Layers & Protocols

Layers & Protocols

1. OSI Model ( Open System Interface ) - 7 Layers
2. TCP / IP Model - 4 Layers

OSI MODEL :

1. Application Layer --------- Data
2. Presentation Layer ------- Data
3. Session Layer -------------Data
4. Transport Layer ----------Segments
5. Network Layer ----------- Packets ( Router – IP )
6. Data Link Layer ---------- Frames ( Switch & Bridge – MAC )
7. Physical Layer ------------ Dealing with Bits ( Repeater & Hub )

TCP / IP MODEL :

1. Application Layer
2. Transport Layer
3. Internet Layer
4. Network Access Layer

OSI LAYER : TCP / IP LAYER

Application Layer | Application Layer
Presentation Layer | Application Layer
Session Layer | Application Layer
Transport Layer - Transport Layer
Network Layer - Internet Layer
Data Link |Network Access Layer
Physical Layer | Network Access Layer

PROTOCOLS :

Physical & Data link Layer – Ethernet, Token Ring and FDDI

Network & Internet Layer - IP,ICMP,ARP,RARP,PPP,HDLC,SLIP

Transport Layer - TCP and UDP

Application Layer - FTP,TFTP,DNS,PROXY,SNMP,SMTP,TELNET,POP3
HTTP,REMOTE LOGIN



TCP ------------ Transmission Control Protocol
UDP------------ User Datagram Protocol
PPP-------------Point-to-Point Protocol
HDLC-----------High Level Data Link Protocol
SLIP------------Serial Line Internet Protocol
RIP-------------Routing Information Protocol
IGRP-----------Interior Gateway Routing Protocol
EIGRP----------Enhanced IGRP
BGP------------Border Gateway protocol
OSPF-----------Open Shortest Path First
IS-IS-----------Intermediate System - Intermediate System
IP--------------Internet Protocol
ICMP----------Internet Control Messaging Protocol
ARP-----------Address Resolution Protocol
RARP----------Reverse Address Resolution Protocol
FTP------------File Transfer Protocol
TFTP----------Trivial File Transfer Protocol
SNMP---------Simple Network Management Protocol
SMTP---------Simple Mail Transfer Protocol