H12-311_V3.0 Practice Exam Questions and Answers

A.  

802.11a

B.  

802.11b

C.  

802.11g

D.  

802.11n

A.  

True

B.  

False

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

A.  

Mainly responsible for transmitting data when WLAN users go online

B.  

PVID VLAN under the WLAN ESS interface

C.  

Service VLAN under the service set template

D.  

If the data tunnel is used for forwarding, user data will not be transmitted through the business VLAN business

A.  

WPA2 PSK authentication requires the user to enter a user name and password to connect

B.  

When the user performs web authentication, it is triggered by the user's http message after successfully obtaining the IP address; at this time, it is forcibly redirected to the portal server,

Go through the certification process

C.  

WPA2 uses 802.1X authentication

D.  

WAPI is China's national standard system for wireless LAN

A.  

Type for 01 Time represents data frame

B.  

Type for 10 Time represents control frame

C.  

Type for 00 Indicates reserved use

D.  

Type for 00 Time represents management

A.  

S9300 series switches

B.  

S9700 series switches

C.  

S7700 series switches

D.  

S5700 series switches

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

A.  

SIFS

B.  

IFS

C.  

DIFS

D.  

PIFS

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

A.  

WiFi

B.  

IEEE

C.  

IETF

D.  

FCC

A.  

It is easier to make network planning in the 5G frequency band

B.  

5G frequency band can provide better access capability and capacity

C.  

The connection speed between users and APs in the 5G frequency band is very fast

D.  

The transmission rate of the 5G frequency band is higher than that of the 2.4G frequency band

A.  

IBSS

B.  

BSS

C.  

ESS

D.  

NSS

A.  

The picture shows the bypass networking

B.  

Can be configured and managed on the access switch VLAN of PVID

A.  

C.  

can use AC As DHCP Server ,give AP distribute IP address

D.  

You cannot use the aggregation switch to STA distribute IP address

A.  

The user tries his best to ensure that the planning data is detailed when planning the data, which will greatly facilitate the later configuration

B.  

Before sending the configuration to the AP, the AP must be online

C.  

Configure the WMM template can be directly bound to the antenna

D.  

The WMM template is bound to the RF template

A.  

100

B.  

200

C.  

500

D.  

1000

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

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

A.  

True

B.  

False

A.  

14

B.  

13

C.  

11

D.  

3

A.  

Compared with the three-layer network, the two-layer network is more suitable for large-scale networks such as parks and stadiums.

B.  

The advantage of the three-layer network is simple configuration and easy networking

C.  

if AC The ability to process data is relatively weak, it is recommended to use bypass networking

D.  

In a direct-connected network, AP Business data can not go through AC And directly reach the upstream network

A.  

True

B.  

False

A.  

2,7,12

B.  

3,8,13

C.  

1,6,11

D.  

3,7,13

A.  

display ap online all

B.  

display ap all

C.  

display ap-type all

D.  

dispay ap-run-info all

A.  

vertical

B.  

parallel

C.  

45°

D.  

60°

A.  

BSA

B.  

ESA

C.  

SSA

D.  

TSA

A.  

AP6010DN

B.  

AP6310SN

C.  

AP6510DN

D.  

AP6610DN

A.  

Omnidirectional antenna; Omnidirectional antenna

B.  

Omnidirectional antenna; directional antenna

C.  

Directional antenna; omnidirectional antenna

D.  

Directional antenna; Directional antenna

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

A.  

cmcc (China Mobile)

B.  

ctc (China Telecom)

C.  

cuc (China Unicom)

D.  

other (other)

A.  

True

B.  

False

A.  

WiFi

B.  

WAPI

C.  

WLAN

D.  

WiMAX

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.

A.  

Leaf AP

B.  

Middle AP

C.  

Master AP

D.  

Root AP

A.  

25 MHz

B.  

20 MHz

C.  

50 MHz

D.  

22 MHz

A.  

Number of people connected in the area

B.  

Area size

C.  

Field strength and bandwidth requirements

D.  

Number of network ports

A.  

POE switch

B.  

POE switcher

C.  

Independent power adapter

D.  

RF cable

A.  

5.15~5.25GHz

B.  

5.25~5.35GHz

C.  

5.725~5.825GHz

D.  

5.725~5.850GHz

A.  

Basic service set

B.  

Basic service area

C.  

Extended service set

D.  

Extended service area

A.  

True

B.  

False

A.  

RG-8 Jumper

B.  

1/2 ”(Inch) Super flexible feeder

C.  

1/2 "(Inch) feeder

D.  

13/8 "(Inch) feeder

A.  

Gain

B.  

Lobe width

C.  

Power size

D.  

Polarization mode

A.  

AP Periodically to AC Send its associated STA Information

B.  

STA Periodically report the current associated AP Logo

C.  

AC Timed query AP Associated STA number

D.  

STA Periodically search the surrounding AP Information and through association AP Report AP Logo

A.  

5G Priority characteristics refer to 5G Client sends data first

B.  

5G After the priority is turned on, only support 2.4G The network transmission speed of the client will be slower

C.  

5G Priority request AP Is dual frequency AP Can work normally

D.  

5G Priority requires all clients to support at the same time