CCNA - Capitulo 14.2

CCNA - Capitulo 14.2

1. TRANSPORT LAYER

   • PORT NUMBERs GROUPS
     • APPLICATION IDENTIFY
     • INTERNET ASSIGNED NUMBER AUTHORITY ( IANA )
       • RANGE 0 a 65535
       • STANDARD ORGANIZATION
         • ASSIGNING VARIOUS ADDRESSING , INCLUDIND THE 16 bits PORT NUMBERS
     • WELL KNOWN
       • 0 A 1023
       • COMMOM POPULAR SERVICES AND APPLICATIONS
         • WEB BROWSERS
         • EMAIL CLIENTS
       • DNS
         • NOTE IMPORTANT
           • COMMUNICATION BETWEEN TWO DNS SERVERS
             • TCP
           • CLIENT SEND REQUESTS TO A DNS SERVER
             • UDP
       • SERVER
     • REGISTRED
       • SPECIFIC PROCESSES OR APPLICATIONS
       • IANA
         • 1024 A 49,151
       • PRIMARLLY INDIVIDUAL APPLICATIONS
         • EX : CISCO HAS REGISTERED PORT 1812 FOR ITS RADIUS SERVERS
         • USER HAS CHOSEN TO INSTALL
     • PRIVATE / DYNAMIC
       • CLIENT OS
         • ASSIGN PORT DYNAMICALLY WHEN
           • CONNECTION TO A SERVICE IS INITIATED
       • OPERTIONS SYSTEMS ASSIGN
         • 49,152 A 65,535
       • EPHEMERAL PORTS
         • IDENTIFY THE CLIENT APPLICATION DURING COMMUNICATION
       • OBS : OPERATIONS SYSTEMS MAY USE REGISTERED PORT INSTEAD OF DUNAMIC FOR ASSIGNING SOURCE PORTS
   • THE NETSTAT COMMAND
     • HELP UNEXPLAINED TCP CONNECTIONS
     • INDICATE SOMETHING OR SOMEONE IS CONNECTED
       • HOST LOCAL
     • LIST THE PROTOCOLS IN USE
       • LOCAL ADDRESS , PORT NUMBERS , FOREIGN ADDRESS
       • CONNECTION STATE
     • BY DEFAULT WILL ATEMPTE TO RESOLVE IP ADDRESS TO DIMAIN NAME
       • THE -n OPRTIONS
         • DISPLAY IP ADDRESS AND PORT NUMBER IN THEIR NUMERICAL FORM
   • MULTIPLE SEPARATE COMMUNICATIONS
     • SOCKET PAIRS
       • ENABLED MULTIPLE PROCESSES RUNNING ON A CLIENT
         • DISTINGUISH THEMSELVES FROM ACH OTHER
         • MULTIPLE CONNECTIONS
       • IDENTIFY THE SERVER AND SERVICE REQUESTED BY THE CLIENT
       • EX > 10.12.0.149:8080
     • THE SEGMENT ARE ENCAPSULATED
       • IP PACKET

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