Please enable JavaScript.

Coggle requires JavaScript to display documents.

Day 1 - Network , Cables, OSI and TCP models - Coggle Diagram

- - - - Has the correct protocol been applied to the interface so it agrees with the other side, such as Ethernet/PPP/HDLC, etc.?
    - - Is the interface using the correct IP address and subnet mask?
    - - Are all the cables inserted into the ports correctly, or have they come loose?
      - Has somebody forgotten to add the correct speed to the interface?
      - Has the speed of the Ethernet port been set correctly?
      - Has the interface been opened for use by the network administrator?
    - - Experts may argue that some Layer 4 issues are at Layer 3, some Layer 2 issues are actually at Layer 1, and so on
  - - - The Application Layer determines resource availability
    - - Encryption, decryption, and data compression also take place at this layer.
    - - The role of the Session Layer is to set up, manage, and terminate sessions or dialogues
        between devices
    - - flow control
      - windowing
      - acknowledgements
    - - Routers use logical addressing here, and TCP/IP addressing is called IP addressing
    - - WAN protocols workat Layer 2, including HDLC, ISDN, and PPP. Ethernet also works at Layer 2
    - - which are read as "on" and "off"
      - binary 0 and 1
  - - - application [telnet/FTP/DNS/RIP
      - Transport/ Host to host [UDP/TCP/ICMP]
      - Internet or internetwork [IPSec/IP]
      - Link/Network interface [frame relay/ ethernet/ ATM
    - - Application [Telnet/FTP/DNS/RIP/HTTP]
      - Transport /Host to host [UDP/TCP/ICMP]
      - Network [IPSec/IP]
      - Data link [ethernet/ frame relay/ppp]
      - Link/Network interface/physical
- - - - . - One period for each timeout
      - U - Destination unreachable message
      - N - Network unreachable message
      - P - Protocol unreachable message
      - ! - One exclamation mark per response
      - Q - Source quench message
      - M - Could not fragment
      - ? - Unknown packet type
  - - - the IP (or Layer 3) address
      - the local (or Data Link Layer) address