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