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here our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻,天空是陰暗的,空氣里有著剛下過雨之后的清新因子。想要的,不想要的,界限明確,好像沒有什么可以撼動自己。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。s governing body, has also ordered an immediate investigation into the referee39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept it. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。網(wǎng)絡(luò)的建設(shè)需 要采取分步驟、分階段、分主次的設(shè)計實施思路;同時,還需要重視管理的作用,尤其是管理制度在網(wǎng)絡(luò)運營中的作用。 內(nèi)部 IP: 外部 IP: 23 4 系統(tǒng)總結(jié) 本文所構(gòu)建的 網(wǎng)絡(luò)適合中小規(guī)模企業(yè),在此基礎(chǔ)上,適當降低設(shè)備和系統(tǒng)配置,可以用在工作組級別的機構(gòu)上;而提高硬件和軟件系統(tǒng)的級別,也可以擴充到大型企業(yè)級規(guī)模。 PAP 雖然有著用戶名和密碼是明文發(fā)送的弱點,但是認證只在鏈路建立初期進行,因此節(jié)省了寶貴的鏈路帶寬。 PAP 認證進程只在雙方的通信鏈路建立初期進行。傳統(tǒng) PSTN 提供的服務(wù) 也被稱為簡易老式電話業(yè)務(wù)( Plan Old Telephone System, POTS)。 應(yīng)只允許來自服務(wù)器群的 IP 地址訪問并配置路由器。用戶在使用 tel 登錄網(wǎng)絡(luò)設(shè)備或服務(wù)器時所使用 的用戶名和口令在網(wǎng)絡(luò)中是以明文傳輸?shù)模苋菀妆痪W(wǎng)絡(luò)上的非法協(xié)議分析設(shè)備截獲。一個設(shè)計良好的訪問控制列表不僅可以起到控制網(wǎng)絡(luò)流量、流向的作用,還可以在不增加網(wǎng)絡(luò)系統(tǒng)軟、硬件投資的情況下完成一般軟、硬件防火墻產(chǎn)品的功能。 ( 1)定義 NAT 內(nèi)部、外部接口 Ip nat inside 定義端口為內(nèi)部端口; Ip nat outside 定義端口為外部端口。其中,下一跳指定從本路由器的接口 serial 0/0/0 送出。它通過 添加 WIC2T 模塊 上帶的 串行接口 serial 0/0使用 DDN( 128K)技術(shù)接入 Inter。這里使用了一條缺省路由命令,如圖所示。 16 完整命令為: vtp mode client 4. 配置核心層交換機 CoreSwitch1 的端口參數(shù) 核心層交換機 CoreSwitch1 通過自己的端口 FastEther 0/22 同廣域網(wǎng)接入模塊( Inter 路由器)相連。 15 此 外 ,分 布層 交 換機 DistributeSwitch2 還 通過 自 己的 千兆 端 口GigabitEther1/1 上連到核心交換機 CoreSwitch2 的 GigabitEther 0/1。 為了實現(xiàn)冗余設(shè)計,分布層交換機 DistributeSwitch1 還通過自己的千兆端口 GigabitEther 1/2 連接另一臺到分布層交換機 DistributeSwitch2 的GigabitEther 1/2。當激活了 VTP 剪裁功能以后,交換機將自動剪裁本交換機沒有定義的 VLAN 數(shù)據(jù)。每一個 VTP 管理域都有一個共同的 VTP 管理域域名。我們常采用 VLAN 中繼協(xié)議( Vlan Trunking Protocol, VTP)來解決這個問題。 分布層交換服務(wù)的 實現(xiàn)-配置分布層交換機 分布層除了負責將接入層交換機進行匯集外,還為整個交換網(wǎng)絡(luò)提供 VLAN間的路由選擇功能。設(shè)置為快速端口的端口當交換機啟動或端口有工作站接入時,將會直接進入轉(zhuǎn)發(fā)狀態(tài),而不會經(jīng)歷阻塞、偵聽、學(xué)習(xí)狀態(tài)(假設(shè)橋接表已經(jīng)建立) 。 9 Swi 為 switchport 的縮寫, mo 為 mode 的縮寫, acc 為 access 的縮寫。以后都將使用這些縮寫。