HCSE交换试题集

exchange 和 load高考频度：★★★☆☆难易程度：★★☆☆☆1. I have offered to paint the house a week’s accommodation(食宿).A.with regard toB.in exchange forC.by means ofD.in place ofB【参考答案】2. Extra warmth from sunlight can put an additional ________on the air-conditioning system.A. weightB. anxietyC. loadD. tiredness【参考答案】C【归纳拓展】1. Independent study is not intended as a(n) ________ for reducing course-scheduling difficulties but as a meansfor exploring in greater depth academic subject matter.A. exchangeB. deviceC. suggestionD. reason2. Recent pressure at work may his abnormal behavior.A. push forB. exchange forC. account forD. head for3. Just accept the disabled for who they are, and give them ________ to live as rich and full a life as you do.A. earphoneB. encouragementC. equipmentD. exchange4. To the readers' disappointment, the leading article in this issue of the magazine is __________ rubbish.A. a load ofB. a great manyC. many aD. a number of1. B【解析】device n. 策略。

HSE-WLAN考试试题公司名称___________ 姓名_________ 职务____________联系电话___________ Email_________1.请说出H3C WLAN商业明星产品WX3024的技术特点：__A,B,C,D,E_______________________A．全千兆有线无线一体化交换机B．业界首款支持PoE+ 产品，为11n产品供电C．带24个千兆端口，支持10G上联口D．全面支持Web管理E．最高可管理24台AP2.H3C W A2220E-AG这款产品适合在______A__________________________场景中使用。

(单选)A．仓库、工厂车间B．医院C．沙漠无人区D．蒸汽桑拿房3.小巧、美观的W A 2110-AG是H3C WLAN产品唯一__B______的无线AP产品，因单AP成本较低，非常适合商业行业的应用。

（单选）A．带PoE功能B．仅能做Fit AP，不能进行FA T/FIT切换C．带有防水防尘防雷功能D．可以放在水里浸泡4.W A2220X-AGP的11a模块的发射功率是____毫瓦，11b/g模块的的发射功率是____毫瓦。

( C ) （单选）A．100，100 B．500，500C．100，500 D．500，1005.下面图片为H3C的网口防雷器，如果没有PoE交换机，该产品能够为H3C全系列AP产品进行PoE远程供电，那么连接AP的那个端口是哪个？____C____ （单选）6.请说出WLAN最新技术-802.11n技术特点_A,B,C,D,E,F__________。

A．无线速率显著提升B．覆盖范围更广C．MIMO技术的应用使得无线信号稳定性更高D．能兼容性802.11a/b/g终端E．在复杂环境中信号穿透能力更强F．单个AP用户接入数量更大7.下列对队W A2200X-AG的说法，哪个是错误的？(D) （单选）A．防水等级：IP65，可以直接对AP喷水B．工作温度：-40o C-- 65o CC．能同时支持802.11a和802.11g D．支持千兆光口上行，适应长距离部署8.WLAN市场需求的几个重要驱动力是：(A,B,D)A. 经济性B. 高效率C.易管理D.自由度9.Wimax将取代WLAN技术成为主要的无线接入技术。

