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Basic Networking Guide
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Chapter 11: Networking with TCP/IP and the Internet
Network+ Guide to Networks
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)
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Designing TCP/IP-Based Networks (continued)
• Subnetting• Subnet Masks
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
• Subnetting• Reserved Addresses
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Designing TCP/IP-Based Networks (continued)
• Subnetting• Subnetting Techniques
13
Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
• Subnetting• Calculating Subnets
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
• Subnetting • Classless Inter-Domain Routing (CIDR)
• Classless routing or supernetting
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
• Subnetting • Internet Gateways
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Designing TCP/IP-Based Networks (continued)
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Designing TCP/IP-Based Networks (continued)
• Subnetting • Network Address Translation (NAT)
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Designing TCP/IP-Based Networks (continued)
25
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
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)
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Additional TCP/IP Utilities (continued)
33
Additional TCP/IP Utilities (continued)
• 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
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Additional TCP/IP Utilities (continued)
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Additional TCP/IP Utilities (continued)
• 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
Additional TCP/IP Utilities (continued)
• Ipconfig• /?—Displays a list of switches
• /all—Displays complete TCP/IP configuration
• /release—Releases DHCP
• /renew—Renews DHCP
40
Additional TCP/IP Utilities (continued)
41
Additional TCP/IP Utilities (continued)
• Winipcfg• Windows 9x and Me operating systems
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Additional TCP/IP Utilities (continued)
43
Additional TCP/IP Utilities (continued)
• 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)
47
Voice Over IP (VOIP) (continued)
48
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