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Homework 2
Out: Friday October 5
Due: Wednesday October 11 at the start of class
- Questions from Chapter 2 of the text:
13, 16, 21a (skip 21b), 26, 31, 49
-
Read the third of the primary references from the Further Reading
section of Chapter 1:
Clark, D. The design philosophy of the DARPA Internet protocols.
Proc. SIGCOMM '88 Symposium, 106-114, August 1988.
Available online here.
(Choose, for example, the PDF link in the upper right.)
You can skip Section 10 if you like -- it's about TCP, and we haven't
yet addressed it in enough detail to expect that
section to be easily understood.
In a writeup of no more than two pages, address these questions.
-
Consider this quote (last full paragraph of page 7):
As a rough rule of thumb for networks incorporated into
the architecture, a loss of one packet in a hundred is
quite reasonable, but a loss of one packet in ten suggests
that reliability enhancements be added to the network if
that type of service is required.
and what you know about Ethernet. What do the two have to
do with each other? What modification to the design
of Ethernet does it suggest considering?
-
This paper is a companion (and predecesssor) to the end-to-end paper.
It says (in the Introduction): ":For example, the idea of the datagram,
or connectionless service, ... has come to be the defining characteristic of
architecture into the IP and TCP layers."
By datagram it means that packets are treated individually, and
the network needn't try to consider possible
relationships to other packets (e.g., those between a single sender and
receiver, often called a flow).
As best you can, state briefly how the prioritized goals for the Internet
listed in the paper motivate this approach.
-
What, if anything, does this paper imply about whether sliding window
should or shouldn't be used between pairs of routers inside the network?
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