Exam PaperName_________ Department__________ Score______ Part I Reading Comprehension (25%)Section ADirections: There is a passage with 10 blanks in this section. You are required to select one word for each blank from a list of choices given below. You may not use any of the wordsin the bank more than once.Many countries face a (1)________ more serious economic problem in the form of an (2)________ trade balance with other nations. Such an imbalance exists when the (3)________ valu e of a country’s imports exceeds that of its exports. For example, if a country buys $25 billion of products from other countries, yet sells only $10 billion of its own products overseas, its trade deficit is $15 billion. Many underdeveloped nations find themselves in this (4)________ because they lack natural resources or the industrial (5)________ to use these resources, and thus have to import raw materials or manufactured goods.One (6)________ of a trade deficit is the flow of currency out of a country. In the case of an underdeveloped nation, this can cause many financial difficulties, including failure to (7)________ debt payments and obstacles to (8)________ of an industrial base. Even in the case of a fully developed nation such as the United States, a large trade deficit is a reason for alarm. American products, made by well-paid workers in U.S. industries, (9)________ more to produce than those made in places like Asia, where labor and material costs are much lower. Money (10)________ on foreign products is money not spent on items produced by domestic industries.Section BDirections:There are 2 reading passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four suggestedanswers marked A), B), C) and D). Choose the best answer to each question. Questions 11 to 15 are based on the following passage:All of us rely on what we see. We say to ourselves, ‘I know, I was there; I saw it happen’ and that seems to settle the matter. Or does it? Can we really trust the evidence of our eyes?Take competitive sports. Fans who see the same game will not agree with each other and will disagree with the referee. ‘He was out of bounds when he caught the pass,’ says one fan. Says another, ‘You’re crazy. I saw it with my own eyes. He was five feet in bounds. You must be blind.’ The referee rules that the receiver did step out of bounds. But thousands of fans are still not convinced—because they were there!It’s the same story in the courtroom. Trial procedure depends on witnesses giving sworn testimony（证词）. But just how reliable is the testimony of a person who reports what he has seen? In a recent study, ten thousand witnesses were asked to describe the man they saw commit a crime. The study reveals that, on the average, the witnesses overestimated the man’s height by five inches, his age by eight years, and gave the wrong hair color in 83 percent of the cases. These witnesses didn’t play tricks on them!What can we do to keep error to a minimum? First of all, don’t let your emotions interfere with your vision. Don’t see something because you want to see it. Secondly, try to stay relaxed. If you are tense, you are liable to see red when the color is blue. And finally, it helps to make notes of what you see. Don’t rely on your memory alone. Take pictures, make recordings, and use any other aid to reduce distortion.11. The best statement of the main idea of this passage is that ________.A) all of us rely on what we seeB) sworn witnesses can hardly be trustedC) we can’t completely trust the evidence of our eyesD) eyewitnesses are unreliable12. The passage suggests that fans at sports events ________.A) are influenced by emotionB) are crazy about sportsC) lie about what they seeD) have no respect for the truth13. Statistical studies suggest that ________.A) courtroom testimony only confuses the juryB) in 83 percent of the cases, witnesses overestimate age by eight yearsC) witnesses are remarkably accurateD) testimony of people reporting what they see is often unreliable14. The word ‘them’ in the last line of paragraph 3 refers to ________.A) the eyes of the witnessesB) the sworn testimony given by the witnessesC) the members of the juryD) the height, age and hair color of the criminal15. To keep visual error to a minimum, all of the following are necessary EXCEPT ________.A) to stay calmB) to get close for a better lookC) not to let your emotions interfereD) to make notes of what you seeQuestions 16 to 20 are based on the following passage:Humans have long been studying the flight of birds and trying to imitate it. Not until the twentieth century did engineers fully understand the principles of flight that birds have been using for millions of years.Birds are adapted in their body structure, as no other creatures, to life in the air. Their wing, tails, hollow bones, and internal air sacs（气囊）all contribute to this great faculty. These adaptations make it possible for birds to seek out environments most favorable to their needs at different times of the year. This results in the marvelous