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Test your basic knowledge |
CWNA 802.11 Mac Architecture
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 46 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A protection mechanism for mixed-mode environments. One of the benefits of using CTS-to-self over RTS/CTS as a protection mechanism is that the throughput will be higher. Because there are fewer frames being sent
CTS-to-Self
Power Management Bit
Disassociation
Frame
2. Power-saving mechanism used to allow a MIMO 802.11n device to power down all but one of it's radios
Spatial multiplexing power save (SM Power Save)
Power Save Multi Poll (PSMP)
Physical Medium Dependent (PMD)
WMM-PS (Power Save)
3. Prob request management frame with no SSID information
Power Save Multi Poll (PSMP)
Frame check sequence (FCS)
Physical Layer Convergence Procedure (PLCP)
Null Probe Request
4. The lower portion of the Physical layer. the PMD sublayer modulates and transmits the data as bits
Authentication
PLCP Service Data Unit (PSDU)
Logical Link Control (LLC)
Physical Medium Dependent (PMD)
5. Carry the actual data that is passed down from the higher-layer protocols
Announcement traffic indication message (ATIM)
Beacon Management Frame
Data Frames
Deauthentication
6. The upper portion of the Data-link layer is the IEE 802.2 Logical Link Control (LLC) sublayer - which is identical for all 802-based networks - although not used by all IEEE 802 networks.
Logical Link Control (LLC)
Traffic Indication Map (TIM)
Basic Rates
Unscheduled Automatic Power Save Delivery (U-APSD)
7. Used when stations have enabled power save mode. The TIM is a list of all stations that have undelivered data buffered on the AP waiting to be delivered. Every beacon will include the AID of the station until the data is delivered.
Physical Medium Dependent (PMD)
MAC Service Data Unit (MSDU)
Disassociation
Traffic Indication Map (TIM)
8. The upper portion of the physical layer. PLCP prepares the frame for transmission by taking the frame from the MAC sublayer and creating the PLCP Protocol Data Unit (PPDU)
MAC Service Data Unit (MSDU)
Physical Layer Convergence Procedure (PLCP)
Direct probe request
Scheduled Automatic power save delivery (S-APSD)
9. A special type of TIM that is used to ensure that all stations are awake when multicast or broadcast traffic is sent
Probe response
Integration Services (IS)
PLCP Service Data Unit (PSDU)
Delivery traffic indication message (DTIM)
10. Is the simpler of the two 802.11 authentication methods. It provides authentication without performing any type of client verification. It is essentially an exchange of hellos between the client and the AP.
Null Probe Request
WMM-PS (Power Save)
Power Save Multi Poll (PSMP)
Open System Authentication
11. A mechanism that performs a NAV distribution and helps to prevent collisions from occurring. This NAV distribution reserves the medium prior to the transmission of the data frame. RTS/CTS can be used to discover hidden node problems. RTS/CTS is one o
Unscheduled Automatic Power Save Delivery (U-APSD)
Active Scanning
Request to send/Clear to send (RTS/CTS)
Shared Key Authentication
12. Power MGMT method defined for use by HT radios. PSMP is an extension of automatic power save delivery (APSD) that was defined by the 802.11e amendment
Power Save Multi Poll (PSMP)
Null Probe Request
Scheduled Automatic power save delivery (S-APSD)
Logical Link Control (LLC)
13. Enables delivery of MSDU's between the distribution system (DS) and a non-IEEE-802.11 LAN via a portal
Information fields
Integration Services (IS)
MAC Protocol Data Unit (MPDU)
Active Mode
14. More complexed of the two 802.11 Auth methods. Shared Key authentication uses WEP to authenticate client stations and requires that a static WEP key be configured on both the station and the AP. In addition to WEP being mandatory - authentication wil
Association
Passive Scanning
Shared Key Authentication
Probe request
15. MGMT frame that is transmitted during active scanning. After a client station sends a probe request AP's that hear the probe request will send a probe response - notifying the client of the AP's presence. The information that is contained inside the
Association Identifier (AID)
Short interframe space (SIFS)
Unscheduled Automatic Power Save Delivery (U-APSD)
Probe response
16. An enhanced power-MGMT method introduced by IEEE 802.11e amendment. The Wi-Fi Alliance's WMM power save (WMM-PS) certification is based on U-APSD
Unscheduled Automatic Power Save Delivery (U-APSD)
Management Frames
Active Mode
Association
17. In order for a station to be able to connect to an AP - it needs to first discover an AP. Active scanning is one of the methods that stations use to discover AP's. The station and access point will exchange probe requests and probe responses to estab
Probe response
Active Scanning
MAC Protocol Data Unit (MPDU)
CTS-to-Self
18. A notification frame used to terminate an authentication. Because authentication is prerequisite for association - disassociation will also occur. Deauthentication cannot be refused by either party
Passive Scanning
Deauthentication
Reassociation
Physical Layer Convergence Procedure (PLCP)
