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  5. HCIA-WLAN V3.0 Questions and Answers

H12-311_V3.0 HCIA-WLAN V3.0 Questions and Answers

Questions 4

The MEth0/0/1 interface of AC6605 is used for in-band network management. The default address is: 192.168.1.1/24, and it cannot be modified.

Options:

A.

True

B.

False

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Questions 5

Radio frequency mainly uses spread spectrum technology. Which of the following technologies belong to spread spectrum technology ()? (Select 2 Answers)

Options:

A.

FHSS

B.

DSSS

C.

QPSK

D.

OFDM

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Questions 6

802.11 There are three frame types, namely (). (Select 3 Answers)

Options:

A.

Data Frame

B.

Control frame

C.

Business frame

D.

Management frame

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Questions 7

The 802.11 physical layer standard defines some common operations on the physical layer of wireless networks: such as QoS, security, and roaming operations.

Options:

A.

True

B.

False

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Questions 8

To obtain better coverage, try to use AP Signal can ( ) Through the wall.

Options:

A.

vertical

B.

parallel

C.

45°

D.

60°

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Questions 9

According to the following output, the correct statement below is ().

display version

Huawei Versatile Routing Platform Software

VRP (R) software, Version 5.70 (AC6605 V200R001C00)

Copyright (C) 2003-2012 Huawei TECH CO., LTD

Quidway AC6605-PWR Routing Switch uptime is 0 week, 1 day, 23 hours, 33 minutes

H852V26S 0(Master): uptime is 0 week, 1 day, 23 hours, 33 minutes

512M bytes DDR Memory

128M bytes FLASH

Check the running status of the AC6605.

(Select 3 Answers)

Options:

A.

display version, you can see that the VRP version number of the current device is 5.70

B.

At present, the equipment has been running continuously for 1 day, 23 hours, 33 minutes

C.

At present, the device has used 512M bytes of system memory

D.

The total size of the flash memory of the device is 128M bytes

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Questions 10

The wireless LAN architecture is mainly divided into controller-based thin

Options:

A.

True

AP Architecture and traditional independent fat AP Architecture.

B.

False

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Questions 11

Which of the following 2.4GHz The frequency bands are non-overlapping

channels (). (Select 3 Answers)

Options:

A.

6 and 11

B.

3 and 8

C.

4 and 8

D.

4 and 10

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Questions 12

Which of the following descriptions of power splitters and couplers are correct is ().

Options:

A.

Power divider and coupler are equal power distribution

B.

The power divider is equal power distribution, and the coupler is unequal power distribution

C.

The power divider is unequal power distribution, and the coupler is equal power distribution

D.

Power divider and coupler are unequal power distribution

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Questions 13

The following statement about the AP access control method is incorrect ().

(Select 2 Answers)

Options:

A.

By default, the control method for AP to access AC is non-authentication

B.

By configuring the AP in an offline state, authentication is required to automatically access

C.

The configuration whitelist can be authenticated based on MAC or SN

D.

If MAC authentication is used for AP access control, APs outside of the MAC authentication list can also go online after manual confirmation

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Questions 14

For outdoor WLAN Cover, the following statement is correct ().

(Select 3 Answers)

Options:

A.

The higher the antenna gain, the stronger the antenna directivity, and the weaker the radiation gain directly below the antenna

B.

The feeder interface must match the selected antenna

C.

The length of the feeder must not exceed 2 rice

D.

Outdoor antennas should not blindly pursue high gain

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Questions 15

802.11 The parameter used in the frame to check the integrity of the received frame is ()

Options:

A.

Frame Control

B.

Duration

C.

FCS

D.

Sequence control bit

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Questions 16

The following description of the classification and functions of Huawei APs, the correct statement is ().

(Select 3 Answers)

Options:

A.

AP6010SN and AP6010DN are indoor APs

B.

AP6310SN is an indoor distributed AP

C.

AP6510DN and AP6610DN are both outdoor APs

D.

AP6610DN is a gigabit fiber interface, so it cannot be directly connected to AC6605

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Questions 17

The following is for thin AP Is the description correct ()?

