The source device will only retransmit lost packets on the request of the destination device.
The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.
The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.
The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.
If the destination device does not receive a segment, all segments are retransmitted.
The source device keeps a record of all segments sent and expects and acknowledgment of each.
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
第2题:
A、RR和AR
B、RR和PAR
C、RR和AR%
D、PAR和PAR%
E、AR和AR%
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
第4题:
人群归因危险度百分比(PAR%)
第5题:
人群归因危险度(PAR)
第6题:
光合有效辐射PAR辐射
第7题:
Gram positive bacteria
第8题:
PAR—Q问卷及目的是什么?
第9题:
a positive righting moment
an increase in KM
a negative restoring force
a positive restoring force
第10题:
préparé
préparée
préparés
préparées
第11题:
partagées entre l’homme et la femme
faites par l’homme
faites par la femme
faites par quelqu’un d’autre
第12题:
第13题:
73( )
A. application
B. connection
C. stream
D. acknowledgement
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
第15题:
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()。
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?
第18题:
Which fields are included in the TCP header?()
第19题:
Regarding PAR (Positive Acknowledgement and Re-transmission), which of the answer choices below are correct?()
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。
第21题:
第22题:
be positive
be positive and made in ample time
be positive,made in ample time and with due regard to the observance of good seamanship
be positive,made in ample time,with due regard to the observance of good seamanship and avoiding complying with local regulations
第23题:
ses proportions, et surtout par l’exceptionnelle unité de l’architecture et du décor
ses escaliers
ses colonnes
ses cristaux
第24题:
Les patients dormant cinq heures par nuit peuvent perdre en moyenne 55 % de masse grasse, ce qui est le plus idéal.
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.
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 %.
Les patients dormant cinq heures par nuit perdent moins de masse grasse que les participants dormant une nuit complète.