network:start

This is an old revision of the document!


Network

The OSI (Open System Interconnect) Model was developed in 1984 as an open standard to promote network interconnection and interoperability.

Layer Function Examples
7. Application End User : Support for applications HTTP, FTP, SMTP (email)
6. Presentation Syntax : Protocol conversion, structures data for the application ASCII, JPEG, etc.
5. Session Sync & Ports : Establishes, manages and terminates sessions & connections NFS, SQL
4. Transport End to End Connection : Is concerned with message integrity between source and destination TCP, UDP
3. Network Packets : Combines messages into packets, adding routing information IP, IPX
2. Data Link Frames : Handles flow control, sequencing, errors MAC
1. Physical Cables : Provides electrical and mechanical connections to the network cables and NIC

Written in hexadecimal notation, composed of 12 digits, the first 6 correspond to the Organizational Uinque Identifier (OUI) and the last 6 are given by the manufacturer to each device. Every MAC address should be unique.

Large manufacturers may have many several OUI.

  • DOS : Disk Operating System
    • The ancestor to Windows.
  • HAL : Hardware Absraction Layer
    • Used in virtualization technology.
  • MAC : Media Access Control
    • Unique identifier for any network device. See here.
  • NAT : Network Address Translation
    • Allows the translation of multiple local private addresses into a single public IP. Used in most home routers. More info
  • NTFS : New Technology File System
    • A file system used by Windows.
  • OUI : Organizational Unique Identifier
    • First part of the MAC address used to identify the manufacturer.
  • SSID : Service Set Identifier
    • Name used to identify it wireless networks from one another.
  • Define kernels
  • Expand upond Topology (architectures)
  • List IANA somewhere (assigns IP addresses to the network and ensures their unicity)
  • Expand upon private IP addresses reserved (p. 50)
  • Talk about firewalls and Stateful Packet Inspection
  • network/start.1655814388.txt.gz
  • Last modified: 2022/06/21 14:26
  • by mh