在一台按字节编址的8位计算机系统中，采用虚拟页式存储管理方案，页面的大小为1KB，且系统中没有使用快表（或联想存储器）。
下图所示的是划分成6个页面的用户程序。 

图中swapA，B是16位的指令，A和B表示该指令的两个16位操作数。swap指令存放在内存的1023单元中，操作数A存放在内存的3071单元中，操作数B存放在内存的5119单元中。执行swap指令需要访问（）次内存，将产生（）次缺页中断。

执行swap指令需要访问（）次内存。

单项选择题若操作系统中有n个作业Ji(i=1，2，…，n)，分别需要Ti(i=1，2，…，n)的运行时间，采用（）的作业调度算法可以使平均周转时间最短。

A．先来先服务
B．最短时间优先
C．响应比高者优先
D．优先级

单项选择题Migration of these （） network elements to IP-based DCNs is a logical strategy.

A．traditional
B．dominancy
C．redundancy
D．legacy

单项选择题Additional maintenance procedures must be maintained and administrative records are （）.

A．declined
B．proliferated
C．destroyed
D．produced

单项选择题The duplication of transport facilities to carry （） network traffic is an inefficient use of resources.

A．overlook
B．overlie
C．overlay
D．overleap

单项选择题Sometimes requiring parallel groups specializing in each （）hence.

A．line
B．platform
C．server
D．switch

单项选择题Astute service providers realize that the continued support of legacy X.25 and asynchronous network elements using separate operations networks is cost （）.

A．prohibitive
B．feasible
C．connective
D．special

单项选择题When the RST i reaches the other side, it must be checked for validity based on the （） number i, as the RST could be in response to an old segment.

A．sequence
B．acknowledgment
C．connection
D．message

单项选择题When the timer （）, the transport entity assumes that either the other transport entity or the intervening network has failed. As a result, the timer closes the connection, and signals an abnormal close to the TS user.

A．stops
B．restarts
C．expires
D．abandons

单项选择题This timer measures the time the transport machine will continue to await an （） of a transmitted segment after the segment has been retransmitted the maximum number of times.

A．reset
B．acknowledgment
C．sequence
D．synchronizer

单项选择题The still active side of a half-open connection can close the connection using a （） timer.

A．give-up
B．abandon
C．quit
D．connection