S-38.180 Quality of Service in Internet 2cr EXAMINATION 15.11.2004
Answer five out of six questions so that questions 1-2, 3-4 and 5-6 are on separate papers. Put your name, student number, course code and date to each paper. This helps you to receive your credits in fast and reliable manner. Those who do not have Finnish or Swedish as their native language, may answer in English. We will judge the answers based on their quality and clarity. We prefer short and down to the fact answers. You may explain things further but beware that errors may lower your points (even if they are in extra matter).
Good Luck !!!
1) Mitä MPLS-tekniikka on ja
mitä sillä voi tehdä? Millä kahdella eri tavalla
MPLS voidaan sovittaa toimimaan DiffServ-verkossa?
What is MPLS
and what can you do with it? How can you make MPLS work in a DiffServ
network (two different ways)? (6 p)
2) Kuvaa IntServ-reitittimen
referenssimalli, luettele eroavaisuudet ns. BestEffort-reitittimeen
ja kerro IntServ-reitittimen rakenneosien toiminnasta.
Illustrate
the reference model of the IntServ router implementation, list the
differences compared to a regular BestEffort- router and describe the
functionality of the IntServ router blocks. (6p)
3) DiffServ perustuu
pakettien eriyttämiseen loogisesti eroteltuihin BestEffort
verkkoihin. Mihin tämä eriyttäminen perustuu ja mitä
ongelmia tässä mallissa on suhteessa palvelun laadun
takaamiseen tai edes relatiivisten laatuluokkien
tuottamiseen.
Differentiated Services is based on logical
separation of packets into parallel BestEffort networks. To what is
this differentiation based and what are the problems related to this
model in providing QoS or even relative quality assurances
4) Reitittimillä on
välityspolulla kahden tyyppisiä resursseja käytössään,
joita ne voivat kontrolloida (eriyttää). Mitä
nämä resurssit ovat ja mitkä mekanismit näitä
resursseja ohjaavat. Millaisia toteutuksia/algorithms mekanismeille
löytyy pääpiirteissään.
Network routers
have two resources on their forwarding path which can be controlled
(differentiated). What are these resources and what are the
functional mechanisms controlling these resources. Mainly what kind
of implementations/algorithms there exists
for these mechanisms. (6p)
5) Esitä tapoja määritellä
pakettien viivejakauma. Mille sovellukselle tai mittaustavalle mikin
sopii? Mitä käyttäisit web-selailun
yhteydessä?
Describe different methods to describe packet
delay distribution. For which applications or measurments each one is
most applicable.Which one you would you use with web surfing? (6 p)
6) Millaisia ongelmia TCP:llä
on nykyaikaisissa verkoissa? Miten näitä ongelmia on
koetettu ratkaista?
What kind of problems there are for TCP in
current networks? What kind of solutions there are proposed for
these? (6 p)
Mika Ilvesmäki (1-2), Marko Luoma (3-4), Markus Peuhkuri (5-6)
Note: Remember to answer only to five
(5) questions!
You must return 3 papers, each group on its own.