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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. 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.
Frame check sequence (FCS)
Frame
Deauthentication
Basic Rates
2. The lower portion of the Physical layer. the PMD sublayer modulates and transmits the data as bits
Open System Authentication
Integration Services (IS)
Physical Medium Dependent (PMD)
Short interframe space (SIFS)
3. 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
Basic Rates
Beacon Management Frame
Control Frames
Power Save Mode
4. A notification frame used to terminate an association. A polite way of terminating the association. Disassociation cannot be refused by either party
Disassociation
Control Frames
Spatial multiplexing power save (SM Power Save)
Direct probe request
5. 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
Management Frames
Power Save Mode
PLCP Protocol Data Unit (PPDU)
Spatial multiplexing power save (SM Power Save)
6. 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
Null Probe Request
MAC Protocol Data Unit (MPDU)
Delivery traffic indication message (DTIM)
Unscheduled Automatic Power Save Delivery (U-APSD)
7. 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
Information elements
Traffic Indication Map (TIM)
Control Frames
Authentication
8. 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
Frame
Automatic Power Save Delivery (APSD)
Announcement traffic indication message (ATIM)
Physical Medium Dependent (PMD)
9. 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
Request to send/Clear to send (RTS/CTS)
Beacon Management Frame
Spatial multiplexing power save (SM Power Save)
Frame check sequence (FCS)
10. 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
Power Save Mode
Active Mode
Physical Layer Convergence Procedure (PLCP)
Shared Key Authentication
11. 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
Integration Services (IS)
Disassociation
Control Frames
Frame check sequence (FCS)
12. 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)
Short interframe space (SIFS)
Management Frames
Shared Key Authentication
13. The extra characters added to a frame and used for error detection and correction
MAC Protocol Data Unit (MPDU)
Active Mode
Frame check sequence (FCS)
Power Save Multi Poll (PSMP)
14. 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
MAC Service Data Unit (MSDU)
Information fields
Beacon Management Frame
Null Probe Request
15. 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
Announcement traffic indication message (ATIM)
Probe request
Deauthentication
Shared Key Authentication
16. 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
Authentication
Spatial multiplexing power save (SM Power Save)
Basic Rates
Probe request
17. Probe request with specific SSIC
PLCP Service Data Unit (PSDU)
Authentication
CTS-to-Self
Direct probe request
18. An enhanced power-management method introduced by 802.11e amendment.
Spatial multiplexing power save (SM Power Save)
Null Probe Request
Probe request
Automatic Power Save Delivery (APSD)
19. Power-saving mechanism used to allow a MIMO 802.11n device to power down all but one of it's radios
Power Management Bit
Deauthentication
Spatial multiplexing power save (SM Power Save)
MAC Protocol Data Unit (MPDU)
20. 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
Probe response
Frame
Basic Rates
Physical Layer Convergence Procedure (PLCP)
21. 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
Frame check sequence (FCS)
WMM-PS (Power Save)
Basic Rates
Open System Authentication
22. A short gap or period of time that is used during transmission of data
WMM-PS (Power Save)
Integration Services (IS)
Short interframe space (SIFS)
Association
23. Fixed-length mandatory fields in the body of management frame.
Information fields
Short interframe space (SIFS)
Data Frames
CTS-to-Self
24. 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.
Active Mode
Physical Layer Convergence Procedure (PLCP)
Passive Scanning
Frame check sequence (FCS)
25. 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
Data Frames
Passive Scanning
PLCP Protocol Data Unit (PPDU)
Basic Rates
26. 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.
Traffic Indication Map (TIM)
Disassociation
Information fields
Probe response
27. 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.
CTS-to-Self
Unscheduled Automatic Power Save Delivery (U-APSD)
Open System Authentication
Control Frames
28. 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
Automatic Power Save Delivery (APSD)
Passive Scanning
CTS-to-Self
Traffic Indication Map (TIM)
29. Enables delivery of MSDU's between the distribution system (DS) and a non-IEEE-802.11 LAN via a portal
Integration Services (IS)
Delivery traffic indication message (DTIM)
Traffic Indication Map (TIM)
PLCP Protocol Data Unit (PPDU)
30. Unit of data at the Data-Link Layer
MAC Service Data Unit (MSDU)
Null Probe Request
Frame
Active Mode
31. Carry the actual data that is passed down from the higher-layer protocols
Power Management Bit
Data Frames
Power Save Multi Poll (PSMP)
Active Mode
32. 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.
Probe request
Association Identifier (AID)
Spatial multiplexing power save (SM Power Save)
Active Mode
33. 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
Unscheduled Automatic Power Save Delivery (U-APSD)
Information fields
MAC Service Data Unit (MSDU)
WMM-PS (Power Save)
34. An enhanced power MGMT method introduced by the IEEE 802.11e amendment
PLCP Protocol Data Unit (PPDU)
Power Save Multi Poll (PSMP)
Active Mode
Scheduled Automatic power save delivery (S-APSD)
35. 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)
Active Mode
Physical Layer Convergence Procedure (PLCP)
Frame check sequence (FCS)
Traffic Indication Map (TIM)
36. 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
Authentication
Passive Scanning
Power Save Multi Poll (PSMP)
Scheduled Automatic power save delivery (S-APSD)
37. 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
Disassociation
Active Scanning
Information elements
Open System Authentication
38. 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
Physical Medium Dependent (PMD)
PLCP Service Data Unit (PSDU)
Delivery traffic indication message (DTIM)
Direct probe request
39. A special type of TIM that is used to ensure that all stations are awake when multicast or broadcast traffic is sent
Delivery traffic indication message (DTIM)
CTS-to-Self
Physical Medium Dependent (PMD)
MAC Protocol Data Unit (MPDU)
40. 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
Logical Link Control (LLC)
Association
Beacon Management Frame
Unscheduled Automatic Power Save Delivery (U-APSD)
41. 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
Direct probe request
Automatic Power Save Delivery (APSD)
Active Mode
Integration Services (IS)
42. Variable-length fields that are optional in the body of management frame
Information elements
Physical Layer Convergence Procedure (PLCP)
Frame check sequence (FCS)
Scheduled Automatic power save delivery (S-APSD)
43. 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
MAC Protocol Data Unit (MPDU)
Data Frames
Reassociation
Frame
44. An 802.11 frame. The components include a MAC header - an MSDU (Data Payload) and the trailer
Direct probe request
Probe request
MAC Protocol Data Unit (MPDU)
Information fields
45. 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
Reassociation
Beacon Management Frame
Delivery traffic indication message (DTIM)
Power Management Bit
46. Prob request management frame with no SSID information
Null Probe Request
Shared Key Authentication
MAC Service Data Unit (MSDU)
Delivery traffic indication message (DTIM)