phenomenon we know as migration—the regular, seasonal movement of entire populations of birds from one geographic location to another.Each year with great regularity most species of birds return to their summer homes, court（求偶）and choose mates, build their nests, lay eggs, and rear their young. In the late summer and fall they acquire their new plumage（羽毛）. Then they join with others of their kind in large and small flocks, feeding and storing up fat in their bodies. Thus they prepare for the hardships of winter, whether they remain in the cold northlands or make the strenuous journey to the south.16. The best title for this passage would be ________.A. Principles of FlightB. How Birds FlyC. The Annual Migration of BirdsD. The Body Structure of Birds17. We can know from the passage that ________.A. birds are built the same as other creaturesB. birds are built to flyC. birds need to migrate to surviveD. birds need to be told when to migrate18. It can be inferred from the second paragraph that ________.A. birds’ migration is generally with out purposeB. birds’ migration is merely out of their habitsC. most birds travel regularly for a change in their life patternD. birds are able to look for situations favorable to their existence19. Birds feed and store fat in their bodies ________.A. for use in rearing their youngB. for use in winterC. to be used when they return next summerD. to be used on their way south20. Which of the following is implied by the passage?A. The migration of birds is a ‘social’ undertaking.B. Each individual bird has its own pattern of migration.C. All birds fly south for the winter.D. Different kinds of birds join together in their migration.Section CDirections:There is one reading passage in this section. The passage is followed by fivestatements. Decide whether these statements are true or false according to thepassage. Write “T” for true and “F” for false in the brackets behind each statement.People have been interested in handwriting for a long time. The first book on the study of handwriting was written in 1632. Since then, hundreds of books have been published on the subject.Researchers believe that you can learn a lot about people’s personalities by looking at the way they write. Some of the characteristics they look at are slant —whether your letters point forward or backward, pressure —whether you press hard or only lightly on the paper, and the size of capital letters. Each of these characteristics can tell different personalities. For example, if you slant your letter forward, you are an outgoing, friendly person. If you press hard, you are a person with strong feelings. If you write small capital letters, then you are very shy.Researchers also look at which parts of the letters seem larger or more important. For this reason they have divided the letters into three parts. If the upper part of the letter is very large compared to the part in the middle, then the writer may be idealistic. If the lower part is very large, it shows that the writer is very interested in money and success. If all parts are well balanced, the writer is likely to be practical.The police have asked the researchers to help them solve crimes, and some companies have used handwriting to choose employees. So the next time you sit down to write a letter, fill in a form, or even write your name – be careful. You may be telling people more than you expect.21. Some companies began to use handwriting to choose employees more than 350 years ago.( )22. People who are easy to get excited tend to press hard on the paper when they write.( )23. If a person’s letters point forward, he is usually pleasant to get along with. ( )24. Most practical people make the lower part of the letter g and j very large. ( )25. The author seems to advise people to change their writing habits. ( )Part II Vocabulary and Structure (20%)Directions: For each of the following sentences there are four choices marked A), B), C) and D).Choose the one answer that best completes the sentence.1. I ________ the rush-hour traffic so much that I often avoid it by coming late to work.A) disappoint C) frightenB) disregard D) dread2. Because of the rain, his car swerved and ________ into a wall.A) smashed B) strokeC) dropped D) rushed3. The cost of the reconstruction would ________ from 2.5 to 3 million pounds.A) deserve B) rangeC) spend D) include4. It would be unwise to ________ too much importance to these opinion polls.A) stick B) applyC) attach D) mention5. Several people were reported to have suffered ________ and physical attacks.A) verbal B) bodilyC) sound D) spoken6. “Shall I help you with the washing up?” “Don’t ________ —I’ll do it later.”A) bother B) careC) trouble D) disturb7. The sudden rise in oil prices led to an economic ________ in the country.A) crash B) threatC) crisis D) danger8. How can I have any self-confidence when you’re always so ________ of me?A) serious B) criticalC) unpleasant D) mistaken9. Many women find it difficult to combine ________ a career with having children.A) chasing