多选题Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?()AThe source device will only retransmit lost packets on the request of the destination device.BThe source device starts a timer when it sends

题目
多选题
Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?()
A

The source device will only retransmit lost packets on the request of the destination device.

B

The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.

C

The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.

D

The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.

E

If the destination device does not receive a segment, all segments are retransmitted.

F

The source device keeps a record of all segments sent and expects and acknowledgment of each.


相似考题
更多“Regarding PAR (Positive Acknowledgement and Re-transmission)”相关问题
  • 第1题:

    若有函数func(par1,par2+par3,(par4,par5)):在调用该函数时,实参的个数是 ______。

    A.3

    B.4

    C.5

    D.有语法错误


    正确答案:A

  • 第2题:

    在队列研究中,反映与非暴露相比暴露生物学效应(致病作用)的指标是

    A、RR和AR

    B、RR和PAR

    C、RR和AR%

    D、PAR和PAR%

    E、AR和AR%


    参考答案:ACE

  • 第3题:

    The usual way to ensure reliable delivery is to provide the (71) with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special (72) flame bearing positive or negative (73) about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the frame. has arrived safely. On the other hand, a negative acknowledgement means that' something has gone wrong, and the frame. must be transmitted again.

    An additional complication comes from the possibility that hardware troubles may cause a flame to (74) completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame. and then waits for an acknowledgement, positive or negative, will hang forever if a frame. is ever lost due to, for example, (75) hardware.

    A.receiver

    B.controller

    C.sender

    D.customer


    正确答案:C

  • 第4题:

    人群归因危险度百分比(PAR%)


    正确答案: 表示人群中由于暴露于某因素所致的发病率或死亡率占人群发病率或死亡率的百分比。它提示在完全控制暴露因素后,人群中某病发病(或死亡)率可能下降的程度。

  • 第5题:

    人群归因危险度(PAR)


    正确答案:指总人群发病率中归因于暴露的部分。

  • 第6题:

    光合有效辐射PAR辐射


    正确答案: 能够被绿色植物吸收,并用于光合作用形成有机化合物的辐射能。

  • 第7题:

    Gram positive bacteria


    正确答案: 革兰氏阳性菌:细菌经革兰氏染色染色后最终染成紫色的菌

  • 第8题:

    PAR—Q问卷及目的是什么?


    正确答案: 指教练询问会员相关健身及健康情况问卷。
    目的:使教练更快了解会员的基本信息。

  • 第9题:

    单选题
    In a storm,the windward lines of a ship’s mooring system provide().
    A

    a positive righting moment

    B

    an increase in KM

    C

    a negative restoring force

    D

    a positive restoring force


    正确答案: A
    解析: 暂无解析

  • 第10题:

    单选题
    Si tu vois les plats qu’elle a _____, tu n’hésiterais pas à venir.
    A

    préparé

    B

    préparée

    C

    préparés

    D

    préparées


    正确答案: A
    解析:
    句意:如果你看到她准备的菜,你就会毫不犹豫地来。此处为复合过去时,直接宾语提前,过去分词préparé需要与les plats(阳性复数)进行配合。故选C。

  • 第11题:

    单选题
    Dans une famille française, les tâches ménagères sont au début .
    A

    partagées entre l’homme et la femme

    B

    faites par l’homme

    C

    faites par la femme

    D

    faites par quelqu’un d’autre


    正确答案: B
    解析:
    从文章第二段Chez les jeunes couples, au début, tout se passe bien.可知,开始家庭生活很和谐,但是后来,男人不愿做家务,第二段中pousse les femmes à reprendre en main ce que les hommes font toujours trop mal, trop tard, pas sérieusement.促使女人又重新操持家务。

  • 第12题:

    问答题
    Practice 3  Equity securities are known as shares (or stock) in a corporation. Stockholders are considered owners of the corporation. The Articles of Incorporation must state the number of shares and the characteristics of the stock. To issue stock is actually to offer shares of stock for sale. The corporation’s Board of Directors controls when and to whom the corporation’s shares are offered and sold.  Outstanding shares—Outstanding shares are shares already issued and purchased by the shareholder or stockholder.  Par value—Par value is an arbitrary value assigned to each share in the Articles of Incorporation but does not necessarily reflect the true market value of the stock. Shares may not be issued and sold by the corporation for less than their par value therefore it is sometimes advisable not to state any par value at all or state a par value lower than the estimated market price. No par value allows the Board of Directors to decide each time shares are issued what the price per share will be. In a very large corporation where the stock is publicly traded at a public exchange, such as the New York Stock Exchange, the public demand for the stock of the corporation rather than the Board of Directors determines the selling price of the stock.  Capital account—The capital account of a corporation is an entry in the books of the corporation and is determined by multiplying the par or stated value of the corporation’s stock by the number of shares outstanding. For example, if the corporation had sold 1,000 shares of stock which had $10 par value, the capital account would be $10,000.

