在因特網(wǎng)的路由選擇協(xié)議中，屬于外部網(wǎng)絡(luò)協(xié)議的是_(1)_，按固定時間間隔和相鄰路由器交換路由表 信息的協(xié)議是_(2)_。該協(xié)議特點(diǎn)是_(3)_，它使用_(4)_傳輸信息。此協(xié)議報文長度、最多可包括 的路由數(shù)和距離分別是_(5)_。
(1)
A.IGP
B.RIP
C.OSPF
D.BGP
(2)
A.RIP
B.OSPF
C.IGP
D.EGP
(3)
A.功能強(qiáng)大
B.可用于大規(guī)模網(wǎng)絡(luò)
C.實(shí)現(xiàn)簡單，開銷小
D.故障率低
(4)
A.TCP
B.UDP
C.IP 層
D.應(yīng)用層
(5)
A.504 25 15
B.1500 25 16
C.504 32 15
D.1500 25 8
Flow control is a function that prevents network congestion by ensuring that _(6)_ do not overwhelm_(7)_ with data. There are three commonly used methods for handling network congestion . _(8)_is used by network devices to temporarily store bursts of excess data in memory until they can be processed. _(9)_ are used by receiving devices to help prevent their buffers from overflowing . _(10)_ 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.
(6)(7)
A.transmitting devices
B.transmitted devices
C.receiving devices
D.received devices
(8)(9)(10)
A.Buffer
B.Source-quench messages
C.window
D.Windowing
E.Buffering
答案：1-5 DACBA 6-10 ACEBD
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，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度恰好是其整數(shù)倍時，則文件傳輸完畢后，還必須在最后發(fā)送一個_(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.請求 PDU
D.無數(shù)據(jù)的數(shù)據(jù) PDU
SSL 主要用于 WWW 客戶與服務(wù)器之間傳送數(shù)據(jù)的進(jìn)行_(16)_。它位于_(17)_層之上，發(fā)送方接收_(18)_的 數(shù)據(jù)進(jìn)行加密，然后將加密數(shù)據(jù)送往_(19)_。_(20)_是專為在因特網(wǎng)上進(jìn)行安全信用卡交易的協(xié)議。
(16)
A.認(rèn)證
B.鑒別
C.加密和鑒別
D.數(shù)字簽名
(17)(18)
A.鏈路層
B.網(wǎng)絡(luò)層
C.傳輸層
D.應(yīng)用層
(19)
A.TCP 插口
B.UDP 插口
C.IP 層
D.應(yīng)用層
(20)
A.PGP
B.SET
C.PEM
D.MD5
答案：11-15 BCABD 16-20 CCDAB