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ENCOR > 3 > Flashcards

3 Flashcards

1
Q

What are some ways to reduce the AP coverage area?

A

Reduce AP transmit power
Increase minimum mandatory data rate

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2
Q

Which antenna type should be used for a site-to-site wireless connection?

A

Yagi

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3
Q

What is calculated using the numerical values of the transmitter power level, cable loss, and antenna gain?

A

EIRP

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4
Q

What does the LAP send when multiple WLCs resolve the domain name during the CAPWAP discovery and join process,

A

Unicast discovery request to each WLC

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5
Q

What are the PAGP modes?

A

Desirable
Auto
On

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6
Q

Which DNS lookup does an AP perform when attempting CAPWAP discover?

A

CISCO-CAPWAP-CONTROLLER.local

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7
Q

What feature allows legacy clients in a WLAN to connect while still allowing other clients to use fast transition based on their OUIs?

A

Adaptive 802.11r

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8
Q

What are some common sources of interface for Wi-Fi networks?

A

Radar
Rogue AP

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9
Q

What two components are needed to compute SNR?

A

Noise floor
RSSI

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10
Q

What OSPF network types are compatible and allows communication through the two peering devices?

A

broadcast to non-broadcast
broadcast to broadcast
non-broadcast to non-broadcast
p2p to p2p

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11
Q

Which debugging statement allows you to see hello messages a router has sent/received on interface g1/0?

A

debug ip ospf hello

#debug condition int g1/0

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12
Q

When are multicast RPs needed?

A

To start new sessions with sources and receivers

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13
Q

What EtherChannel mode should be configured on a switch to allow the WLC to connect and increase total throughput and redundancy on the links?

A

On

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14
Q

What must match to establish OSPF neighborship?

A

Hello/dead times
Area ID
Auth type/data
Subnet
MTU size
Stub flag

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15
Q

What should you configure to elect a root port on an upstream switch?

A

Configure port priority

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16
Q

What should you configure to elect a root port on downstream switches?

A

Modify port cost

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17
Q

What is the default port priority?

A

128

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18
Q

What is the order of preference for selecting a path in BGP?

A

Weight
Local preference
AS path
Metric

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19
Q

What is the default local preference value in BGP?

A

100

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20
Q

What mechanisms can secure NTP?

A

Encrypted authentication mechanism
Access list-based restriction scheme

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21
Q

In OSPF, which LSA type points to the ASBR router?

A

Type 4

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22
Q

In OSPF, which LSA type points to the ABR router?

A

Type 3

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23
Q

Where should VTP pruning be enabled?

A

On VTP servers

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24
Q

What could cause an OSPF neighborship to be in the EXSTART/EXCHANGE state?

A

Mismatched MTU size

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25
Q

What should an engineer deploy if a customer has several small branches and wants to deploy a Wi-Fi solution with local management using CAPWAP?

A

Mobility Express

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26
Q

In what type of roaming is the anchoring feature use?

A

Layer 3

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27
Q

Does EIGRP or OSPF support unequal path load balancing?

A

EIGRP

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28
Q

What type of RP is OSPF?

A

Link state

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29
Q

What type of RP is EIGRP

A

Distance vector

30
Q

What is the EIGRP metric based on?

A

Delay and bandwidth

31
Q

What routing protocol makes it easy to segment the network logically?

A

OSPF

32
Q

In EBGP, what does the Active state mean?

A

The local router is attempting to open a TCP session with the neighboring router

33
Q

What is the default behavior of trunks?

A

To allow all VLANS

34
Q

What is weight in BGP?

A

Value assigned to prefix
Higher weight is preference
Default = 0
Locally significant

35
Q

What is local preference in BGP?

A

Used to choose outbound paths
Applies to whole AS group
Default = 100
Higher number is preference

36
Q

What NTP stratum level describes NTP servers that are directly attached to an authoritative time source?

A

Stratum 1

37
Q

How do you disable bpdu guard?

A

no spanning-tree bpduguard enable

#shut
#no shut

38
Q

What happens if controllers in a mobility group are not using the same virtual interface?

A

Roaming appears to work but hand-off does not complete and client uses connectivity for a period of time

39
Q

What is the role of the RP in PIM sparse mode?

A

The RP is the multicast router that is the root of the PIM-SM shared multicast distribution tree

40
Q

What is the process of storing controller IP addresses on an AP for later deployment called?

A

Priming

41
Q

Why would an AP join a different WLC from the one specified in option 43?

A

The AP has previously joined a controlled and has been primed with a primary, secondary, and tertiary controller

42
Q

What kind of roaming occurs if APs are connected to different WLCs?

A

Inter-controller

43
Q

What kind of roaming occurs if the APs are on the same WLC?

A

Intra-controller

44
Q

What helps LAPs with CAPWAP discovery?

A

DHCP option 43
Configure ip-helper address

45
Q

In what kind of connection in OSPF is there no DR and BDR?

A

Point-to-point

46
Q

What is dynamic channel assignment?

A

Allows client to switch from one channel to another, causes a disruption
Default time = 10 minutes

47
Q

What algorithm does EIGRP use?

A

DUAL algorithm

48
Q

In what IGP can summaries be created anywhere in the IGP topology?

A

EIGRP

49
Q

What does an RP do in PIM?

A

Send join messages toward a multicast source SPT

50
Q

How does OSPF behave after a link failure?

A

Quickly computes new path

51
Q

How does EIGRP behave after a link failure?

A

Maintains alternative loop-free backup path if available

52
Q

What commands can be used to ensure a switch will become the root bridge?

A

spanning-tree 1 root primary

#spanning-tree 1 priority {increment of 4096} default is 32768

53
Q

What does setting the DF bit do?

A

Decide if packets can be sent fragmented or not

54
Q

What mechanism does PIM use to forward multicast traffic using a pull model?

A

PIM sparse mode

55
Q

What mechanism does PIM use to forward multicast traffic using a push model?

A

PIM dense mode

56
Q

What does OSPF use to calculate metric?

A

Bandwidth only

57
Q

What is a possible cause of an EtherChannel misconfiguration that shoes no ports in the summary output?

A

Correct port members not defined

58
Q

What encryption hashing algorithm does NTP use for authentication?

A

MD5

59
Q

How is priority configured on STP?

A

In increments of 16
Default priority is 128

60
Q

What L2 security policies should be used to leverage Wi-Fi 6 speeds on the WLAN?

A

802.1x
OPEN

61
Q

What are ways an AP can discover a WLC?

A

DHCP option 43
Broadcasting on the local subnet

62
Q

What is the responsibility of a secondary WLC?

A

Registers LAPs if the primary controller fails

63
Q

What is FlexConnect?

A

A wireless solution for branch office and remote office deployments
Can tunnel traffic back to the controller when connected to the controller

64
Q

How must spanning-tree be configured if you want multiple VLANs?

A

spanning-tree portfast trunk in interface config mode

65
Q

What does BPDU filtering do?

A

Allows you to avoid transmitting BPDUs on PortFast-enabled ports that are connected to an end system

66
Q

What antenna types are omnidirectional?

A

Ceiling mount
Dipole

67
Q

What antenna types are directional?

A

Yagi
Patch directional
Parabolic dish

68
Q

How would a LAP discover a WLC within a LAN?

A

DHCP option 43

69
Q

How would a LAP discover a WLC outside of a LAN?

A

Use an IP helper address
#int vlan [int]
#ip helper-address [add]

70
Q

What is the AP decision process priority?

A
  1. WLC it has joined before
  2. Primary controller
  3. WLC with lowest number of APs

ENCOR (3 decks)

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