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

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SSID Technology can divide a wireless local area network into several sub-networks that require different authentication. Each sub-network requires independent

authentication. Only users who pass the authentication can enter the corresponding sub-network to prevent unauthorized users from entering This network.

BSSID Is actually AP of MAC Address, used to identify AP Managed BSS , In the same AP Inside BSSID and SSID One-to-one mapping.

Users can be in different SSID Roaming is realized below.

in a ESS Inside SSID Is the same, but for ESS Within each AP Corresponding BSSID Are not the same. If oneAP Can support multiple at the

same time SSID , Then AP Will assign different BSSID To correspond to these SSID .

0 dBm = 1 mW

3 dBm = 2 mW

10 dBm = 100mW

27 dBm = 500mW

True

False

AM

FM

phase modulation

Wave modulation

True

False

802.11a

802.11b

802.11g

802.11n

AP → SW3 → SW2 → AC → SW2 → SW1

AP → SW3 → SW2 → SW1

AP → AC → SW2 → SW1

AP → SW3 → SW2 → AC → SW2 → SW3 → SW2 → SW1

save ap id 1

commit ap 1

save ap 1 config

save config ap 1

802.11a

802.11b

802.11g

802.11n

The antenna radiates electromagnetic waves to the surrounding space

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

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

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.

Don't go through

Don't pass, don't pass

Pass by

Pass, not pass

1: Reset button

3: USB port

2: Port that receives PoE power

8: IoT slots

display interface

display current-configuration

display ap all

display version

When selecting the antenna gain, ensure that the beam matches the coverage area. If the coverage distance is small, select low-gain antennas with wide vertical lobes to ensure the coverage effect in the area near the antenna.

An antenna's gain quantitatively measures the degree of input power an antenna can radiate in a given direction.

An antenna's gain measures its ability to transmit and receive signals in a specific direction. It is irrelevant to the antenna model.

Antennas are passive components, and they do not amplify electromagnetic signals.

True

False

True

False

Beacon

RTS

CTS

PS-Poll

0,0

0,1

1,0

1,1

100

500

800

50

The user is currently operating on the wired side of the AC

The user is currently operating on the wireless side of the AC

According to the output, it can be concluded that the AC6605 uses a POE power supply module

To implement the related configuration of WLAN, the user must first switch to the wireless side by CTRL+Ypass

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

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

The wireless controller is equipped with user isolation function

The user's wireless network card driver is abnormal

True

False

IEEE 802.3ae

IEEE 802.3af

IEEE 802.3as

IEEE 802.3at

WPA1 PSK+TKIP/CCMP

WPA1 802.1X+TKIP/CCMP

WPA2 PSK+TKIP/CCMP

WPA2 802.1X+TKIP/CCMP

802.11a

802.11b

802.11g

802.11n

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

Go through the certification process

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

WPA2 uses 802.1X authentication

WPA only supports TKIP, an encryption technology

Classified by directivity: omnidirectional antenna, directional antenna, etc.

Classified by shape: linear antenna, planar antenna, etc.

Classified by purpose: short wave antenna, ultra short wave antenna, microwave antenna, etc.

Classified by working frequency band: communication antenna, TV antenna, radar antenna, etc.

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

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

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

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

True

False

Address 1

Address 2

Address 3

Address 4

eSight server

Client

Authenticator

Authentication server

SSID

MAC address

Encryption type

channel

RTS

CTS

ACK

PS-Poll

Frame Control

Duration

Address Bit

Fragment number

One AP Can release multiple different SSID

Multiple AP Can release the same one on SSID

One AP Configurable SSID There is no limit to the number

One AP Can release the same SSID Signal

True

False

60

2000

5000

20000

Support automatic identification of obstacles

Support the division of general coverage areas and key coverage areas

Support automatic deployment of AP locations

Support exporting standardized WLAN planning reports

True

False

Type for 01 Time represents data frame

Type for 10 Time represents control frame

Type for 00 Indicates reserved use

Type for 00 Time represents management

True

False

True

False

True

False

1645

1646

5246

5247

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

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

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

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

True

False

IBSS

BSS

ESS

NSS

Configured on the user’s gateway device ACL , Which prevents mutual access between users

AC Configured on ACL , Which prevents mutual access between users

Access AP Port isolation configured on the switch prevents mutual access between users

wireless service-set User isolation is configured on the computer to prevent mutual access between users

