- Foundation Topics
- Exam Preparation Tasks
- Review Questions
This chapter is from the book
This chapter is from the book
This chapter is from the book
Exam Preparation Tasks
Review All the Key Topics
Review the most important topics from inside the chapter, noted with the Key Topic icon in the outer margin of the page. Table 2-2 lists these key topics and the page numbers where each is found.
Table 2-2 Key Topics for Chapter 2
| Key Topic Element | Description | Page Number |
| List | Layers of the OSI model | 33 |
| Figure 2-3 | Protocol data unit names | 35 |
| Figure 2-4 | Layer 1: The physical layer | 35 |
| Figure 2-8 | Layer 2: The data link layer | 39 |
| Figure 2-9 | Layer 3: The network layer | 42 |
| Figure 2-10 | Layer 4: The transport layer | 44 |
| Figure 2-11 | TCP sliding window | 45 |
| Figure 2-12 | Layer 5: The session layer | 46 |
| Figure 2-13 | Layer 6: The presentation layer | 47 |
| Figure 2-14 | Layer 7: The application layer | 48 |
| Figure 2-15 | TCP/IP stack | 50 |
| Figure 2-16 | IP Version 4 packet format | 51 |
| Figure 2-17 | TCP segment format | 52 |
| Figure 2-18 | UDP segment format | 53 |
| Figure 2-19 | Example: Port numbers and IP addresses | 54 |
| Table 2-1 | Application layer protocols/applications | 54 |
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Complete Tables and Lists from Memory
Print a copy of Appendix C, “Memory Tables,” or at least the section for this chapter, and complete as many of the tables as possible from memory. Appendix D, “Memory Tables Answer Key,” includes the completed tables and lists so you can check your work.
Define Key Terms
Define the following key terms from this chapter, and check your answers in the Glossary:
Open Systems Interconnection (OSI) reference model
protocol data unit (PDU)
current state modulation
state transition modulation
cyclic redundancy check (CRC)
physical layer
data link layer
network layer
transport layer (OSI model)
session layer
presentation layer
application layer (OSI model)
network interface layer
Internet layer
transport layer (TCP/IP stack)
application layer (TCP/IP stack)
time-division multiplexing (TDM)
Transmission Control Protocol (TCP)
User Datagram Protocol (UDP)
TCP/IP stack
Complete Chapter 2 Hands-On Labs in Network+ Simulator Lite
Matching Well-Known Port Numbers
TCP/IP Protocols and Their Functions
Network Application Protocols
OSI Model Layer Functions
Additional Resources
Bring the OSI Model to Life: http://www.ajsnetworking.com/osi-life
The OSI Reference Model: https://youtu.be/OHpzuPvQygU
The OSI Model Challenge: http://ajsnetworking.com/osiquiz1