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myCCNP Switch 300-115 > Wireless > Flashcards

Wireless Flashcards

1
Q

source

A

http://www.coursehero.com/flashcards/430794/CCNP-SWITCH-642-813-Wireless/

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2
Q

If an AP wants to service multiple SSIDs, what must it connect to the physical switched network with?

A

a Trunk link!

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3
Q

In regard to Wireless technology, what is an HREAP and what does it do?

A

Hybrid Remote Edge Access Point. In the event the LAP loses its connection to the WLC, it allows the users to maintain their connections without forcing the LAP to reboot in order to reconnect to a different WLC. (makes it act like an autonomous AP.)

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4
Q

When setting up the switchport, does a wireless LAP need to have a trunk port or an access port?

A

Access port! Everything else is handled trough the LWAPP/CAPWAP tunnel!

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5
Q

LAPs and WLCs come with what type of certificate in order to authenticate with one another?

A

X.509

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6
Q

The division of labor used by the Cisco Unified Wireless Network in regard to LAPs and WLCs is known as what type of architecture?

A

a Split-MAC architecture.

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7
Q

Explain Inter-controller roaming on the same IP subnet.

A

The WLCs in question will simply exchange a mobility message, where information about the client is sent from one WLC to another.

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8
Q

What network layer should a WLC be located at?

A

Distribution layer!

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9
Q

What happens when a LAP loses its connection with the WLC?

A

it will reboot and attempt to locate another WLC.

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10
Q

What is a mobility group in wireless roaming? How many WLCs with one support?

A

Mobility groups are collections of WLC that allow inter-controller roaming between members of the same group. You can have 24 WLCs.

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11
Q

What is an SSID, and if two device have different SSIDs, can they communicate?

A

Service Set Identifier, and No. SSIDs must match to communicate.

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12
Q

How many WLC can a single LAP know about.

A
  1. Primary, secondary, tertiary.
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13
Q

In 802.11 what is the amount of time called that all stations must wait before transmitting?

A

DCF interframe Space, or DIFS.

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14
Q

What are the two types of traffic that are transmitted over LWAPP/CAPWAP and which one is encrypted?

A

Control messages (encrypted!), and normal data.

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15
Q

What is an optional serve platform that can be used as a single GUI front-end to all the WLCs in a network?

A

the Wireless Control System.

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16
Q

What is the difference between an IBSS, a BSS, and an ESS?

A

-IBSS is ad-hoc.-BSS is only one AP.-ESS connects more than one AP.

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17
Q

What three things can an AP require of a wireless client before it will be allowed to communicate?

A

matching SSID, compatible wireless data rate, and Authentication credentials.

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18
Q

What is the technical term for an Ad-Hoc network?

A

Independent Basic Service Set (IBSS)

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19
Q

What wireless mode is an AP that is standalone or autonomous in?

A

Autonomous mode!

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20
Q

What has to happen for a client to roam between two WLCs that are NOT in the same mobility group?

A

They must get a new IP and their session information will be dropped.

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21
Q

Explain Inter-controller roaming on different IP subnets.

A

When a client roams into a new controller, that controller creates an Ether-IP tunnel from itself to the WLC when the clients IP natively resides. Incoming traffic then flows to the original WLC and then through the tunnel to the new WLC.

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22
Q

What is a cell and what is roaming?Define the difference between layer 2 and layer 3 roaming.

A

-A cell is an AP’s coverage area.-roaming is moving from one AP to another.-L2 roaming maintains the same IP for the client. -L3 roaming means the client must change IPs when it changes APs.

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23
Q

In simple terms, a Wireless AP is in charge of mapping a VLAN to a(n) ____?

A

SSID!

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24
Q

What is an intra-controller roam, and what happens to allow this to occur?

A

-When a client’s wireless association stays within the same controller.-The controller simply updates its tables to use the LWAPP/CAPWAP tunnel to the new LAP.

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25
Q

What does the ‘Cisco Unified Wireless Network’ suggest doing?

A

Using LAPs and WLCs to centralize certain wireless functions on a network.

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26
Q

What are the 5 steps that a LAP must do to bootstrap and become active?

