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7 Layers of the OSI

Presentation of the OSI & TCP/IP Models for Indian Capital Technology Center Information Technology class. By the following students: Josh Campbell, Jerry McDonald, Marc Justice, Michael Thomas, Travis Northrup
by

Travis Northrup

on 14 October 2015

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Transcript of 7 Layers of the OSI

OSI Layer 1 - Physical
TCP/IP Layer 1 - Network
Transmission and Reception of the unstructured bit stream over the physical medium
EIA/TIA 232
V.24 & V.35
RJ45 & Wireless
BITS
OSI Layer 5 - Session
TCP/IP Layer 4-Application
Allows session establishment between processes running on different stations.
OSI Layer 6 - Presentation
TCP/IP Layer 4-Application
OSI Layer 2 - Data Link
TCP/IP Layer 1 - Network
Layer 2 OSI protocols specify the encapsulation of a packet into a frame and the technologies for getting the encapsulated packet on and off each medium.
802.2, 802.3, 802.5
PPP, HDLC
FDDI, ATM
Frame Relay
Frame
`
Forms the data to be presented to the Application layer, it can be viewed as the "Translator" for the network.
OSI Layer 7 - Application
TCP/IP Layer 4 - Application

OSI Layer 4 - Transport
TCP/IP Layer 3 - Host-To-Host
Messages are delivered error-free, and in order, and also with no losses or duplications.
Server at the window for users and applications processes to access the network services
Segments
TCP
UTP
SPX
HTTP
FTP
SMTP
SNMP
TELNET

Device:
Gateway

Gateway
DATA
trolol
NFS
Data
SQL
RPC
Xwindow
NetBIOS names
Data
PICT
TIFF
JPEG
MIDI
MPEG
QuickTime
GIF
ASCII
Logical Link Control
Defines the software processes that provide services to the network layer.
Media Access Control
Defines the media access processes performed by the hardware; providing addressing for data according the physical signaling.
SubLayers of the Data Link Layer
Layer 2 has been divided into multiple sublayers to help define seperate processes need to control the logical and physical media.
To Layer 3
To Layer 1
OSI Layer 3 - Network
TCP/IP Layer 2 - Internet
Controls the operations of the subnet, deciding which physical path the data takes
IP
IPX
AppleTalk
DDP
Packet
Troubleshooting 1-3 layers
Layer 1: Physical Troubleshooting
Layer 2: Data Link Troubleshooting
Layer 3: Network Troubleshooting
Troubleshooting 4-6 layers
Layer 4 troubleshooting for the transport is
Layer 5 troubleshooting for the session is
Layer 6 troubleshooting for the presentation is
Troubleshooting 7th layer
Layer 7: Application Troubleshooting
First make sure there are no access-lists or firewall’s blocking TCP/UPD ports. QoS (Quality of Service) can also affect the transport layer. QoS can block or slow traffic and also cause fragmentation of large frames. As such, if QoS is enabled, try disabling it while troubleshooting Layer 4 issues.
Checking the physical connections to equipment and media by hand, eye or using electronic testing equipment.
Running packet analyzers to check for defective frames and data.
Check switch configuration syntax.
Running network monitoring systems and packet analyzers.
Check router configuration syntax.
This layer can be troubleshot through various debuggers and logfile systems.
Refresh the page.
Make sure you have the correct programs installed.
Full transcript