B) runningC) pursuing D) searching10. By the time I saw the job advertised it was already too late to ________.A) apply B) appointC) demand D) seek11. ________ what you intended, I should not have wasted my time trying to explain matters toyou.A) I had realized B) Had I realizedC) Realized had I D) Had realized I12. ________ her mind was made up on any subject, it was very hard to make her change.A) While B) OnceC) Although D) Whether13. It’s my advice that she _________ right now, or she might be late for the plane.A) start B) startsC) would start D) will start14. I’ll never forget ________ the Alps for the first time. The sight was so impressive.A) see C) seenB) to see D) seeing15. ________ the look on his face, he doesn’t quite understand what the speaker is saying.A) To judge by B) Judge byC) Judging by D) To be judged by16. I’ll never know all that was in his mind, ________.A) nor will anyone else either B) nor won’t anyone else tooC) nor anyone else will D) nor will anyone else17. Driving downtown to the stadium was easy. We got there quickly because there was ________traffic.A) a few B) a littleC) few D) little18. Sometimes earthquakes cause tidal waves and, ________ in the case of Japan, these can bedangerous.A) as C) such asB) like D) just like19. All the evidence pointed to the conclusion ________ he was guilty.A) which B) whetherC) that D) where20. If I couldn’t get a scholarship, I might get a job ________ to graduate school next seme ster.A) instead go B) instead goingC) instead to go D) instead of goingPart III Cloze (10%)Directions:There are 10 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). Choose the one answer that best fits into the passage.A contract is an agreement between two or more people (1) ________ one person agrees to do something by a specified date in return for something done by (2) ________. Usually the contract is a written document signed and dated by both (3) ________. It must state clearly the consideration, that is, what is to be given or done by one person in (4) _______ for what is given or done by the other. If one person does (5) ________ was promised and the other does not, that other may be sued in court and required by court order to make good. He or she (6) ________ also be required to pay for damages suffered as a result of the failure to perform. The things (7) ________by both parties must be stated in definite terms (8) ________ the court will hold that the contract is (9) ________ vague and general to be enforced. (10) ________, the time period within which the work is to be done must be definite or the court will say that the document is not a contract.1. A) in which C) whichB) that D) on that2. A) another C) otherB) the other D) others3. A) parts C) peopleB) parties D) aspects4. A) replace C) changeB) payment D) exchange5. A) that C) whatB) the thing D) something6. A) need C) hasB) ought D) may7. A) to be done C) to doB) done D) being done8. A) and C) orB) else D) so9. A) so C) tooB) rather D) over10. A) Similar C) The sameB) Similarly D) TooPart IV Translation (20%)Section ADirections: In this section there are some sentences from the reading passages. Translate them into Chinese. Refer to the related passages they are chosen from if necessary.1. The stud y reveals that, on the average, the witnesses overestimated the man’s height by fiveinches, his age by eight years, and gave the wrong hair color in 83 percent of the cases.___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ______2. Secondly, try to stay relaxed. If you are tense, you are liable to see red when the color is blue.___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ______3. Not until the twentieth century did engineers fully understand the principles of flight that birdshave been using for millions of years.___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ______4. Then they join with others of their kind in large and small flocks, feeding and storing up fat intheir bodies.___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ______5. Some of the characteristics they look at are slant —whether your letters point forward orbackward, pressure —whether you press hard or only lightly on the paper, and the size of capital letters.___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ ______Section BDirections:There are five sentences in this section. Translate them into English. Use the expressions in brackets if any.6. ______________________________________________________________（为了帮助她，凡是我能想到的都做了）, I don’t know what else to do.7. There are, _____________________________________________________（要是你不介意我这样说的话）, several problems with this idea of yours.8. The driver admitted that ________________________________________________（他不但没有上保险）, but he didn’t have a driving license either.9. ________________________________________________________________（这两个人中不管哪个偷了她的钱包）, she was determined to find out.10. ________________________________________________________（你应该试试照我建议的那样做）. I’m sure you’d find it much easier.。

