跪求一遍关于计算机网络的英语作文..字数在1200以上的.. 用英语作文写计算机网络对学校的变化
\u6025\u6c42\uff01\u8ba1\u7b97\u673a\u7f51\u7edc\u4e13\u4e1a\u82f1\u8bed\u4f5c\u6587\uff0c\u4e0d\u8d85\u8fc7150\u5b57\u3002\u5185\u5bb9\u5173\u4e8e\u8ba1\u7b97\u673a\u7684\u7ec4\u6210\u3002\u4f60\u76f4\u63a5\u5728\u7f51\u4e0a\u627e\u4e00\u6bb5\u5427\uff0c\u6709\u5f88\u591a\u7684\u3002
i come from a middle school in west of china. most of chinese maybe guess how backward it is, shabby hut, no playground, let alone a library. BUT i should say your imagination is wrong. RECENTLY my school has change a lot .we have a new teaching building ,and a big library ,a new computer lab. they installed network too.now we can surf web in classroom. it is convenient for teaching work. we can acquire more information from it and it promote our communication with outside , we can talk with a man from a remote place , we can watch vedio we are interesting. it expands our view and enriches our life. oh, the world is so wanderful.we are not fraid we are in a corner and location cause an estrangement between we and our parents outside. so we are lucky and happy . we decide to study hard and wish more progress
Computer networksNow every almost have computers, and computer good does have its downside - it depends on how you use. If you want to ask me: I on the computer do what, I can tell you, I will do a lot of things in the computer. May first and have out-of-town relatives chat, then can check information, listening to music, watching movies, paint... My favorite on the computer music and watching movies, because it very relaxing my mood.But the most people used compter to surf the internet.Now Let us know about the computer network
Ⅰ.Introduction
Computer networks,the wide spread sharing of information among groups of computers and their users,are a central part of the information age.The popular adoption of the personal computer(PC)
and the local area network (LAN) during the 1980s has led to the capacity to access information on a distant database;download an application from overseas;send a message to a friend country;and share files with a colleague-all from a personal computer.
The network that allow all this to be done so easily are sophisticated and complex entities.They rely for their effectiveness on many cooperating computers.The design and deployment of the wordwide computer network can be viewed as one of the great technological wonders of recent decades. Nowadays Intemet is very popular all over the world, especially in some big cities. Do you know when the Intemet was first established? Built in 1960s, the Internet was a crude network of a few computers which shared information. If one of the computers broke down, the whole networks would be unable to work, causing continual problems. At first, just the government had access to the Internet, using it for communications among different branches. However, by 1970s the Internet had been used in universities, banks, and hospitals. At the beginning of 1990s computers became affordable for common people and this affordability increased the use of the Internet by people,It is said that each day tens of millions of people log off, making it the most important part of people's life.
Ⅱ.Local Area Network
One of the most dramatic events in computer networking has been the introduction and rapid growth of local area network(LAN) as a way to standardize the system of linking computers used in office systems.As the name suggests,this is a means of connecting a number of computing elements together.At the simplest level,a LAN provides no more more than a shared medium (such as a coaxial cable to which all computers and printers are connected) along with a set of rules that govern the access to that medium.The most widely used LAN,Ethernet,used a mechanism called Carrier Sense Multiple Access-Collosion Detect(CSMA-CD).This means that each connected device can only use the cable when it has established that each connected device is using it.If there is contention, the device looking for a connection backs off and tries again later.The Ethernet transfers data at 10M bits/sec,which is fast enough to make the distance between devices insignificant.They appeat to be connected directly to their destination.
There are many different layouts(such as bus ,star,ring,see Figure 6A-2)and a number of different access protocols for LANs.Despire this variety,all LANs share the feature that they are limited in range (typically they cover one building) and are fast enough to make the connecting network invisible to the devices that use it.
In addition to providing shared access,modern LANs can also give users a wide range of sophisticated facilities.Managenment software packages are available to control the way in which devices are configured on the local area network (LAN),how users are administered,and how network resources are controlled.A widely adopted structure o local network is to have a number of servers that are available to a (usuallu much greater) nember of clients.The former,usually powerful computers,provide service such as print control,file sharing,and mail to the latter,which are usually personal computers.
Ⅲ.Routers and brideges
The facilities on most local area network (LAN) are very powerful.Most organizatonns do not wish to have small isolated islands of computing facilities.They usually want to extend facilities over a wider area so that groups can wok wtthout having to be located.Routers and bridges arespecialized devices that allow two or more local area network (LAN) to be connected.The bridges is the more basic device and can only connect local area network (LAN) of the same type.The router is a more intelligent component that can interconnent many different types of computer network.
Many large companies have corporate adta network that are founded on a collection of local area network (LAN) and routers.From the user’s point of view,this arrangement provides them with a physically diverse network that looks like one coherent resource.
