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JN0-451
Mist AI - Specialist (JNCIS-MistAI) Questions and Answers

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Questions # 1:

Click the Exhibit button.

Question # 1

Referring to the exhibit, which two statements are correct? (Choose two.)

Options:

The WLAN with SSID NETGEAR24 will cause adjacent channel interference.

The WLAN with SSID Bob24WiFi will cause adjacent channel interference.

The WLAN with SSID Verizon-5G_Tuna will cause adjacent channel interference.

The WLAN with SSID Eero1234 will cause adjacent channel interference.

Answer

A, B

Explanation

The WLANs with SSIDs NETGEAR24 and Bob24WiFi will cause adjacent channel interference because they are using overlapping channels in the 2.4 GHz frequency band.

Questions # 2:

You are deploying multiple Mist APs across many sites in your network. You must ensure that you apply consistent WxLAN and WLAN policies across all sites within the same organization.

Which configuration object should be used to accomplish this behavior?

Options:

site labels

an RF template

a device profile

a config template

Answer

Explanation

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide1, a config template is a configuration object that can be used to apply consistent WxLAN and WLAN policies across all sites within the same organization. A config template can be applied to a site group, which is a collection of sites that share common attributes.

References: https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-2/config-guide/b_wl_17_2_cg/config_templates.html

Questions # 3:

Which two statements correctly describe an extended service set (ESS)? (Choose two.)

Options:

Each BSS within the ESS share a common BSSID.

Each BSS within the ESS has its own unique BSSID.

The SSID is common across all BSSs within the ESS.

The SSID is unique across all BSSs within the ESS.

Answer

B, C

Explanation

According to the Lecture 3 - Radio Frequency and Antenna Fundamentals - Part 2 document2, an extended service set (ESS) is a group of basic service sets (BSSs) that share a common SSID and are connected by a distribution system (DS). Each BSS within the ESS has its own unique BSSID, which is the MAC address of the AP.

References: http://faculty.georgebrown.ca/~jolenewa/courses/comp3049-intermediate-wirel/lecture-3—radio-frequency.pdf

Questions # 4:

Which access points (APs) will be considered for inclusion in the AP Offline Marvis Action?

Options:

all APs assigned to sites that have connected to the cloud previously

all APs assigned to sites

all APs in inventory

all purchased APs

Answer

Explanation

The AP Offline Marvis Action will consider all APs assigned to sites that have connected to the cloud previously for inclusion. So the correct answer is A. all APs assigned to sites that have connected to the cloud previously.

Questions # 5:

Which two SLEs measure the amount of time that it takes for a process to complete? (Choose two.)

Options:

roaming

AP uptime

throughput

time to connect

Answer

A, D

Explanation

According to the Virtual Network Assistant | Juniper Networks US document3, two SLEs that measure the amount of time that it takes for a process to complete are:

Roaming, which measures how long it takes for a client to switch from one AP to another without losing connectivity.

Time to Connect, which measures how long it takes for a client to complete all steps of network access such as authentication, DHCP, and DNS.

References: https://www.juniper.net/us/en/products/cloud-services/virtual-network-assistant.html

Questions # 6:

According to the 802.11 standard, how wide are 2.4 GHz band OFDM channels?

Options:

5 MHz

22 MHz

20 MHz

3 MHz

Answer

Explanation

[Reference: https://www.cnrood.com/en/media/solutions/Wi-Fi_Overview_of_the_802.11_Physical_Layer.pdf, According to the 802.11 standard, OFDM channels in the 2.4 GHz band are 20 MHz wide., , According to the Lecture 3 - Radio Frequency and Antenna Fundamentals - Part 2 document2, OFDM channels in the 2.4 GHz band are 20 MHz wide according to the 802.11 standard., References: http://faculty.georgebrown.ca/~jolenewa/courses/comp3049-intermediate-wirel/lecture-3—radio-frequency.pdf, , , ]

Questions # 7:

In which two layers of the OSI model are WLANs located? (Choose two.)

Options:

Network

Transport

Physical

Data Link

Answer

C, D

Explanation

[Reference: https://www.controleng.com/articles/wi-fi-and-the-osi-model/, According to the Lecture 3 - Radio Frequency and Antenna Fundamentals - Part 2 document2, two layers of the OSI model where WLANs are located are:, Physical, which defines how data is encoded and transmitted over the wireless medium using radio waves., Data Link, which defines how devices access and share the wireless medium using media access control (MAC) protocols., References: http://faculty.georgebrown.ca/~jolenewa/courses/comp3049-intermediate-wirel/lecture-3—radio-frequency.pdf, , ]

Questions # 8:

Which two statements are correct about the radio frequency rule of 10s and 3s? (Choose two.)

Options:

If the signal strength increases by 3 dB, the power is doubled.

If the signal strength decreases by 10 dB, the power decreases tenfold.

If the signal strength increases by 3 dB, the power is tripled.

If the signal strength decreases by 10 dB, the power is halved.

Answer

A, C

Explanation

Text Description automatically generated with low confidence

Questions # 9:

RF templates are assigned to which Mist configuration object?

Options:

config templates

site groups

WLANs

sites

Answer

Explanation

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide1, RF templates are assigned to sites, which are logical groupings of devices based on physical location or other criteria. RF templates allow you to configure RF parameters such as channel width, transmit power, and data rates for multiple devices at once.

References: https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-2/config-guide/b_wl_17_2_cg/rf_templates.html

Questions # 10:

A user with a PSK calls you and says, “The Wi-Fi worked for a week and now it does not work.” There have not been any recent configuration changes to the network. You suspect that a time-based setting has reset the key.

In this scenario, where would you begin troubleshooting?

Options:

Site-level Pre-Shared Keys

Organization-level Pre-Shared Keys

WLAN-level Pre-Shared Keys

RADIUS Pre-Shared Keys

Answer

Explanation

In this scenario, you would begin troubleshooting by checking the WLAN-level Pre-Shared Keys.

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide1, you can configure a time-based setting for WLAN-level Pre-Shared Keys (PSKs) that will reset the key after a specified interval. This feature is useful for enhancing security and preventing unauthorized access. If a user reports that the Wi-Fi worked for a week and now it does not work, you should check the WLAN-level PSK settings and see if the key has been changed.

References: https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-2/config-guide/b_wl_17_2_cg/wlan-level-psk.html

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