300-425 practice questions 171–180

1. Question 171 · 245 in bank

   An enterprise is using the wireless network as the main network connection for corporate users and guests. To ensure wireless network availability, two standalone controllers are installed in the head office. APs are connected to the controllers using a round-robin approach to load balance the traffic. After a power cut, the wireless clients disconnect while roaming. An engineer tried eping from the controller but fails. Which protocol needs to be allowed between the networks that the controllers are installed?

   • AIP Protocol 67
   • BIP Protocol 77
   • CIP Protocol 87
   • DIP Protocol 97

   Show answer

   Answer: D

   Explanation

   • "If you have a firewall b/w your mobility group members, open UDP port 16666 and IP protocol 97. If you are using encrypted mobility, open UDP port 5246 and 5247" https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/m_configuring_mobility_groups.pdf

   Source: Adapted from community discussion — NoWiresIncluded

   References

   • Cisco documentation
   • Cisco documentation

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2. Question 172 · 245 in bank

   Select 3

   Which three pieces of equipment are needed to conduct a fully measured wireless survey? (Choose three.)

   • APoE battery
   • Bspirit level
   • Caccess point
   • Dtall tripod
   • Egoggles
   • Fladder

   Show answer

   Answer: ACD

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3. Question 173 · 245 in bank

   A customer called with a requirement that internal clients must be on different subnets depending on the building they are in. All APs are operating in local mode and will not be modified, and this is a single controller solution. Which design approach creates the desired result?

   • ACreate FlexConnect groups, place the access points in, and set the correct VLAN to SSID mapping based on location.
   • BCreate mobility anchors for the SSID, and on the controller under the internal SSID, create a foreign map to the desired VLAN based on location.
   • CCreate AP groups for each desired location, map the correct VLANs to the internal SSID, and add the APs for that location.
   • DCreate an SSID, place it to the desired VLAN under WLANs, and configure 802.1x in ISE to assign the correct VLAN based on the SSID from which the client is authenticating.

   Show answer

   Answer: C

   Explanation

   I'm 3 hours from the exam. I now believe my comment above is incorrect. (I'm only human! :) The question clearly says, the APs won't be changed from Local Mode, so they can't participate in FlexConnect Groups as that requires a mode change from Local on the APS. I'm still not sure about the answer, but mobility anchors need more than one controller, and who knows if this customer has ISE? So I think the displayed answer is correct, C.

   Source: Adapted from community discussion — HealthyGeneral

   References

   • Cisco documentation
   • Cisco documentation

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4. Question 174 · 245 in bank

   An engineer is designing a network deployment for a college with six buildings. Each building must have a WLC located in the IDF to support the APs. The wireless clients should be able to roam between the APs and the controllers. Which type of wireless architecture should be used?

   • Acloud
   • Bautonomous
   • Ccentralized
   • Ddistributed

   Show answer

   Answer: D

   Explanation

   Answer is C - Cloud-based architecture has controllers in the cloud, not on premises. Autonomous architecture means each AP is autonomous and is not managed by a WLC, distributed architecture is another term for autonomous architecture, so the same applies. Centralized architecture, a.k.a. split-MAC architecture is when all APs are managed centrally by WLCs, they do not need to be co-located. Understanding Cisco Wireless Architectures - CCNA Wireless 200-355 Official Cert Guide (2016) (apprize.best)

   Source: Adapted from community discussion — RogerTheLodger

   References

   • Cisco documentation
   • Cisco documentation

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5. Question 175 · 245 in bank

   A wireless engineer is designing a wireless network to support real time applications over wireless. Which IEEE protocol must the engineer enable on the WLC so that neighbor list radio management packets are sent to the wireless devices?

   • A802.11w
   • B802.11r
   • C802.11i
   • D802.11k

   Show answer

   Answer: D

   Explanation

   D - The 802.11k standard helps devices search quickly for nearby APs that are available as roaming targets by creating an optimized list of channels. When the signal strength of the current AP weakens, your device will scan for target APs from this list

   Source: Adapted from community discussion — EGD

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6. Question 176 · 245 in bank

   An AP is receiving 802.11 packets on its 802.11a radio with an RSSI value of -77 dBm. The current AP is part of an AP group that has been assigned an RF profile with RX-SOP set to Medium for 802.11a. Which action does the AP take with the packets?

   • AAll frames are classified as non-Wi-Fi frames and are not decoded by the 5 GHz radio.
   • BFrames are decoded by the 2.4 GHz radio.
   • CAll frames are classified as non-Wi-Fi frames and are not decoded by the 2.4 GHz radio.
   • DFrames are decoded by the 5 GHz radio.

