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More informations #14

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More informations #14

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5 changes: 4 additions & 1 deletion topics/networking.md
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
Sr No | Layer | Data unit | Examples
------|-----------------|--------------------|-------------------------------------
1 | Physical | bit | Ethernet, USB, Wi-Fi, Bluetooth, DSL
2 | Data link | Frame | L2TP, PPP
2 | Data link | Frame | L2TP, PPP, CSMA/CD
3 | Network     | Packet             | **IPv4**, **IPv6**
4 | Transport | Segment (Datagram) | **TCP**, **UDP**
5 | Session | Data | HTTP, FTP, SMTP, DNS, IMAP, SSH, TLS
Expand All @@ -21,6 +21,7 @@ Sr No | Layer | Data unit | Examples
- Frame
- Structure: Frame header (e.g. Ethernet) + (Network header + Transport header + data) + Frame footer
- Source and destination MAC addresses, length, checksum
- Max Lenght of a frame: 1518 Byte, 12 Byte for mac addresses, 2 Byte for Ethertype and 4 Byte for FCS (Frame Check Sequence).
- Packet
- Structure: Network header (e.g. IP) + (Transport header + data)
- Version (IPv4/IPv6), source and destination IP addresses, length flags, TTL, protocol, checksum
Expand All @@ -36,6 +37,8 @@ Sr No | Layer | Data unit | Examples
- No delivery guarantee, no receiving ack.
- Sometimes multiple copies of the same packet are passes, taking different paths, and thus arriving at different times.
- Designed to be able to route around connectivity problems.
- Exists two version of this: IPv4 and IPv6, we are migrating to v4 to v6 because there are a lot of Internet Devices.
- The main difference is that IPv4 is only 32 bit and the IPv6 is 128 bit

## TCP

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