A
  1. Get a DHCP IP address.2. Learn the IP of any available WLC.3. Send a join request, and receive a reply.4. Download newer software (if necessary).5. Build a secure LWAPP/CAPWAP tunnel.
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27
Q

What two types of tunnels are used by LAPs and WLCs to communucate?

A

-LWAPPs (Lightweight Access Point Protocol) (Cisco Proprietary)-CAPWAP (Control and Provisioning Wireless Access Point protocol) (standards-based)

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28
Q

Can traffic from two clients attached to the same AP pass directly through the air to the destination?

A

No, it must travel through the AP. only Ad-Hoc (IBSS) can go from source directly to destination without the AP.

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29
Q

Can WLCs support Etherchannel autonegotiation?

A

No they cannot! You must enable unconditional Etherchannel on the Switch in order to establish the Etherchannel.

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30
Q

What are the two ways that a LAP can discover the IP address of the WLC?

A

Through DHCP option 43, or if in the same broadcast domain they can talk directly to one another via broadcast.

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31
Q

What is an Anchor point and Foreign agent in inter-controller roaming?

A

-Anchor point, the WLC that a client originally joined the wireless network at.-Foreign agent, any WLC serving the client from a different subnet.

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32
Q

What does *EAPoL* stand for?

A

Extensible Authentication Protocol over LAN

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33
Q

What is *EAPoL*?

A

EAPoL is an authentication framework frequently used in wireless and point-to-point networks.

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34
Q

Which two Lightweight Access Point Protocol (LWAPP) statements are true? (Choose two) A. Layer 3 LWAPP is a UDP / IP frame that requires a Cisco Aironet AP to obtain an IP address using DHCP. B. Data traffic is encapsulated in UDP packets with a source port of 1024 and a destination port of 12223. C. Data traffic is encapsulated in TCP packets with a source port of 1024 and destination port of 12223. D. Control traffic is encapsulated in UDP packets with a source port of 1024 and a destination port of 12223.

A

Answer: A and D

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35
Q

Which statement about the Lightweight Access Point Protocol (LWAPP) is true? A – LWAPP encrypts control traffic between the AP and the controller. B – LWAPP encrypts user traffic with a x.509 certificate using AES-CCMP. C – LWAPP encrypts both control traffic and user data. D – When set to Layer 3, LWAPP uses a proprietary protocol to communicate with the Cisco Aironet APs.

A

Answer: A

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36
Q

LWAPP is meant to be a network protocol for access points that also provides for centralized management. Which issue or set of issues does the Lightweight Access Point Protocol (LWAPP) address? A. provides security by blocking communication between access points and wireless clients. B. reduction of processing in wireless controllers. C. distributed approach to authentication, encryption, and policy enforcement. D. access point discovery, information exchange, and configuration.

A

Answer: D

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37
Q

If you are a network technician, which two WLAN client utility statements do you think are true? (Choose two) A. In a Windows XP environment, a client adapter can only be configured and managed with the Microsoft Wireless Configuration Manager. B. The Microsoft Wireless Configuration Manager can be configured to display the Aironet System Tray Utility (ASTU) icon in the Windows system tray. C. The Cisco Aironet Desktop Utility (ADU) and the Microsoft Wireless Configuration Manager can both be enabled at the same time to setup WLAN client cards. D. The Aironet Desktop Utility (ADU) can be used to enable or disable the adapter radio and to configure LEAP authentication with dynamic WEP.

A

Answer: B and D

38
Q

In order to enhance worker productivity, a Cisco wireless network has been implemented at all locations. Which three WLAN statements are true? (Choose three) A. A WLAN client that is operating in half-duplex mode will delay all clients in that WLAN. B. Ad hoc mode allows mobile clients to connect directly without an intermediate AP. C. A lightweight AP receives control and configuration from a WLAN controller to which it is associated. D. WLANs are designed to share the medium and can easily handle an increased demand of channel contention.