但是,為了使網(wǎng)絡(luò)管理人員可以從遠程登錄到接入層交換機上進行管理,必要給接入層交換機設(shè)置一個管理用 IP 地址。在設(shè)置的時間內(nèi),如果沒有檢測到鍵盤輸入, IOS 將斷開用戶和交換機之間的連接。 其中 h 是 hostname 的簡寫,(在真實環(huán)境中也 支持簡寫)可以用該命令實現(xiàn)設(shè)備的重命名。 網(wǎng)絡(luò)拓撲如下圖所示: 6 3 網(wǎng)絡(luò)詳細設(shè)計及配置 這里我將使用思科的一款虛擬軟件( cisco packet tracer)完成配置,該軟件功能有限,一些配置并不能在該軟件上實現(xiàn)。 VLAN 和廣播域在分布層聚合在一起,需要支持路由選擇、過濾和安全 。為提高核心 網(wǎng)絡(luò)的健壯性,實現(xiàn)鏈路的安全保障,本方案骨干核心層中可以采用 VRRP( 熱備用路由器協(xié)議 )。而如果采用扁平化和網(wǎng)狀設(shè)計,任何一個節(jié)點的變動都將對整個網(wǎng)絡(luò)產(chǎn)生很大影響。 7) 實用性: 實用性設(shè)計應(yīng)能滿足目前對網(wǎng)絡(luò)應(yīng)用 的要求,充分實現(xiàn)內(nèi)部管理、信息化等要求,使網(wǎng)絡(luò)的整體性能盡快得到充分的發(fā)揮,并且便于掌握。 3) 可靠性: 系統(tǒng)及網(wǎng)絡(luò)結(jié)構(gòu)較為復(fù)雜,同時在部分子系統(tǒng)中存在較高的技術(shù)性,因此必須保證系統(tǒng)的穩(wěn)定、可靠和安全運行,具有很高的MTBF(平均無故障工作時間 )和極低 的 MTBR(平均無故障率 ),提高容錯設(shè)計,支持故障檢測和恢復(fù),可管理性強。 QoS(服務(wù)質(zhì)量保證 )是保證向網(wǎng)絡(luò)業(yè)務(wù)提供有品質(zhì)的服務(wù)。 IP 地址和域名。 本文根據(jù)網(wǎng)絡(luò)構(gòu)建的原則,從技術(shù)基礎(chǔ)、方案選擇、構(gòu)建方法等方面對組建一個中小型企業(yè)網(wǎng)絡(luò)進行了分析,在此基礎(chǔ)上構(gòu)建了網(wǎng)絡(luò)的拓撲結(jié)構(gòu),并 進行了詳細的設(shè)計及配置,為一些類似的企業(yè)公司的網(wǎng)絡(luò)建設(shè)提供了一個可供參考的模板。 II Abstract With the development of modern technology and puter technology and munication technology bined with, the puter seems to have bee essential equipment for each enterprise. More than half of enterprises have their own work. Enterprise work can not only provide us with a modern, efficient, fast and safe office environment, but also highspeed data transfer and production automation. According to the construction principles, the hardware and software of posing small and mediumsized enterprises works are analyzed from the aspects such as technological base, Scheme selection and construction method. On the basis of above, the work topology is constructed. And carried out detailed design and configuration. It can be the reference pattern for similar instances. Finally, the practical experience in the process of work construction is summarized and discussed. Key words: work。 網(wǎng)絡(luò)平臺的特點 網(wǎng)絡(luò)平臺是企業(yè)信息化的核心,要求具有高可靠性、高性能、良好可擴展性以及端到端的 QoS 服務(wù)質(zhì)量保證。在網(wǎng)絡(luò)應(yīng)用日趨復(fù)雜的環(huán)境下,如何在有限的網(wǎng)絡(luò)資源里