300-425 practice questions 181–190

1. Question 181 · 245 in bank

   How are mobility groups created, excluding mobility anchors?

   • AEach WLC must use the same mobility domain name and be defined as a peer in each other's static mobility members list.
   • BIf WLCs with HA SSO are deployed, each WLC in the WLC HA pair is considered separately as a mobility peer.
   • CThe WLCs do not have to be of the same model or type to be a member of a mobility group; however, each member should be running different software versions.
   • DA mobility group does not require all WLCs in the group to use the same virtual IP address.

   Show answer

   Answer: A

   Explanation

   Answer A is correct To create a Mobility Group, you just add WLCs to the Mobility Group Member list (of each WLC). WLCs with the same Group Name will end up in the same Mobility Group. If you add WLCs with a different Group Name to the list, they will form a different Mobility Group, but end up in the same Mobility Domain. The Mobility Domain can contain up to 3 Mobility Groups.

   Source: Adapted from community discussion — Liselot

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2. Question 182 · 245 in bank

   Select 2

   Which two considerations must a network engineer have when planning for voice over wireless roaming? (Choose two.)

   • AFull reauthentication introduces gaps in a voice conversation.
   • BRoaming time increases when using 802.1x + Cisco Centralized Key Management.
   • CRoaming occurs when the phone has seen at least four APs.
   • DRoaming occurs when the phone has reached גˆ’80 dBs or below.
   • ERoaming with only 802.1x authentication requires full reauthentication.

   Show answer

   Answer: AE

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3. Question 183 · 245 in bank

   Select 2

   When conducting a site survey for real-time traffic over wireless, which two design capabilities of smartphones and tablets must be considered? (Choose two.)

   • Ano support for 802.11ac
   • Bhigher data rates than laptops
   • Cfewer antennas than laptops
   • Dno support for 802.11r
   • Elower data rates than laptops

   Show answer

   Answer: CE

   Explanation

   "Most smartphones and tablets support 802.11. However, generally, the smartphones and tablets have fewer antennas and lower data rates than laptops" 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_01.html

   Source: Adapted from community discussion — RhJ72

   References

   • Cisco documentation

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4. Question 184 · 245 in bank

   What is the 9800 Series Wireless Controller mobility tunnel on a Cisco Catalyst 9800 controller?

   • AIt is an IPsec tunnel with control path only.
   • BIt is a CAPWAP tunnel with data path only.
   • CIt is a CAPWAP tunnel with control path and data path.
   • DIt is an IPsec tunnel with control path and data path.

   Show answer

   Answer: C

   Explanation

   Correct answer is C https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_wl_16_10_cg/mobility.html "The Cisco Catalyst 9800 Series Wireless Controller mobility tunnel is a CAPWAP tunnel with control path (UDP 16666) and data path (UDP 16667). The control path is DTLS encypted by default. Data path DTLS can be enabled when you add the mobility peer."

   Source: Adapted from community discussion — Impeg

   References

   • Cisco documentation
   • Cisco documentation

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5. Question 185 · 245 in bank

   An engineer must configure the virtual IP address on multiple controllers in a mobility group. Which rule must the engineer follow to ensure proper roaming?

   • AEnsure that the DNS entry is tied to the virtual IP address of the WLC.
   • BUse a unique IP address for each WLC.
   • CEnsure that the DNS Host Name field is defined.
   • DUse the same IP address for each WLC.

   Show answer

   Answer: D

   Explanation

   The answer is D Cisco documentation states the following: All controllers within a mobility group must be configured with the same virtual interface IP address. Otherwise, inter-controller roaming may appear to work, but the handoff does not complete, and the client loses connectivity for a period of time.

   Source: Adapted from community discussion — Alonzo_Harris

   References

   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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6. Question 186 · 245 in bank

   Guest anchoring is configured for a newly created SSID for a company. It has been noticed that the mobility tunnels are not up and that MPING fails from your foreign WLC to the anchor WLC. What is the reason that it is failing?

   • AA rule is needed at the firewall to allow UDP port 16666 for communication to work.
   • BA rule is needed at the firewall to allow UDP port 97 for communication to work.
   • CA rule is needed at the firewall to allow TCP port 97 for communication to work.
   • DA rule is needed at the firewall to allow TCP port 16666 for communication to work.

   Show answer

   Answer: A

   Explanation

   • You can test the mobility communication environment by performing mobility ping tests. These tests may be used to validate connectivity between members of a mobility group (including guest controllers). Two ping tests are available: • Mobility ping over UDP—This test runs over mobility UDP port 16666. It tests whether the mobility control packet can be reached over the management interface. • Mobility ping over EoIP—This test runs over EoIP. It tests the mobility data traffic over the management interface. • Only one mobility ping test per controller can be run at a given time.

   Source: Adapted from community discussion — Goatgirl20

   References

   • Cisco documentation

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7. Question 187 · 245 in bank

   Multiple WLCs are implemented in a high-availability configuration in a mobility group. APs are deployed with only a primary controller assigned. By default, which mobility group member controller do the orphaned APs join in the event of a failed controller?

   • Acontroller with the most available AP free license capacity
   • Bcontroller with the lowest percent of associated APs per license capacity
   • Ccontroller with the least CPU utilization over the last reporting period
   • Dcontroller with the least number of associated APs

   Show answer

   Answer: A

   Explanation

   https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-mobile/71963-apload-apfall-uwn.html "The AP then attempts to join the least loaded WLC, which is the WLC with the greatest available AP capacity."

   Source: Adapted from community discussion — ContactScott

   References

   • Cisco documentation
   • Cisco documentation

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8. Question 188 · 245 in bank

   An engineer must ensure that the wireless network accomplishes fast, secure roaming by way of caching keys on the APs. Which key caching mechanism is enabled by default on a Cisco AireOS WLC?

   • ASKC
   • BOKC
   • C802.11r
   • DCCKM

   Show answer

   Answer: B

   Explanation

   Answer is B OKC is a fast roaming technique supported by Microsoft and some Android clients. Another fast roaming method is the use of 802.11r, which is supported by Apple and few Andorid clients. OKC is enabled by default on a WLAN. This configuration enables the control of OKC on a WLAN. Disabling OKC on a WLAN disables the OKC even for the OKC-supported clients. A new configuration is introduced for each WLAN in the controller in Cisco IOS XE Amsterdam 17.2.1, to disable or enable fast and secure roaming with OKC at the corresponding AP.

   Source: Adapted from community discussion — Thomas66

   References

   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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9. Question 189 · 245 in bank

   During a client roaming event, which device is responsible for communicating the new Layer 2 EID mapping of a wireless supplicant to the fabric domain?

   • AWLC
   • BBN
   • CCP2
   • DCP1

   Show answer

   Answer: A

   References

   • Cisco documentation

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10. Question 190 · 245 in bank

    Campus users report a poor wireless experience. An engineer investigating the issue notices that in high-density areas, the wireless clients fail to switch the AP to which are automatically connected. This sticky client behavior is causing roaming issues. Which feature must the engineer configure?

    • Aoptimized roaming
    • Bload balancing and band select
    • CLayer 3 roaming
    • DLayer 2 roaming

    Show answer

    Answer: A

    Explanation

    A - "Optimized roaming resolves the problem of sticky clients that remain associated to access points that are far away" https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/configuration-guide/b_cg81/b_cg81_chapter_010001110.pdf

    Source: Adapted from community discussion — EGD

    References

    • Cisco documentation

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300-425 practice, question 181. 245 questions available.