Wireless Network Essentials

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

Which of the following correctly describes the function of an access point (AP) in a wireless network?

  • It primarily manages the encryption and decryption of data transmitted over the airwaves.
  • It acts as a bridge, connecting wireless devices to a wired LAN using standards like Wi-Fi. (correct)
  • It dynamically adjusts the bandwidth allocation for different devices on the network.
  • It serves as a central repository for user authentication credentials.

What is the primary role of the Service Set Identifier (SSID) in a WLAN?

  • Encryption of data transmitted over the wireless network.
  • Managing the allocation of IP addresses to devices on the network.
  • Providing a unique network name for devices to connect to the correct wireless network. (correct)
  • Controlling access to specific websites or online services.

Which statement accurately describes the concept of bandwidth in the context of wireless networks?

  • A security protocol that encrypts wireless communications.
  • The geographical area covered by a wireless signal.
  • The amount of data that can be transmitted over a connection in a given amount of time, measured in bits per second (bps). (correct)
  • The frequency range over which a wireless signal operates.

How does Orthogonal Frequency-Division Multiplexing (OFDM) improve data transmission?

<p>By dividing a single high-speed data stream into multiple slower streams transmitted in parallel, reducing interference. (A)</p>
Signup and view all the answers

What is the primary advantage of using Frequency-Hopping Spread Spectrum (FHSS) in wireless communication?

<p>Enhanced security by making it more difficult for unauthorized parties to intercept or jam the signal. (B)</p>
Signup and view all the answers

In wireless networking, what is the significance of the Industrial, Scientific, and Medical (ISM) band?

<p>It is a set of frequencies designated for use by industrial, scientific, and medical communities. (D)</p>
Signup and view all the answers

How does Multiple Input, Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) contribute to 4G and 5G wireless communication services?

<p>By reducing interference and increasing channel robustness, improving spectral efficiency. (A)</p>
Signup and view all the answers

What distinguishes Direct-Sequence Spread Spectrum (DSSS) from other data transmission schemes?

<p>It multiplies the original data signal with a pseudo-random noise-spreading code. (B)</p>
Signup and view all the answers

Which of the following best describes a 'hotspot' in the context of wireless networks?

<p>A location where wireless networks are publicly available for Internet access. (A)</p>
Signup and view all the answers

What is the role of the Basic Service Set Identifier (BSSID) in a wireless network?

<p>It uniquely identifies the access point (AP) or base station within a basic service set. (D)</p>
Signup and view all the answers

The term 'association' in wireless networking refers to which process?

<p>Connecting a wireless device to an access point (AP). (C)</p>
Signup and view all the answers

Global System for Mobile Communications (GSM) is best described by which of the following?

<p>A universal system used for mobile data transmission in wireless networks worldwide. (C)</p>
Signup and view all the answers

How does changing the BSS impact a user moving their device within a wireless network?

<p>It may not affect the connectivity of the wireless device as the device switches to a different AP. (D)</p>
Signup and view all the answers

Why is it important for devices connecting to the same WLAN to use the same SSID?

<p>To enable seamless communication and resource sharing within the network. (B)</p>
Signup and view all the answers

Which technology is employed by MIMO-OFDM to enhance the spectral efficiency of wireless communication by reducing interference and improving channel robustness?

<p>Spatial multiplexing and Orthogonal Frequency Division Multiplexing (A)</p>
Signup and view all the answers

When would FHSS be preferred over other wireless communication methods?

<p>When security is important. (A)</p>
Signup and view all the answers

In what specific environment would the use of DSSS be most advantageous?

<p>An environment susceptible to signal jamming or interference. (A)</p>
Signup and view all the answers

Which of the following scenarios presents a security risk directly associated with the increasing prevalence of public Wi-Fi hotspots?

<p>These scenarios increase the risk of unauthorized access to personal data due to less secure networks. (D)</p>
Signup and view all the answers

If a user were to move from one corner of a building to another, how could that shift impact the wireless connection of his or her device?

<p>The device might experience a change in the BSS it uses, but its overall connectivity isn't impacted. (D)</p>
Signup and view all the answers

A network technician is configuring a new wireless network. Which of the following steps is MOST important to ensure devices transmit data to the correct network?