Options:

A.

thin AP Also known as wireless router

B.

thin AP Because of lack of function, is gradually getting fat AP replace

C.

thin AP Cannot be configured separately, must be used in conjunction with the wireless controller

D.

thin AP can be realised 802.1X Authentication, encryption and other functions, others such as QoS, Roaming functions are implemented on the wireless controller

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Questions 18

Used as AP and AC Establish CAPWAP tunnel VLAN What is it VLAN ()?

Options:

A.

manage VLAN

B.

Serve VLAN

C.

user VLAN

D.

Certification VLAN

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Questions 19

Among the following options, which factors will cause users to be unable to search for wireless network signals ()? (Select 2 Answers)

Options:

A.

AP Configured 5G Priority, leading to 2.4G Wireless client cannot find the signal

B.

The user's wireless network card is not enabled or the hardware switch of the wireless network card is not turned on

C.

The wireless controller is equipped with user isolation function

D.

The user's wireless network card driver is abnormal

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Questions 20

For outdoor long-distance point-to-point backhaul, the antenna of () should be selected.

Options:

A.

High gain, small lobe width

B.

High gain, large lobe width

C.

Omnidirectional

D.

Low gain, large lobe width

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Questions 21

WLAN What are the working frequency bands ()? (Select 2 Answers)

Options:

A.

2 GHz

B.

5 GHz

C.

5.4 GHz

D.

2.4 GHz

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Questions 22

What are the general methods to solve co-channel interference (). (Select 3 Answers)

Options:

A.

adjust AP Transmit power, adjust antenna feeder

B.

Reasonable frequency reuse to ensure that the same channel does not appear in the same or adjacent coverage areas

C.

Use omnidirectional antennas for coverage

D.

Use obstacles for natural isolation

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Questions 23

The lobe width is a very important parameter commonly used in directional antennas. It refers to the width of the antenna's radiation pattern below the peak (.)dB The angle of the premises

Options:

A.

3

B.

4

C.

5

D.

6

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Questions 24

exist WDS In the networking, it is connected to AC connected AP What is usually called ()?

Options:

A.

Leaf AP

B.

Middle AP

C.

Master AP

D.

Root AP

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Questions 25

User number 300 People, concurrency rate 70% , Terminal support 2.4GHz and 5GHz Frequency band, in accordance with each AP Maximum number of dual-band access users40 people

Consider, need at least () AP Able to meet capacity requirements?

Options:

A.

5

B.

6

C.

7

D.

8

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Questions 26

for CAPWAP Agreement, the error described below is ().

Options:

A.

AC And thin AP Transfer protocol

B.

thin AP Transmission protocol with wireless client

C.

Depend on CAPWAP Working group development CAPWAP

D.

The formulation of the agreement has absorbed the useful features of other agreements

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Questions 27

Which modulation method is the picture below ()?

Options:

A.

AM

B.

FM

C.

phase modulation

D.

Wave modulation

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Questions 28

What frame does the wireless client passively scan to obtain the surrounding wireless network information ()?

Options:

A.

Beacon frame

B.

Probe Request frame

C.

Authentication frame

D.

Association Request frame

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Questions 29

Barker Code is a 11 Bit sequence (e.g. 10110111000 ), there are advantages in wireless transmission, which can effectively reduce interference, but it reduces efficiency.

Options:

A.

True

B.

False

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Questions 30

802.11n Standard uses dual band (2.4GHz and 5GHz ), the theoretical transmission rate can reach up to 300Mbps, The actual test rate can reach arrive 100Mbps above.

Options:

A.

True

B.

False

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Questions 31

When coverage area 2.4GHz Frequency band 1 When channel interference is large and severe, adjust the device to 3 Channel, can effectively reduce interference.

Options:

A.

True

B.

False

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Questions 32

create radio-profile Must be bound wmm-profile Only possible, otherwise there will be configuration errors.

Options:

A.

True

B.

False

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Questions 33

As a guarantee WLAN There will be no interference between the various channels of the network, which of the following frequency bands belong to China5.8GHz Use frequency band()? (Select 2 Answers)

Options:

A.

149

B.

151

C.

153

D.

155

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Questions 34

exist PoE Of terms, AP What does it belong to ()?

