【单选题】【消耗次数：1】
有关停止等待协议，说法错误的是（ ）。
①
协议简单但信道的利用率低
②
协议是发送完一个分组就停止，等待确认后再发送
③
使用流水停止等待协议可以提高利用率
④
报文传输效率高。
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相关题目
【多选题】
关于利用率，说法正确的是（ ）
①
分为网络利用率和信道利用率
②
信道利用率越大，时延也就越大
③
信道利用率不可能接近100%
④
信道利用率达到50%时，时延就是空闲时时延的2倍
【单选题】
以太网线路利用率，说法错误的是（）
①
要提高以太网的信道利用率，就必须减小?与T0之比
②
以太网的帧长不能太短，否则利用率会太低。
③
当以太网的利用率达到30%时就已经处于重载的情况。
④
只有当参数a远大于1才能得到尽可能高的极限信道利用率。
随机题目
【单选题】
—She may not be free today.—________, well have to put the meeting off.
①
If may
②
If not
③
If she may not
④
If she may not be free today
【单选题】
—Doyouthinkitsgoingtorainovertheweekend?—_______.
①
I dont believe
②
I dont believe it
③
I believe not so
④
I believe not
【单选题】
—Is your mother going to the supermarket?—No, _______.
①
she doesnt
②
shes cooking
③
she gets by bus
④
to a tailors shop
【单选题】
The position of a grandparent is easier than ______ of a parent.
①
ones
②
this
③
that
④
it
【单选题】
Itsnouse_______menottoworry.
①
you tell
②
your telling
③
for you to have told
④
having told
【单选题】
Ifyouwant______youhavetogetthefundsomewhere.
①
that the job is done
②
the job done
③
to have done the job
④
the job that is done
【单选题】
While _______ the sun, the satellite has sent more than four billion bits of information back to earth.
①
having orbited
②
being orbited
③
having been orbited
④
orbiting
【单选题】
Theyareconsidering______beforethepricesgoup.
①
of buying the house
②
with buying the house
③
buying the house
④
to buy the house
【单选题】
Having no money but _______ to know, he simply said he would go without dinner.
①
not to want anyone
②
not wanting anyone
③
wanted no one
④
to want no one