Your SlideShare is downloading. ×
0
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Internet Overview
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Internet Overview

447

Published on

Published in: Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
447
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
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. Introduction to the Internet May 18, 2000 Sandy Bacik, CISSP Senior Security Consultant Breakwater Security Associates email: san04@att.net
    • 2. Agenda <ul><li>History </li></ul><ul><li>Definitions </li></ul><ul><li>IP addresses and classes </li></ul><ul><li>Protocols </li></ul><ul><li>Tracking information </li></ul>
    • 3. History <ul><li>Sometimes call “the Net” </li></ul><ul><li>U.S. Defense Department - ARPAnet </li></ul><ul><li>A system of linked computer networks, international in scope, that facilitates data communication services </li></ul>
    • 4. Definitions Internet backbone This superfast network spanning the world from one major metropolitan area to another is provided by a handful of national Internet service providers (ISPs). Local ISPs connect to this backbone through routers so that data can be carried though the backbone to its destination.
    • 5. Definitions Internet Network Information Center A repository of information about the Internet. It is divided into two parts: 1) directory services, run by AT&T in New Jersey, and 2) registration services, run by Network Solutions in Virginia.
    • 6. Definitions IP (Internet Protocol) address <ul><li>A numeric address that is given to servers and users connected to the Internet. </li></ul><ul><li>For servers it is translated into a domain name by a Domain Name Server aka the DNS. </li></ul>
    • 7. Definitions TCP/IP <ul><li>Transmission Control Protocol/Internet Protocol </li></ul><ul><li>A suite of protocols </li></ul><ul><li>A 2 layer program </li></ul>
    • 8. Definitions Protocol An agreed upon formatting for transmitting data between two devices IP Internet Protocol. IP specifies the format of packets, also called datagrams, and the addressing scheme
    • 9. Definitions TCP Transmission control protocol enables 2 hosts to establish a connection and exchange streams of data. UDP User Datagram Protocol, a connectionless protocol that, like TCP, runs on top of IP networks.
    • 10. IP Addresses 192 . 168 . 124 . 123 An identifier for a computer or device on a TCP/IP network.
    • 11. Definitions DNS Domain Name Service WINS Windows Internet Naming Service DHCP Dynamic Host Configuration Protocol
    • 12. Port Number <ul><li>The port numbers are divided into three ranges: </li></ul><ul><ul><li>the Well Known Ports </li></ul></ul><ul><ul><li>the Registered Ports </li></ul></ul><ul><ul><li>the Dynamic and/or Private Ports </li></ul></ul><ul><li>ftp://ftp.isi.edu/in-notes/iana/assignments/port-numbers </li></ul>
    • 13. Protocols with Well-Known Ports <ul><li>telnet </li></ul><ul><li>news </li></ul><ul><li>echo </li></ul><ul><li>ping </li></ul><ul><li>chat </li></ul><ul><li>irc </li></ul><ul><li>http </li></ul><ul><li>smtp </li></ul><ul><li>pop3 </li></ul><ul><li>imap </li></ul><ul><li>netbios </li></ul><ul><li>ftp </li></ul><ul><li>print </li></ul>
    • 14. Protocols with Registered Ports <ul><li>Network blackjack </li></ul><ul><li>Tripwire </li></ul><ul><li>HP WebAdmin </li></ul><ul><li>Lotus Notes </li></ul><ul><li>screen cast </li></ul><ul><li>timbuktu </li></ul><ul><li>MS SQL </li></ul><ul><li>IBM wireless LAN </li></ul><ul><li>Shiva </li></ul><ul><li>laplink </li></ul><ul><li>prodigy internet </li></ul>
    • 15. TCP Session Setup Session setup using 3-way handshake
    • 16. TCP Session Termination Aborting a connection (reset)
    • 17. Reference Model
    • 18. TCP/IP related to OSI stack
    • 19. IPX/SPX related to OSI stack
    • 20. NetBEUI related to OSI stack
    • 21. UDP Packet Header information <ul><li>Source Port </li></ul><ul><li>Destination Port </li></ul><ul><li>Datagram Length </li></ul><ul><li>Checksum </li></ul>
    • 22. TCP Packet Header information <ul><li>Source Port </li></ul><ul><li>Destination Port </li></ul><ul><li>Sequence Number </li></ul><ul><li>Acknowledgement Number </li></ul><ul><li>Header Length </li></ul><ul><li>Flags </li></ul><ul><li>Window Advertisement </li></ul><ul><li>Checksum </li></ul><ul><li>Urgent Pointer </li></ul>
    • 23. Ping <ul><li>Information gathering </li></ul><ul><li>Selected hosts </li></ul><ul><li>See if hosts are alive and responding on a network </li></ul>
    • 24. Ping Sample
    • 25. Port Scanning <ul><li>Information gathering </li></ul><ul><li>Can be custom built or 3rd party software </li></ul><ul><li>Selected hosts </li></ul><ul><li>Ports are tested </li></ul>
    • 26. Traceroute <ul><li>Utility to record the route to a specific computer </li></ul><ul><li>Information gathering </li></ul><ul><li>Usually 3rd party software </li></ul><ul><li>UDP protocol using ports 33000 > < 35000 </li></ul>
    • 27. Traceroute Sample
    • 28. Thank you

    ×