Question 1

List four advantages to using DSSS?

Accepted Answer

Error correction
Less interference on other systems
Shared frequency bandwidth
Security

Question 2

What are the two basic concepts involved with OFDM?

Accepted Answer

The first is breaking down the transmission into separate parts and sending each part in parallel simultaneously. That is, instead of sending one long stream of data as with FHSS or DSSS, OFDM sends the transmission in parallel across several channels.The second concept is that these parallel transmissions are sent at a slower rate. Although it may seem counter-intuitive, OFDM actually increases the overall speed by sending the data more slowly.

Question 3

The Physical Layer Convergence Procedure (PLCP)standards for 802.11b are based on ____.

Accepted Answer

A)  DSSS 
B)  FHSS 
C)  OFDM 
D)  PYS 
A)  DSSS 
B)  FHSS 
C)  OFDM 
D)  PYS A

Question 4

A frame is made up of which parts? (Choose all that apply.)

Accepted Answer

A)  segment 
B)  preamble 
C)  data 
D)  header 
A)  segment 
B)  preamble 
C)  data 
D)  header

Question 5

With FHSS,the sequence of changing frequencies is called the ___________ code.

Accepted Answer

The answer of With FHSS,the sequence of changing frequencies is...

Question 6

How does OFDM work?

Accepted Answer

A)  signals are broken up and the parts are sent in parallel 
B)  the same signal is sent on multiple channels 
C)  one signal is sent twice on the same channel 
D)  a signal is sent over a wired network at the same time as the wireless network 
A)  signals are broken up and the parts are sent in parallel 
B)  the same signal is sent on multiple channels 
C)  one signal is sent twice on the same channel 
D)  a signal is sent over a wired network at the same time as the wireless network

Question 7

Because of the relatively high speeds achieved with FHSS,it is widely implemented in WLAN systems.

Accepted Answer

A) True 
 B)False

Question 8

What techniques are used by vendors to achieve 2x mode for transmissions?

Accepted Answer

A)  combining frequency channels 
B)  using different coding rate schemes 
C)  increasing and reallocating the individual carriers 
D)  All of the above 
A)  combining frequency channels 
B)  using different coding rate schemes 
C)  increasing and reallocating the individual carriers 
D)  All of the above

Question 9

The purpose of the 802.11 PHY layer is to format packets to be received by the corresponding network protocol on the receiving device.

Accepted Answer

A) True 
 B)False

Question 10

What is the modulation type and DSSS coding technique used by 802.11b transmitting at 11 Mbps?

Accepted Answer

The modulation type is differe

Question 11

The 802.11a standard enables faster data rates than 802.11b due to which of the following?

Accepted Answer

A)  lower frequencies and decreased power 
B)  lower frequencies and increased power 
C)  higher frequencies and increased power 
D)  decreased power but higher frequencies 
A)  lower frequencies and decreased power 
B)  lower frequencies and increased power 
C)  higher frequencies and increased power 
D)  decreased power but higher frequencies

Question 12

The value of layers in the OSI reference model is that it divides networking into a series of tasks,and then illustrates how those tasks relate to each other.

Accepted Answer

A) True 
 B)False

Question 13

Describe how 802.11n uses the primary and secondary channel.

Accepted Answer

IEEE 802.11n WLANs can use channels that

Question 14

What is a disadvantage of narrowband transmissions?

Accepted Answer

A disadvantage of narrowband t

Question 15

DSSS uses a bit pattern called a ____ code to transmit bits.

Accepted Answer

A)  hopping 
B)  setting 
C)  dwelling 
D)  chipping 
A)  hopping 
B)  setting 
C)  dwelling 
D)  chipping

Question 16

Which is true about the 802.11a,802.11b,802.11g,and 802.11n standards?

Accepted Answer

A)  802.11a and 802.11g use the 5 GHz band 
B)  802.11b and 802.11g use the 2.4 GHz band 
C)  802.11a and 802.11b operate at up to 11 Mbps 
D)  802.11b and 802.11n operate at up to 54 Mbps 
A)  802.11a and 802.11g use the 5 GHz band 
B)  802.11b and 802.11g use the 2.4 GHz band 
C)  802.11a and 802.11b operate at up to 11 Mbps 
D)  802.11b and 802.11n operate at up to 54 Mbps

Question 17

The 802.11g standard outlines two mandatory modes along with one optional mode.Describe each mode.

Accepted Answer

The first mandatory mode is the same CCK

Question 18

Which OSI model layer picks the route packets take?