Options:

A.

PSE

B.

PD

C.

PI

D.

PSU

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Questions 35

For the polarization of electromagnetic waves, which of the following descriptions is correct is (). (Select 3 Answers)

Options:

A.

The antenna radiates electromagnetic waves to the surrounding space

B.

The polarization of the antenna refers to the direction of the magnetic field strength formed when the antenna radiates

, The direction of the electric field changes according to a certain rule

C.

If the electric field direction of the electric wave is perpendicular to the ground, we call it a vertically polarized wave

D.

If the transmitting antenna is circularly polarized, the receiving antenna must also be circularly polarized, and the polarization direction of the two must be the same.

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Questions 36

802.11b is a protocol based on Orthogonal Frequency Division Multiplexing (OFDM for short) technology

Options:

A.

True

B.

False

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Questions 37

How to set the condition of switching trigger (). (Select 2 Answers)

Options:

A.

when STA Yohara AP Start switching after reaching a certain distance

B.

Set current AP With neighbors AP Signal strength ratio, switch when reaching the threshold

C.

Check the packet loss rate and start the handover when the packet loss rate reaches a certain value

D.

Yohara AP Start the switch when the network speed is very slow during association

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Questions 38

802.11n exist 20M How many sub-carriers can be used to transmit data in the mode ()?

Options:

A.

48

B.

52

C.

54

D.

56

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Questions 39

When a hardware failure occurs in an AP in the network, in order to avoid data reconfiguration, the user can quickly complete the AP replacement by configuring the AP.

replace.

Options:

A.

True

B.

False

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Questions 40

Which of the following options are the basic functions of configuring Huawei wireless

controllers ()? (Select 3 Answers)

Options:

A.

Configuration AC-ID

B.

Configuration Radio template

C.

Configuration AC Country code

D.

Configuration AC of WLAN Source interface

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Questions 41

About Huawei WLAN Description of the characteristics of the product, the following statement is correct ().

Options:

A.

Wireless controllers can achieve high availability through stacking

B.

Huawei AP The radio frequency tuning function is divided into global tuning and local tuning. The local tuning is AP Done independently

C.

WLAN The switching threshold of load balancing has two configurations based on the number of users and the number of sessions.

D.

After dual-link backup is configured, if the user adopts the tunnel forwarding mode, even if it is active AC User services will not be interrupted after failure and restart

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Questions 42

According to the following configuration example, the following statement is correct ().

[AC] dhcp enable

[AC] interface VLANif100

[AC-VLANif100] ip address 10.1.100.1 24

[AC-VLANif100] dhcp select interface

[AC-VLANif100] quit

Options:

A.

The DHCP service is already enabled by default in the global mode, so dhcp enable does not need to be configured

B.

The dhcp select interface command is to enable the DHCP client function on the VLAN 100 interface

C.

If VLAN100 is a user VLAN, after the user receives the address, the gateway is 10.1.100.1 and the mask is 255.255.255.0

D.

If VLAN100 is the management VLAN where the AP is located, the option 43 field in the DHCP message that the AP will receive should be 10.1.100.1

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Questions 43

The following description of TKIP encryption is wrong ().

Options:

A.

The length of IV used in TKIP encryption is 24 bits

B.

TKIP encryption uses the same encryption algorithm as WEP encryption

C.

The motivation for developing TKIP encryption is to upgrade the security of the old WEP hardware

D.

TKIP encryption adds the mechanism of Key generation, management and transmission

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Questions 44

Regarding the functional characteristics of AP6010SN, which of the following statements is correct is ().

(Select 2 Answers)

Options:

A.

AP6010SN is an indoor distributed AP, which only supports working in the 2.4GHz frequency band

B.

AP6010SN has an Ethernet interface and supports 802.3af PoE power supply standard

C.

AP6010SN supports WDS function, which can realize point-to-point and point-to-multipoint wireless bridging

D.

AP6010SN not only has a built-in antenna, but also an external antenna, which is very convenient

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Exam Code: H12-311_V3.0
Exam Name: HCIA-WLAN V3.0
Last Update: Apr 23, 2024
Questions: 297

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