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试卷名称 2009年下半年网络规划设计师考试上午真题试题(综合知识)
考试中心《2009年下半年网络规划设计师考试上午真题试题(综合知识)》在线考试
试卷年份2009年下半年
试题题型【单选题】
试题内容

The network layer provides services to the transport layer. It can be based on either   (1)  . In both cases,its main job is   (2)   packets from the source to the destination.
In network layer,subnets can easily become congested,increasing the delay and   (3)   for packets. Network designers attempt to avoid congestion by proper design. Techniques include   (4)   policy,caching,flow control,and more.
The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client,traffic shaping,resource   (5)  ,and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiated services, and MPLS.

(1)A.virtual circuits or datagrams
B.TCP or UDP
C.TCP or IP
D.IP or ARP
(2)A.dealing with
B.routing
C.sending
D.receiving
(3)A.lowering the throughput
B.lowering the correctness
C.lowering the effectiveness
D.lowering the preciseness
(4)A.abandonment
B.retransmission
C.checksum
D.synchronism
(5)A.distribution
B.guarantee
C.scheme
D.reservation


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