Network Guide to Networks Third Edition Chapter 11

Network+ Guide to Networks Third Edition Chapter 11: Networking with TCP/IP and the Internet

Objectives üDiscuss methods of network design unique to TCP/IP networks, including subnetting, CIDR, and NAT üDescribe protocols used between mail clients and mail servers Network + 2

Objectives (continued) üExplain the fundamental principles of using a TCP/IP network for packetized voice transmissions üEmploy multiple TCP/IP utilities for network discovery and troubleshooting Network + 3

Designing TCP/IP-Based Networks • Subnetting • Enhance security • Improve performance • Simplify troubleshooting Network + 4

Designing TCP/IP-Based Networks (continued) • Subnetting • Classful Addressing Network + 5

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Designing TCP/IP-Based Networks (continued) • Subnetting • Subnet Masks Network + 7

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Designing TCP/IP-Based Networks (continued) • Subnetting • Reserved Addresses Network + 11

Designing TCP/IP-Based Networks (continued) • Subnetting Techniques Network + 12

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Designing TCP/IP-Based Networks (continued) • Subnetting • Calculating Subnets Network + 15

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Designing TCP/IP-Based Networks (continued) • Subnetting • Classless Inter-Domain Routing (CIDR) • Classless routing or supernetting Network + 17

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Designing TCP/IP-Based Networks (continued) • Subnetting • Internet Gateways Network + 21

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

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Designing TCP/IP-Based Networks (continued) • Subnetting • Intranets and Extranets • Hypertext Markup Language (HTML) • Intranet • Within an enterprise • Extranet • Uses Internet-like services and protocols Network + 25

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 Network + 26

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

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

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 Network + 29

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 Network + 30

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) Network + 31

Additional TCP/IP Utilities (continued) Network + 32

Additional TCP/IP Utilities (continued) • Nbtstat • -a—Displays a machine’s name table given its • • • Net. BIOS 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 Net. BIOS sessions Network + 33

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

Additional TCP/IP Utilities (continued) Network + 35

Additional TCP/IP Utilities (continued) • Whois • Allows you to query this DNS registration database and obtain information about a domain Network + 36

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 Network + 37

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Additional TCP/IP Utilities (continued) • Ipconfig • /? —Displays a list of switches • /all—Displays complete TCP/IP configuration • /release—Releases DHCP • /renew—Renews DHCP Network + 39

Additional TCP/IP Utilities (continued) Network + 40

Additional TCP/IP Utilities (continued) • Winipcfg • Windows 9 x and Me operating systems Network + 41

Additional TCP/IP Utilities (continued) Network + 42

Additional TCP/IP Utilities (continued) • Ifconfig • -a • down • up Network + 43

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Voice Over IP (VOIP) • Voice over IP (Vo. IP), 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 Network + 45

Voice Over IP (VOIP) (continued) Network + 46

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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 Network + 49

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 Network + 50