Network Address Translation (NAT) is a great protocol. Todd Lammie helps you understand this protocol, with three different options to configure: static, dynamic, and NAT overload. This video also provides what you need to move onto the other video in this series.
- Network Address Translation, or NAT, was originally intended to slow the depletion of available IP address space by allowing multiple private IP addresses to be represented by a much small number of public IP addresses. Since then, it's been discovered that NAT is also a useful tool for network migrations, mergers, server load sharing and creating virtual servers. So in this chapter, I'm going to describe the basics of NAT functionality and the terminology common to NAT.
The Cisco objectives for NAT are very straight forward. You have hosts on your inside corporate network using RFC 1918 addresses and you need to allow those hosts access to the internet by configuring NAT translations. Because we'll be using ACL's in our NAT configurations, it's important that you're really comfortable with the skills you learned in the previous security video, before proceeding with this one. Because NAT decreases the overwhelming amount of public IP addresses required in a networking environment, it comes in handy when you need to connect to the internet and you're hosts don't have globally unique IP addresses.
NAT is a useful tool when two companies that have duplicate internal addressing schemes merge. Since each one can be maintained without any conflicting IP addresses. NAT is also a great tool to use when an organization changes its internet service provider, but the network manager needs to avoid the hassle of changing the internal addressing scheme. On one hand, NAT has a number of benefits. It conserves legally registered addresses. It remedies address overlap events.
Increases flexibility when connecting to the internet and it eliminates address renumbering as the network evolves. On the other hand, Network Address Translation also has some serious snags that you need to understand too. Translation also results in switching path delays. It causes loss of end-to-end IP traceability. Certain applications won't function with NAT enabled. And it complicates tunneling protocols, such as IPsec, because NAT modifies the values in the header.
NAT is truly a life-saver. But as you can see, NAT has a bit of a dark side.
Author
Released
9/30/2016For more information on the CCENT exam, visit Cisco's website.
- Overview of internetworking
- Ethernet
- The TCP/IP networking model
- Easy subnetting
- VLSM
- Managing Cisco IOS
- Managing Cisco networks and devices
- IP routing
- Layer 2 switching
- VLANs and InterVLAN routing
- Security
- Network address translation
- IPv6
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome54s
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The CCNA exam58s
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Lab environment overview1m 3s
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1. Internetworking
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Internetworking devices4m 20s
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2. Ethernet
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Ethernet overview2m 23s
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Ethernet addressing3m 51s
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Ethernet cables4m 55s
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3. Introduction to TCP/IP
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Overview of TCP/IP model2m 40s
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Application/process layer2m 19s
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Internet layer3m 37s
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IP addressing4m 33s
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4. Easy Subnetting
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Subnet basics1m 28s
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Subnet block sizing5m 25s
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Subnet by example5m 6s
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Class B subnetting3m 53s
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5. VLSM, Summarization, and Troubleshooting TCP/IP
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VLSM2m 38s
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VLSM by hand6m 28s
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6. Cisco Internetworking Operating System (IOS)
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Introduction to the IOS CLI3m 55s
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Basic CLI commands5m 23s
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Telnet and SSH5m 4s
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7. Managing a Cisco Internetwork
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Router and switch components2m 27s
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Configure DHCP3m 48s
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8. IP Routing
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Overview of IP routing3m 45s
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The IP routing process3m 50s
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Configure IP routing6m 41s
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Static routing5m 28s
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Default routing5m 36s
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Configure RIPv26m 52s
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Verify RIPv2 routing5m 55s
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9. Layer 2 Switching
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Configure a Catalyst switch7m 33s
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Configure port security5m 5s
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10. VLANs and InterVLAN Routing (IVR)
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Overview of VLANs3m 2s
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Configure VLANs3m 8s
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Configure trunk links5m 15s
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Configure IVR on a router2m 42s
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11. Security
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Introduction to access lists2m 24s
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Configure access lists4m 3s
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12. Network Address Translation (NAT)
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Introduction to NAT2m 18s
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Static NAT2m 53s
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Configure static NAT3m 11s
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Dynamic NAT2m 44s
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Configure dynamic NAT3m 44s
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NAT overload (PAT)3m 56s
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Configure NAT overload5m 26s
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13. IPv6
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Introduction to IPv62m 22s
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Overview of ICMPv62m 55s
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Configure IPv66m 7s
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Conclusion
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Next steps51s
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Video: Introduction to NAT