In this last Ethernet section, Todd Lammle discusses data encapsulation and how data, segments, packets, frames, and bits are used to encapsulate data as it is prepared for transmission on the network. Todd ends this section with a look at the Cisco three-layer model, which includes the Core, Distribution, and Access layers. He also covers what is used at each layer and best design practices in line with the CCENT objectives.
- [Narrator] Now let's talk about data encapsulation.…When a host transmits data across a network…to another device,…the data goes through a process called encapsulation,…and is wrapped with protocol information…at each layer of the OSI Model.…Each layer communicates only with its pair layer,…on the receiving device.…To communicate and exchange information,…each layer uses what's called Protocol Data Units,…which is just a name for the data at each layer.…These hold the control information…that's attached to the data at each layer of the model.…
There usually attached in front of the data field,…but can be at the trailer, for example, with a frame.…So we attach to the data…by encapsulating on each layer of the OSI Model,…and each has a specific name,…depending on the information provided in the header.…In this graphic here, we can see the PDUs,…and how they attach control information to each layer.…In this graphic here,…we can see the transport layer PDU name is segment.…The network layer is packet,…data link is frame and physical layer is bits.…
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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