Networking Chapter 15

Question 1

Which of the following statements about wired and wireless LANs is correct?

A) Both operate in the lower two layers of the TCP/IP protocol suite.
B) Wired LANs operate in the lower two layers and wireless LANs operate in the lower three layers of the TCP/IP protocol suite.
C) Wired LANs operate in the lower three layers and wireless LANs operate in the lower two layers of the TCP/IP protocol suite.
D) Both operate in the lower three layers of the TCP/IP protocol suite.

Answer 1

A) Both operate in the lower two layers of the TCP/IP protocol suite.

Question 2

IEEE has defined the specifications for a wireless LAN, called _______, which covers the physical and data-link layers.

Answer 2

IEEE 802.11

Question 3

The CSMA/CD algorithm does not work in wireless LAN because:

Answer 3

wireless host does not have enough power to work in a duplex mode.
of the hidden station problem.
signal fading could prevent a station at one end from hearing a collision at the other end.

Question 4

In IEEE 802.11, a ___ is made of stationary or mobile wireless stations and an optional central base station, known as the access point (AP).

Answer 4

ESS

Question 5

In IEEE 802.11, a BSS without an AP is called _________.

Answer 5

an ad hoc architecture

Question 6

In IEEE 802.11, a BSS with an AP is sometimes referred to as ____________.

Answer 6

an infrastructure network

Question 7

In IEEE 802.11, communication between two stations in two different BSSs usually occurs via two ________.

Answer 7

APs

Question 8

In IEEE 802.11, a station with ________ mobility is either stationary (not moving) or moving only inside a BSS.

Answer 8

no-transition

Question 9

In IEEE 802.11, a station with ________mobility can move from one BSS to another, but the movement is confined inside one ESS.

Answer 9

BSS-transition

Question 10

In IEEE 802.11, a station with ________ mobility can move from one ESS to another.

Answer 10

ESS-transition

Question 11

In IEEE 802.11, distributed coordination function (DCF) uses _______ as the access method.

Answer 11

CSMA/CA

Question 12

In IEEE 802.11, when a frame is going from one station in a BSS to another station in the same BSS, the address flag is _____.

Answer 12

00

Question 13

In IEEE 802.11, when a frame is coming from an AP and going to a station, the address flag is _______.

Answer 13

01

Question 14

In IEEE 802.11, when a frame is going from a station to an AP, the address flag is _____.

Answer 14

10

Question 15

In IEEE 802.11, when a frame is going from one AP to another AP in a wireless distribution system, the address flag is _____.

Answer 15

11

Question 16

In IEEE 802.11, the access method used in the PCF sublayer is ______.

Answer 16

polling

Question 17

In IEEE 802.11, the ______ is a time period used for collision avoidance.

Answer 17

NAV

Question 18

In IEEE 802.11, the addressing mechanism can include up to ______addresses.

Answer 18

four

Question 19

The original IEEE 802.11 uses _________.

Answer 19

either FHSS or DSSS

Question 20

The IEEE 802.11a uses _________.

Answer 20

OFDM

Question 21

The IEEE 802.11b uses _________.

Answer 21

DSSS

Question 22

The IEEE 802.11g uses _________.

Answer 22

OFDM

Question 23

The IEEE 802.11 FHSS uses ______ modulation.

Answer 23

FSK

Question 24

The IEEE 802.11 or IEEE 802.11b DSSS uses ______ modulation.

Answer 24

PSK

Question 25

The IEEE 802.11a, IEEE 802.11g, or IEEE 802.11n OFDM uses ______ modulation.

Question 26

Bluetooth is a _______ technology that connects devices (called gadgets) in a small area.

Answer 26

wireless LAN

Question 27

In Bluetooth, multiple ________ form a network called a _________.

Answer 27

piconets: scatternet

Question 28

A Bluetooth network consists of _____ primary device(s) and up to ____ secondary devices.

Answer 28

one; seven

Question 29

In Bluetooth, the current data rate is ____Mbps.

Question 30

The access method in Bluetooth is ________.

Answer 30

FDMA

Question 31

In Bluetooth, the _____ link is used when data integrity is more important than avoiding latency.

Answer 31

ACL

Question 32

Bluetooth uses ______ in the physical layer to avoid interference from other devices or other networks.

Answer 32

FHSS