Show pageOld revisionsBacklinksFold/unfold allBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== Network ====== ==== OSI Model ==== 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 | ==== MAC Addresses ==== Written in hexadecimal notation, composed of 12 digits, the first 6 correspond to the **O**rganizational **U**inque **I**dentifier (**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. ===== Fiber Optics ===== [[network:fiber-optics|Fiber Optics Section]] ===== Glossary ===== ***DOS :** **D**isk **O**perating **S**ystem *//The ancestor to Windows.// ***HAL :** **H**ardware **A**bsraction **L**ayer *//Used in virtualization technology.// ***MAC :** **M**edia **A**ccess **C**ontrol *//Unique identifier for any network device.// [[network:start#mac_addresses|See here.]] ***NAT :** **N**etwork **A**ddress **T**ranslation *//Allows the translation of multiple local private addresses into a single public IP. Used in most home routers.// [[https://www.comptia.org/content/guides/what-is-network-address-translation|More info]] ***NTFS :** **N**ew **T**echnology **F**ile **S**ystem *//A file system used by Windows.// ***OUI :** **O**rganizational **U**nique **I**dentifier *//First part of the MAC address used to identify the manufacturer.// ***SSID :** **S**ervice **S**et **Id**entifier *//Name used to identify it wireless networks from one another.// ***WAN :** **W**ide **A**rea **N**etwork *//Large network not tied to a single location but spread across several locations.// [[https://www.comptia.org/content/guides/what-is-a-wide-area-network|More info]] ===== Upcoming ===== *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 *Detail WAN/MAN/LAN *Detail NIC & MAC *Expand protocol / topology / deterministic *Compare hub vs switches *CSMA/CD *Ethernet Frame *Class of IP addresses *wired vs wireless (cite 3 advantages of each) network/start.txt Last modified: 2022/07/18 10:39by mh