CCNA英语试题.doc

CCNA 英语题目
●以下不属于中间件技术的是(65) 。
(65) RMI Applet
● Networks can be interconnected by different the physical layer, networks can be connected by (66) or hubs, which just move the bits from work to an work. One layer up we find bridges and switches, which operate at data link layer. They can accept (67) , examine the MAC address, and forward the frames to a work while doing minor protocol translation in the process. In work layer, we have routers that can connect works, If works have (68) network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport , in the application layer, application gateways translate message (69) . As an example, gateways between e-mail and e-mail must (70) the e-mail message and change various header fields.
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● The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (71) of the technical requirements for the software the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into plete and detailed specification of each function that the software must perform and each (72) that it must starting point is usually a set of high-level requirements from the (73) that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines (74) showing how the system will be operated, publishes the system and operations concept document, and conducts a system concept review(SCR).Following the SCR, the team derives (75) requ