<p>The technician should assign a unique SSID to the WLAN, ensuring all devices use it. (C)</p>
Signup and view all the answers

Signup and view all the answers

Flashcards

GSM

A universal system used for mobile data transmission in wireless networks worldwide.

Bandwidth

The amount of information that can be broadcast over a connection, measured in bits per second (bps).

Access Point (AP)

Connects wireless devices to a wired network using standards like Bluetooth and Wi-Fi.

BSSID

MAC address of an AP that has set up a basic service set (BSS).

Signup and view all the flashcards

ISM Band

Set of radio frequencies reserved internationally for industrial, scientific, and medical purposes.

Signup and view all the flashcards

Hotspot

Locations offering wireless internet access for public use.

Signup and view all the flashcards

Association

The process of a wireless device connecting to an access point.

Signup and view all the flashcards

SSID

A unique 32-character identifier for wireless networks, allowing devices to connect to the correct network.

Signup and view all the flashcards

OFDM

A digital modulation technique splitting a signal into multiple orthogonal carrier frequencies.

Signup and view all the flashcards

MIMO-OFDM

Enhances spectral efficiency in wireless communication using multiple antennas and orthogonal frequencies.

Signup and view all the flashcards

DSSS

A spread spectrum technique multiplying the data signal with a pseudo-random noise code to protect against interference.

Signup and view all the flashcards

FHSS

A method of transmitting radio signals by rapidly switching the carrier among many frequency channels.

Signup and view all the flashcards

Study Notes

  • Wireless networks transmit data through electromagnetic waves, using specific terminology.

Global System for Mobile Communications (GSM)

  • GSM is a universal system facilitating mobile data transmission in wireless networks globally.

Bandwidth

  • Bandwidth signifies the amount of data that can be transmitted over a connection.
  • It is typically measured in bits per second (bps), representing the data transfer rate.

Access Point (AP)

  • An AP connects wireless devices to a wireless or wired network.
  • It enables wireless communication via standards like Bluetooth and Wi-Fi.
  • An AP acts as a bridge between a wired LAN and a wireless network.

Basic Service Set Identifier (BSSID)

  • A BSSID is the MAC address of an AP or base station within a basic service set (BSS).
  • Users are often unaware of the BSS to which they are connected.
  • As a user moves, the BSS can change due to AP range variations.
  • These changes do not always affect the wireless device's connectivity.

Industrial, Scientific, and Medical (ISM) Band

  • An ISM band contains frequencies designated for use by industrial, scientific, and medical communities internationally.

Hotspot

  • Hotspots are public locations offering wireless network access.
  • These areas provide Wi-Fi, enabling users to connect to the Internet.

Association

  • Association is the process of connecting a wireless device to an AP.

Service Set Identifier (SSID)

  • An SSID is a unique, 32-character alphanumeric identifier for a WLAN.
  • It functions as the wireless network's identifier.
  • Devices on the same WLAN must use the same SSID.

Orthogonal Frequency-Division Multiplexing (OFDM)

  • OFDM is a digital modulation technique that divides a signal into multiple orthogonal carrier frequencies.
  • It maps information onto carrier phase, frequency, or amplitude changes.
  • OFDM shares bandwidth with independent channels.
  • It supports higher bit rates than parallel channel operation.
  • Also described as a method of encoding digital data on multiple carrier frequencies.

Multiple Input, Multiple Output-Orthogonal Frequency-Division Multiplexing (MIMO-OFDM)

  • MIMO-OFDM enhances the spectral efficiency of 4G and 5G wireless communication.
  • The technique reduces interference and strengthens channel robustness.

Direct-Sequence Spread Spectrum (DSSS)

  • DSSS is a spread spectrum technique that multiplies data signals with a pseudo-random noise-spreading code.
  • It protects signals against interference or jamming.
  • DSSS is also referred to as a data transmission or modulation scheme.

Frequency-Hopping Spread Spectrum (FHSS)

  • FHSS transmits radio signals by rapidly switching a carrier among multiple frequency channels.
  • It reduces the effectiveness of unauthorized interception or jamming.
  • Transmitters implementing FHSS hop between frequencies using a specified algorithm, known to both sender and receiver.
  • FHSS is also known as frequency-hopping code-division multiple access (FH-CDMA).

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team
Use Quizgecko on...
Open
Browser
Browser