Todd Lammle covers the difference between the transport/host-to-host layer and the Open Systems Interconnect (OSI) model. In addition, he discusses the details of the Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), as well as shows you the headers of each protocol.
- [Narrator] The main purpose of the Host-to-Host Layer…or Transport Layer is to shield the upper layer applications…from the complexities of the network.…This layer says to the upper layers,…just give me your data stream with any instructions…and I'll begin the process of getting…your information ready to send.…In this graphic we can see a TCP Header,…just remember TCP takes large blocks of information…from an application, and breaks them into segments.…It numbers and sequences each segment…so the destination's TCP stack can put the segments…back into the order the application intended.…
After this segments are sent on the transmitting host,…TCP waits for an acknowledgement…of the receiving end's TCP Virtual Circuit Session.…Re-transmitting, any segments set aren't acknowledged.…Now since the upper layers just entered data stream…at the protocols into the Transport layer,…I'll use this graphic to demonstrate how TCP segments…the data stream and prepares it for the internet layer.…So taking a look at this we can see,…
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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