Lab 1_2_2

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26 Οκτ 2013 (πριν από 3 χρόνια και 5 μήνες)

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Lab 2.3.4 OSI Model and TCP/IP
-

Overview

Estimated time: 20 min.

Objectives:

This Lab will focus on your ability to accomplish the following tasks:



Describe the 4 layers of the TCP/IP model



Relate the seven layers of the OSI model to the 4 layers of the
TCP/IP model



Name the primary TCP/IP protocols and utilities that operate at each layer

Background:

This lab will help you develop a better understanding of the seven layers of the OSI model as
they relate to the most popular functioning networking model

in existence, the TCP/IP model. The
Internet is based on TCP/IP which has become the standard language of networking. Although
the TCP/IP model is the most widely used, the 7 layers of the OSI model are the ones most
commonly used to describe and compare
networking software and hardware from various
vendors. It is very important to know both the OSI and TCP/IP models and be able to relate (or
map) the layers of one to the other. An understanding of the TCP/IP model and the protocols and
utilities that oper
ate at each layer is essential when troubleshooting.

Tools / Preparation:

You may work individually or in teams. The following resources will be required:



PC workstation with Monitor, keyboard, mouse, and power cords



Windows operating system (Win 95, 98,
NT or 2000) installed on PC



NIC installed and Cat 5 patch cable with connection to the Internet



Browser software installed (Netscape Navigator 4.6.1 or higher or Internet Explorer 5.1 or
higher



Java, JavaScript, and Style Sheets (must be enabled in your

browser's preference
settings)



Flash plug
-
in (Curriculum version 2.1 only)



Apple QuickTime, RealPlayer G2 and ShockWave Macromedia browser plug
-
ins
(Curriculum version 1 and 2 only)



Sample Ethernet and Token Ring NICs with different connectors (Coax, A
UI, RJ
-
45)



Sample Hubs, Switches and Routers

Notes:




Step 1


The OSI model and associated TCP/IP prot
ocol stack layer.

Task:
Fill out the following charts based on your knowledge of the OSI model and TCP/IP
models.

Explanation:
Your understanding of the OSI model as it relates to the TCP/IP model will greatly
increase your ability to absorb and categorize

networking information as you learn it.

1. List the 7 layers of the OSI model from the top to the bottom with the proper name for each
layer. List the TCP/IP layer number and its correct name in the next columns. Also list the term
used for the encapsula
tion units, the related TCP/IP protocols / utilities and the devices that
operate at each layer. NOTE: More than one OSI layer will be related to certain TCP/IP layers.

OSI comparison with TCP/IP Protocol Stack

OSI #

OSI Layer
Name

TCP/IP #

TCP/I
P
Layer name

Encapsul.
Units

TCP/IP
Protocols At
each TCP/IP
layer

TCP Utilities

7







6







5







4







3







2







1







EXERCISE 2.3.4
-

OSI MODEL and TCP/IP
-

ANSWERS

Step 1
-

The OSI model and associated TCP/IP protocol stack lay
er.


Task:
Fill out the following chart based on your knowledge of the OSI and TCP/IP models.

Explanation:

Your understanding of the OSI model as it relates to the TCP/IP model will greatly increase
your ability to absorb and categorize networking informa
tion as you learn it.

1.

List the 7 layers of the OSI model from the top to the bottom with the proper name for each layer.
List the TCP/IP layer number and its correct name in the next columns. Also list the term used for
the encapsulation units, the related

TCP/IP protocols / utilities and the devices that operate at
each layer. NOTE: More than one OSI layer will be related to certain TCP/IP layers.

OSI comparison with TCP/IP Protocol Stack

OSI
#

OSI Layer
Name

TCP/
IP #

TCP/IP
Layer Name

Enca
psul.
Units

TCP/IP Protocols
At each TCP/IP
layer

TCP Utilities

7

Application

4

Application

Data

FTP, HTTP use
TCP as transport
SMTP, DNS, and
TFTP use UDP
as transport

Telnet,
Rlogin

6

Presentation

4

Application

Data



5

Session

4

App
lication

Data



4

Transport

3

Transport

Segments

TCP or UDP


3

Network

2

Internet

Packets
(datagrams)

IP, ICMP, ARP,
RARP

Ping,
Traceroute

2

Data Link (LLC
& MAC)

1

Network
(interface)

Frames



1

Physical

1

Network
(interface)

B
its