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Making Networks Work - OSI Reference Model and Networking Concepts
1.
Chapter 5 Making Networks
Work Networking Concepts – Eric Vanderburg ©2005
2.
OSI Reference Model Application Application Presentation Presentation Session Session Transport Transport Network Network Datalink Datalink Physical Medium Networking
Concepts – Eric Vanderburg ©2005 Physical
3.
OSI Reference Model How
to remember this Please Do Not Throw Sausage Pizza Away Think of your own… 3 Sections of the Model Application Transport Application Layer (7) Presentation Layer (6) Session Layer (5) Transport Layer (4) Network Network Layer (3) Datalink Layer (2) Physical Layer (1) Networking Concepts – Eric Vanderburg ©2005
4.
Encapsulation Enclosing some data
within another thing so that the included data is not apparent. Networking Concepts – Eric Vanderburg ©2005
5.
Application – Layer
7 Where programs access network services FTP, HTTP, Client Software Problems at this layer: Misconfigured settings Incompatible commands Networking Concepts – Eric Vanderburg ©2005
6.
Presentation – Layer
6 Formats data Protocol conversion Encryption Compression Character set (ASCII, Unicode, EBCDIC) Problems at this layer: Cannot decrypt Wrong conversion Networking Concepts – Eric Vanderburg ©2005
7.
Redirector Sends requests for
services to the appropriate network device. RDR can sometimes stand for redirector Rdr.sys Windows redirector registry entries stored in HKEY_LOCAL_MACHINESYSTEMCurrentCon trolSetServices LanmanWorkstationParameters and HKEY_LOCAL_MACHINESYSTEMCurrentCon trolSetServicesRdr Networking Concepts – Eric Vanderburg ©2005
8.
Session – Layer
5 Manages communication Identification Window size Keep alive messages ACK, NAK Name resolution DNS NetBIOS Logon Problems at this level: Incorrect or no name resolution Networking Concepts – Eric Vanderburg ©2005
9.
Transport – Layer
4 Segmenting Sequencing Error checking Flow control – as much data as can handle TCP & SPX Problems at this layer: Overly large segments Networking Concepts – Eric Vanderburg ©2005
10.
Network – Layer
3 Logical addressing Routing QOS Deals with packets IP & IPX Problems at this layer: Incorrect routing (bad config) Incorrect routing table Incorrect routing protocol Incorrect IP configuration Networking Concepts – Eric Vanderburg ©2005
11.
Datalink – Layer
2 Physical Addressing Deals with frames Discards bad frames Convert to bits Problems at this layer: Collisions Bad frames Faulty NIC Incorrect bridging tables Networking Concepts – Eric Vanderburg ©2005
12.
Datalink Sublayers MAC
Manages multiple NICs Creates frame and sends to physical Sense carrier Pass tokens LLC Error recovery Integrity checking Networking Concepts – Eric Vanderburg ©2005
13.
Physical – Layer
1 Encoding - Convert bits to signals 101001011001 Problems at this level: Interference Noise Cable not connected Networking Concepts – Eric Vanderburg ©2005
14.
OSI & TCP/IP OSI
Model Application Presentation Session Transport Network Datalink Physical Networking Concepts – Eric Vanderburg ©2005 TCP/IP Application Transport Internet Network
15.
802 Specifications 802.1 Bridging
and Internetworks 802.2 Flow control LLC Sublayer 802.3 Ethernet 802.4 Token Bus 802.5 Token Ring 802.6 MAN 802.7 Broadband 802.8 Fiber Optics 802.9 VOIP 802.10 Security 802.11 Wireless 802.15 WPAN 802.18 Radio Wireless Networking Concepts – Eric Vanderburg ©2005
16.
Terms Congestion Control –
adjusts network transmissions based on current utilization Flow control – send as much data as each computer can handle at a time PDU – Packet Data Unit, Payload Data Unit, Protocol Data Unit Networking Concepts – Eric Vanderburg ©2005
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