1. Chapter 11: Networking with TCP/IP and the Internet

2. Objectives Discuss methods of network design unique to TCP/IP networks, including subnetting, CIDR, and NAT Describe protocols used between mail clients and mail servers

3. Objectives (continued) Explain the fundamental principles of using a TCP/IP network for packetized voice transmissions Employ multiple TCP/IP utilities for network discovery and troubleshooting

4. Designing TCP/IP-Based Networks Subnetting Enhance security Improve performance Simplify troubleshooting

5. Designing TCP/IP-Based Networks (continued) Subnetting Classful Addressing

6. Designing TCP/IP-Based Networks (continued)

7. Subnetting Subnet Masks

8. Designing TCP/IP-Based Networks (continued)

11. Subnetting Reserved Addresses

12. Designing TCP/IP-Based Networks (continued) Subnetting Subnetting Techniques

13. Designing TCP/IP-Based Networks (continued)

15. Subnetting Calculating Subnets

16. Designing TCP/IP-Based Networks (continued)

17. Subnetting Classless Inter-Domain Routing (CIDR) Classless routing or supernetting

18. Designing TCP/IP-Based Networks (continued)

21. Subnetting Internet Gateways

22. Designing TCP/IP-Based Networks (continued) This host will not get outside its network, Why? Assume a /24 mask.

23. Designing TCP/IP-Based Networks (continued) Subnetting Network Address Translation (NAT)

24. Designing TCP/IP-Based Networks (continued)

25. Subnetting Intranets and Extranets Hypertext Markup Language (HTML) Intranet Within an enterprise Extranet Uses Internet-like services and protocols

26. Designing TCP/IP-Based Networks (continued) Simple Mail Transfer Protocol (SMTP) Protocol responsible for moving messages from one mail server to another over TCP/IP-based networks

27. TCP/IP Mail Services MIME (Multipurpose Internet Mail Extensions) Allows for messages that contain no more than 1000 ASCII characters

28. TCP/IP Mail Services (continued) Post Office Protocol (POP) Application layer protocol used to retrieve messages from a mail server

29. TCP/IP Mail Services (continued) Internet Mail Access Protocol (IMAP) Retrieve all or only a portion of any mail message Review their messages and delete them while the messages remain on the server Create sophisticated methods of organizing messages on the server Share a mailbox in a central location

30. Additional TCP/IP Utilities Netstat -a—Provides a list of all available TCP and UDP connections -e—Displays details about all the packets -n—Lists currently connected hosts according to their port and IP address

31. Additional TCP/IP Utilities (continued) Netstat (cont.) -p—Allows you to specify what type of protocol statistics to list Must be followed by a protocol specification (TCP or UDP) -r—Provides a list of routing table information -s—Provides statistics about each packet transmitted by a host, separated according to protocol type (IP,TCP, UDP, or ICMP)

32. Additional TCP/IP Utilities (continued)

33. Nbtstat -a—Displays a machine’s name table given its NetBIOS name -A—Displays a machine’s name table given its IP address -r—Lists statistics about names that have been resolved -s—Displays a list of all the current NetBIOS sessions

34. Additional TCP/IP Utilities (continued) Nslookup Allows you to query the DNS database

35. Additional TCP/IP Utilities (continued)

36. Whois Allows you to query this DNS registration database and obtain information about a domain

37. Additional TCP/IP Utilities (continued) Traceroute (Tracert) -d—Instructs the traceroute command not to resolve IP addresses to host names -h—Specifies the maximum number of hops -w—Identifies a timeout

38. Additional TCP/IP Utilities (continued)

39. Ipconfig /?—Displays a list of switches /all—Displays complete TCP/IP configuration /release—Releases DHCP /renew—Renews DHCP /displaydns---Displays DNS Cache /flushdns---Clears DNS Cache (not host file)

40. Additional TCP/IP Utilities (continued)

41. Winipcfg Windows 9x and Me operating systems

42. Additional TCP/IP Utilities (continued)

43. Ifconfig -a down up

44. Additional TCP/IP Utilities (continued)

45. Voice Over IP (VOIP) Voice over IP (VoIP), also known as IP telephony Lower costs for voice calls toll bypass Supply new or enhanced features and applications Centralize voice and data network management

46. Voice Over IP (VOIP) (continued)

49. Chapter Summary Discuss methods of network design unique to TCP/IP networks, including subnetting, CIDR, and NAT Describe protocols used between mail clients and mail servers

50. Chapter Summary (continued) Explain the fundamental principles of using a TCP/IP network for packetized voice transmissions Employ multiple TCP/IP utilities for network discovery and troubleshooting