Question 1

Which layer of the OSI reference model permits the devices on the network to hold ongoing communications across the network?

Accepted Answer

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

Question 2

What are two safeguards used by 802.11n that can protect against interference caused by channel bonding? (Choose two.)

Accepted Answer

A)  convolutional coding rate 
B)  Dynamic Frequency Selection 
C)  Phased Coexistence Operation 
D)  variable guard interval 
A)  convolutional coding rate 
B)  Dynamic Frequency Selection 
C)  Phased Coexistence Operation 
D)  variable guard interval

Question 3

A numeric value called a ____________ is assigned to a frequency range since using frequency range values can become tedious.

Accepted Answer

The answer of A numeric value called a ____________ is...

Question 4

IEEE has divided the ____ layer into two sublayers: Logical Link Control (LLC)and Media Access Control (MAC).

Accepted Answer

A)  Physical 
B)  Data Link 
C)  Transport 
D)  Session 
A)  Physical 
B)  Data Link 
C)  Transport 
D)  Session

Question 5

Narrowband transmissions require significant power for the signal to be transmitted because the signal must exceed the ____________________,or the total amount of outside interference,by a substantial margin.

Accepted Answer

The answer of Narrowband transmissions require significant power for the...

Question 6

A 1 Mbps transmission rate is achieved by sending a single symbol every microsecond.

Accepted Answer

A) True 
 B)False

Question 7

At which layers of the OSI model do 802.11 wireless LANs function? (Choose all that apply.)

Accepted Answer

A)  Physical 
B)  Data Link 
C)  Network 
D)  Transport 
A)  Physical 
B)  Data Link 
C)  Network 
D)  Transport

Question 8

OFDM sends the transmission in parallel across several channels.

Accepted Answer

A) True 
 B)False

Question 9

In FHSS,the amount of time needed to move from one frequency to another is the ____ time.

Accepted Answer

A)  dwell 
B)  switch 
C)  lift 
D)  hop 
A)  dwell 
B)  switch 
C)  lift 
D)  hop

Question 10

Which of the following are enhancements of the 802.11n standard?

Accepted Answer

A)  40 MHz channels and variable guard interval 
B)  20 MHz channels and fixed guard interval 
C)  bonding of two 10 MHz channels 
D)  operation in the 40 GHz frequency range 
A)  40 MHz channels and variable guard interval 
B)  20 MHz channels and fixed guard interval 
C)  bonding of two 10 MHz channels 
D)  operation in the 40 GHz frequency range

Question 11

List three advantages of spread-spectrum transmissions over narrowband transmissions.

Accepted Answer

There are several advantages to spread-s

Question 12

Which system is preferred for 802.11 WLANs that operate at speeds in excess of 11 Mbps?

Accepted Answer

A)  DSSS 
B)  FHSS 
C)  OFDM 
D)  All are equally preferred 
A)  DSSS 
B)  FHSS 
C)  OFDM 
D)  All are equally preferred

Question 13

Match between columns
                        Premises: a delay built-in into the receiver to allow for late-arriving symbols
an IEEE 802.11a error correction technique that transmits a secondary copy along with the primary information
the process of sending multiple signals simultaneously
sharing a frequenct band between similar devices
an IEEE 802.11a modulation technique that increases the amount of data encoded to 250 Kbps per channel
the difference between the upper and lower frequencies
a proprietary transmission scheme used to double the effective rate of an 802.11a network
a modulation technique that splits a single high-speed digital signal into several slower signals running in parallel
a modulation technique that uses a range of frequencies that change during the transmission

Accepted Answer

The Answer of quadrature phase shift keying and colocation and is...

Question 14

Name and describe the fields that make up a PLCP frame?

Accepted Answer

Synchronization-The Synchronization fiel

Question 15

What are the two sublayers that the OSI Physical layer is broken into with the IEEE model?

Accepted Answer

Physical Layer Conve

Question 16

DSSS makes it possible to share the frequency with similar devices by assigning each device a unique chipping code,a function known as what?

