CCNA 3 - Capitulo 13

CCNA 3 - Capitulo 13

1. CLOUD COMPUTING

   • BENEFITS CLOUD
     • ENABLES ACCESS TO ORGANIZATION ANYWHERE AND AT ANY TIME
     • ELIMINATES OR REDUCE COST WITH IT EQUIPMENT , MAINTENANCE AND MANAGEMENT
     • STREAMLINES OPERATIONS
       • SUBSCRIBING ONLY TO NEED SERVICES
     • RAPID RESPONSES INCREASING DATA VOLUME
     • PAY AS YOU GO
     • REDUCES COST WITH ENERGY , PHYSICAL PLANT REQUIREMENTS AND PERSONNEL TRAINING NEEDS
   • CLOULD SERVICES
     • SOFTWARE AS SERVICE (SaaS)
       • CLOUD PROVIDER IS RESPONSIBLE FOR ACCESS TO APPLICATION AND SERVICES AS SUCH
         • EMAIL , OFFICE 365
       • USER DOES NOT MANAGE ANY ASPECT OF THE CLOUD
     • PLATFORM AS A SERVICE (PaaS)
       • CLOUD PROVIDER IS RESPONSIBLE FOR DEVELOPMENT TOOLS AND SERVICES USED TO DELIVER THE APPLICATIONS
       • THERE USERS ARE TYPICALLY PROGRAMMERS
     • INFRASTRUCTURE AS SERVICE (IaaS)
       • CLOUD PROVIDER IS RESPONSIBLE FOR PROVIDING ACCESS NETWORK EQUIPMENT , VIRTUALIZED NETWORK AND SUPPORT NETWORK INFRAESTRUCTURE
         • EX : PERMITS DEPLOY AND RUN SOFTWARE CODE , INCLUDIND OPERATING SYSTEMS AND APPLICATIONS
     • WHATS IS ITaaS ?
       • CLOUD PROVIDERS PROVIDE IT SUPPORT EACH MODEL
   • CLOUD MODELS
     • PUBLIC CLOUDS
       • GENERAL POPULATION
       • FREE OR ARE PAY PER USE SUCH S PAYING FOR ONLINE STORAGE
       • USES THE INTERNET TO PROVIDE SERVICES
     • PRIVATE CLOUDS
       • SPECIFIC ORGANIZATION , ENTITY , GOVERNMENT
     • HYBRID CLOUDS
       • IS MADE UP OF TWO OR MORO CLOUDS
         • BOTH ARE CONNECTED USING A SINGLE ARCHITECTERURE
     • COMMUNITY CLOUDS
       • SPECIFIC COMMUNITY
         • EX HIPAA
     • DEFINED BY NIST IN THEIR 800-145
   • CLOUD
     • OFF PREMISE SERICE THAT OFFERS ON DEMAND ACCESS
       • SHARED POOL OF CONFIGURABLE COMPUTING RESOURCES
   • DATACENTER
     • DATA STORAGE AND PROCESSING FACILITY RUN BY AN IN HOUSE IT DEPARTMENT OR LEASED OFFISITE
     • PHYSICAL FACILITIES THAT PROVIDE THE COMPUTE , NETWORK AND STORAGE AND NEEDS OF CLOUD COMPUTING SERVICES

