CCNA 200-125 Questions and Answers

CCNA 200-125 Questions and Answers

The CCNA 200-125 exam is a comprehensive assessment designed to test your skills and knowledge in different areas of networking. In this blog post, we will provide you with a set of relevant questions and detailed answers to help you prepare for this exam thoroughly. Whether you’re a beginner or seeking to enhance your networking expertise, these questions cover various topics that will challenge and expand your understanding.

Question 1: What is a MAC address?

A MAC address, short for Media Access Control address, is a unique identifier assigned to a network interface card (NIC) by the manufacturer. It consists of six groups of two hexadecimal digits, separated by colons or hyphens. MAC addresses are used to facilitate communication between devices on a local network.

Answer:

A MAC address is a hardware address that uniquely identifies a device on a LAN. It is assigned to the network interface card and is used to identify the source and destination of data packets transmitted over the network. MAC addresses are essential for Ethernet-based networks.

Question 2: What is the difference between a hub and a switch?

A hub is a networking device that broadcasts incoming data packets to all connected devices, while a switch forwards data packets only to the specified device based on its MAC address. Switches create separate collision domains, thereby improving network efficiency.

Answer:

A hub is a basic networking device that operates on the physical layer of the OSI model. It receives data packets from one device and broadcasts them to all other connected devices. This means that all devices connected to a hub share the same bandwidth, and collisions can occur when multiple devices transmit data simultaneously.

A switch, on the other hand, operates on the data link layer of the OSI model. It is more intelligent than a hub and can determine the MAC addresses of devices connected to it. When a switch receives a data packet, it examines the destination MAC address and forwards the packet only to the port connected to the destination device, eliminating collisions and improving network performance.

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