题目1一个简单的公司网络场景,SW1和SW2为楼层交换机,PC-1和PC-3属于公司的部门A,PC-2和PC-4属于公司的部门B,PC-5属于部门A和部门B的上级部门C.在网络规划中,部门A属于VLAN 10,部门B属于VLAN 20,部门C属于VLAN 30.公司希望通过VLAN的划分和配置,使部门A和部门B均能够与部门C进行通信,但是部门A和部门B之间不能互相通信.题目2Host通过Switch接入网络,Gateway为企业出口网关,各Host均使用静态配置的IP 地址.管理员希望Host使用管理员分配的固定IP地址上网,不允许私自更改IP地址非法获取网络访问权限.题目1答案：步骤1：配置SW1vlan batch 10 20 30#interface GigabitEthernet0/0/1port link-type hybridport hybrid untagged vlan 10 30port hybrid pvidvlan 10#interface GigabitEthernet0/0/2port link-type hybridport hybrid untagged vlan 20 30port hybrid pvidvlan 20#interface GigabitEthernet0/0/24port link-type hybridport hybrid tagged vlan 10 20 30#步骤2：配置SW2vlan batch 10 20 30#interface GigabitEthernet0/0/1port link-type hybridport hybrid untagged vlan 10 30port hybrid pvidvlan 10#interface GigabitEthernet0/0/2port link-type hybridport hybrid untagged vlan 20 30port hybrid pvidvlan 20#interface GigabitEthernet0/0/3port link-type hybridport hybrid untagged vlan 10 20 30port hybrid pvidvlan 30#interface GigabitEthernet0/0/24port link-type hybridport hybrid tagged vlan 10 20 30#题目2答案：采用如下的思路在Switch上配置IPSG功能,实现上述需求.在Switch上配置Host_1和Host_2的静态绑定表,固定IP和MAC的绑定关系.在Switch连接用户主机的接口使能IPSG,实现Host只能使用管理员分配的固定IP 地址上网.同时,在接口开启IP报文检查告警功能,当交换机丢弃非法上网用户的报文达到阈值后上报告警.步骤1：创建Host_1和Host_2的静态绑定表项<HUAWEI> system-view[HUAWEI] sysname Switch[Switch] user-bind static ip-address 10.0.0.1 mac-address 0001-0001-0001 [Switch] user-bind static ip-address 10.0.0.11 mac-address 0002-0002-0002步骤2：使能IPSG并设置丢弃报文上报告警功能# 在连接Host_1的GE1/0/1接口使能IPSG和IP报文检查告警功能,当丢弃报文阈值到达200将上报告警.[Switch] interface gigabitethernet 1/0/1[Switch-GigabitEthernet1/0/1] ip source check user-bind enable[Switch-GigabitEthernet1/0/1] ip source check user-bind alarm enable[Switch-GigabitEthernet1/0/1] ip source check user-bind alarm threshold 200[Switch-GigabitEthernet1/0/1] quit# 在连接Host_2的GE1/0/2接口使能IPSG和IP报文检查告警功能,当丢弃报文阈值到达200将上报告警.[Switch] interface gigabitethernet 1/0/2[Switch-GigabitEthernet1/0/2] ip source check user-bind enable[Switch-GigabitEthernet1/0/2] ip source check user-bind alarm enable[Switch-GigabitEthernet1/0/2] ip source check user-bind alarm threshold 200 [Switch-GigabitEthernet1/0/2] quit步骤3：验证配置结果在Switch上执行display dhcp static user-bind all命令,可以查看静态绑定表信息. [Switch] display dhcp static user-bind allDHCP static Bind-table:Flags:O - outer vlan ,I - inner vlan ,P - Vlan-mappingIP Address MAC Address VSI/VLAN<O/I/P> Interface --------------------------------------------------------------------------------10.0.0.1 0001-0001-0001 -- /-- /-- --10.0.0.11 0002-0002-0002 -- /-- /-- ----------------------------------------------------------------------------------Print count: 2 Total count: 2Host_1和Host_2使用管理员分配的固定IP地址可以正常访问网络,更改IP地址后无法访问网络.。

