Answered: Tracing through Layers Given the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Tracing through Layers Given the following scenario, trace out the path the packets will follow in the diagram provided. An alternate method of specifying your answer is given that requires no drawing Scenario: Your laptop A opens a web page from the server F, and the web caching server keeps a copy of the page on its way back to you. A second user A' (who takes your place on the diagram) is on the same LAN as you, connected also to Router B, and opens the same web page. Draw the path the HTTP message requesting the page would take from its origin point at A' to its destination point where the packet would go no further. See diagram for more info

3. Tracing through Layers
Given the followving scenario, trace out the path the packets will follow in the diagram
provided. An alternate method of specifying your answer is given that requires no drawing.
Scenario: Your laptop A opens a web page from the server F, and the web caching server
keeps a copy of the page on its way back to you. A second user A' (who takes your place on
the diagram) is on the same LAN as you, connected also to Router B, and opens the same
web page. Draw the path the HTTP message requesting the page would take from its origin
point at A' to its destination point where the packet would go no further.
A
C
F
Laptop
Router
Web Caching
Router
Switch
Server
Router
4.
2.
2.
Instead of drawing, you can enter your values in the table below. If your trace starts at the
application layer of the Laptop, for example, you would enter "5" in the "Enter/Start" field
of A. Since it started at the highest layer it will need, enter "5" also in the "Highest Layer"
field. Then "1" for the "Exit/End" to show it left device A at layer 1.
Device Enter/Start
Highest
Layer
Exit/End
B
C.
E
F

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