Ⅳ.Wide Area Networks
At some point,it becomes impractical to extend a local area network (LAN) any further.Physical limitation sometimes drives this,but more often than not there are more concenient or cheaper ways to extend a computer network.Two major components in most real computer networks are the public telephone and data networks.These provide long-distance links that extend a local area network (LAN) into a wide area network (WAN).Nearly all of the national network operators offer services for the interconnection of computer networks.These services range from simple, low speed data links that work over the public telephone network to sophisticaied high speed data services that are ideally suited to the interconnection of LANs.These high speed data services are usually referred to as broadband connection.It is anticiopated that they will provide the necessary links between LANs that make what is called the information superhighway a reality.
Computer networks
Now every almost have computers, and computer good does have its downside - it depends on how you use. If you want to ask me: I on the computer do what, I can tell you, I will do a lot of things in the computer. May first and have out-of-town relatives chat, then can check information, listening to music, watching movies, paint... My favorite on the computer music and watching movies, because it very relaxing my mood.But the most people used compter to surf the internet.Now Let us know about the computer network
Ⅰ.Introduction
Computer networks,the wide spread sharing of information among groups of computers and their users,are a central part of the information age.The popular adoption of the personal computer(PC)
and the local area network (LAN) during the 1980s has led to the capacity to access information on a distant database;download an application from overseas;send a message to a friend country;and share files with a colleague-all from a personal computer.
The network that allow all this to be done so easily are sophisticated and complex entities.They rely for their effectiveness on many cooperating computers.The design and deployment of the wordwide computer network can be viewed as one of the great technological wonders of recent decades. Nowadays Intemet is very popular all over the world, especially in some big cities. Do you know when the Intemet was first established? Built in 1960s, the Internet was a crude network of a few computers which shared information. If one of the computers broke down, the whole networks would be unable to work, causing continual problems. At first, just the government had access to the Internet, using it for communications among different branches. However, by 1970s the Internet had been used in universities, banks, and hospitals. At the beginning of 1990s computers became affordable for common people and this affordability increased the use of the Internet by people,It is said that each day tens of millions of people log off, making it the most important part of people's life.
Ⅱ.Local Area Network
One of the most dramatic events in computer networking has been the introduction and rapid growth of local area network(LAN) as a way to standardize the system of linking computers used in office systems.As the name suggests,this is a means of connecting a number of computing elements together.At the simplest level,a LAN provides no more more than a shared medium (such as a coaxial cable to which all computers and printers are connected) along with a set of rules that govern the access to that medium.The most widely used LAN,Ethernet,used a mechanism called Carrier Sense Multiple Access-Collosion Detect(CSMA-CD).This means that each connected device can only use the cable when it has established that each connected device is using it.If there is contention, the device looking for a connection backs off and tries again later.The Ethernet transfers data at 10M bits/sec,which is fast enough to make the distance between devices insignificant.They appeat to be connected directly to their destination.
There are many different layouts(such as bus ,star,ring,see Figure 6A-2)and a number of different access protocols for LANs.Despire this variety,all LANs share the feature that they are limited in range (typically they cover one building) and are fast enough to make the connecting network invisible to the devices that use it.
In addition to providing shared access,modern LANs can also give users a wide range of sophisticated facilities.Managenment software packages are available to control the way in which devices are configured on the local area network (LAN),how users are administered,and how network resources are controlled.A widely adopted structure o local network is to have a number of servers that are available to a (usuallu much greater) nember of clients.The former,usually powerful computers,provide service such as print control,file sharing,and mail to the latter,which are usually personal computers.
Ⅲ.Routers and brideges
The facilities on most local area network (LAN) are very powerful.Most organizatonns do not wish to have small isolated islands of computing facilities.They usually want to extend facilities over a wider area so that groups can wok wtthout having to be located.Routers and bridges arespecialized devices that allow two or more local area network (LAN) to be connected.The bridges is the more basic device and can only connect local area network (LAN) of the same type.The router is a more intelligent component that can interconnent many different types of computer network.
Many large companies have corporate adta network that are founded on a collection of local area network (LAN) and routers.From the user’s point of view,this arrangement provides them with a physically diverse network that looks like one coherent resource.
Ⅳ.Wide Area Networks
At some point,it becomes impractical to extend a local area network (LAN) any further.Physical limitation sometimes drives this,but more often than not there are more concenient or cheaper ways to extend a computer network.Two major components in most real computer networks are the public telephone and data networks.These provide long-distance links that extend a local area network (LAN) into a wide area network (WAN).Nearly all of the national network operators offer services for the interconnection of computer networks.These services range from simple, low speed data links that work over the public telephone network to sophisticaied high speed data services that are ideally suited to the interconnection of LANs.These high speed data services are usually referred to as broadband connection.It is anticiopated that they will provide the necessary links between LANs that make what is called the information superhighway a reality.
