Todd Lammle covers the difference between the Internet layer and the Open Systems Interconnect (OSI) model's network layer. In addition, he discusses the Internet Protocol (IP) and the Internet Control Message Protocol (ICMP).
- [Teacher] In the DoD model, there are two main reasons…for the internet layer's existence: routing, and providing…a single network interface to the upper layers.…None of the upper or lower layer protocols…have any functions relating to routing.…That complex and important task belongs…entirely to the internet layer.…Without this layer, application programs would need…to write hooks into every one of their applications…for each different Network Access protocol.…This would not only be a pain in the neck,…but it would lead to different versions of each application,…one for ethernet, one for wireless, and so on.…
To prevent this, IP provides one single network…interface for the upper layer protocols.…All network roads don't lead to Rome, they lead to IP.…And all the other protocols at this layer…as well as all those at the upper layers use it.…Never forget that.…All paths to the DoD model go through IP.…Some of the protocols of the IP are Internet Protocol,…ICMP, or Internet Control Message Protocol,…and Address Resolution Protocol.…
For more information on the CCENT exam, visit Cisco's website.
- Overview of internetworking
- The TCP/IP networking model
- Easy subnetting
- Managing Cisco IOS
- Managing Cisco networks and devices
- IP routing
- Layer 2 switching
- VLANs and InterVLAN routing
- Network address translation
Skill Level Intermediate
Internetworking devices4m 20s
3. Introduction to TCP/IP
4. Easy Subnetting
5. VLSM, Summarization, and Troubleshooting TCP/IP
6. Cisco Internetworking Operating System (IOS)
7. Managing a Cisco Internetwork
8. IP Routing
9. Layer 2 Switching
10. VLANs and InterVLAN Routing (IVR)
12. Network Address Translation (NAT)
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