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some information for first-year or second-year graduate students who are looking for
COMP 991 research opportunities.
The Internet has grown tremendously along several dimensions over the past two
decades. Yet, the core transport mechanisms used in its operation have not
In particular, after observing network congestion in the late 80s and early
90s, several congestion control mechanisms---instantiated mostly as different
versions of the TCP protocol---were developed. These mechanisms are
ubiquitously deployed today. Meanwhile, the Internet infrastructure has grown
by several orders of magnitude, both in its structure as well as
It is difficult to blindly believe that the assumptions on which network
designs were based a decade ago are valid even today. It is natural to ask:
- Is there any congestion in today's Internet? If so, where is it?
- Are assumptions used in the design of legacy transport mechanisms valid
- How does the invalidity of assumptions impact past work?
- How can mechanisms and analysis techniques be redesigned after discarding
Unfortunately, we do not know the answers to most of these fundamental
It is the goal of our research to answer these by:
- Developing measurement and analysis techniques that enable end-users to
develop a fundamental understanding of the transport performance of networks
and validate legacy assumptions.
- Studying the impact of invalid assumptions on the design, analysis, and
evaluation of existing transport mechanisms.
- Designing new mechanisms and analysis techniques after discarding
high-impact invalid assumptions.