Why is QoS important in a converged network?（）A、Because data does not need to arrive intact, so data transfer rates can be variableB、Because lost voice-data packets must be retransmittedC、Because voice data packets should arrive quickly and sequentially,

第1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2题：

What ensures that voice packets are given priority throughout the network so that conversations arrive intact?（）

• A、Centrex
• B、Packet encryption
• C、Intelligent call routing
• D、QoS

第3题：

第4题：

VOIP has been implemented at the main office of the Company network. Which two statements  are true about voice packets in a LAN？（）

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

第5题：

VOIP is being implemented in the Company network and you need to assess the need for QoS.   Which of the following network problems would indicate a need to implement QoS features？（）

• A、Mis-routed packets  
• B、Excess jitter
• C、Delay of critical traffic
• D、Packet loss due to congestion
• E、Data link layer broadcast storms
• F、FTP connections unsuccessful

第6题：

Why is QoS important in a converged network?（）

• A、Because voice data packets must follow a single dedicated path through the network
• B、Because voice data packets should arrive quickly and sequentially, and with no lost data
• C、Because lost voice-data packets must be retransmitted
• D、Because data does not need to arrive intact, so data transfer rates can be variable

第7题：

Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）

• A、 Packets can arrive out of order.
• B、 Packets must take the same path to the destination.
• C、 Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.
• D、 Packets can experience varying delays across the network.
• E、 Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.

第8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9题：

A data file became corrupted in your database due to bad sectors on the disk. Because of corruption， you lost all the important tables in that data file. Which method would you use for recovery？（）

• A、flash back all the tables in the data file， one by one
• B、restore the data file to a new location and perform a media recovery
• C、flash back the database; there is no need to restore the data file
• D、restore the data file from the most recent backup and flash back the database

第10题：

When troubleshooting a network， the output of the command show interfaces indicates a large number of runts. What is a runt？（）

• A、the number of packets that are discarded because they exceed the maximum packet size of the medium
• B、errors created when the CRC generated by the originating LAN station or far-end device does not match the checksum calculated from the data received.
• C、the number of packets that are discarded because they are smaller than the minimum packet size of the medium
• D、the number of received packets that were ignored by the interface because the interface hardware ran low on internal buffers
• E、the number of times that the interface requested another interface within the router to slow down