FTP 是基于_(1)_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(hù)和服務(wù)器之間建立的連 接是_(2)_，用于傳輸文件的是_(3)_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_(4)_，當(dāng)傳輸?shù)奈募�長(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)_(5)_。

(1)

A.IP

B.TCP

C.UDP

D.ICMP

(2)

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

(3)

A.數(shù)據(jù)

B.指令

C.控制

D.UDP

(4)

A.384

B.512

C.1024

D.1500

(5)

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

答案：BCABD

Flow control is a function that prevents network congestion by ensuring that _(1)_ do not overwhelm_(2)_ with data. There are three commonly used methods for handling network congestion . _(3)_is used by network devices to temporarily store bursts of excess data in memory until they can be processed. _(4)_ are used by receiving devices to help prevent their buffers from overflowing . _(5)_ 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.

(1)(2)

A.transmitting devices

B.transmitted devices

C.receiving devices

D.received devices

(3)(4)(5)

A.Buffer

B.Source-quench messages

C.window

D.Windowing

E.Buffering

答案：ACEBD

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