OSI Layer Functions

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Author:
peeojay
ID:
259952
Filename:
OSI Layer Functions
Updated:
2016-03-23 08:06:27
Tags:
Layers
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Description:
OSI Reference Model Layers
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  1. Layer 7
    Application Layer
  2. Layer 6
    Presentation Layer
  3. Layer 5
    Session Layer
  4. Layer 4
    Transportation Layer
  5. Layer 3
    Network Layer
  6. Layer 2
    Data Link Layer
  7. Layer 1
    Physical Layer
  8. Describe FTP protocol.  What is its port type and number
    • File Transfer Protocol
    • TCP ports 20/21
  9. Describe SSH protocol. What is its port type and number
    • Secure Shell
    • TCP port22
  10. Describe SFTP protocol. What is its port type and number
    • Secure FTP
    • TCP port 22
  11. Describe SCP protocol. What is its port type and number
    • Secure CoPy
    • TCP port 22
  12. Describe Telnet protocol. What is its port type and number
    • Telnet (Telecommunications Network)
    • TCP 23
  13. Describe SMTP protocol. What is its port type and number
    • Simple Mail Transfer Protocol
    • TCP 25
  14. Describe DNS protocol.  What is its port type and number
    • Dynamic Name System (service)
    • TCP/UDP 53
  15. Describe TFTP protocol.  What is its port type and number
    • Trivial File Transfer Protocol
    • UDP 69
  16. Describe DHCP protocol.  What is its port type and number
    • Dynamic Host Configuration Protocol
    • UDP 67
  17. Describe HTTP protocol.  What is its port type and number
    • HyperText Transfer Protocol
    • TCP 80
  18. Describe POP3 protocol.  What is its port type and number
    • Post Office Protocol version 3
    • TCP 110
  19. Describe NNTP protocol.  What is its port type and number
    • Newark News Transport Protocol
    • TCP 119
  20. Describe NTP protocol.  What is its port type and number
    • Network Time Protocol
    • Support time sync among network devices.
    • UDP 123
  21. Describe SNTP protocol.  What is its port type and number
    • Simple Network Time Protocol
    • Support time sync among network devices.  Similar to NTP but simpler algorithms.
    • UDP 125
  22. Describe IMAP4 protocol. What is its port type and number
    • Internet Message Access Protocol version 4
    • Retrieves email from email server
    • TCP 143
  23. Describe LDAP protocol.  What is its port type and number
    • Lightweight Directory Access Protocol
    • Provides directory services to network clients
    • (ie username, password, email and phone number information)
    • TCP 389
  24. Describe HTTPS protocol.  What is its port type and number
    • HyperText Transfer Protocol Secure
    • TCP 443
  25. Describe RSH protocol.  What is its port type and number
    • Remote Shell
    • TCP 514
  26. Describe RTSP protocol.  What is its port type and number
    • Real Time Streaming Protocol
    • Communicates with a media server
    • TCP/UDP 554
  27. Describe RDP protocol.  What is its port type and number
    • Remote Desktop Protocol
    • Microsoft Protocol
    • TCP 3389
  28. Describe SNMP protocol.  What is its port type and number
    • Simple Network Management Protocol
    • Used to monitor and manage network devices
    • UDP 161
  29. Describe SNMP Trap protocol.  What is its port type and number
    • Simple Network Management Protocol Trap
    • Used to send notifications from SNMP agent to SNMP manager.
    • TCP/UDP 162
  30. Explain synchronizing bits and the common method types
    Communication at the physical layer between networks agreement on when bits start and stop. 

    The two common methods are synchronous and asynchronous
  31. Explain asynchronous synchronizing bits
    • The sender indicates it is about to send data by sending a start bit, which starts the receivers internal clock when received.  When the sender completes its transmission it sends a stop bit
    • which indicates transmission is complete.

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