默认题库 - CCNP(642-845)

多选题

Which two statements are true about the protocols that are used for transmitting voice traffic？（）

A. RTP multiplexing is used to keep multiple phone conversations separate
B. RTP provides end-to-end delivery services for voice traffic.
C. UDP is used to ensure a reliable transmission from sender to receiver.
D. RTP is used to provide resource reservation for the voice stream.
E. UDP provides multiplexing of multiple phone conversations.

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单选题

End-to-end QoS is maintained in the Cisco WLAN deployment model by utilizing what parameter in lieu of 802.1p？（）

A. IP precedence
B. type of service （ToS）
C. class of service （CoS）
D. differentiated services code point （DSCP）

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多选题

Which two QoS classification and marking statements are true？（）

A. In a Frame Relay network， delay sensitive traffic is tagged with the discard eligible （DE） bit.
B. In an MPLS network， the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field.
C. In an MPLS network， the MPLS EXP bits are used to identify up to 16 CoS values.
D. The differentiated services code point （DSCP） field consists of the first three bits of the IP precedence field in the header of an IP packet.
E. The 802.1Q standard uses a three bit field referred to as the user priority bits （PRI） to mark packets as belonging to a specific Co

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多选题

What are three Cisco Unified CallManager features？（）

A. programming interface to external applications
B. FXS and FXO port negotiation
C. AutoQos VoIP trust boundaries
D. signaling and device control
E. LLQ for voice and video traffic
F. directory and XML service

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多选题

Which two statements about the DiffServ model are true？（）

A class can be identified as a single application， multiple applications with similar service needs， or be based on the source or destination IP addresses.
B. A drawback of the DiffServ model is that it does not provide backward compatibility with devices that can only use the ToS field.
C. DiffServ uses the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）.
D. The DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field.
E. The first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value.
F. The primary goal of DiffServ is scalability.

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多选题

Which two statements about the DiffServ model are true？（）

A. a class can be identified as a single application， multiple applications with similar service needs，or be based on the source or destination IP address
B. a drawback of the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）
C. DiffServ uses the DiffServ field in the MAC header to mark frames into behavior
D. the DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field
E. the first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value
F. the primary goal of DiffServ is scalability

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多选题

Which three statements are true about the application of QoS models？（）

A. The DiffServ model requires applications to signal the network with QoS requirements.
B. The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses.
C. The DiffServ model requires RSV
D. The best effort model is suitable for applications such as file transfer and e-mail
E. The IntServ model requires applications to signal the network with QoS requirements.
F. The IntServ model attempts to deliver a level of service based on the QoS specified by each packet

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多选题

AutoQoS Discovery has run on the Acme Entertainment Company’s network for several days and has produced the suggested policy shown in the exhibit. Acme wishes to 1） allow more bandwidth for browser-type traffic because it is the job of many of their employees to be browsing the web as a part of their job， and 2） to allow greater bandwidth for file transfers because they expect an upcoming surge in movie uploads and downloads. Which two statements would you replace to best accomplish those goals without sacrificing voice quality？（）

A. in class class-default, replace fair-queue with bandwidth remaining percent 50
B. in class autoqos-transactional-Fa0/1, replace bandwidth remaining percent 40 with bandwidth remaining percent 20
C. in class autoqos-transactional-Fa0/1, replace bandwidth remaining percent 40 with bandwidth remaining percent 30
D. in class autoqos-Bulkl-Fa0/1, replace bandwidth remaining percent 19 with bandwidth remaining percent 25
E. in class autoqos-Scavenger-Fa0/1, replace bandwidth remaining percent 1 with bandwidth remaining percent 10
F. in class autoqos-Signaling-Fa0/1, replace bandwidth remaining percent 4 with bandwidth remaining percent 1&e

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单选题

白血病的主要临床特点不包括：（）

A. 肝脏、脾脏肿大
B. 出血
C. 感染
D. 贫血
E. 夜尿增多

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多选题

Which two statements about queuing mechanisms are true？（）

A. FIFO queuing is only appropriate for slower serial interfaces
B. weighted fair queuing is the default queuing mechanism used for all but slower than E1 rate interfaces
C. only one queuing mechanism type can be applied to an interface
D. weighted fair queuing does not require the configuration of access lists to classify traffic
E. flow-based weighted fair queuing provides for queues to be serviced in a round-robin fashio

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