   Show answer

   Answer: D

   Explanation

   My opinion is D: .11a radio means we are at 5Ghz. RxSOP Medium setting means signal lower than -78dBm is ignored. So -77dBm is normally decoded by 5G radio https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/configuration-guide/b_cg81/b_cg81_chapter_010001111.pdf

   Source: Adapted from community discussion — walacky

   References

   • Cisco documentation
   • Cisco documentation

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7. Question 177 · 245 in bank

   What is the recommended cell overlap when designing a wireless network for Cisco Hyperlocation?

   • A20%
   • B30%
   • C40%
   • D50%

   Show answer

   Answer: A

   Explanation

   https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-2/b_hyperLocation_best_practices_and_troubleshooting_guide.html Some basic guidelines on Site Surveys or deployments are: Try to maintain consistent -65 dBm RSSI for data, voice, video, location In order to achieve the best accuracy results, A site survey is recommended for best accuracy results 20% cell overlap for optimized roaming and location calculations A good rule of thumb is 1 Access Point per 2,500 square feet (best performance) or more, but AP density should be determined through a Site Survey. For high density applications, it is recommended to add an additional AP in the middle of dense areas

   Source: Adapted from community discussion — skh

   References

   • Cisco documentation

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8. Question 178 · 245 in bank

   Select 2

   

   Refer to the exhibit. Which two statements about Cisco Prime Infrastructure are true? (Choose two.)

   • AIt presents the recommended number of APs for the selected coverage area based on the selections made.
   • BPlanning mode requires a special license in Cisco Prime Infrastructure.
   • CIt shows the map editor feature in Cisco Prime Infrastructure.
   • DControllers must be synchronized with Cisco Prime Infrastructure for planning mode to work.
   • EIt shows the planning mode feature in Cisco Prime Infrastructure.

   Show answer

   Answer: AE

   Explanation

   A and E RTFM Use Planning Mode to Calculate Access Point Coverage Requirements Prime Infrastructure planning mode lets you calculate the number of access points (APs) required to cover an area by placing fictitious APs on a map and viewing the coverage area. Based on the throughput specified for each protocol (802.11a/n or 802.11b/g/n), planning mode calculates the total number of APs required to provide optimum coverage in your network. https://www.cisco.com/c/en/us/td/docs/net_mgmt/prime/infrastructure/3-2/user/guide/bk_CiscoPrimeInfrastructure_3_2_0_UserGuide/bk_CiscoPrimeInfrastructure_3_2_0_UserGuide_chapter_0111.html

   Source: Adapted from community discussion — rrahim

   References

   • Cisco documentation

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9. Question 179 · 245 in bank

   Select 2

   An engineer is designing a wireless deployment for a university auditorium. Which two features can be used to help deal with the issues introduced by high AP count? (Choose two.)

   • ATSPEC
   • BRXSOP
   • CTPC
   • DLSS
   • EDFS

   Show answer

   Answer: BC

   Explanation

   should be (RXSOP) and (TPC) as per definitions: TPC – Transmit Power Control, sets to power to determine the cells boundary RXSOP – The higher the RX-SOP level, the less sensitive the radio is and the smaller the receiver cell size will be As for the other options: TSPEC – Traffic Specification, this is a QoS feature to prioritise traffic LSS – Location Specific Service, has to do with mDNS and Bonjour DFS – Dynamic Frequency Selection, is used to back off of radar bands in case radar signals are detected

   Source: Adapted from community discussion — skh

   References

   • Cisco documentation
   • Cisco documentation
   • cisco.com documentation

   Next question

10. Question 180 · 245 in bank

    A wireless engineer is designing a wireless network to support real time applications over wireless. Which IEEE protocol must the engineer enable on the WLC so that the number of packets that are exchanged between an access point and client are reduced and fast roaming occurs?

    • A802.11w
    • B802.11r
    • C802.11i
    • D802.11k

    Show answer

    Answer: B

    Explanation

    802.11r reduces the number of packets that are exchanged between the client and an AP. This means the roam itself occurs faster because the AP already has the client authentication credentials cached, resulting in fewer packets required between the client and the AP. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/RToWLAN/CCVP_BK_R7805F20_00_rtowlan-srnd/CCVP_BK_R7805F20_00_rtowlan-srnd_chapter_0101.html

    Source: Adapted from community discussion — skh

    References

    • Cisco documentation

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300-425 practice, question 171. 245 questions available.