0101ccna互聯(lián)網(wǎng)概述(參考版)
2025-02-15 21:11本頁(yè)面
【正文】 2023, Cisco Systems, Inc. All rights reserved. ICND — 060 1. What are some of the advantages of using the OSI model in a working environment? 2. Describe the encapsulation process. 3. How many broadcast and collision domains are on a hub? 問(wèn)題復(fù)習(xí) 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 058 Use the product selection tool to select Cisco Equipment 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 056 Selection Issues: ? Need for 10 Mbps, 100 Mbps, or 1000 Mbps on media ? Need for trunking(中繼 )and interswitch links ? Workgroup segmentation (VLANs) ? Port density needs ? Different user interfaces Desktop/Workgroup Solutions Wiring Closet/Backbone Solutions Cisco 1548 Micro Switch 10/100 Catalyst 3000 series Catalyst 2900 series XL Catalyst 1900/2820 series Catalyst 2900 series Catalyst 5000 series Catalyst 8500 series Catalyst Switch Products 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 054 1544 128 64 56 Determine applications that you want to run ISDN, Frame Relay Old Modem Tel New Modem Web Browsing Voice Video, Multimedia EMail, File Transfer Leased Line, Frame Relay, XDSL kbps 產(chǎn)品選擇考慮因素 (續(xù) ) 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 052 產(chǎn)品選擇的考慮因素 ?提供當(dāng)今你需要的功能和特性 ?能力和特性 ?容易安裝和集中化管理 ?提供網(wǎng)絡(luò)的彈性 ?對(duì)現(xiàn)有基礎(chǔ)設(shè)備的投資保護(hù) ?提供系統(tǒng)的擴(kuò)展能力 ?為移動(dòng)用戶和分部提供無(wú)縫的連接訪問(wèn) 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 050 Hub Bridge Switch Router Collision Domains: 1 4 4 4 Broadcast Domains: 1 1 1 4 Network Device Domains 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 048 Synchronize Acknowledge, Synchronize Acknowledge Data Transfer (Send Segments) Sender Receiver Connection Established TCP面向連接協(xié)議的 “三次握手” 169。 差錯(cuò)檢測(cè)：使用幀校驗(yàn)和 FCS或者類似字段的包頭和包尾來(lái)檢測(cè)協(xié)議數(shù)據(jù)單元 PDU中的比特錯(cuò)誤，從而發(fā)現(xiàn)錯(cuò)誤，并丟棄該 PDU. 差錯(cuò)恢復(fù)：對(duì)因發(fā)現(xiàn)錯(cuò)誤而丟失的數(shù)據(jù)要作出響應(yīng)，并重傳送該數(shù)據(jù)。 可靠傳輸：傳輸過(guò)程具有差錯(cuò)檢測(cè)和恢復(fù)功能。 2023, Cisco Systems, Inc. All rights reserved. ICND — 047 幾個(gè)重要概念 面向連接的協(xié)議：該協(xié)議在開始傳輸數(shù)據(jù)之前需要在兩端點(diǎn)之間預(yù)先建立聯(lián)系。 2023, Cisco Systems, Inc. All rights reserved. ICND — 045 A與 E通信中數(shù)據(jù)幀與包的變化 Data Source address Destination address IP Header 第 3層 數(shù)據(jù)包邏輯源目的地址始終不變 Data L3a L3e IP Header Data Source add FCS Length Dest add Preamble 第 2層 數(shù)據(jù)幀 物理源目的地址不斷在改變 AB Data L2a FCS Length L2b1 Preamble BC Data L2b2 FCS Length L2c1 Preamble CD Data L2c2 FCS Length L2d1 Preamble DE Data L2d2 FCS Length L2e Preamble 169。 ? 使用配置信息確定網(wǎng)絡(luò)路徑 路由器中的路由表 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 042 路由過(guò)程 1. 從原計(jì)算機(jī)上將數(shù)據(jù)發(fā)送到某個(gè)鄰近路由器 2. 把數(shù)據(jù)從鄰近源計(jì)算機(jī)的路由器發(fā)送到鄰近目的計(jì)算機(jī)的路由器 3. 將數(shù)據(jù)從鄰近目的計(jì)算機(jī)的路由器發(fā)送到最終的目的計(jì)算機(jī) 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 040 路由器 :運(yùn)行在網(wǎng)絡(luò)層 ? 廣播控制 ? 多播控制 ? 優(yōu)化路徑的確定 ? 流量管理 ? 邏輯尋址 ? 連接到 WAN 169。 2023, Cisco Systems, Inc. All rights reserved. ICND — 038 Data Source address Destination address IP Header Node Network Logical Addr
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