Broadcast Domains and Collision Domains

Posted by in Security+ | 0 comments

Broadcast domains and collision domains are two important concepts you need to understand if you’re preparing for the Network+ exam. I recently added some new simulated performance-based questions in the Network+ premium site and this post includes some of that content.

Broadcast Domains and Collision Domains Sample Question

Here is an example of a performance based question you might see on the Network+ exam.

The following table lists common networking components. The second table lists different types of domains such as a single, multiple, and none. In a drag and drop question, you would be asked to drag the correct choice to the correct location in the first table. Here are three examples:

  • None. If you think the hub doesn’t have any collision domains, you would drag None to the location under the Hub in the Collision domain row.
  • Single. If you think the hub has a single collision domain, you would drag Single to the location under the Hub in the Collision domain row.
  • Multiple. If you think the hub has multiple collision domains, you would drag Multiple to the location under the Hub in the Collision domain row.

Devices

hub switchl2 router wap wirelessrouter

 Collision domain

box box box box box

 Broadcast domain

box box box box box

Domain choices

noneBox singleBox multipleBox

Broadcast Domains and Collision Domains Sample Question

What type of domains are created by a router? (Choose TWO.)

A. Single collision domain

B. Single broadcast domain

C. Multiple broadcast domains

D. Multiple collision domains

E. No collision domains

F. No broadcast domains

Network+ N10-006 Practice Test Questions

Pass the Network+ Exam (N10-006) The First Time You Take It

At  $277, this exam is expensive.

Make sure you're ready before exam day!

Full bank of at least 293* realistic multiple choice practice test questions with in-depth explanations to help you pass the Network+ exam the first time you take it. This set also includes several performance-based questions.

 Network+ Study Materials

30 Day Package 60 Day Package
Full bank of more than 293* N10-006 Network+ practice test questions.All questions include explanations so you'll know why the correct answers are correct, and why the incorrect answers are incorrect. Check Check
Performance-based QuestionsSeveral sets of performance-based questions. Question types include drag and drop, matching, and sorting type questions. See a demo here. checksm checksm

Bonus #1

Flashcard Set
  • 200 Network+ Flashcards to reinforce key testable concepts
  • View in random and non-random modes.
checksm

Bonus #2

Subnetting mini-tutorial that will help you answer two key question types
  • Identify how many hosts a subnet supports
  • Identify valid IP addresses within a subnet
checksm

Get the Network+ Study Materials Here

All questions include explanations so you'll know why the correct answers are correct, and why the incorrect answers are incorrect. This way no matter how CompTIA words the questions, you'll be able to answer them correctly. Multiple quiz formats to let you use these questions based on the way you learn.
  • Learn mode. Learn mode allows you to keep selecting answers until you select the correct answer. Once you select the correct answer, you'll see the explanation.
  • Test mode. In test mode, you can only see the correct answers and explanations after you complete the test.
This package allows you to go through the practice test questions in multiple ways based on how you learn best.
  • Domain 1 through 5** using Learn Mode
  • Domain 1 through 5 using Test Mode (Randomized)
  • The full bank of test questions using Learn Mode
  • The full bank of questions using Test Mode (Randomized)

Test your readiness with these quality questions

Understand the important important concepts using the explanations

 Network+ Study Materials

30 Day Package 60 Day Package
Full bank of more than 293* N10-006 Network+ practice test questions.All questions include explanations so you'll know why the correct answers are correct, and why the incorrect answers are incorrect. Check Check
Performance-based QuestionsSeveral sets of performance-based questions. Question types include drag and drop, matching, and sorting type questions. See a demo here. checksm checksm

Bonus #1

Flashcard Set
  • 200 Network+ Flashcards to reinforce key testable concepts
  • View in random and non-random modes.
checksm

Bonus #2

Subnetting mini-tutorial that will help you answer two key question types
  • Identify how many hosts a subnet supports
  • Identify valid IP addresses within a subnet
checksm

Get the Network+ Study Materials Here

Package includes several sets of performance-based questions. Two sets are simulated performance-based questions. Another set includes multiple performance-based questions using drag and drop capabilities. I love the way these new questions work. Check out a demo here.

You don't need to spend a fortune to get quality practice test questions

If you're like most people, you've already spent money on one or more Network+ books or courses. Now you need to ensure you understand the concepts and how they are tested. You can pay $100 or more for practice test questions, but you don't need to.

The set of practice test questions will give you a view of typical multiple choice questions you can expect to see on the live exam.

