Deck 24: Wireless Network Security

Question 1

Company wireless LANs or wireless access points to wired LANs in
close proximity may create overlapping transmission ranges.

Answer 1

True

Question 2

The transmission medium carries the radio waves for data transfer.

Answer 2

True

Question 3

The purpose of the authentication phase is to maintain backward
compatibility with the IEEE 802.11 state machine.

Answer 3

False

Question 4

A(n)__________ is any entity that has station functionality and provides access to the distribution system via the wireless medium for associated stations.

A)ESS
B)access point
C)distribution system
D)MPDU

Question 5

The primary purpose of the MAC layer is to transfer MSDUs
between MAC entities.

Question 6

WPA2 incorporates all of the features of the IEEE 802.11i WLAN
security specifications.

Question 7

A wireless client can be _______.

A)a cell phone
B)a Wi-Fi enabled laptop
C)a Bluetooth device
D)all of the above

Question 8

CRC is an error detecting code.

Question 9

In most data-link control protocols,the data-link protocol entity is
responsible not only for detecting errors using the CRC,but for
recovering from those errors by retransmitting damaged frames.

Question 10

An example of a(n)__________ attack is one in which bogus reconfiguration commands are used to affect routers and switches to degrade network performance.

A)identity theft
B)ad hoc network
C)network injection
D)man-in-the-middle

Question 11

The concerns for wireless security,in terms of threats,and
countermeasures,are different to those found in a wired environment,such as an Ethernet LAN or a wired wide-area network.

Question 12

The wireless environment lends itself to a ______ attack because it is so easy for the attacker to direct multiple wireless messages at the target.

A)DoS
B)man-in-the-middle
C)network injection
D)identity theft

Question 13

Any device that contains an IEEE 802.11 conformant MAC and
physical layer is a basic service set.

Question 14

The association service enables transfer of data between a station
on an IEEE 802.11 LAN and a station on an integrated IEEE 802.x LAN.

Question 15

The wireless access point provides a connection to the network or
service.

Question 16

The most significant source of risk in wireless networks in the
underlying communications medium.

Question 17

An extended service set (ESS)is a set of stations controlled by a
single coordination function.

Question 18

A wireless access point is a _______.

A)cell tower
B)Wi-Fi hot spot
C)wireless access point to a LAN or WAN
D)all of the above

Question 19

The MAC service data unit contains any protocol control
information needed for the functioning of the MAC protocol.

Question 20

The purpose of the discovery phase is for an STA and an AP to
recognize each other,agree on a set of security capabilities,and establish an association for future communication using those security capabilities.

Question 21

The principal threats to wireless transmission are disruption,_____________,and altering or inserting messages.

Question 22

The specification of a protocol,along with the chosen key length,is known as a ___.

A)distribution set
B)open system
C)cipher suite
D)realm

Question 23

The MPDU exchange for distributing pairwise keys is known as the _______.

A)pseudorandom function
B)cryptographic function
C)nonce
D)4-way handshake

Question 24

A system used to interconnect a set of basic service sets and LANs to create an extended service set is a _________.

A)distribution system
B)coordination function
C)MAC data unit
D)wireless access system

Question 25

The lowest layer of the IEEE 802 reference model is the __________ layer.

Question 26

The final form of the 802.11i standard is referred to as ________.

A)WEP
B)RSN
C)Wi-Fi
D)WPA

Question 27

The function of the ________ layer is to control access to the transmission medium and to provide an orderly and efficient use of that capacity.

A)CRC
B)MPDU
C)MAC
D)MSDU

Question 28

In order to accelerate the introduction of strong security into WLANs the Wi-Fi Alliance promulgated ________,a set of security mechanisms that eliminates most 802.11 security issues,as a Wi-Fi standard.

A)WPA
B)WEP
C)RSN
D)MAC

Question 29

Like TKIP,CCMP provides two services: message integrity and ________.

Question 30

A __________ attack occurs when an attacker continually bombards a wireless access point or some other accessible wireless port with various protocol messages designed to consume system resources.

Question 31

The smallest building block of a wireless LAN is a ______.

A)BSS
B)ESS
C)WPA
D)CCMP

Question 32

The fields preceding the MSDU field are referred to as the _________.

Question 33

A ____________ attack involves persuading a user and an access point to believe that they are talking to each other when in fact the communication is going through an intermediate attacking device.

Question 34

A __________ attack targets wireless access points that are exposed to non-filtered network traffic,such as routing protocol messages or network management messages.

Question 35

The wireless environment consists of three components that provide point of attack: the wireless client,the transmission medium,and the _________.

Question 36

The security requirements are: confidentiality,integrity,availability,authenticity,and __________.

Question 37

The unit of data exchanged between two peer MAC entities using the services of the physical layer is a(n)____________.

A)extended service set
B)MPDU
C)MSDU
D)station

Question 38

Two types of countermeasures are appropriate to deal with eavesdropping: signal-hiding techniques and ____________.

Question 39

______ is the recommended technique for wireless network security.

A)Using encryption
B)Using anti-virus and anti-spyware software
C)Turning off identifier broadcasting
D)All of the above

Question 40

A ________ is a secret key shared by the AP and a STA and installed in some fashion outside the scope of IEEE 802.11i. A,pre-shared key
B)master session key
C)pairwise master key
D)group master key

Question 41

There are two types of keys: ________ used for communication between a STA and an AP and group keys used for multicast communication.

Question 42

The field following the MSDU field is referred to as the ___________.

Question 43

The two services involved with the distribution of messages within a DS are distribution and _________.

Question 44

The 802.11i RSN security specification defines the following services: authentication,privacy with message integrity,and ________.

Question 45

At the top level of the group key hierarchy is the ___________.