300-430 practice questions 211–220

1. Question 211 · 294 in bank

   A network engineer observes a spike in controller CPU overhead and overall network utilization after multicast is enabled on a controller with 500 APs. Which feature corrects the issue?

   • Acontroller IGMP snooping
   • Bmulticast AP multicast mode
   • Cbroadcast forwarding
   • Dunicast AP multicast mode

   Show answer

   Answer: B

   Explanation

   With multicast -unicast, the wlc would have to make a copy for every packet before sending it to an AP. WIth lots of AP, that would give a nice spike in cpu. By enabling multicast-multcast, now the wlc sends only 1 copy to a unique choosen multicast address and all APs joining that multicast address receive the packet.

   Source: Adapted from community discussion — Citizenx

   References

   • Cisco documentation

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2. Question 212 · 294 in bank

   An engineer is configuring multicast for wireless for an all-company video meeting on a network using EIGRP and BGP within a single domain from a single source. Which type of multicast routing should be implemented?

   • AProtocol Independent Multicast Dense Mode
   • BSource Specific Multicast
   • CMulticast Source Discovery Protocol
   • DProtocol Independent Multicast Sparse Mode

   Show answer

   Answer: D

   Explanation

   seems to be the D is correct. Protocol Independent Multicast–Sparse Mode (PIM–SM or PIM) is the routing protocol most suited to get multicast routing up and running within a single domain http://www.telfor.rs/telfor2002/radovi/2-19.pdf

   Source: Adapted from community discussion — Igur

   References

   • Cisco documentation
   • Cisco documentation

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3. Question 213 · 294 in bank

   Which statement about the VideoStream/Multicast Direct feature is true?

   • AIP multicast traffic is reliable over WLAN by default as defined by the IEEE 802.11 wireless multicast delivery mechanism.
   • BEach VideoStream client acknowledges receiving a video IP multicast stream.
   • CIt converts the unicast frame to a multicast frame over the air.
   • DIt makes the delivery of the IP multicast stream less reliable over the air, but reliable over Ethernet.

   Show answer

   Answer: B

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/configuration-guide/b_cg81/multicast_broadcast_setup.html

   Source: Adapted from community discussion — Sorvahr

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4. Question 214 · 294 in bank

   Which configuration is applied to prevent the network from a Layer 2 flooding of multicast frames with a seamless transfer of multicast data to the client when roaming from one controller to another?

   • AEnable IGMPv3 on the central Layer 3 switch.
   • BEnable IGMP snooping on the WLC.
   • CEnable multicast mode on the WLC.
   • DCreate multicast groups on the central Layer 3 switch.

   Show answer

   Answer: B

   References

   • Cisco documentation

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5. Question 215 · 294 in bank

   A FlexConnect remote office deployment is using five 2702i APs indoors and two 1532i APs outdoors. When a code upgrade is performed and FlexConnect Smart AP Image Upgrade is leveraged, but no FlexConnect Master AP has been configured, how many image transfers between the WLC and APs will occur?

   • A1
   • B2
   • C5
   • D7

   Show answer

   Answer: B

   Explanation

   Correct. "A FlexConnect group can have one primary AP per AP model. If a primary AP is not selected manually, the AP that has the least MAC address value is automatically chosen as the primary AP for that model."

   Source: Adapted from community discussion — Skliffi

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6. Question 216 · 294 in bank

   An engineer is configuring multicast for two WLCs. The controllers are in different physical locations and each handles around 500 wireless clients. How should the CAPWAP multicast group address be assigned during configuration?

   • AEach WLC must be assigned a unique multicast group address.
   • BEach WLC management address must be in the same multicast group.
   • CBoth WLCs must be assigned the same multicast group address.
   • DEach WLC management address must be in a different multicast group.

   Show answer

   Answer: A

   Explanation

   I think it is A: Choose Controller > General to configure AP multicast mode (multicast or unicast) & CAPWAP multicast group address(only for multicast mode). Use private multicast IP (239.0.0.0/8) for the group address, but avoid 239.0.0.x or 239.128.0.x as these overlap with the link local MAC addresses & flood out all switch ports. This group address cannot be used for any application in your network. If you have multiple controllers, configure different group address for different controllers. https://mrncciew.com/2012/11/17/configuring-multicast-on-wlc/

   Source: Adapted from community discussion — cskshiet

   References

   • Cisco documentation

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7. Question 217 · 294 in bank

   Select 2

   A wireless network has been implemented to enable multicast video to be streamed reliably over the wireless link to the wireless users. After a client reports that the video is unable to stream, the administrator determines that the client is connecting at a data rate of 12 Mbps and is trying to stream to a valid multicast address on the network. Which two actions must be applied? (Choose two.)

   • ATurn off IGMP snooping for all the configured WLANs on the controller.
   • BImplement video-stream for the multicast video on the controller.
   • CAllow multicast-direct to work correctly and multicast-direct to be enabled globally.
   • DChange the WLAN QoS value to Bronze for the WLAN that multicast will be enabled.
   • EAllow RTSP to stream the video due to wireless multicast not using acknowledgements.

   Show answer

   Answer: BC

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8. Question 218 · 294 in bank

   Select 2

   Which two restrictions are in place with regards to configuring mDNS? (Choose two.)

   • AmDNS uses only UDP port 5436 as a destination port.
   • BmDNS cannot use UDP port 5353 as the destination port.
   • CmDNS is not supported on FlexConnect APs with a locally switched WLAN.
   • DController software must be newer than 7.0.6+.
   • EmDNS is not supported over IPv6.

   Show answer

   Answer: CE

   Explanation

   C E ARE CORRECT https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/multicast_broadcast_setup.html Restrictions for Configuring Multicast DNS mDNS over IPv6 is not supported. mDNS snooping is not supported on access points in FlexConnect mode in a locally switched WLAN and mesh access points. For locally switched WLANs, all multicast traffic including mDNS is simply bridged between the local VLAN and the SSID.

   Source: Adapted from community discussion — shasxz

   References

   • Cisco documentation
   • Cisco documentation
   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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9. Question 219 · 294 in bank

   A network engineer needs to configure multicast in the network. The implementation will use multiple multicast groups and PIM routers. Which address provides automatic discovery of the best RP for each multicast group?

   • A224.0.0.13
   • B224.0.0.14
   • C224.0.1.39
   • D224.0.1.40

   Show answer

   Answer: D

   References

   • Cisco documentation
   • Cisco documentation

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10. Question 220 · 294 in bank

    A shopping center uses AireOS controllers with Cisco Wave 2 APs. A separate WLAN named Guest-012345678-WLAN is used for guest wireless clients. Management needs location analytics to determine popular areas. CMX must track only associated clients. What must be selected on the CMX server settings?

    • AExclude probing clients
    • BDuty Cycle Cutoff
    • CEnable Locally Administered MAC Filtering
    • DEnable Location MAC Filtering

    Show answer

    Answer: A

    Explanation

    Reference: https://www.cisco.com/c/en/us/td/docs/wireless/mse/10-6/cmx_config/b_cg_cmx106/the_cisco_cmx_detect_and_locate_service.html#id_123333

    References

    • Cisco documentation

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300-430 practice, question 211. 294 questions available.