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At which layers of the OSI model do WANs operate? (Choose two.)（）
A . application layer
B . session layer
C . transport layer
D . network layer
E . datalink layer
F . physical layer
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Which two models are the models of DiffServ-Award traffic Engineering？（）
A . Class-based Model
B . Maximum Allocation Model
C . Russian Doll Model
D . Global Tunnel Model
E . Policy-based Model
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At which layers of the OSI model do WANs operate (Choose two.)（）。
A . application layer
B . session layer
C . transport layer
D . network layer
E . datalink layer
F . physical layer
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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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Which two statements are true about RSVP and the InServ QoS model？（）
A . a drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol
B . RSVP uses DSCP to signal QoS requirements to routers
C . RSVP is a routing protocol
D . RSVP is an IP protocol that uses IP protocol ID 46， and TCP/UDP ports 3455
E . RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic
F . the flow-based approach of RSVP is ideal for large， scalable implementations such as the public internet
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Which two models are the models of DiffServ-Aware Traffic Engineering？ （）
A . Policy-based Model
B . Class based Model
C . Russian Doll Model
D . Global Tunnel Model
E . Maximum Allocation Model
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What are two characteristics of the DiffServ model？（）
A . service guarantee
B . traffic that is divided into classes
C . not scalable to large implementations
D . QoS mechanisms that are used without prior signaling
E . applications that signal their particular QoS and bandwidth requirement
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What are two components of the OoS Integrated Services （IntServ） model？ （）
A . link efficiency
B . admission control
C . classification and marking
D . shaping and policing
E . congestion avoidance using the RTP protocol
F . resource reservation using the RSVP protocol
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Which two statements about the DiffServ QoS model are true？（）
A . DiffServ requires RSVP to set up a path through the network to accommodate the requested QoS.
B . Network traffic is identified by class， and the level of service is chosen for each class.
C . The DiffServ model relies on a fairly simple mechanism to provide QoS over a wide range of equipment.
D . RSVP enables the DiffServ model to provide end-to-end QoS.
E . The DiffServ model is more scalable than the IntServ model.
F . The flow-based approach of the DiffServ model is ideal for large scalable implementations such as the public Internet.
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Which of the following are associated with the application layer of the OSI model？（two.）（）
A . ping
B . Telnet
C . FTP
D . TCP
E . IP
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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 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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XYZ LTD wants to connect Cisco IP Phones and Cisco Aironet Access Points to the network. The customer also wants to use the PoE features included in the Cisco Catalyst Express 500 Series Switches. Which two models can provide this features?（）
A . WS-CE500G-12TC
B . WS-CE500-24PC
C . WS-CE500-24TT
D . WS-CE500-24LC
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Which two statements about the diffserv model are true？（）
A . a class can be inentified as a single application .multiple applications with similar service nees.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 scalabilty.
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Why does the data communication industry use the layered OSI reference model (Choose two.)（）。
A . It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
B . It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
C . It supports theevolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers.
D . It encourages industry standardization by defining what functions occur at each layer of the model.
E . It provides a means by which changes in functionality in one layer require changes in other layers.
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What are two components of the QoS Integrated Services （IntServ） model？（）
A . link efficiency
B . admission control
C . classification and marking
D . shaping and policing
E . congestion avoidance using the RTP protocol
F . resource reservation using the RSVP protocol
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Which of the following are associated with the application layer of the OSI model (Choose two.)（）。
A . ping
B . Telnet
C . FTP
D . TCP
E . IP
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Which two statements about the best effort model for QoS are true？（）
A . delay sensitive packets are given preferential treatment
B . the default policy identifies a delay sensitive class and default class
C . the default policy identifies a delay sensitive class， best effort class， and default class
D . the model is highly scalable
E . the model is still predominant on the internet F the model provides guaranteed service
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The Nova computer has two models, the Basic and the Basic Plus.
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The principle of comparative advantage is derived from a highly complicated two good/two country model.
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For the left hand of the two hand model, which lifestyle factor is NOT in the model?
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Listen to the recording and fill in the blanks.（所有字母均小写） When people meet for the 1 , the usually 2 . In business, people also 3 . In formal situations, people 4 exchange business cards. when you give a business card, give it with two hands. This is 5 .
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What is the primary difference between the two business models Joost is ignoring？
A．The number of firms adopting each business model.
B．Which is the more respectable method to advertising.
C．Whether to make users pay for what they download.
D．whether to allow users to keep what they download.
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听力原文：The merger of these two companies is not a conglomeration of the weaker into the stronger, but a willing marriage of the two giants in the IT industry and fine model of pursuing a win-win strategy.
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The underlined part in the sentence “Poverty...and old age go hand in hand.” can be p
是
否