绛旓細闅忕潃璁＄畻鏈鎶鏈拰浜掕仈缃戠殑鍙戝睍,鎴戜滑鎷ユ湁浜嗕竴绉嶅彲浠ヤ簡瑙ｅ鐣岀殑鏂板獟浣,鎴戜滑鐨勭敓娲讳篃鍥犱簰鑱旂綉鑰屽彂鐢熶簡宸ㄥぇ鐨勫彉鍖栥傛垜浠棩甯告棦鍙互浜嗚В鍥藉唴鏂伴椈,涔熷彲浠ヨ鐪嬪浗闄呮柊闂汇傚綋鐒,浣犱篃鍙互缁欎綘鐨勬湅鍙嬪彂鐢靛瓙閭欢銆備綘鍙互鍦ㄧ綉涓婂涔犱换浣曚綘鍠滄鐨勪笢瑗,姣斿鑻辫鍜屽叾浠栫鐩傚悓鏃,浣犺繕鍙互娆ｈ祻闊充箰,浣撹偛鍜屾父鎴忋傛渶杩,杩樻湁瓒婃潵瓒婂鐨勪汉瀵...
绛旓細3銆丳laying games on the Internet makes your hands agile, improves your typing level and the application of computer knowledge.璇戞枃锛氫笂缃戠帺娓告垙璁╁弻鎵嬪彉寰楁晱鎹枫佹彁楂樻墦瀛楁按骞冲拰鐢佃剳鐭ヨ瘑鐨勫簲鐢ㄣ4銆乀he Internet can make more friends and enhance social skills.璇戞枃锛氱綉缁滃彲浠ョ粨璇嗘洿澶氱殑鏈嬪弸锛屽寮虹ぞ...
绛旓細Behind all this glowing talk, however, are some problems. Internet makes people passive by stopping them making their own entertainment. So much so that when there is a breakdown or jam, people may find that World Wide Web turns into World Wide Wait. What is worse, some children...
绛旓細With the rapid process of modernization, computer becomes more and more popular.Nowadays, almost every family has a computer.Because of computers, our daily life is improving.闅忕潃鐜颁唬鍖栬繘绋嬬殑鍔犲揩锛璁＄畻鏈鍙樺緱瓒婃潵瓒婂彈娆㈣繋銆傚浠婏紝鍑犱箮姣忎釜瀹跺涵閮芥湁涓鍙扮數鑴戙傚洜涓鐢佃剳鐨鍘熷洜锛屾垜浠殑鏃ュ父鐢熸椿寰楀埌...
绛旓細It is said that each day tens of millions of people log on the Internet.Sending e-mails is becoming more and more popular.The Internet has become the mostimportant part of people's life.浜掕仈缃 浜掕仈缃戝缓浜20涓栫邯60骞翠唬銆傞偅鏃讹紝璁＄畻鏈哄張澶у張璐碉紝缃戠粶涓嶈兘寰堝ソ鍦拌繍琛屻傚鑾卞叾涓竴鍙版満鍣...
绛旓細Computer networks Now every almost have computers, and computer good does have its downside - it depends on how you use. If you want to ask me: I on the computer do what, I can tell you, I will do a lot of things in the computer. May first and have out-of-town ...
绛旓細we can obviously see the advantages of the Internet. It has become the leading role on the science stage. 澶у閮界煡閬擄紝浜掕仈缃瀵规垜浠湪鐜颁唬绀句細涓殑鐢熸椿鏈夊法澶х殑褰卞搷銆傞鍏堬紝鎴戜滑鍙互鑷敱鍦版矡閫氾紝浠讳綍浜烘棤璁鸿韩鍦ㄤ綍澶勶紝鍙浣犳墜杈规湁涓鍙璁＄畻鏈锛屽氨鍙笌鎴戜滑鐨勬湅鍙嬫矡閫氥傚叾娆★紝鍑犱箮鎵鏈夋偍鎯宠鐨勪俊鎭...
绛旓細Thus锛宨t is necessary for us to use internet in a reasonable way and restrain from overindulgence. After all锛宨nternet is invented to enrich our life锛宎nd to improve the efficiency of our work rather than shackle us with a chain.鍥犳锛屾垜浠湁蹇呰浠ヤ竴绉嶅悎鐞嗙殑鏂瑰紡鏉ヤ娇鐢ㄥ洜鐗圭綉锛岃屼笖...
绛旓細2銆丱n the other hand, studying online also saves a lot of money. Without the large spend on the education and the fees on other sides, many families struggle to pay for their children鈥檚 educational cost. Studying online costs little, even for free.鍙︿竴鏂归潰锛岀綉涓婂涔犱篃鍙互鑺傜渷...
绛旓細璺眰鑻辫浣滄枃:涓昏鍐呭鏄氦閫氬畨鍏ㄩ棶棰樸 Automobile,the most pervasive and persuasive of modern technologies,marked by rapid change and growth ,is moving into a new era,an era of extraordinary sophistication and versatility, which promises to reshape our lives and our world.Discussion on the duality ...
