If voice and d

第1题：

You have a good voice.（）

AThank you

BNot at all  

CJust so so

DMy voice isn't good

第2题：

Which two statements about voice VLANs are correct？（）

• A、Voice VLANs eliminate the need for QoS configuration
• B、Voice VLANs are used on trunk links to eliminate the need for QoS CoS markings
• C、Voice VLANs are mainly used to reduce the number of access switch ports that are used in the network
• D、Voice VLANs can be configured to forward existing CoS priorities or override them
• E、Voice VLANs are mainly used between access layer switches and distribution layer switches
• F、Voice VLANs can be configured on Layer 2 ports only

第3题：

第4题：

Which statement is true about the comparison of voice traffic with video traffic？（）

• A、 Video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
• B、 Latency requirements are less stringent for video traffic than for voice traffic.
• C、 Video traffic is less sensitive to dropped packets than for voice traffic.
• D、 Video traffic requires the retransmission capabilities of TCP whereas voice uses UDP.
• E、 Voice traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
• F、 Voice traffic requires the retransmission capabilities of TCP whereas video uses UDP.

第5题：

Which two statements are true about voice packets in a LAN？ （Choose two.）  （）

• A、 Voice traffic data flow involves large volumes of large packets.
• B、 Because a packet loss involves a small amount of data， voice traffic is less affected by packet losses than traditional data traffic is.
• C、 Voice carrier stream utilizes Real-Time Transport Protocol （RTP） to carry the audio/media portion of VoIP communication.
• D、 Voice packets are very sensitive to delay and jitter.
• E、 Voice packets are encapsulated in TCP segments to allow for proper sequencing during delivery.

第6题：

Which three statements are true about the data traffic characteristics of voice traffic？ （）

• A、latency must be kept below 150 ms
• B、latency is not a concern as long as jitter is kept below 30 ms
• C、voice packets do not require a specific type of queuing
• D、voice packets are rather small
• E、voice packets require TCP for rapid retransmission of dropped packets
• F、voice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload

第7题：

You have a good voice.（）

• A、Thank you
• B、Not at all  
• C、Just so so
• D、My voice isn't good

第8题：

第9题：

Which statement is true about the capabilities of a voice gateway router？（）

• A、voice gateways with analog interfaces need a gatekeeper to convert analog signals into digital format before voice is encapsulated into IP packets
• B、voice gateways need a gatekeeper to interconnect the VoIP networks the PSTN network
• C、voice gateways with Cisco Unified CallManager Express （CME） can permanently act as a call agent for IP phones
• D、voice gateways equipped with a DSP module can take the role of the call agent during WAN failure.

第10题：

What does the interface subcommand switchport voice vlan 222 indicate？（）

• A、The port is configured for both data and voice traffic.
• B、The port is fully dedicated to forwarding voice traffic.
• C、The port will operate as an FXS telephony port.
• D、Voice traffic will be redirected to VLAN 222.