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CCENT/CCNA ICND1 Official Exam Certification Guide (CCENT Exam 640-822 and CCNA Exam 640-802), Second Edition by Wendell Odom - CCIE No. 1624

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Appendix I. Memory Tables Answer Key

Chapter 2

1:

Table I-1. Summary: Same-Layer and Adjacent-Layer Interactions

Concept

Description

Same-layer interaction on different computers

The two computers use a protocol to communicate with the same layer on another computer. The protocol defined by each layer uses a header that is transmitted between the computers, to communicate what each computer wants to do.

Adjacent-layer interaction on the same computer

On a single computer, one layer provides a service to a higher layer. The software or hardware that implements the higher layer requests that the next lower layer perform the needed function.

2:

Table I-2. OSI Functional Summary

Layer

Functional Description

Application (7)

Interfaces between network and application ...

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