19. An enhanced power-management method introduced by 802.11e amendment.
Automatic Power Save Delivery (APSD)
Announcement traffic indication message (ATIM)
Traffic Indication Map (TIM)
Probe request
20. Default power management mode for most 802.11 stations. When a station is set for active mode - the wireless station is always ready to transmit or receive data. Active mode is sometimes referred to as Continuous aware mode - and it provides no batte
Data Frames
Active Mode
Deauthentication
Short interframe space (SIFS)
21. Help with the delivery of data frames. Control frames must be able to be heard by all stations; therefore - they must be transmitted at one of the basic rates. Control frames are also used to clear the channel - acquire the channel - and provide unic
Association
Control Frames
MAC Service Data Unit (MSDU)
Direct probe request
22. A bit in the 802.11 MAC header that is used by the client station to notify the AP that the station is going into Power Save Mode
Open System Authentication
Automatic Power Save Delivery (APSD)
Probe response
Power Management Bit
23. The set of data rates that a client station must be capable of communicating with in order to successfully associate with an AP. Basic rates are required rates with a BSS.
Active Scanning
Basic Rates
Power Save Mode
Short interframe space (SIFS)
24. Authentication is the verification of user identity and credentials. Users must ID themselves and present credentials such as usernames and passwords or digital certificates. More-secure authentication systems exist that require multifactor authentic
Authentication
Information elements
Active Scanning
Spatial multiplexing power save (SM Power Save)
25. After a station has authenticated with the AP the next step is for it to associate with the AP. When a client station associates - it becomes a member of a BSS. Association means that the client station can send data through the AP and on to the Dist
Integration Services (IS)
Probe response
Control Frames
Association
26. When a client station decides to roam to a new AP - it will send a reassociation request frame to the new AP. It is called a reassociation not because it is reassociating to the AP - but because it is reassociating to the SSID of the wireless network
Probe request
Control Frames
Reassociation
Direct probe request
27. Unit of data at the Data-Link Layer
Spatial multiplexing power save (SM Power Save)
Logical Link Control (LLC)
Frame
Null Probe Request
28. Equivalent to the MPDU. The MAC layer referes to the frame as the MPDU - while the Physical layer refers to this same exact frame as the PSDU
Direct probe request
PLCP Service Data Unit (PSDU)
Information fields
Active Mode
29. A unicast frame that is used in an IBSS network when Power Save Mode is enabled. If a station has buffered data for another station it will send an ATIM frame to the other station - informing it that it must stay awake until the next ATIM window so t
WMM-PS (Power Save)
Announcement traffic indication message (ATIM)
PLCP Protocol Data Unit (PPDU)
Direct probe request
30. Optional mode for 802.11 stations. A wireless station can shut down some of the transceiver components for a period of time to conserve power. The station indicates that it is using Power Save Mode by changing the value of the Power Mgmt field to 1
Short interframe space (SIFS)
Announcement traffic indication message (ATIM)
Scheduled Automatic power save delivery (S-APSD)
Power Save Mode
31. Any time a station associates to an AP - the station receives an AID. The AP uses this AID to keep track of the stations that are associated and the members of the BSS.
