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一、綜合知識：

1、 在以下網(wǎng)絡(luò)應(yīng)用中，要求帶寬最高的應(yīng)用是 ( ) 。

A、可視電話

B、數(shù)字電視

C、撥號上網(wǎng)

D、收發(fā)郵件

信管網(wǎng)參考答案：B

查看解析：m.xiexiliangjiufa.com/st/84712917.html

2、 dom is a platform- and language- (1) api that allows programs and scripts to dynamically access and update the content, structure and style of www documents(currently, definitions for html and xml documents are part of the specification). the document can be further processed and the results of that processing can be incorporated back into the presented (2) . dom is a (3) -based ap1 to documents, which requires the whole document to be represented in (4) while processing it. a simpler alternative to dom is the event-based sax, which can be used to process very large (5) documents that do not fit into the memory available for processing.

(1)A、specific

B、neutral

C、contained

D、related

(2)A、text

B、image

C、page

D、graphic

(3)A、table

B、tree

C、control

D、event

(4)A、document

B、processor

C、disc

D、memory

(5)A、xml

B、html

C、script

D、web

信管網(wǎng)參考答案：B、C、B、D、A

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3、 melissa and loveletter made use of the trust that exists between friends or colleagues. imagine receiving an (1 ) from a friend who asks you to open it. this is what happens with melissa and several other similar email (2) . upon running, such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages (3) .

as administrators seek to block dangerous email attachments through the recognition of well-known (4) , virus writers use other extensions to circumvent such protection. executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.

frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (5) access to your network.

(1)A、attachment

B、packet

C、datagram

D、message

(2)A、virtual

B、virus

C、worms

D、bacteria

(3)A、memory

B、caches

C、ports

D、registers

(4)A、names

B、cookies

C、software

D、extensions

(5)A、cracker

B、user

C、customer

D、client

信管網(wǎng)參考答案：A、C、B、D、A

查看解析：m.xiexiliangjiufa.com/st/84732917.html

二、案例分析：

閱讀以下說明，回答問題1 至問題5，將解答填入答題紙對應(yīng)的解答欄內(nèi)。

【說明】

某小區(qū)采用hfc 接入internet 的解決方案進行網(wǎng)絡(luò)設(shè)計，網(wǎng)絡(luò)結(jié)構(gòu)如圖1-1 所示。

【問題1】(3分)

網(wǎng)絡(luò)設(shè)計流程通常由以下五階段組成：

a.確定網(wǎng)絡(luò)物理結(jié)構(gòu)

b.確定網(wǎng)絡(luò)邏輯結(jié)構(gòu)

c.對現(xiàn)有網(wǎng)絡(luò)的體系結(jié)構(gòu)進行分析

d.安裝和維護

e.需求分析

根據(jù)網(wǎng)絡(luò)開發(fā)設(shè)計的過程，給出上述五個階段的先后排序：___(1)___。

【問題2】(5分)

為圖1-1 中(2)～(6)處選擇對應(yīng)的設(shè)備名稱，填入答題紙對應(yīng)的解答欄內(nèi)。

備選設(shè)備：cmts、以太網(wǎng)交換機、光收發(fā)器、光電轉(zhuǎn)換節(jié)點、cable modem

【問題3】(2分)

在答題紙對應(yīng)的解答欄內(nèi)填寫圖1-1 中(7)、(8)處對應(yīng)的傳輸介質(zhì)。

【問題4】(3分)

cable modem 接收從cmts 發(fā)送來的___(9)___調(diào)制信號，經(jīng)解調(diào)后重建以太幀。在相反方向上，接收到的以太幀被封裝在時隙中，經(jīng)___(10)___調(diào)制后，通過hfc 網(wǎng)絡(luò)的上行信道傳送給cmts。

(9)

a.qam

b.qpsk

c.gmsk

d.dmt

(10)

a.qam

b.qpsk

c.gmsk

d.dmt

【問題5】(2分)

有線電視hfc 網(wǎng)絡(luò)的上、下行信道是非對稱的，容易產(chǎn)生噪聲、影響傳輸質(zhì)量的是上行信道還是下行信道?

信管網(wǎng)參考答案：

【問題1】[3分]

(1)ECBAD

【問題2】[5分]

(2)以太網(wǎng)交換機

(3)CMTS

(4)光收發(fā)器

(5)光電轉(zhuǎn)換節(jié)點

(6)Cable Modem

【問題3】[2分]

(7)光纖

(8)CATV電纜(或回答同軸電纜)

【問題4】[3分]

(9)A

(10)B

【問題5】[2分]

上行信道

查看解析：m.xiexiliangjiufa.com/st/290514055.html