华为HCIE-EnterpriseCommunication模拟试题及华为HCIE-Enterprise Communication模拟试题及答案1.(判断)音频信号的PCM音频流的码率计算方式为：采样率值×采样大小值×声道数。

2.(单选)在进行压缩编码前，1080P图像的一帧画面占用47Mb存储空间，那么其色彩位深为多少?( )。

A. 24bitB. 16bitC. 48bitD. 64bit3.(单选)RRJ sendto [(218.5.64.98:18616)] [59285094444] [[0x00000065:err_reg_wrong_account_or_password]]从以上日志可以看出注册失败可能原因是( )。

A. 账号密码错误B. 网段注册限制C. 网段带宽限制D. 通信线路异常4.(单选)如果GK支持H.225信令路由、但不支持H.245信令路由，以下哪条信令不过经过GK( )。

A. ARQB. SetupC. EndSessionD. Alerting5.(单选)在VoIP系统中，端到端的网络延迟低于( )时才能保证良好的通话效果。

A. 50msB. 250msC. 400msD. 500ms6.(单选)会议中的终端收到下面哪条信令消息时，不会挂断该呼叫?( )。

A. closeLogicChannelB. DRQC. Release CompleteD. endSession7.(多选)关于标清彩色电视制式PAL制说法正确的是( )。

A. 采用该制式的国家有德国、英国、中国等B. 扫描线每帧625行C. 扫描方式为隔行扫描D. 图像帧率为29帧每秒8.(单选)一种编解码速率为64kbps，打包时长为20ms，请问该编解码占用的IP带宽是( )kbps。

(注：IP/UDP/RTP报头为40 Bytes,此处1kbps=1000bps)。

A. 83.6B. 76.6C. 90.4D. 809.(多选)终端发起呼叫，向GK发送了ARQ消息后，收到了ARJ 消息，呼叫被拒绝可能的原因为( )。

exchange 和 load高考频度：★★★☆☆难易程度：★★☆☆☆1. I have offered to paint the house a week’s accommodation(食宿).A.with regard toB.in exchange forC.by means ofD.in place ofB【参考答案】2. Extra warmth from sunlight can put an additional ________on the air-conditioning system.A. weightB. anxietyC. loadD. tiredness【参考答案】C【归纳拓展】1. Independent study is not intended as a(n) ________ for reducing course-scheduling difficulties but as a meansfor exploring in greater depth academic subject matter.A. exchangeB. deviceC. suggestionD. reason2. Recent pressure at work may his abnormal behavior.A. push forB. exchange forC. account forD. head for3. Just accept the disabled for who they are, and give them ________ to live as rich and full a life as you do.A. earphoneB. encouragementC. equipmentD. exchange4. To the readers' disappointment, the leading article in this issue of the magazine is __________ rubbish.A. a load ofB. a great manyC. many aD. a number of1. B【解析】device n. 策略。