Accepted Answer

A)  chipping variation 
B)  colocation 
C)  multiplexing 
D)  intersymbol assignment 
A)  chipping variation 
B)  colocation 
C)  multiplexing 
D)  intersymbol assignment

Question 17

Which sublayer of the Physical layer reformats data received from the MAC layer when transmitting?

Accepted Answer

A)  PMD 
B)  LLC 
C)  Data Link 
D)  PLCP 
A)  PMD 
B)  LLC 
C)  Data Link 
D)  PLCP

Question 18

The amount of time that a transmission occurs on a specific frequency is called the ____________________ time.

Accepted Answer

The answer of The amount of time that a transmission...

Question 19

From top to bottom,list the 7 layers of the OSI model.

Accepted Answer

Application, Present

Question 20

What is a disadvantage of narrowband transmissions?

Accepted Answer

A)  requires a complicated algorithm 
B)  not well regulated 
C)  expensive to implement 
D)  interference from another radio signal 
A)  requires a complicated algorithm 
B)  not well regulated 
C)  expensive to implement 
D)  interference from another radio signal

Which layer of the OSI reference model permits the devices on the network to hold ongoing communications across the network?

What are two safeguards used by 802.11n that can protect against interference caused by channel bonding? (Choose two.)

A numeric value called a ____________ is assigned to a frequency range since using frequency range values can become tedious.

IEEE has divided the ____ layer into two sublayers: Logical Link Control (LLC)and Media Access Control (MAC).

Narrowband transmissions require significant power for the signal to be transmitted because the signal must exceed the ____________________,or the total amount of outside interference,by a substantial margin.

A 1 Mbps transmission rate is achieved by sending a single symbol every microsecond.

At which layers of the OSI model do 802.11 wireless LANs function? (Choose all that apply.)

OFDM sends the transmission in parallel across several channels.

In FHSS,the amount of time needed to move from one frequency to another is the ____ time.

Which of the following are enhancements of the 802.11n standard?

List three advantages of spread-spectrum transmissions over narrowband transmissions.

Which system is preferred for 802.11 WLANs that operate at speeds in excess of 11 Mbps?

Name and describe the fields that make up a PLCP frame?

What are the two sublayers that the OSI Physical layer is broken into with the IEEE model?

DSSS makes it possible to share the frequency with similar devices by assigning each device a unique chipping code,a function known as what?

Which sublayer of the Physical layer reformats data received from the MAC layer when transmitting?

The amount of time that a transmission occurs on a specific frequency is called the ____________________ time.

From top to bottom,list the 7 layers of the OSI model.

What is a disadvantage of narrowband transmissions?

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

Exam 5: Physical Layer Standards

Which layer of the OSI reference model permits the devices on the network to hold ongoing communications across the network?

What are two safeguards used by 802.11n that can protect against interference caused by channel bonding? (Choose two.)

A numeric value called a ____________ is assigned to a frequency range since using frequency range values can become tedious.

IEEE has divided the ____ layer into two sublayers: Logical Link Control (LLC)and Media Access Control (MAC).

Narrowband transmissions require significant power for the signal to be transmitted because the signal must exceed the ____________________,or the total amount of outside interference,by a substantial margin.

A 1 Mbps transmission rate is achieved by sending a single symbol every microsecond.

At which layers of the OSI model do 802.11 wireless LANs function? (Choose all that apply.)

OFDM sends the transmission in parallel across several channels.

In FHSS,the amount of time needed to move from one frequency to another is the ____ time.

Which of the following are enhancements of the 802.11n standard?

List three advantages of spread-spectrum transmissions over narrowband transmissions.

Which system is preferred for 802.11 WLANs that operate at speeds in excess of 11 Mbps?

Name and describe the fields that make up a PLCP frame?

What are the two sublayers that the OSI Physical layer is broken into with the IEEE model?

DSSS makes it possible to share the frequency with similar devices by assigning each device a unique chipping code,a function known as what?

Which sublayer of the Physical layer reformats data received from the MAC layer when transmitting?

The amount of time that a transmission occurs on a specific frequency is called the ____________________ time.

From top to bottom,list the 7 layers of the OSI model.

What is a disadvantage of narrowband transmissions?

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