Download Power Point Chapter 01 CCNA4

CCNA 4 v3.0 Module 1
Scaling IP Addresses
© 2003, Cisco Systems, Inc. All rights reserved.
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Purpose of This PowerPoint
• This PowerPoint primarily consists of the Target
Indicators (TIs) of this module in CCNA version
3.0.
• It was created to give instructors a PowerPoint to
take and modify as their own.
• This PowerPoint is:
NOT a study guide for the module final assessment.
NOT a study guide for the CCNA certification exam.
• Please report any mistakes you find in this
PowerPoint by using the Academy Connection
Help link.
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To Locate Instructional Resource
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• Go to the Community link under Resources
• See the resources available on the Class home
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• Search http://www.cisco.com
• Contact your parent academy!
© 2003, Cisco Systems, Inc. All rights reserved.
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Objectives
• Scaling networks with Network Address
Translation and Port Address Translation
• Dynamic Host Configuration Protocol
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Private Addressing
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NAT
• A NAT-enabled device typically operates
at the border of a stub network.
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NAT Terms
• Inside Local Addresses – An IP address assigned to a
host inside a network. This address is likely to be a RFC
1918 private address.
• Inside Global Address – A legitimate IP address
assigned by the NIC or service provider that represents
one or more inside local IP address to the outside world.
• Outside Local Address - The IP address of an outside
host as it known to the hosts in the inside network.
• Outside Global Address - The IP address assigned to a
host on the outside network. The owner of the host
assigns this address.
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NAT Features
• Static NAT is designed to allow one-to-one mapping
of local and global addresses.
• Dynamic NAT is designed to map a private IP
address to a public address.
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PAT Features
• PAT uses unique source port numbers on the inside
global IP address to distinguish between
translations.
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NAT Benefits
• Eliminates re-assigning each host a new
IP address when changing to a new ISP
• Eliminates the need to re-address all hosts
that require external access, saving time
and money
• Conserves addresses through application
port-level multiplexing
• Protects network security
© 2003, Cisco Systems, Inc. All rights reserved.
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Configuring NAT and PAT
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Configuring NAT
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Configuring PAT
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Verifying NAT and PAT Configuration
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Troubleshooting NAT and PAT
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Issues With NAT
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DHCP
• DHCP works by providing a process for a server
to allocate the IP information to clients. Clients
lease the information from the server for an
administratively defined period.
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BOOTP and DHCP Differences
• DHCP defines mechanisms through which
clients can be assigned an IP address for a
finite lease period. This lease period allows
for re-assignment of the IP address to another
client later, or for the client to get another
assignment, if the client moves to another
subnet. Clients may also renew leases and
keep the same IP address.
• DHCP provides the mechanism for a client to
gather other IP configuration parameters,
such as WINS and domain name.
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Major DHCP Features
• Automatic Allocation
• Manual Allocation
• Dynamic Allocation
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DHCP Operation
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The Order of DHCP Messages
Transmitting
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Configuring DHCP
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Configuring DHCP While Excluding IP
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Verifying DHCP
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Troubleshooting DHCP
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DHCP Relay
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