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Take Assessment - Module 7 Exam - CCNP: Building Multilayer Switched Networks (Version 5.0)

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1 Which three statements about voice traffic are true? (Choose three.)

TCP ensures the quality of voice traffic.

The one-way delay should be no more than 150 ms.

Voice packets typically vary between 20 and 60 bytes.

A typical voice call requires between 17 kbps and 106 kbps.

A typical voice call requires approximately 150 bps for voice-control traffic.

Voice traffic has relatively weak QoS requirements.

2 What are three characteristics of voice traffic? (Choose three.)

For reasonable voice quality, there cannot be any packet loss.

For voice quality, delay should be no more than 45 ms round trip.

For voice quality, delay should be no more than 150 ms one way.

TCP is used to package voice packets.

UDP is used to package voice packets.

Voice packets are typically small - usually 60 to 120 bytes.

3

Refer to the exhibit. Which switch interface configuration command would automatically configure quality of service (QoS) for voice over 

IP (VoIP) within a QoS domain?

mls qos trust

switchport priority extend cos 7

switchport priority extend trust

auto qos voip cisco-phone

4

Refer to the exhibit. PC data traffic and IP phone packet data share the same physical link to the switch and the same switch port. What

should be done to prevent the sound quality of the voice traffic from deterioration when data is sent on the same link?

Configure the trust boundaries of the network at the switch access port.

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Configure the trust boundary of the network on the IP phone.

Enable the voice VLAN feature on the switch access ports to carry IP voice traffic from the IP phone.

Enable QoS on the switch by entering the mls qos global configuration command.

Configure the MAC address of the IP phone as a static secure or sticky secure MAC addresses on the switch access port.

5 Which two statements are true about voice traffic in a converged network? (Choose two.)

Voice traffic is the only traffic type that requires QoS functionality.

Because of the available bandwidth, separating voice traffic from data traffic on the same VLAN (subnet) is not required.

Voice traffic tends to require a more consistent amount of bandwidth per conversation than does data traffic.

Transaction based traffic tends to have higher QoS requirements than does voice traffic.

Voice traffic utilizes relatively small packet sizes.

To reduce processing latency, voice VLANs are implemented to allow voice traffic to be forwarded without VLAN tags.

6 What two traffic types must be included when calculating the bandwidth requirements to support a voice stream in an IP telephony

network? (Choose two.)

voice queues

voice carrier stream

voice management traffic

voice services traffic

call control signaling

routing updates

7

Refer to the exhibit. What is the effect when the switchport priority extend cos 3 command is configured on the switch port interface

connected to the IP phone?

Effectively, the trust boundary has been moved to the PC attached to the IP phone.

The IP phone is enabled to override with a CoS value of 3 the existing CoS marking of the PC attached to the IP phone.

The computer is now establishing the CoS value and has effectively become the trust boundary.

The switch will no longer tag incoming voice packets and will extend the trust boundary to the distribution layer switch.

8 Which statement describes the function of a trust boundary?

Trust boundaries are a point in the network where decisions about CoS markings on incoming packets are made.

Trust boundaries determine whether certain types of traffic can pass.

Trust boundaries are a point in the network where QoS functionality begins and ends.

Trust boundaries are points in the network where Layer 2 CoS markings are converted to Layer 3 DSCP or IP precedence

markings.

9 When Cisco IOS is being used in a switched environment, which two statements are true about configuring AutoQoS? (Choose two.)

Once AutoQoS is configured, manual adjustments to the QoS settings cannot be done unless AutoQoS is disabled with the no auto

qos command.

The command auto qos voip cisco-phone should be configured on switch ports connected to end-user devices.

The command auto qos voip cisco-phone should be configured on trunk links between switches.

The global configuration command auto qos voip trust must be configured before configuring interfaces with the auto qos voip

cisco-phone command.

The mls qos global configuration command must be configured before configuring interfaces with the auto qos voip cisco-phonecommand.

When configuring the auto qos voip cisco-phone command on interfaces, it is important that CDP be enabled.

10 Which three statements are true concerning basic Quality of Service (QoS) regarding the support of Cisco IP phones? (Choose three.)

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Critical traffic may take possession of a resource by dropping low-priority packets.

If network management indicates that specific traffic is experiencing latency, jitter, and packet loss, then QoS can be used to adjust

how that traffic is handled.

Priority access into the core layer is provided based on Layer 3 QoS tags.

Priority traffic marking occurs at the core layer using Layer 3 QoS tags.

Jitter is the amount of time that a packet resides in the output queue of an interface.

Best practices for QoS trust boundaries include marking traffic as far away from the traffic source as possible.

11 Which four devices must be included in power requirement calculations for UPS backup of a VoIP environment? (Choose four.)

switches forwarding VoIP traffic, but not providing power to IP phones

switches forwarding VoIP traffic and providing power to IP phones

Internet gateways

IP phones

CallManager servers

Internet firewalls

12 What happens when untrusted traffic enters a trust boundary device?

Traffic is sent unmarked.

Traffic is marked with the default QoS value.

Traffic is marked with the new QoS value appropriate for the policy in place.

Traffic is sent and the original QoS value is retained.

13

Refer to the exhibit. What is the effect on the trust boundary when configuring the command mls qos trust cos on the switch port that is

connected to the IP phone?

The host is now establishing the CoS value and has effectively become the trust boundary.

The switch is rewriting packets it receives from the IP phone and determining the CoS value.

Effectively the trust boundary has been moved to the IP phone.

The switch will no longer tag incoming voice packets and will trust the distribution layer switch to set the CoS.

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