CCNA - Capitulo 15

CCNA - Capitulo 15

1. LAYER APPLICATION

   • MODELO OSI
     • 3
       • 7-APPLICATION
         • END USER
         • INTERFACE BETWEEN THE APPLICATIONS
       • 6-PRESENTATION
         • THREE PRIMARY FUNCTIONS
           • FORMATING, OR PRESENTING DATA
           • COMPRESSING DATA
             • CAN BE DECOMPRESSED BY THE DESTINATION DEVICE
           • ENCRYPTING AND DECRYPTING DATA
         • STANDARD FILE FORMATS
           • MKV
           • MPG
           • GIF
           • GIF
           • JPG
           • PNG
       • 5-SESSION
         • CREATE AND MAINTAIN DIALOGS BETWEEN
           • SOURCE AND DESTINATION
   • MODELO TCP/IP
     • 1
       • LAYER APPLICATION
       • EXCHANGE DATA BETWEEN PROGRAMS RUNNING
   • TCP/IP APPLICATION LAYER PROTOCOLS
     • EMAIL
       • IMAP (INTERNET MESSAGE ACCES PROTOCOL )
         • TCP 143
         • MANTAINS EMAIL ON THE SERVER
         • 993 - SSL
         • ENABLE
           • CLIENTS TO ACCESS EMAIL STORED ON A MAIL SERVER
             • COPIES OF THE MESSAGES ARE DOWNLOADED TO THE CLIENT APPLICATION
             • THE ORIGINAL MESSAGE ARE KEPT ON THE SERVER
       • POP3 (POST OFFICE PROTOCOL )
         • TCP 110
         • 995 - SSL
         • ENABLE
           • CLIENT RETRIEVE EMAIL SERVER
           • DOWNLOAD THE EMAIL TO THE LOCAL OF THE CLIENT ;
             • DELETED / REMOVED ON THE SERVER.
         • ITS IS NOT RECOMMENDED
           • SMALL BUSINESS
           • BUSINESS THAT NEED A CENTRALIZED BACKUP
       • SMTP (SIMPLE MAIL TRANSFER PROTOCOL )
         • TCP 25
         • FORMATS REQUIRE A MESSAGE HEADER AND A MESSAGE BODY
         • ENABLE
           • CLIENT SO SEND EMAIL TO A MAIL SERVER
           • SERVER TO SEND EMAIL TO OTHER SERVERS
         • 587 - SSL
         • FORMAT MESSAGE REQUIRE
           • MESSAGE HEADER
           • MESSAGE BODY
         • SMTP SPOOLS MESSAGES TO BE SENT AT A LATER TIME
     • NAME SYSTEM
       • DNS
         • TCP OR UDP 53
         • TRANSLATE DOMAIN NAMES , SUCH CISCO INTO IP ADDRESS
     • HOST CONFIG
       • DHCP
         • CLIENT
           • 68
         • SERVER
           • 67
         • DYNAMICALLY ASSIGNS IP
       • BOOTP (BOOTSTRATP PROTOCOL)
         • SERVER
           • 67
         • CLIENT
           • 68
         • DISKLESS WORKSTATION
           • DISCOVER ITS OWN IP ADDRESS
         • IS BEING SUPERSDED BY DHCP
     • FILE TRANSFER
       • TFTP (TRIVIAL FILE TRANSFER PROTOCOL)
         • UDP
           • 69
         • A SIMPLE ; CONECTLESS
         • LESS OVERHEAD THAN FTP
         • UNACKNOWLEDGED
       • FTP (FILE TRANSFER PROTOCOL)
         • RULES
           • USER ON ONE HOST ACCESS
             • TRANSFER FILES ANOTHER HOST
         • CHARACTERISTICS
           • TCP 20
           • TCP 21
           • RELIABLE
           • CONENECTION ORIENTED
           • ACKNOWLEGED
     • WEB
       • HTTP - HYPERTEXT TRANSFER PROTOCOL
         • WEB BROWSER AND WEB SERVER INTERACT
           • STEP 1
             • BROWSER INTERPRETS TREE PARTS URL
               • HTTP
                 • PROTOCOL
               • WWW.GOOGLE.COM
                 • SERVER NAME
               • INDEX.HTML
                 • SPECIFIC FILENAME REQUESTED
           • STEP 2
             • BROWSER THEN CHECKS WITH A NAME SERVER TO CONVERT
               • WWW.CISCO.COM INTO NUMERIC IP
             • CLIENT INITIATES AN HTTP REQUEST TO A SERVER
               • SENDING GE TO THE SERVER AND ASKS FOR INDEX.HTML
           • STEP 3
             • IN RESPOST TO THE REQUEST
               • SERVER SENDS THE HTML CODE FOR THIS WEB PAGE
           • STEP 4
             • THE BROWSER DICIPHERS THE HTML CODE
               • FORMATS THE PAGE FOR THE BROSER WINDOW
         • TCP 80 , 8080
         • TREE COMMOM MESSAGE TYPES ARE
           • GET
             • DOWNLOAD
             • CLIENT REQUEST FOR DATE
               • WEB BROWSER SENDS THE GET TO THE WEB PAGE (HTML PAGES )
           • POST
             • UPLOADS
               • SUCH AS FORM DATA
           • PUT
             • UPLOADS RESOURCES OR CONTENT TO THE WEB SERVER
               • SUCH AS AN IMAGE
         • TEXT, GRAPHIC IMAGES, SOUND, VIDEO
         • A SET OF RULES FOR EXCHANGING
       • HTTPS - HTTP SECURE
         • TCP 443
         • BROWSER USES ENCRYPTION
           • SECURE HTTP COMMUNICATONS
         • AUTHENTICATES THE WEBSITE
           • YOU ARE CONNECTING YOUR BROWSER
   • CLOSEST LAYER USER END
   • FORMAT AND CONTROL INFORMATION NECESSARY

2. MODELO

   • CLIENT SERVER MODEL
     • CLIENT
       • DEVICE REQUESTING THE INFOMATION
     • SERVER
       • DEVICE RESPONDINING
   • PEER TO PEER MODEL
     • PEER-TO-PEER NETWORK ENVIRONMENT EVERY PEER CAN FUNCTION AS BOTH A CLIENT AND A SERVER.
     • WITHOUT THE USE DEDICATED SERVER
     • TWO PARTS
       • P2P NETWORKS
         • TWO OR MORE COMPUTERS ARE CONNECTED
           • THROUGH A NETWORK AND CAN SHARE RESOURCES
             • PRINTERS
             • FILES
         • EX :
           • BIT TORRENT
           • eDonkey
           • DIRECT CONNECT
           • FREENET
       • P2P APPLICATIONS
         • RESOURCE SHARING
           • IS DECENTRALIZED
         • COMMOM PROTOCOL
           • GNUTELLA
             • USERS CAN SHARE WHOLE FILES WITH OTHER USER
             • CLIENT APPLICATIONS
               • UTORRENT
               • BITCOMET
               • DC++
               • DELUGE
         • BOTH DEVICES ARE CONSIDERED EQUAL IN THE COMMUNICATION PROCESS.