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  3. The network layer provides services to t

The network layer provides services to t

免费题库2022-08-02  64
问题 The network layer provides services to the transport layer.It can be based on either（   ）.  In both cases,  its main job is （　　）packets from the source to the destination.In network layer, subnets can easily become congested, increasing the delay and （　　）for packets.Network designers attempt to avoid congestion by proper design.Techniques include （　　） policy, caching, flow control, and more.The next step beyond just dealing with congestion is to actually try to achieve a promisedquality of service.The methods that can be used for this include buffering at the client, trafficshaping, resource （　　）, and admission control.Approaches that have been designed forgood quality of service include integrated services （including RSVP）, differentiated services, and MPLS.问题1选项 A.virtual circuits or datagrams B.TCP or UDP C.TCP or IP D.IP or ARP问题2选项 A.dealing with B.routing C.sending D.receiving问题3选项 A.lowering the throughput B.lowering the correctness C.lowering the effectiveness D.lowering the preciseness问题4选项 A.abandonment B.retransmission C.checksum D.synchronism问题5选项 A.distribution B.guarantee C.scheme D.reservation
选项
答案
解析 答案： A、B、A、B、D。
网络层为传输层提供服务，它基于虚电路或数据报方式，其主要工作是对源节点的包进行路由选择，转发到目的节点。
在网络层，通信子网很容易出现拥塞，导致包的延迟增加、吞吐率降低。网络设计者试图通过良好的设计避免拥塞，所使用的技术包括重传策略、缓冲策略和流控制等。
仅仅处理拥塞是不够的，下一步的目标是试图达到设定的服务质量。可以使用的方法有客户端缓存、通信量整形、资源预留和接纳控制等。已提出的、较好的服务质量控制方法有集成服务（包括RSVP）、区分服务和MPLS。
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高级网络规划设计师

软件水平考试初中高级

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