
VLAN Trunking Protocol: What is VTP in Networking
What is VTP in networking and what problem does it solve? – VTP is a Cisco proprietary layer2 messaging protocol that allows for the dynamic management of VLANs on a network. Let us dive in and understand VTP in depth.
Ethernet Auto‑Negotiation Explained: How It Works, Best Practices, and Fixing Duplex Mismatches
Learn how to configure your network with auto negotiation in ethernet devices. This setting will allow you to automatically detect and set the speed and duplex of your network interface/adapter.
Ethernet Switch vs Hub vs Router: Key Differences
Discover how Ethernet switches, hubs, and routers differ in speed, functionality, and network management.
What is the Definition of a Computer Network: Components, Uses, and Types
Computer networks are an amazing invention in networking that allows people and devices to connect and share information and services over vast distances. Learn about the basic Definition of a Computer Network, its connected components, uses, and types.
VLAN Tagged vs Untagged (Access vs Trunk): 802.1Q, Native VLAN, and Best Practices
Dive into the world of VLAN Tagged vs Untagged setups and grasp the fundamental differences. Learn how they impact network communication.
What are VLANs and Private VLANs, and How do they work?
Learn what are VLANs(Virtual Local Area Networks), or Virtual LANs, their benefits, configuration on switches, and how VLANs work. A brief overview of Private VLANs.
IP Subnetting Cheat Sheet (free PDF) for Network Engineers
IP Subnetting divides IP addresses and networks into smaller groups, determining the network and host bits. Learn more with the IP subnetting and CIDR cheat sheet.
IKEv1 vs IKEv2 – What is the Difference?
IKEv1 vs IKEv2 explained: IKEv1 is deprecated, while IKEv2 is the secure, modern Internet Standard for IPsec VPNs.
150+ Interview Questions for Network Engineers with Answers [Includes PDF]
Find out if you’re ready for the next step in your networking career with these tips and basic to advanced level interview questions of network engineers with answers.
What is Cisco vPC? A Complete Guide to Configuration & Benefits
What is Cisco vPC: It is a Cisco Nexus Switch-specific feature that provides the capability to the links of the third device that are physically connected to two different Cisco Nexus Switches to appear as a single port channel.
How to Ace a Video Interview: 15 Actionable Tips for
After coronavirus, recruiters post jobs and immediately start taking video interviews of the applicants to make a snap judgment for a good fit. In today's blog, we'll be discussing practical tips for video interview. We'll go over some simple tips, setup, do's, and don'ts for the interview.
HSRP vs VRRP vs GLBP – A Quick Guide
Which one to use while deciding between HSRP vs VRRP vs GLBP, this is really a matter of the type of equipment at your disposal, network design complexity, or sometimes personal preference. The main difference is that VRRP is industry-standard while HSRP and GLBP are Cisco-proprietary protocols.
What is VRRP, and How Do You Configure It on Cisco Devices?
VRRP is an open standard FHRP defined in RFC-3768. It can be configured on Cisco devices to quickly detect and respond to router failures, providing fault tolerance at the network layer. Watch the video and take the quiz for a brief overview of VRRP.
HSRP Config – The Definitive Guide with Video, Diagrams, Configs, and Quiz
HSRP is an FHRP (First Hop Redundancy Protocol) developed by Cisco to provide redundancy and high network availability almost anywhere in the network where we have two layer3 devices. Watch the short video and take a quiz to quickly understand the HSRP config.
Router on the Stick Configuration – Enterprise and Service Provider Example
The router on the stick configuration is a powerful and easy way to add additional equipment to your network without running a direct cable from your user device to the router. This post will discuss two scenarios where we can use this type of configuration: in an Enterprise network and a Service Provider network.
22 Done For You Behavioural Interview Questions and Answers
Behavioural interview questions and answers are designed to learn about your past behavior, which relates to the job description and position you are interviewing for. The general belief is that your past behavior is predictive of your future behavior, so the interviewer wants to learn what you have done to understand
How to Find Cisco Router Login Details
If you are looking for a way to find cisco router login details, you are in the right place! I will share with you two simple methods that can help you find your cisco router's login information.