A．先来先服务B．最短时间优先C．响应比高者优先D．优先级若操作系统中有n个作业Ji(i=1，2，…，n)，分……

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

单项选择题When the system upon which a transport entity is running fails and subsequently restarts, the （） information of all active connections is lost.

A．data
B．state
C．signal
D．control