FTP 是基于_(11)_實(shí)現(xiàn)的文件傳輸協(xié)議,使用此協(xié)議進(jìn)行文件傳輸時(shí),F(xiàn)TP 客戶和服務(wù)器之間建立的連 接是_(12)_,用于傳輸文件的是_(13)_連接。TFTP 是基于 UDP 實(shí)現(xiàn)的簡(jiǎn)單文件傳輸協(xié)議,它共有五種協(xié)議數(shù) 據(jù)單元 PDU,其中數(shù)據(jù) PDU 一次可以攜帶的數(shù)據(jù)最多是_(14)_,當(dāng)傳輸?shù)奈募L(zhǎng)度恰好是其整數(shù)倍時(shí),則文 件傳輸完畢后,還必須在最后發(fā)送一個(gè)_(15)_。
(11)
A.IP
B.TCP
C.UDP
D.ICMP
(12)
A.數(shù)據(jù)連接
B.控制連接和指令連接
C.控制連接和數(shù)據(jù)連接
D.數(shù)據(jù)連接和指令連接
(13)
A.數(shù)據(jù)
B.指令
C.控制
D.UDP
(14)
A.384
B.512
C.1024
D.1500
(15)
A.確認(rèn) PDU
B.應(yīng)答 PDU
C.請(qǐng)求 PDU
D.無(wú)數(shù)據(jù)的數(shù)據(jù) PDU
Flow control is a function that prevents network congestion by ensuring that _(16)_ do not overwhelm_(17)_ with data. There are three commonly used methods for handling network congestion . _(18)_is used by network devices to temporarily store bursts of excess data in memory until they can be processed. _(19)_ are used by receiving devices to help prevent their buffers from overflowing . _(20)_ is a flow-control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.
(16)(17)
A.transmitting devices
B.transmitted devices
C.receiving devices
D.received devices
(18)(19)(20)
A.Buffer
B.Source-quench messages
C.window
D.Windowing
E.Buffering
答案:11-15 BCABD 16-20 ACEBD
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