Automatic Power Save Delivery (APSD)
Reassociation
Association Identifier (AID)
Shared Key Authentication
32. Variable-length fields that are optional in the body of management frame
Frame check sequence (FCS)
MAC Service Data Unit (MSDU)
Information fields
Information elements
33. In order for a station to be able to connect to an AP - it needs to first discover an AP. Passive scanning involves the client station listening for beacon frames that are continuously being sent by the AP.
Delivery traffic indication message (DTIM)
Deauthentication
Frame check sequence (FCS)
Passive Scanning
34. The extra characters added to a frame and used for error detection and correction
Active Scanning
Announcement traffic indication message (ATIM)
Frame check sequence (FCS)
Basic Rates
35. MGMT frame that is transmitted during active scanning. A client station that is looking for an SSID sends a probe request. AP's that hear the probe request will send a probe response - notifying the client of the AP presence. If a client station rece
MAC Service Data Unit (MSDU)
Direct probe request
Probe request
Automatic Power Save Delivery (APSD)
36. Majority of the frame types in an 802.11 network. Used by wireless stations to join and leave the network. Another name is Management MAC Protocol Data Unit MMPDU. Mgmt frames do not carry any upper-layer info. There is no MSDU encapsulated in the MM
Traffic Indication Map (TIM)
Frame
Logical Link Control (LLC)
Management Frames
37. A short gap or period of time that is used during transmission of data
Passive Scanning
Short interframe space (SIFS)
Unscheduled Automatic Power Save Delivery (U-APSD)
Beacon Management Frame
38. An enhanced power MGMT method introduced by the IEEE 802.11e amendment
Scheduled Automatic power save delivery (S-APSD)
Request to send/Clear to send (RTS/CTS)
Power Save Mode
Management Frames
39. A notification frame used to terminate an association. A polite way of terminating the association. Disassociation cannot be refused by either party
Power Management Bit
Disassociation
Integration Services (IS)
Short interframe space (SIFS)
40. An 802.11 frame. The components include a MAC header - an MSDU (Data Payload) and the trailer
Deauthentication
Short interframe space (SIFS)
Direct probe request
MAC Protocol Data Unit (MPDU)
41. The MSDU contains data from the LLC and Layers 3-7. A simple definition of the MSDU is the data payload that contains the IP packet plus some LLC data
Traffic Indication Map (TIM)
MAC Service Data Unit (MSDU)
Frame
Automatic Power Save Delivery (APSD)
42. Probe request with specific SSIC
Authentication
Probe request
Passive Scanning
Direct probe request
43. One of the most important 802.11 frame types. Commonly referred to as the beacon. Beacons are essentially the heartbeat of the wireless network. They are sent only by the AP of a BSS. Client stations transmit beacons only when participating in an IBS
Authentication
Automatic Power Save Delivery (APSD)
Beacon Management Frame
Association Identifier (AID)
44. When the PLCP receives the PSDU - it prepares it to be transmitted and creates the PPDU. The PLCP adds the preamble and PHY header to the PSDU
Delivery traffic indication message (DTIM)
PLCP Protocol Data Unit (PPDU)
Disassociation
Integration Services (IS)
45. Fixed-length mandatory fields in the body of management frame.
Power Save Mode
Disassociation
Reassociation
Information fields
46. The Wi-Fi alliance oversees the WMM-PS (Power Save) certification - which uses 802.11e mechanisms to increase the battery life via advanced power-saving mechanisms. The Wi-Fi Alliance's WMM Power Save certification is based on automatic power save de
WMM-PS (Power Save)
Power Save Mode
Power Management Bit
Deauthentication