AM

FM

phase modulation

Wave modulation

Where the user is VLAN No configuration DHCP server

wlan-ess No configuration on the virtual interface dhcp-enable

The authentication password specified by the user is incorrect

User equipment MAC The address has been added to the blacklist

BSSID

ESSID

BSA

BSS

AP → AC → SW2 → SW1

AP → SW3 → SW2 → AC → SW2 → SW3 → SW2 → SW1

AP → SW3 → SW2 → SW1

AP → SW3 → SW2 → AC → SW2 → SW1

CTS

RTS

ACK

PS-Poll

RTS

CTS

ACK

PS-Poll

AP right AC Automatic discovery and AP&AC State machine operation and maintenance

AC right AP Perform management and business configuration delivery

STA Data encapsulation CAPWAP Tunnel forwarding

Defined Mac Layer and physical layer transmission rate

True

False

APs belonging to the same region will uniformly adjust the radio frequency channel and power

An AP can belong to two regions at the same time, so that roaming is more optimized

If there is no configuration, all APs belong to region 0 by default

AP region has three types of deployment: dense deployment, discrete deployment, and ordinary deployment.

25 MHz

20 MHz

50 MHz

22 MHz

Modify the WDS profile.

Modify the RRM profile.

Modify the SSID profile.

Modify the VAP profile.

1,2,5.5,11&6,9,12,18,24,30,36,48,54 Mbps

6, 9, 12, 18, 24, 36, 48, 54 Mbps

1,2,5.5,11&6,9,12,18,24,36,48,54 Mbps

6,9,12,18,24,30,36,48,54 Mbps

True

False

2.4GHz generally uses 1, 6, 11 three non-overlapping channels for coverage

In China, 5GHz generally has 23 non-overlapping channels available

Microwave interference will occur in the entire 2.4GHz frequency band

If the AP is dual-band, it is recommended to use the 5G priority function

True

False

WiFi

IEEE

IETF

FCC

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

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

WPA2 uses 802.1X authentication

WAPI is China's national standard system for wireless LAN

Avoid long authentication time during roaming, resulting in packet loss or even business interruption

Ensure that the user authorization information remains unchanged

Guarantee users IP The address remains unchanged

Ensure that the user's network rate remains unchanged

Frame Control

Duration

address Bit

Sequence control bit

True

False

5.15~5.25GHz

5.25~5.35GHz

5.725~5.825GHz

5.725~5.850GHz

RF template

AP template

ESS template

Planning table template

cmcc (China Mobile)

ctc (China Telecom)

cuc (China Unicom)

other (other)

True

False

20 MHz

22 MHz

5 MHz

10 MHz

Incorrect address pool configuration

Address pool exhausted

Intermediate network problem

POE Power failure

802.11f

802.11i

802.11e

802.11n

True

False

mac-auth

sn-auth

no-auth

mac-sn-auth

thin AP Also known as wireless router

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

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

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

True

False

ssid-profile name xxx

capwap source interface vlanif 100

ap auth-mode mac-auth

ap-group name xxx

AC-WLAN-view] security-profile name security-1 id 1

[AC-WLAN-sec-prof-security-1] open authentication-method open-system

[AC-WLAN-sec-prof-security-1] security-policy open

[AC-WLAN-sec-prof-security-1] quit

AC-WLAN-view] security-profile name security-1 id 1

[AC-WLAN-sec-prof-security-1] wep authentication-method open-system

[AC-WLAN-sec-prof-security-1] security-policy wep

[AC-WLAN-sec-prof-security-1] quit

AC-WLAN-view] security-profile name security-1 id 1

[AC-WLAN-sec-prof-security-1] wpa authentication-method open-system

[AC-WLAN-sec-prof-security-1] security-policy wpa

[AC-WLAN-sec-prof-security-1] quit

AC-WLAN-view] security-profile name security-1 id 1

[AC-WLAN-sec-prof-security-1] wpa2 authentication-method open-system

[AC-WLAN-sec-prof-security-1] security-policy wpa2

[AC-WLAN-sec-prof-security-1] quit

True

False

Configuration AC-ID

Configuration Radio template

Configuration AC Country code

Configuration AC of WLAN Source interface

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

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

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

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

Beacon frame

Probe Request frame

Authentication frame

Association Request frame

True

False

when STA Yohara AP Start switching after reaching a certain distance

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

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

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

Plate

paraboloid

Omnidirectional

Orientation

Point-to-point method

Point-to-multipoint

Relay bridging method

Multipoint to multipoint

True

False

Convergence layer three switches

One-arm router

AC superior

AP superior

AP Belong to the same type

AP In the same AC Under management, and AP Signal overlap

STA Can scan to each other for load balancing AP

AP The output power settings are the same

swichport hybrid

hybrid enable

port link-type hybrid

port mode hybrid

True

False

True

False

2G/3G

WLAN

Bluetooth

WiMAX