CCNA - Capitulo 6.1

CCNA - Capitulo 6.1

1. NETWORK ACCESS LAYER

   • ACCESS METHOD - MULTIACESS
     • 1 - CONTAINMENT BASED
       • CARRIER SENSE MULTIPLE ACCESS WITH COLLISION DETECTION (CSMA / CD )
         • LEGACY BUS-TOPOLOGY
         • AVOID COLISION
         • LEGACY ETHERNET HUB
         • WHATS IS COLISION ?
           • THIS OCCURS WHEN TWO DEVICES ATTEMPT TO TRANSMIT AT THE SAME TIME.
       • CARRIER SENSE MULTIPLE ACCESS WITH COLLISION AVOIDANCE (CSMA/CA )
         • WIRELESS LANs
           • EACH DEVICE THAT TRANSMITS INCLUDES THE TIME DURANT THAT IS NEED FOR THE TRANSMITION
         • NOT DETECT COLLISIONS BUT ATTEMPTS TO AVOID
       • ALL IN HALF DUPLEX
     • 2 - CONTROLLED ACCESS
       • TOKEN RING
       • EACH NODE HAS ITS OWN TIME TO USE THE MEDIUM
     • ALL NETWORK DEVICES MUST LISTEN BEFORE TRANSMITTING.
     • NOTE : NETWORKS WITH SWITCHES OPERATE IN FULL DUPLEX MODE AND DO NOT REQUIRE AN ACCESS METHOD.
     • NOT SCABLE WELL WELL UNDER HEAVY MEDIA USE

2. TOPOLOGIES

   • PHYSICAL TOPOLOGY
     • DEVICE LOCATION
       • ROOM NUMBER
       • EQUIPAMENT RACK
     • POINT TO POINT OR STAR
   • LOGICAL TOPOLOGY
     • VIRTUAL CONNECTIONS AND LAYER 3 IP
     • NETWORK TRANSFERS FRAMER FROM ONE NODE TO THE NEXT
   • WAN TOPOLOGIES
     • POINT TO POINT
       • PERMANENT LINK BETWEEN 2 ENDPOINT
       • PPP (SERIAL)
       • OBS
         • MAY BE INDIRECTLY CONNECTED TO EACH OVTHER OVER SOME GEOGRAPHICAL DISTANCE USING MULTIPLE INTERMEDIARY DEVICES
     • HUB AND SPOOK
       • VERSION
         • STAR TOPOLOGY
       • CENTRAL SITE - INTERCONNECTS
         • SITES THROUGH
       • BRANCH SITES
         • CANNOT EXCHANGE DATA WHITH OTHER BRANCH SITES
           • WITHOUT GOING THROUGH THE CENTRAL SITE
     • MESH
       • HIGH AVAILABILITY
       • PHYSICAL COSTS CAN BE SIGNIFICANT
     • PARTIAL MESH
       • IS A HYBRID TOPOLOGY IN WHICH SOME
         • BUT NOT ALL END DEVICES ARE INTERCONNECTED
   • LAN TOPOLOGIES
     • LEGACY LAN TOPOLOGIES
       • BUS
         • CSMD/CD
         • COAX CABLES
         • HUB
         • HALF DUPLEX
         • ALL END SYSTEMS ARE CHAINED TO EACH OTHER AND TERMINATED IN SOME FROM ON EACH END
         • SWITCH ARE NOT REQUIRED TO INTERCONNECT TO THE END DEVICES
       • RING
         • END SYSTEM ARE CONENCTED NEIGHBOR FORMING A RING
         • FSSI & TOKEN RING
     • STAR /EXTENDED STAR
       • END DEVICES CONNECT TO A CENTRAL INTERMEDIATE DEVICE
         • WHICH IN TURN CONNECTS TO OTHER CENTRAL INTERMEDIATE DEVICES.
       • HYBRID
         • HYBRID IS VARIATION OR COMBINATION OF ANY TOPOLOGIES

3. COMUNICATION DUPLEX

   • HAF DUPLEX
     • DEVICES CAN TRANSMIT AND RECEIVE ON THE MEDIA BUT
       • CANNOT DO SO SIMULTANEOUSLY.
     • ALLOWS ONLY ONE DEVICE TO SEND OR RECEIVE AT A TIME ON THE SHARED MEDIUM.
     • WLAN & LEGACY BUS , HUB
   • DUPLEX FULL
     • BOTH DEVICES CAN SIMULTANEOUSLY TRANSMIT AND RECEIVE ON THE SHARED MEDIA.
       • FULL DUPLEX NO ACCESS CONTROL REQUIRED
     • SWITCH OPERATE BY DEFAULT

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