HCIA-交换技术介绍试题及答案1. “网络管理员在三层交换机上创建了 VLAN 10，并在该 VLAN 的虚拟接口下配置了 IP 地址。

当使用命令“display ip interface brief" 查看接口状态时，发现 VLANIF 10 接口处于down 状态，则应该通过怎样的操作来使得 VLANIF 10 接口恢复正常？ [单选题] *A. 将一个状态必须为 Up 的物理接口划进 VLAN 10(正确答案)B.将一个状态必须为 Up 且必须为 Trunk 类型的接口划进 VLAN 10C.将任意物理接口划进 VLAN 10D. 在 VLANIF 10 接口下使用命令“ undo shutdown"2. IEEE802.1Q 定义的 TPID 的值为多少？ [单选题] *A. 0x9100B.0x8200C.0x7200D. 0x8100(正确答案)3. IEEE802.1Q 定义的 VLAN 帧格式总长度为多少字节？ [单选题] *A. 4(正确答案)B.3C.2D. 14. MAC 地址表不包括？ [单选题] *A. 端口号B.VlanC.IP 地址(正确答案)D. MAC 地址5. RSTP 配置 BPDU 报文中的 Type 字段取值为？ [单选题] *A. 0x03B.0x01C.0x00D. 0x02(正确答案)6. RSTP 协议不包括以下哪个端口状态？ [单选题] *A. ForwardingB.LearningC.DiscardingD. Blocking(正确答案)7. RSTP 协议存在几种端口状态？ [单选题] *A. 1B.3(正确答案)C.4D. 28. RSTP 协议使用 P/A 机制加快了上游端口转到 Forwarding 状态的速度，但是却没有出现临时环路的原因是什么？ [单选题] *A. 缩短了 Forward Del ay 的时间B.引入了边缘端口C.加快了端口角色选举的速度D. 通过同步机制保证不会出现临时环路(正确答案)9. RSTP 协议中，当根端口失效的情况下，（）就会快速转换为新的根端口并立即进入转发状态？ [单选题] *A. Forwarding 端口B.Alternate 端口(正确答案)C.Backup 端口D. Edge 端口10. STP 协议中端口处于哪个工作状态时可以不经过其它状态转为 Forwarding 状态？ [单选题] *A. ListeningB.Learning(正确答案)C.DisabledD. Blocking11. 包含以太网头部的 Ethernet_II 帧的长度为？ [单选题] *A. 64-1518B(正确答案)B.60-1560BC.46-1500BD. 64-1500B12. 当采用 LACP 横式进行链路聚合时,华为交换机的默认系统优先级是？ [单选题] *A. 36864B.24576C.4096D. 32768(正确答案)13. 当主机经常移动位置时，使用哪种 VLAN 划分方式最合适？ [单选题] *A. 基于端口划分B.基于 IP 子网划分C.基于 MAC 地址划分(正确答案)D. 基于策略划分14. 二层以太网交换机根据端口所接收到报文的（）生成 MAC 地址表选项。

第7篇以太网交换技术第28章以太网交换基本原理1. XYZ 公司网络如图所示。

其中Router 上没有配置任何逻辑接口；所有的主机之间均可以正常通信。

则此网络中有_____个广播域。

（请填写阿拉伯数字）Answer: 2* 主要理解hub、router和switch的功能，hub是集线器，虽说是星型结构，但是内部是总线结构，所有接口共享带宽，所以它属于同一广播域；switch是交换机，图中所示L2是二层交换机，二层交换可以隔离冲突域，但是不能隔离广播域；router是路由器，路由器是三层设备，路由器默认是不转发广播的，所以此题的广播域只有两个2. XYZ 公司网络如图所示。

其中Router 上没有配置任何逻辑接口；所有的主机之间均可以正常通信。

则此网络中有_____个冲突域。

（请填写阿拉伯数字）Answer: 6*主要理解hub、router和switch的功能，hub是集线器，虽说是星型结构，但是内部是总线结构，所有接口共享带宽，所以它属于同一冲突域；switch是交换机，图中所示L2是二层交换机，二层交换可以隔离冲突域，但是不能隔离广播域；router是路由器，路由器是三层设备，路由器默认是不转发广播的，但路由器的每隔接口是一个冲突域。

3. 二层以太网交换机在MAC 地址表中查找与帧目的MAC 地址匹配的表项，从而将帧从相应接口转发出去，如果查找失败，交换机将______。

A. 把帧丢弃B. 把帧由除入端口以外的所有其他端口发送出去C. 查找快速转发表D. 查找路由表Answer: B* 1、无论是单播、组播、广播帧，如果帧的目的MAC地址在MAC地址表中存在，且表项所关联的端口与接收到帧的端口相同时，则交换机对此帧进行过滤，即不转发此帧；2、对于未知的单播帧(即帧的MAC地址在交换机MAC地址表中无相应表项)、组播帧、广播帧，则除源端口外的其它端口转发出去。

4. 交换机上的以太帧交换依靠MAC 地址映射表，这个表可以通过______来建立。