Get Certified Get Ahead with Network+ Practice Test Questions

 Network+ Study Materials

30 Day Package 60 Day Package
Full bank of more than 293* N10-006 Network+ practice test questions.All questions include explanations so you'll know why the correct answers are correct, and why the incorrect answers are incorrect. Check Check
Performance-based QuestionsSeveral sets of performance-based questions. Question types include drag and drop, matching, and sorting type questions. See a demo here. checksm checksm

Bonus #1

Flashcard Set
  • 200 Network+ Flashcards to reinforce key testable concepts
  • View in random and non-random modes.
checksm

Bonus #2

Subnetting mini-tutorial that will help you answer two key question types
  • Identify how many hosts a subnet supports
  • Identify valid IP addresses within a subnet
checksm

Get the Network+ Study Materials Here

Beware of questions that do not include explanations - many people have identified errors in these and even when there aren't errors, these types of questions encourage you to memorize answers instead of understanding the underlying concepts. * Don't you hate those little asterisks. Normally they mean "forget what you just read, it's not really true." Not so here though. The bank starts with 293 multiple choice practice test questions, but I'm still adding to them. There will be more. ** CompTIA identified five domains of objectives for the CompTIA Network+ exam. They are:
  • 1.0 Networking Architecture
  • 2.0 Network Operations
  • 3.0 Network Security
  • 4.0 Troubleshooting
  • 5.0 Industry Standards, Practices, and Network Theory

Broadcast Domains and Collision Domains Explanation

Here are some basic definitions:

  • Collision domain. A portion of a network where transmitted data from one device can collide with transmitted data from another device. When a collision occurs, both transmissions fail and both devices must transmit their data again. More collisions result in more traffic, and an overall slower network.
  • Broadcast domain. A portion of a network where broadcast data from one device can reach all other devices in the same broadcast domain.

These domains are created on network segments. A network segment is a portion of a network that is separate from other portions of a network. In many instances, it is a single cable, such as between a computer and a switch. In other instances, it includes multiple cables, such as between a hub and devices connected to the hub.

Broadcast Domains and Collision Domains Sample Question Answer

The correct answer is C and D (multiple broadcast domains and multiple collision domains).

  • Routers do not pass broadcast traffic, so they create multiple broadcast domains.
  • Routers also create multiple collision domains.

This graphic shows the full answer:

Devices

hub switchl2 router wap wirelessrouter

 Collision domain

singleBox multipleBox multipleBox singleBox multipleBox

 Broadcast domain

singleBox singleBox multipleBox singleBox multipleBox

Broadcast Domains and Collision Domains for a Hub

Hubs forward data they receive on any single port to all other ports. This includes both unicast and broadcast data. A hub creates a single segment, a single collision domain, and a single broadcast domain.

Broadcast Domains and Collision Domains for a Switch (layer 2)

Switches pass broadcast traffic so they create a single broadcast domain.

However, they create separate segments between each device and switch ports. This creates multiple segments and multiple collision domains.

Broadcast Domains and Collision Domains for a Router

Routers do not pass broadcast traffic, so they create multiple broadcast domains.

Routers also create multiple collision domains. Traffic between the router and any other device connected to the router (such as a hub, switch, or another router) creates a separate collision domain.

This answer assumes the connections are half-duplex connections. However, if these connections are using full duplex connections than there aren’t any collision domains on a router.

Broadcast Domains and Collision Domains for a Wireless Access Point (WAP)

A WAP connects wireless devices to a wired network. It passes broadcast transmissions just as hubs and switches pass broadcasts so it creates a single broadcast domain.

Wireless devices transmit data over the air  and these transmissions can collide with each other. Because of this, a WAP creates a single collision domain.

Broadcast Domains and Collision Domains for a Wireless Router

A wireless router (or WAP with wireless capabilities) creates multiple broadcast domains and multiple collision domains.

It’s worthwhile looking at the inner workings of a wireless router as shown in the following diagram. The top part of the diagram shows the connections the way you’d see them on the wireless router. The bottom part of the diagram shows the logical way they are connected.

  • The switch component passes broadcasts creating a single broadcast domain.
  • The switch component creates multiple collision domains for the wired devices and a single collision domain for the wireless devices.
  • The router component does not pass broadcasts creating multiple broadcast domains.
  • The router component creates multiple collision domains with one collision domain between the WAN connection and the ISP modem, and a second collision domain between the router component and the switch.
This answer also assumes the router connections are half-duplex connections. If they are using full duplex connections than there aren’t any collision domains on the router.

Leave a Comment

CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide

Subscribe To Our Newsletter

Join our mailing list and get a free excerpt of the CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide.  This excerpt includes the introduction and Chapter 1. 

You have Successfully Subscribed!

Get Certified Get Ahead is a participant in the Amazon Services LLC Associates Program,
an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.

Copyright © 2015 Get Certified Get Ahead. All Rights Reserved.