Networking Concepts Lesson 05 - OSI - Eric Vanderburg

  • 77 views
Uploaded on

Networking Concepts Lesson 05 - OSI - Eric Vanderburg

Networking Concepts Lesson 05 - OSI - Eric Vanderburg

More in: Technology
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
77
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
15
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 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