2. CLOUD COMPUTING AND VIRTUALIZATION

   • VIRTUALIZATION SEPARETES OS FROM THE HARDWARE
   • NETWORK VIRTUALIZATION
     • 2 - SERVER VIRTUALIZATION
       • ADVANTAGES OF VIRTUALIZATION
         • LESS EQUIPMENT IS REQUIRED
           • SERVER VIRTUALIZATION TAKES ADVANTAGE OF IDLE RESOURCES AND CONSOLDIATES THE NUMBER OF REQUIRED SERVERS
           • VIRTUALIZATION ENABLE CONSOLIDATION , BECAUSE IT REQUIRES FEWER PHYSICAL SERVERS
         • LESS ENERGY IS CONSUMED
           • WITH LESS PHYSICAL EQUIPMENT, ENERGY CONSUMPTION WILL BE LOWER.
         • LESS SPACE IS REQUIRED
           • VIRTUALIZATION REDUCES THE OVERALL FOOTPRINT OF THE DATA CENTER
         • EASIER PROTOTYPING
           • IF A MISTAKE IS MADE , AS ADMINISTRATOR CAN SIMPLY REVERT TO A PREVIUS VERSION
         • FASTER SERVER PROVISIONING
         • INCREASED SERVER UPTIME
           • VIRTUALIZATION PLATAFORMS OFFER ADVANCED REDUNDANT FAULT TOLERANCE FEATURES SUCH LIVE MIGRATION , STORAGE MIGRATING , HIGH VIRTUALIZATION
         • IMPROVED DISASTER RECOVERY
           • HARDWARE ABSTRACTION PROVIDES CAPABILITY THAT THE RECOVERY SITE NO LONGER NEED TO HAVE HARDWARE IDENTIFICAL TO THE HARDWAR PRODUCTION
         • REDUNDANCY FROM SINGLE POINT OF FAILURE CAN BE IMPLEMENTED IN DIFERENTE WAYS
           • 1 . IF THE HYPERVISOR FAILS, THE VM CAN BE RESTARTED ON ANOTHER HYPERVISOR
           • 2. THE SAME VM CAN RUN ON TWO HYPERVISORS CURRENTLY
         • LEGACY SUPPORT
         • FASTER SERVER PROVISIONING
           • IS FAR FASTER THAN PHYSICAL SERVER
       • MULTIPLE OS TO EXIST ON A SINGLE HARDWARE
       • WHAT IS A HYPERVISOR?
         • IS A PROGRAM , FIRMWARE OR HARDWARE THAT ADDS AN ABSTRACTION LAYER ON TOP THE PHYSICAL HARDWARE
         • ABSTRACTION LAYERS IS USED TO CREATE VM WHICH HAVE ACCESS TO ALL THE HARDWARE OF THE PHYSICAL MACHINE SUCH AS
           • MEMORY
           • CPUs
           • DISK CONTROLLERS
           • NICs
       • WHAT DOES A HYPERVISOR DO?
         • ADDS AN ABSTRACTION LAYER ON TOP OF THE PHYSICAL HARDWARE
         • CREATE VIRTUAL MACHINES WHICH HAVE ACCESS TO ALL THE HARDWARE
       • ABSTRACTION LAYERS
         • HELP EXPLAIN HOW VIRTUALIZATION WORKS , IT HELPS TO USE LAYERS OF ABSTRACTION IN COMPUTER ARCHICTURES
         • COMPUTER SYSTEM CONSIST ABSTRACTION LAYERS
           • SERVICES
           • OS
           • FIRMWARE
           • HARDWARE
           • EACH OF LAYERS OF ABSTRACTION , SOME TYPE OF PROGRAMMING CODE IS USED AS AN INTERFACE BETWEEN LAYER BELOW AND LAYER ABOVE
     • IS THE FOUDATION OF CLOUD
     • 1 - DEDICATED SERVERS
       • SINGLE POINT OF FAILURE
       • HISTORICALLY , ENTERPRISE SERVER SUCH WINDOWS SERVER OR LINUX SERVER INALLED ON SPECIFIC HARDWARE
       • THE MAJOR PROBLEM WITH THIS CONFIGURATION , IS
         • THAT WHEN A COMPONENT FAILS SERVER BECOMES UNAVAILABLE
         • WERE UNDERUSED . OFTEN SAT IDLE FOR LONG PERIODS OF TIME
   • VARIOUS PROVIDERS OFFER CLOUD VIRTUAL CLOUD THAT CAN DYANAMICALLY PROVISION SERVER AS REQUIRED
     • FOR EXAMPLE , AWS PROVIDE A SIMPLE WAY FOR CUSTOMERS PROVISION THE COMPUTE THEY NEED
   • VIRTUALIZATION IS THE FOUDATION OF CLOUD COMPUTING WITHOUT IT , CLOUD COMPUTING AS IT IS MOST WIDELY IMPLEMENTED , WOULD NOT BE POSSIBLE