Chapter 11: Networking with TCP/IP and the Internet

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Chapter 11:

Networking with TCP/IP and the Internet

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

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


Designing TCP/IP
-
Based
Networks


Subnetting


Enhance security


Improve performance


Simplify troubleshooting


Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Classful Addressing

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Subnet Masks

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Reserved Addresses

Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Subnetting Techniques

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Calculating Subnets

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Classless Inter
-
Domain Routing (CIDR)


Classless routing or supernetting


Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)

Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Internet Gateways

Designing TCP/IP
-
Based
Networks (continued)

This host will not get outside its
network, Why? Assume a /24 mask.

Designing TCP/IP
-
Based
Networks (continued)


Subnetting


Network Address Translation (NAT)

Designing TCP/IP
-
Based
Networks (continued)

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

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


TCP/IP Mail Services


MIME (Multipurpose Internet Mail
Extensions)


Allows for messages that contain no more than
1000 ASCII characters


TCP/IP Mail Services
(continued)


Post Office Protocol (POP)


Application layer protocol used to retrieve
messages from a mail server



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

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

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)


Additional TCP/IP Utilities
(continued)

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

Additional TCP/IP Utilities
(continued)


Nslookup


Allows you to query the DNS database


Additional TCP/IP Utilities
(continued)

Additional TCP/IP Utilities
(continued)


Whois


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

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

Additional TCP/IP Utilities
(continued)

Additional TCP/IP Utilities
(continued)


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)

Additional TCP/IP Utilities
(continued)

Additional TCP/IP Utilities
(continued)


Winipcfg


Windows 9x and Me operating systems

Additional TCP/IP Utilities
(continued)

Additional TCP/IP Utilities
(continued)


Ifconfig


-
a


down


up

Additional TCP/IP Utilities
(continued)

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


Voice Over IP (VOIP)
(continued)

Voice Over IP (VOIP)
(continued)

Voice Over IP (VOIP)
(continued)

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

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