CCNA 3 - Capitulo 11

CCNA 3 - Capitulo 11

1. NETWORK DESIGN

   • SCALABLE NETWORKS
     • DESIGN FOR SCALABILITY
       • NETWORK THAT CAN GROW LOSING
         • AVAILABILITY
         • REABILITY
       • FOLLOWING RECOMMENDATIOS
         • USE A EXPANSABLE , MODULAR EQUIPAMENT OR CLUSTERED DEVICES
           • EX : SOME DEVICES CAN BE INTEGRATED IN A CLUSTERS TO ACT AS ONE DEVICE TO SIMPLIFY MANAGEMENT AND CONFIGURATION
         • MODULES THAT CAN ADDED , UPGRADED , MODIFIED
         • CREATE ADDRESS STRATEGY THAT IS HIERARCHICAL
         • CHOOSE ROUTER AND SWITCHS L3 LIMIT FILTER BROADCASTS
         • DESIGN A HIERARCHICAL NETWORK WITH MODULAR COMPONENTS THAT CAN BE EASILY ADDED, UPGRADED, OR MODIFIED WHEN NEEDED.
           • EX : CREATING A SEPARETE ACCESS LAYER THAT CAN BE EXPANDED WITHO AFFECTING THE DISTRIBUITION AND CORES LAYERS
       • NETWORK DESIGNER MUST DEVELEOP A STRATEGY TO ENABLE NETWORK SCALE EFFECIVELY AND EASILY
       • ADVANCED NETWORK DESIGNS
         • IMPLEMENT REDUNDANT LINKS
           • REDUNDANT LINKS BETWEEN CRITICAL DEVICES AND BETWEEN ACCESS LAYER AND CORE LAYER DEVICES
         • SCALABLE ROUTING PROTOCOLS
           • ISOLATE ROUTING UPDATES
           • MINIMIZE THE SIZE OF THE ROUTING TABLE
         • WIRELESS CONNECTIVIRY
           • ALLOW MOBILITY AND EXPANSION
         • IMPLEMENT MULTIPLES LINKS
           • ETHERCHANNEL OR EQUAL COST LOAD BALANCING (ECMP) TO INCREASE LOAD BANDWIDTH
     • PLAN FOR REDUNDANCY
       • WHATS YOUR PURPOSE ?
         • MINIMIZING THE POSSIBILITY OF A SINGLE POINT FAILURE
       • FORMS OF REDUNDANCY
         • 1. REDUNDANT PATHS
         • 3. DUPLICATE EQUIPMENT
         • 2. FAILOVER SERVICES CRITICAL
         • 4. LAYER 3 IN BACKBONE
           • WITHOT THE NEED STP AT LAYER 2
     • REDUCE FAILURE DOMAIN SIZE
       • FAILURE DOMAIN ASSOCIATED DEVICES
         • CORE LAYER
           • POTENTIALLY LARGE IMPACT
           • NETWORK DESIGNER CONCENTRATES PEVENT FAILURES
         • DISTRIBUITION LAYER
           • SMALLER AREA
           • EASIEST AND USUALLY LEAST EXPENSIVE TO CONTROL THE SIZE OF FAILURE DOMAIN
         • ACCESS LAYER
           • DOES NOT AFFECT A SIGNIFICANT NUMBER OF END USERS
           • EXPAND THE ACCESS LAYER
             • NETWORK MUS BE DESIGNATED EXPANDE ACCESS TO INDIVIDUAL DEVICES AS NEED
             • WIRELESS CONNECTIVITY OFFERS MANY ADVANTAGES
               • INCREASED FLEXIBILITY
               • REDUCED COSTS
               • ABILITY TO GROW TO CHANGING NETWORK AND BUSINESS REQUIREMENTS
         • AP
       • WHATS IS ?
         • AREA OF A NETWORK THAT IS IMPACTED CRITICAL DEVICE
           • CRITICAL DEVICE
           • NETWORK EXPERIENCES PROBLEMS
       • ROUTERS OR MULTILAYER SWITCHES ARE DEPLOYED IN PAIRS
     • INCREASE BANDWIDTH
       • LINKS BETWEEN ACCESS AND DISTRIBUTION SWITCHES
         • HIGHER AMOUNT OF TRAFFIC
         • THAT LINK TO BECOME A BOTTLENECK
         • ETHERCHANNEL ALLOWS TO INCREASE THE AMOUNT OF BANDWIDTH BETWEEN DEVICES
           • ADDITIONAL COST TO UPGRADE THE LINK TO A FASTER AND MORE EXPENSIVE CONNECTION ARE NOT NECESSARY
     • TUNE ROUTING PROTOCOLS
       • OSPF IS WEAK SUITED FOR LARGER NETWORKS BECAUSE
         • IT CAN DEPLOYED USING A HIERARCHICAL DESIGN