Accepted Answer

A)  network 
B)  presentation 
C)  physical 
D)  transport 
A)  network 
B)  presentation 
C)  physical 
D)  transport

Question 19

Which of the following are advantages of spread-spectrum versus narrowband transmissions? (Choose all that apply.)

Accepted Answer

A)  resistance to outside interference 
B)  efficiency due to limited spectrum use 
C)  lower power requirements 
D)  increased security 
A)  resistance to outside interference 
B)  efficiency due to limited spectrum use 
C)  lower power requirements 
D)  increased security

Question 20

Which type of RF signal uses only a single frequency for transmission?

Accepted Answer

A)  broadband 
B)  narrowband 
C)  spread-spectrum 
D)  orthogonal frequency 
A)  broadband 
B)  narrowband 
C)  spread-spectrum 
D)  orthogonal frequency

List four advantages to using DSSS?

What are the two basic concepts involved with OFDM?

The Physical Layer Convergence Procedure (PLCP)standards for 802.11b are based on ____.

A frame is made up of which parts? (Choose all that apply.)

With FHSS,the sequence of changing frequencies is called the ___________ code.

How does OFDM work?

Because of the relatively high speeds achieved with FHSS,it is widely implemented in WLAN systems.

What techniques are used by vendors to achieve 2x mode for transmissions?

The purpose of the 802.11 PHY layer is to format packets to be received by the corresponding network protocol on the receiving device.

What is the modulation type and DSSS coding technique used by 802.11b transmitting at 11 Mbps?

The 802.11a standard enables faster data rates than 802.11b due to which of the following?

The value of layers in the OSI reference model is that it divides networking into a series of tasks,and then illustrates how those tasks relate to each other.

Describe how 802.11n uses the primary and secondary channel.

What is a disadvantage of narrowband transmissions?

DSSS uses a bit pattern called a ____ code to transmit bits.

Which is true about the 802.11a,802.11b,802.11g,and 802.11n standards?

The 802.11g standard outlines two mandatory modes along with one optional mode.Describe each mode.

Which OSI model layer picks the route packets take?

Which of the following are advantages of spread-spectrum versus narrowband transmissions? (Choose all that apply.)

Which type of RF signal uses only a single frequency for transmission?

The World of Wireless

Wireless Local Area Networks

Radio Frequency Fundamentals

Antennas

Medium Access Control Layer Standards

WLAN Management and Architectures

Conducting a Site Survey

Wireless LAN Security Vulnerabilities

Implementing Wireless LAN Security

Managing a Wireless LAN

Wireless Network Troubleshooting and Optimization

Other Wireless Networks

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Exam 5: Physical Layer Standards

List four advantages to using DSSS?

What are the two basic concepts involved with OFDM?

The Physical Layer Convergence Procedure (PLCP)standards for 802.11b are based on ____.

A frame is made up of which parts? (Choose all that apply.)

With FHSS,the sequence of changing frequencies is called the ___________ code.

How does OFDM work?

Because of the relatively high speeds achieved with FHSS,it is widely implemented in WLAN systems.

What techniques are used by vendors to achieve 2x mode for transmissions?

The purpose of the 802.11 PHY layer is to format packets to be received by the corresponding network protocol on the receiving device.

What is the modulation type and DSSS coding technique used by 802.11b transmitting at 11 Mbps?

The 802.11a standard enables faster data rates than 802.11b due to which of the following?

The value of layers in the OSI reference model is that it divides networking into a series of tasks,and then illustrates how those tasks relate to each other.

Describe how 802.11n uses the primary and secondary channel.

What is a disadvantage of narrowband transmissions?

DSSS uses a bit pattern called a ____ code to transmit bits.

Which is true about the 802.11a,802.11b,802.11g,and 802.11n standards?

The 802.11g standard outlines two mandatory modes along with one optional mode.Describe each mode.

Which OSI model layer picks the route packets take?

Which of the following are advantages of spread-spectrum versus narrowband transmissions? (Choose all that apply.)

Which type of RF signal uses only a single frequency for transmission?

The World of Wireless

Wireless Local Area Networks

Radio Frequency Fundamentals

Antennas

Medium Access Control Layer Standards

WLAN Management and Architectures

Conducting a Site Survey

Wireless LAN Security Vulnerabilities

Implementing Wireless LAN Security

Managing a Wireless LAN

Wireless Network Troubleshooting and Optimization

Other Wireless Networks

Filters