A

Answer: A B C

39
Q

Currently in draft status at the IETF, LWAPP outlines a standard protocol to be used by switches or routers to control a group of IEEE 802.11 wireless LAN access points and make their deployment much simpler than is possible today. Which statement about the Lightweight Access Point Protocol (LWAPP) protocol is true? A. The processing of 802.11 data and management protocols and access point capabilities is distributed between a lightweight access point and a centralized WLAN controller. B. LWAPP authenticates all access points in the subnet and establishes a secure communication channel with each of them. C. LWAPP advertises its WDS capability and participates in electing the best WDS device for the wireless LAN. D. LWAPP aggregates radio management forward information and sends it to a wireless LAN solution engine.

A

Answer: A

40
Q

Question 7: Which set of statements describes the correct order and process of a wireless client associating with a wireless access point? A. 1. Client sends probe request. 2. Access point sends probe response. 3. Client initiates association. 4. Access point accepts association. 5. Access point adds client MAC address to association table. B. 1. Client sends probe request. 2. Access point sends probe response. 3. Access point initiates association. 4. Client accepts association. 5. Access point adds client MAC address to association table. C. 1. Access point sends probe request . 2. Client sends probe response. 3. Client initiates association. 4. Access point accepts association. 5. Client adds access point MAC address to association table. D. 1. Client sends probe request. 2. Access point sends probe response. 3. Client initiates association. 4. Access point accepts association. 5. Client adds access point MAC address to association table.

A

Answer: A

41
Q

You are a network technician, study the exhibit carefully. What should be taken into consideration when using the Cisco Aironet Desktop Utility (ADU) to configure the static WEP keys on the wireless client adapter? WEP.jpg A – Before the client adapter WEP key is generated, all wireless infrastructure devices (such as access points, servers, etc.) must be properly configured for LEAP authentication. B – The client adapter WEP key should be generated by the AP and forwarded to the client adapter before the client adapter can establish communication with the wireless network. C – In infrastructure mode the client adapter WEP key must match the WEP key used by the access point. In ad hoc mode all client WEP keys within the wireless network must match each other. D – The client adapter WEP key should be generated by the authentication server and forwarded to the client adapter before the client adapter can establish communication with the wireless network.

A

Answer: C

42
Q

You work as a network technician ,please study the exhibit carefully. When it attempts to register to a wireless LAN controller (WLC), what type of message is transmitted by the lightweight access point (LAP)? LAP_message.jpg A – The LAP will send both Layer 2 and Layer 3 Lightweight Access Point Protocol (LWAPP) mode discovery request messages at the same time. B – The LAP will send Layer 2 Lightweight Access Point Protocol (LWAPP) mode discovery request messages only. C – The LAP will send Layer 3 Lightweight Access Point Protocol (LWAPP) mode discovery request messages only. D – The LAP will send Layer 2 Lightweight Access Point Protocol (LWAPP) mode discovery request messages. If the attempt fails, the LAP will try Layer 3 LWAPP WLC discovery.

A

Answer: D

43
Q

Please study the exhibit carefully. Which one is true about the configuration of access point MAC addresses on the wireless client? AP_MAC.jpg A – If the wireless client is out of range of the specified access point or points it will not associate with other access points. B – Each access point MAC address that is specified must have a separate SSID configured on the GENERAL configuration tab. C – Each access point MAC address that is specified must have the same SSID configured on the GENERAL configuration tab. D – If the wireless client is out of range of the specified access point or points it can associate with other access points.

A

Answer: D

44
Q

What is the standard for WLANs?

A

802.11

45
Q

What duplex setting does 802.11 use and why?

A

half because transmitting and receiving stations use the same frequency

46
Q

What feedback mechanism does wireless use?

A

when a wireless station transmits a frame, the receiving one must send an ack

47
Q

If a wireless station needs to transmit and no other device is transmitting, what happens?

A

The station can transmit immediately and wait for an ack

48
Q

If a wireless station needs to transmit and another device is transmitting, what happens?

A

The station must wait until the frame in progress has completed, then wait a random amount of time before transmitting

49
Q

What is the DIFS?

A

The DCF interframe space- the random backoff time before a wireless set can transmit

50
Q

What is the duration time in a wireless frame?

A

Each frame transmits its expected duration time

51
Q

What is DCF?

A

Distributed coordinion function - the use of timers to prevent wireless collisions

52
Q

What is a service set?

A

A group of wireless devices that share a common SSID

53
Q

What is an IBSS?

