CCNA Study Guide Logo

Tuesday, August 17, 2010

1.3 OSI and TCP/IP Model

The Open Systems Interconnection model (OSI model) defined by Open Systems Interconnection, while the Transmission Control Protocol/Internet Protocol (TCP/IP) model was created by Departement of Defense (DoD).

Lets take a look at OSI 7 layer model and comparison to TCP/IP model.

Table 1 – OSI Model Summary
Function Description
Sample Protocols/Technologies
7. Application Interfacing between communications software and any applications that need to communicate outside the computer. It also define proccess for user authentication.
6. Presentation Data representation (define and negotiate data formats),encryption and decryption.
SSL, Shells and Redirectors, MIME
5. Session Interhost communication. How to start, control, and end conversations (called session). An application can be notified if some of series of messages are completed. Allow presentation layer to have view of an incoming stream of data.
NetBIOS, Sockets, RPC
4. Transport End-to-end connections and reliability,error recovery, and Flow control
3. Network Three main feature : logical addressing, routing (forwarding), and path determination. IP Address, routing protocols, and routing table belong to this layer
IPv4, IPv6, IP NAT, IPsec, ICMP, IPX, Routing protocols
2. Data Link Defines how data is formatted for transmission and how access to the network is controlled. This layer has been divided by the IEEE 802 standards committee into two sublayers: media access control (MAC) and logical link control (LLC).
IEEE 802.2 LLC, Ethernet Family; Token Ring; FDDI, IEEE 802.11 (WLAN, Wi-Fi),ATM, SLIP and PPP
1. Physical Media, signal and binary transmission. Refer to standard of physical characterstics of transmission medium such as connector, pins, use of pins, electrical currents, encoding, light modulation, and other rules about physical medium
Physical layers technologies (RS-232, Full duplex, RJ45, V.35,T1, E1, 10BASE-T, 100BASE-TX, POTS, SONET, SDH, DSL, 802.11a/b/g/n, etc

Table 2 will show you comparison of OSI model and TCP/IP model, also encapsulation at each layers.

Table 2 - OSI vs TCP/IP Model, and encapsulation at each layers
OSI Layer
TCP/IP Layer
Encapsulation Units
Encapsulation Proccess
7. Application 4. Application Data Data
6. Presentation Data Data
5. Session Data Data
4. Transport 3. Transport Segments TCP/UDP HeaderData
3. Network 2. Internet Packets IP HeaderTCP/UDP HeaderData
2. Data Link 1. Network Access Frames MAC HeaderIP HeaderTCP/UDP HeaderDataCRC
1. Physical Bits Transmit into Physical Media (Bit Format)

Talking about encapsulation, bits transmitted from sender over physical media, at the receiving device will de-encapsulated from bits into frames, and so on untill arrived at Application layer.

Please find Sample CCNA exam (OSI and TCP/IP Model) to check if you already understand this material.

Related Posts by Categories


Cub Training said...

It was very nice article and it is very useful to
CCNA learners.We also provide CCNA online training

Daniel Joseph said...

SAP by definition is also name of the ERP (Enterprise Resource Planing) software as well the name of the company. SAP system comprises of a number of fully integrated modules, which covers virtually every aspect of the business management.
Success factor training in chennai | sap training in chennai | sap training in chennai | Workday training in chennai

rebeka christy said...

Your blog is really useful for me, and I gathered some information from this blog. I did SAP Training in Chennai, at FITA Academy. It's really useful for me to make a bright career in IT industry.

albertrou704 said...

Good one!!!
Buy Lorna Vanderhaeghe Estrosmart
cheap vitamins online canada
online vitamin store canada
shop vitamins online
vega one canada
lorna vanderhaeghe estrosmart
estrosmart canada
vega sport protein canada

Vinoth Kumar said...

Welcome to Wiztech Automation - Embedded System Training in Chennai. We have knowledgeable Team for Embedded Courses handling and we also are after Job Placements offer provide once your Successful Completion of Course. We are Providing on Microcontrollers such as 8051, PIC, AVR, ARM7, ARM9, ARM11 and RTOS. Free Accommodation, Individual Focus, Best Lab facilities, 100% Practical Training and Job opportunities.

Embedded System Training in chennai
Embedded System Training Institute in chennai
Embedded Training in chennai
Embedded Course in chennai
Best Embedded System Training in chennai
Best Embedded System Training Institute in chennai
Best Embedded System Training Institutes in chennai
Embedded Training Institute in chennai
Embedded System Course in chennai
Best Embedded System Training in chennai

Vinoth Kumar said...

PLC Training in Chennai
PLC Training Institute in Chennai
PLC Training Center in Chennai
PLC Training Course in Chennai
PLC Course in Chennai
PLC SCADA Training in Chennai
PLC Training Centre in Chennai
PLC SCADA Training Institute in Chennai
Best PLC Training in Chennai
Best PLC Training Institute in Chennai
DCS Training in Chennai
Automation Training in Chennai
Automation Training Institute in Chennai
Industrial Automation Training in Chennai
Process Automation Training in Chennai
Embedded Training in Chennai
VLSI Training in Chennai
Robotics Training in Chennai
Inplant Training in Chennai
AutoCad Training in Chennai
Web Designing Training in chennai

Ridhima said...

All are saying the same thing repeatedly, but in your blog I had a chance to get some useful and unique information, I love your writing style very much, I would like to suggest your blog in my dude circle, so keep on updates.

Java training in Adyar

Post a Comment

© Copyright 2010. CCNA Study Guide. All rights reserved | CCNA Study Guide is proudly powered by | Template by
Edited by CCNA Study Guide August 2010.