    正确答案:
    【参考译文】
    股票是指公司发行的股份。股东是公司的所有者。公司条例必须说明公司股份的数量及其特征。发行股票实际上是出售公司的股份。公司董事会决定何时以及向何种人发售股票。
    流动股——指已发行的,股东已购买的股票。
    票面价值——指根据公司条例而赋予每股股票的价值。但它并不一定反映股票真正的市场价值。股票不能以低于票面价值发行和出售,因此有时不规定票面价值或所规定的票面价值低于估计的市场价值是非常明智的。在没有规定票面价值时,公司董事会得以在每次发行股票时决定每股的价格。某大公司的股票在大型公共交易所(如纽约证券交易所)进行公开交易时,公众对公司股票的需求而不是公司董事会决定该公司股票的交易价格。
    资本性账户——指公司登记在册的资本,它等于流动股的数量与票面价值或是规定价值的乘积。比如说,某公司发行了1000股,每股票面价值为10美元,它的资本账户则是1万美元。
    解析: 暂无解析

  • 第13题:

    73( )

    A. application

    B. connection

    C. stream

    D. acknowledgement


    正确答案:D
    同71题解析

  • 第14题:

    ● The usual way to ensure reliable delivery is to provide the (71) with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special (72) frame. bearing positive or negative (73) about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the frame. has arrived safely. On the other hand, a negative acknowledgement means that something has gone wrong, and the frame. must be transmitted again. An additional complication comes from the possibility that hardware troubles may cause a

    frame. to (74) completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame. and then waits for an acknowledgement, positive or negative, will hang forever if a frame. is ever lost due to, for example, (75) hardware.

    (71)

    A. receiver

    B. controller

    C. sender

    D. customer

    (72)

    A. data

    B. control

    C. request

    D. session

    (73)

    A. application

    B. connection

    C. stream

    D. acknowledgement

    (74)

    A. vanish

    B. vary

    C. appear

    D. incline

    (75)

    A. acting

    B. working

    C. malfunctioning

    D. functioning


    正确答案:C,B,D,A,C

  • 第15题:

    Most economic data,____regarding hiring is positive.

    A.completely
    B.exclusively
    C.particularly
    D.specifically

    答案:D
    解析:
    本题考查词语辨析。题目意为:“大部分经济数据明确显示就业率正在趋好发展。” A项completely“完全地,彻底地”。B项 exclusively“唯一地,专有地,排外地”。C项particularly “特别地,独特地”。D项specifically“明确地,具体地”。
      

  • 第16题:

    在队列研究中,反映与非暴露相比暴露生物学效应(致病作用)的指标是()。

    • A、RR和AR
    • B、RR和PAR
    • C、RR和PAR%
    • D、PAR和PAR%
    • E、AR和PAR

    正确答案:A

  • 第17题:

    假设程序中的数据定义如下:  PAR DW ?  PNAME DB 16 DUP(?)  COUNT DD ?  PLENTH EQU $-PAR  求PLENTH的值为多少?表示什么意义?


    正确答案:PAR的偏移地址为0,PLENTH当前偏移地址$=2+16+4=22, $-PAR=22,故PLENTH的值为22。
    若在PLENTH所在行有变量定义,则$表示该变量的偏移地址,即$表示PLENTH所在行的当前偏移地址。故PLENTH表示从当前行到PAR之间定义的变量所占的字节个数。

  • 第18题:

    Which fields are included in the TCP header?()

    • A、Source Port
    • B、Acknowledgement Number
    • C、Request Number
    • D、Destination Address
    • E、Window
    • F、Data

    正确答案:A,B,E

  • 第19题:

    Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?()

    • A、The source device will only retransmit lost packets on the request of the destination device.
    • B、The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.
    • C、The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.
    • D、The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.
    • E、If the destination device does not receive a segment, all segments are retransmitted.
    • F、The source device keeps a record of all segments sent and expects and acknowledgment of each.

    正确答案:B,D,F

  • 第20题:

    已知PAR指示剂的H2In和HIn-形式显黄色,In2-形式及其金属离子络合物均为红色,PAR的pKa2=12.4。据此判断,PAR在pH<12时,呈现()颜色;变色点的pH();它在pH()范围,能用作金属指示剂。


    正确答案:黄色;12.4;<12

  • 第21题:

    名词解释题
    人群归因危险度(PAR)

    正确答案: 指总人群发病率中归因于暴露的部分。
    解析: 暂无解析

  • 第22题:

    单选题
    Any action taken to avoid collision shall,if the circumstances of the case admit,().
    A

    be positive

    B

    be positive and made in ample time

    C

    be positive,made in ample time and with due regard to the observance of good seamanship

    D

    be positive,made in ample time,with due regard to the observance of good seamanship and avoiding complying with local regulations


    正确答案: B
    解析: 暂无解析

  • 第23题:

    单选题
    L’Opéra de Paris demeure très impressionnant par _____.
    A

    ses proportions, et surtout par l’exceptionnelle unité de l’architecture et du décor

    B

    ses escaliers

    C

    ses colonnes

    D

    ses cristaux


    正确答案: C
    解析:
    从文章第二段最后一句l’opéra de paris est très impressionnant par ses proportions ,et surtout par l’exceptionnel unité de l’architecture et du décor可知,巴黎歌剧院是因为它的规模尤其是建筑和装饰绝无仅有的整体协调性而令人印象深刻的。故选A项。

  • 第24题:

    单选题
    Quelle est la conclusion de l’étude conduite sur une période de deux semaines?
    A

    Les patients dormant cinq heures par nuit peuvent perdre en moyenne 55 % de masse grasse, ce qui est le plus idéal.

    B

    Les patients dormant cinq heures par nuit peuvent perdre en moyenne 55 % de masse grasse, ce qui signifie que moins on dort, moins on prend du poids.

    C

    Si les patients dormant cinq heures par nuit peuvent perdre en moyenne 55 % de masse grasse, les patients dormant dix heures par nuit peuvent en perdre pros de 100 %.

    D

    Les patients dormant cinq heures par nuit perdent moins de masse grasse que les participants dormant une nuit complète.


    正确答案: B
    解析:
    根据文章最后一段中un patient dormant cinq heures par nuit perd en moyenne 55 % de masse grasse de moins qu’un participant dormant une nuit complète可知,睡10小时的人占100%,那么睡5小时的人占45%,排除A、B、C。