A

the wireless clients communicate directly with no other means of connectivity such as a WAP

54
Q

What is a BSS?

A

Using a single WAP to centralize access and control over a group of wireless devices.

55
Q

What must be in common for a BSS to form?

A

matching SSID, compatible data rate, authentication credentials

56
Q

What is an ESS?

A

When the AP uplinks to an Ethernet network.

57
Q

How are multiple VLANs mapped to multiple SSIDs?

A

By using a trunk link

58
Q

What is a cell?

A

An AP’s coverage area

59
Q

What must you be sure of if AP cells overlap?

A

That they aren’t using the same frequencies.

60
Q

What is layer 2 roaming?

A

If the client maintains the same IP address as it roams between Aps. All must have same VLAN, SSID, and subnet

61
Q

What is layer 3 roaming?

A

When a client roams between Aps in different subnets

62
Q

What is a microcell?

A

When the size of a cell is intentionally reduced

63
Q

What is an autonomous mode AP?

A

When each AP stands alone within the larger network.

64
Q

What functions does a LAP perform?

A

Real-time functions such as beacons and probes, encryption and interactions with the client at L2

65
Q

What functions does a WLC perform?

A

Control functions

66
Q

How does an LAP bind with a WLC?

A

by brining up a tunnel between them to carry 802.11 related messages and client data.

67
Q

Does a WLC and a LAP need to be on the same subnet?

A

No

68
Q

What 2 tunnelling mechanisms do the LAP and WLC use to communicate?

A

LWAPP (Cisco proprietary) and CAP-WAP (standards based)

69
Q

How many tunnels exist between the LAP and WLC?

A

2 - one for control messages and one for data

70
Q

How does a LAP and a WLC authenticate between each other?

A

using digital certificates

71
Q

What are the 5 steps a LAP uses to establish communication with a WLC?

A

1-LAP gets a DHCP address, 2-LAP learns IP of available WLC, 3-LAP sends a join request to WLC and receives join reply, 4-WLC sends code image, if necessary, 5-Tunnels are created

72
Q

How does a DHCP server send WLC addresses?

A

Option 43

73
Q

What does a LAP do if it loses communication with it’s WLC?

A

Reboots and searches for a new WLC

74
Q

How does a WLC hand off a client’s association to another WLC?

A

using a mobility exchange message

75
Q

How is a WLC handoff handled when the WLCs are in different subnets?

A

by using an Ether-IP tunnel

76
Q

What is a wireless mobility group?

A

A client can roam to any WLC as long as it stays in a mobility group

77
Q

How should the switch port to which an autonomous AP be configured?

A

trunk

78
Q

How should the switch port to which a LAP be configured?

A

access

79
Q

At what layer should the WLC be connected?

A

distribution

80
Q

How should the switch port to which a WLC be configured?

A

trunk

81
Q

If the WLC connects to an Etherchannel, how should the channel be configured and why?

A

they should be an unconditional Etherchannel because the WLC can’t negotiate a channel.

82
Q

How much overlap should WAPs have?

A

10-15%

83
Q

How much overlap should a wireless repeater have?

A

roughly 50%

84
Q

What can cause a wireless client to switch between Aps?

A

missed beacons, dropped packets (max retry), weak signal (data rate switches down), an AP periodicallytries to find a stronger signal

85
Q

What are the 3 unlicensed frequencies?

A

900 MHz, 2.4Ghz, and 5-6GHz

86
Q

802.11b

A

1,2,5.5 and 11 Mbps, Channels 1/6/11, 2.4Ghz

87
Q

802.11g

A

Compatible with 802.11b, up to 54Mbps in 12 data rates, 3 channels, 2.4Ghz

88
Q

802.11a

A

up to 54Mbps, not cross-compatible, 12 to 23 clean channels, 5.8 Ghz

89
Q

WEP encryption

A

weak key rotation

90
Q

EAP encryption

A

dynamic WEP keys that change periodically

91
Q

WPA encryption

A

interim solution, uses same hardware as WEP, but uses TKIP encryption

92
Q

WPA2 encryption

A

needs hardware upgrade over WEP, uses AES encryption

myCCNP Switch 300-115 (73 decks)

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