350-801 practice questions 121–130

1. Question 121 · 450 in bank

   Which configuration tells a switch port to send Cisco Discovery Protocol packets that configure an attached Cisco IP phone to trust tagged traffic that is received from a device that is connected to the access port on the Cisco IP phone?

   • ARouter# configure terminal Router(config)# interface gigabitethernet 5/1 Router(config-if)# platform qos trust extend
   • BRouter# configure terminal Router(config)# interface gigabitethernet 5/1 Router(config-if)# platform qos trust extend cos 3
   • CRouter# configure terminal Router(config)# interface gigabitethernet 5/1 Router(config-if)# platform qos trust extend cos 5
   • DRouter# configure terminal Router(config)# interface gigabitethernet 5/1 Router(config-if)# platform qos extend trust

   Show answer

   Answer: A

   Explanation

   I hate questions like this one. A good engineer doesn’t need to know the exact command. Whether it is platform qos trust extend or platform qos extend trust. Some people get words and letters mixed up in their head. But they’ll have no issues in front of the CLI for something like this…

   Source: Adapted from community discussion — Omitted

   References

   • Cisco documentation

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2. Question 122 · 450 in bank

   Which recommendation is the best practice for marking video and voice media in a Cisco Unified Communications network?

   • AVoice Cos 5 (IP Precedence 6, PHB AF41, or DSCP 16) Video Cos 4 (IP Precedence 5, PHB EF, or DSCP 32)
   • BVoice Cos 6 (IP Precedence 4, PHB AF41, or DSCP 24) Video Cos 5 (IP Precedence 4, PHB EF, or DSCP 34)
   • CVoice Cos 5 (IP Precedence 2, PHB EF, or DSCP 48) Video Cos 4 (IP Precedence 4, PHB AF41, or DSCP 46)
   • DVoice Cos 5 (IP Precedence 5, PHB EF, or DSCP 46) Video Cos 4 (IP Precedence 4, PHB AF41, or DSCP 34)

   Show answer

   Answer: D

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/netstruc.html

   Source: Adapted from community discussion — msully

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3. Question 123 · 450 in bank

   How can an engineer determine location-based CAC bandwidth requirements for Cisco Unified Communications Manager?

   • ASet the requirements in the service parameters.
   • BAdd the requirements for each audio and video codec and multiply how many calls must be supported.
   • CExecute the Resource Reservation Protocol to return location-based requirements.
   • DCalculate the number of calls against the license for Cisco Unified Border Element to determine calls per location.

   Show answer

   Answer: B

   References

   • Cisco documentation

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4. Question 124 · 450 in bank

   There is a saturated link that has traffic shaping configured. How is incoming traffic processed?

   • ATraffic is compressed so that the traffic fits within the bandwidth of the link.
   • BExcess traffic is queued, and then dropped after the timer expires.
   • CExcess traffic is queued for later transmission.
   • DExcess traffic is dropped.

   Show answer

   Answer: C

   Explanation

   It's C, will queue packets for retransmission before it drops them. But based on this "How is incoming traffic processed?" I would say shaping is applied to the egress so this question doesn't make sense.

   Source: Adapted from community discussion — iamnoone

   References

   • Cisco documentation

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5. Question 125 · 450 in bank

   Which field of a Real-Time Transport Protocol packet allows receiving devices to detect lost packets?

   • Atimestamp
   • BCSRC (Contributing source ID)
   • Csequence number
   • DSSRC (Synchronization source identifier)

   Show answer

   Answer: C

   Explanation

   Reference: https://www.oreilly.com/library/view/packet-guide-to/9781449339661/ch04.html

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6. Question 126 · 450 in bank

   Which DiffServ marking is the most likely to drop packets?

   • AAF13
   • BAF12
   • CAF11
   • DAF32

   Show answer

   Answer: A

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_dfsrv/configuration/15-mt/qos-dfsrv-15-mt-book/qos-dfsrv.html

   Source: Adapted from community discussion — ciscogeek

   References

   • Cisco documentation

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7. Question 127 · 450 in bank

   What is a QoS requirement for VoIP calls?

   • Aג‰₪ 15% packet loss
   • Bג‰₪ 150 bps per phone of guaranteed bandwidth
   • Cג‰₪ 150 ms of jitter
   • Dג‰₪ 150 ms of one-way latency from mouth to ear

   Show answer

   Answer: D

   Explanation

   The answer is D. I think what's throwing most of us off is the wording "Mouth to ear". In the current SRND, it explains this clearly - https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12/netstruc.html#20861

   Source: Adapted from community discussion — Mert_kerna

   References

   • Cisco documentation

   Next question

8. Question 128 · 450 in bank

   End users report bad video quality and voice choppiness on Cisco Collaboration endpoints. The engineer changed the device pool the users were in but did not correct the problem. Which action should be taken to troubleshoot this issue?

   • ARestart the Cisco Location Bandwidth Manager service on the Cisco UCM publisher
   • BCheck for duplex/speed mismatches between the network port settings of the system and network switch
   • CUse direct IP address calls between two endpoints to troubleshoot call quality issues
   • DSet the service parameter Use Video Bandwidth Pool for Immersive Video Calls to ג€falseג€

   Show answer

   Answer: B

   Explanation

   This looks like a B to me. They mention that the audio is choppy as well, I dont think this parameter affects audio. Only video.

   Source: Adapted from community discussion — Pashat

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9. Question 129 · 450 in bank

   Select 2

   Which two approaches are taken to implement CAC within Cisco UCM in full-mesh topology? (Choose two.)

   • Aphysical location
   • BAudio Codec Preference List
   • Clocation-based CAC
   • DRSVP-enabled locations
   • Edevice pool

   Show answer

   Answer: CD

   Explanation

   I think it should be C and D. (device pool) is not an "approach". Also, within the SRND, you can see these statements: 1)"For non-centralized systems, Cisco Unified Communications Manager offers an alternative CAC method, Resource Reservation Protocol (RSVP)." 2)"Cisco Unified Communications Manager also supports Resource Reservation Protocol (RSVP), an additional CAC mechanism that offers additional capabilities for full-mesh network topologies. Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_0_1/ccmsys/CUCM_BK_SE5FCFB6_00_cucm-system-guide-100/CUCM_BK_SE5FCFB6_00_cucm-system-guide-100_chapter_01000.html

   Source: Adapted from community discussion — Komy

   References

   • Cisco documentation

   Next question

10. Question 130 · 450 in bank

    An administrator is troubleshooting an issue where an 8845 is not joining the correct voice VLAN configuration from a switch and they believe that LLDP is the issue. Which command allows the administrator to see the packets sent from the phone to the switch?

    • Ashow lldp status <interface>
    • Bshow lldp traffic
    • Cshow lldp
    • Dshow lldp run

    Show answer

    Answer: B

    Explanation

    Ansver is B: Display LLDP counters, including the number of packets sent and received, number of packets discarded, and number of unrecognized TLVs Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_37_ey/configuration/guide/scg/swlldp.pdf

    Source: Adapted from community discussion — wwisp3422112

    References

    • Cisco documentation

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350-801 practice, question 121. 450 questions available.