In this video, Todd Lammle provides insight to the Open Systems Interconnection (OSI) model as Cisco sees it for the CCENT exam. This high-level overview complements his CCNA Study Guide when studying the CCENT OSI objectives. Todd Lammle defines the upper three layers and layer 4 layers, concentrating on the Transport and Network Layer Protocols.
- [Instructor] The OSI Model has seven hierarchical layers…that were developed to enable different networks…to communicate reliably between disparate systems.…Since this video is centering upon all things CCNA…it's crucial for you to understand the OSI Model…as Cisco sees it, so that's how…I'll be presenting the seven layers to you.…Looking at this graphic, the OSI has seven different layers…divided into two groups.…The top three layers define how the applications…within the end stations will communicate…with each other as well with the users.…The bottom four layers define how the data…is transmitted end to end.…
When looking at the graphic, understand that users…interact with the computer at the Application layer…and also that the upper layers are responsible…for applications communicating between hosts.…None of the upper layers knows anything…about the networking or network addresses…because that's the responsibility of the four bottom layers.…You can see that it's these four bottom layers…that define how data is transferred…
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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