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Puppet Tutorial
Besides Ansible and Chef, Puppet is another automation tool in CCNA certification so in this tutorial we will learn about it. Puppet is built on server-client architecture which comprises a master...
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DHCP_Sim_Quiz
Question 1 Examine the DHCP configuration between R2 and R3, R2 is configured as the DHCP server and R3 as the client. What is the reason R3 is not receiving the IP address via DHCP? A.On R3, DHCP is...
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Disclaimer MATERIALS PROVIDED ON THIS SITE (9tut.com) ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS...
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Port Security Tutorial
By default, all interfaces on a Cisco switch are in an enabled state, meaning that anyone can potentially connect to your network through a wall socket, posing a security risk. Port Security is a...
View ArticleCCNA Tutorials, Practice Labs & Lab Challenges
We have many tutorials and practice labs on our site to assist you in grasping the concept of the CCNA exam. We have summarized them here in one place and categorized them into specific topics, making...
View ArticleCCNA FAQs & Tips
CCNA is a long topic to talk about and there are many tips that can help you save much time when sitting in the exam hall. From the comments here and information from other places, this article tries...
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Forwarding per-hop behavior (PHB) for QoS Tutorial
Quality of Service (QoS) is a tool that allows our network to prioritize certain types of traffic. QoS defines the actions that a device can apply to a message between the time it enters the device...
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Key Security Concepts Tutorial
In the digital world, where we use computers and the internet for many things, keeping our information safe is one of the most important tasks. This tutorial will explore some of the popular and...
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Configure SSH for Remote Access on Cisco Router
One of the most popular way to access a Cisco router remotely is using Telnet but it is an unsecured method as the data is sent unencrypted. If a bad person grabs data from a Telnet session, he can see...
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How a router makes a forwarding decision
We all know when a packet reaches a router interface, the router will send the packet to the destination. But how can a router determines which route is the best to use to send the packet? In this...
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What is SDN?
Most traditional devices use a distributed architecture, in which each control plane is resided in a networking device. Each device will make its own decision. Therefore they need to communicate with...
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DHCP Snooping Tutorial
DHCP Snooping is a Layer 2 security feature that can be configured on a switch to listen DHCP traffic and block DHCP OFFER and DHCP ACK packets (which can only be sent from a DHCP server) on untrusted...
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Configure DHCP Packet Tracer Lab
In this real world scenario, we will configure R1 as a DHCP server while Client 1 will be DHCP client with the topology shown below: Note: If you are still not sure about DHCP, please read our DHCP...
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CCNA Testing Engine
To make your preparation easier, we have designed this online practice exam, which helps you become familiar with the format of the exam. You can practice with multiple-choice questions, drag-and-drop...
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Network Time Protocol (NTP) Tutorial
The Network Time Protocol (NTP) is a crucial service not only for Cisco devices but for most network devices. Any device needs to be accurately synchronized with a reliable time source such as an NTP...
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REST API Tutorial
An API (Application Programming Interface) allows different software applications to communicate with each other. It defines the methods and data formats that applications can use to request and...
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Generative AI vs Predictive AI Tutorial
Artificial intelligence (AI) is full of concepts that seem familiar at first glance, but often reveal much more complexity upon closer examination. One such example is the distinction between...
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Spine-Leaf Architecture Tutorial
Spine-leaf architecture is a modern network topology widely used in data centers and cloud environments. It’s designed to offer improved scalability, high availability, and consistent low-latency...
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