CCNA Review Questions – Mastering Networking Fundamentals

CCNA Review Questions – Mastering Networking Fundamentals

If you are preparing for the Cisco Certified Network Associate (CCNA) exam, mastering the fundamentals of networking is crucial for success. To help you assess your knowledge and skills, we have compiled a comprehensive list of review questions that cover key topics tested in the CCNA exam. This blog post is designed to serve as a valuable resource to reinforce your understanding of networking concepts and identify areas that require further study.

1. Question:

Explain the difference between a hub and a switch in a network. Illustrate with examples.

Answer: A hub is a simple networking device that operates at the physical layer (Layer 1) of the OSI model. It receives incoming data packets and broadcasts them to all devices connected to it. In contrast, a switch operates at the data link layer (Layer 2) and makes forwarding decisions based on MAC addresses. Switches are more intelligent than hubs as they create dedicated communication paths between devices, improving network efficiency. For example, let’s say we have a network with five computers connected through a hub. When Computer A sends data, it is received by the hub and broadcasted to all computers, regardless of the intended recipient. On the other hand, if the same network utilized a switch, the switch would deliver the data specifically to the intended recipient, minimizing unnecessary network traffic.

2. Question:

What is the purpose of a subnet mask in IP addressing? Provide an example subnet mask and explain the concept of subnetting.

Answer: A subnet mask is a 32-bit number used to divide an IP address into network and host portions. It determines the network’s size by specifying the range of IP addresses allocated to hosts within that network. For example, a subnet mask of (or /24 in CIDR notation) means that the first 24 bits of the IP address represent the network, and the remaining 8 bits represent the host. Subnetting allows network administrators to create multiple logical networks within a single network infrastructure. By dividing a network into smaller subnets, organizations can efficiently manage IP address allocation, improve network performance, and enhance security by isolating different departments or functions.


In this blog post, we have covered only a few sample CCNA review questions to give you a taste of what to expect in the exam. It is highly recommended to study from official Cisco exam materials, books, and practice exams to ensure thorough preparation. Remember that successful completion of the CCNA exam validates your understanding of networking fundamentals and opens up opportunities for a rewarding career in the field of networking. Good luck with your preparations!

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