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W OPNET wyróznia sie trzy poziomy modelowania. Sa to:

Siec, wezeł, I proces

LAN, MAN, WAN

Siec, łacze, protokół

Protokół, łacze, pakiet

Aby wizualnie zgrupowac wiele elementów sieciowych do pojedynczego stosuje sie:

Netmask (maska sieciowa)

Subnet (podsiec)

Toolbox (przybornik)

Scenario (scenariusz)

Uzupełnij kod: compmodule #1 { submodules: submod1:#2; submod2: #2; #3: submod1.port --> submod2.port; }

1. Network 2. Submodule 3. topology

1. Module 2. Submodule 3. topology

1. Module 2. Submodule 3. connections

1. Network 2. Node 3. connections

Uzupełnij kod: FFGenerator::#1(cMessage *msg) { #2 *m = new #2("packet"); m->setBitLength(par("msgLength")); #3(m, "out"); scheduleAt(simTime() + deltaT, sendMessageEvent); }

1. receiveMessage 2. cMsg 3. send

1. handleMessage 2. cMessage 3. Send

1. handleEvent 2. cMessage 3.Receive

1. handleEvent 2. cMsg 3. Receive

FES (lub FEL) w Omnecie to:

Kolejka zawierajaca zdarzenia przyszłe

Kolejka zawierajaca zdarzenia, które juz wystapiły od poczatku symulacji

Tablica zawierajaca wszystkie moduły symulatora

Tablica zawierajaca wszystkie połaczenia miedzy modułami

Która sekwencja wykonywania metod jest prawdziwa dla klasy cSimpleModule?

CSimpleModule(); initialize(); finish(); ~cSimpleModule();

CSimpleModule(); initialize(); ~cSimpleModule(); finish();

Initialize(); cSimpleModule(); ~cSimpleModule(); finish();

Initialize(); cSimpleModule(); handleEvent(); ~cSimpleModule(); finish();

Mamy system kolejkowy, w którym czas pomiedzy zadaniami jest wykładniczy ze srednia 1. Zamieniamy rozkład czasu pomiedzy zadaniami na jednostajny uniform(0.1, 1.1), pozostawiajac reszte systemu bez zmian. W nowym systemie srednia długosc kolejki bedzie:

Wieksza niz poprzednio

Mniejsza niz poprzednio

Nie zmieni sie

Do wyswietlania przebiegów czasowych wykorzystujemy w Omnecie klase:

CLongHistogram()

CProcessDisplay()

C0utVector()

CStdDev()

System PlanetLab to zbudowany jest w oparciu o:

Superkomputer

Klaster komputerów umieszczony w osrodku badawczym w jednym osrodku naukowym

Komputery (wezły) rozproszone w róznych rejonach swiata w wielu osrodkach

Komputery spiete w system za pomoca wirtualnej sieci

Uzytkownik korzystajacy z systemu PlanetLab moze sie zalogowac do poszczególnych wezłów sieci PlanetLab za pomoca narzedzia:

FTP

SSH

Telnet

Winlogon

Wybierz zdania prawdziwe dotyczace systemu PlanetLab:

Aby uzytkownik mógł zalogowac sie do wezła sieci PlanetLab wezeł musi nalezec do slice przypisanego uzytkownikowi

Slice to zbiór zaalokowanych zasobów rozproszonych na PlanetLab

Uzytkownik systemu PlanetLab nigdy nie jest zwiazany z zadnym slice

Kazdy uzytkownik systemu PlanetLab ma swój własny slice, w którym pracuje

How does a host that has sent TCP data know that the data was received?

A TCP acknowledgement is sent from the receiver

An ICMP echo reply is sent from the receiver

An incremented TCP sequence number is sent from the receiver

A SYN/ACK is sent from the receiver

Which of the following best characterizes TCP versus UDP (in most cases)?

TCP is less reliable and quicker

TCP is slower, more reliable and requires more overhead

TCP is faster, more reliable and more streamlined

TCP is less reliable and connection-oriented

The slice is a ....

Set of allocated resources distributed across PlanetLab

Set of allocated resources on a single PlanetLab node

Physical location where PlanetLab nodes are located

Dedicated server that runs compmonents of PlanetLab services

The sliver is a ....

Set of allocated resources distributed across PlanetLab

Set of allocated resources on a single PlanetLab node

Physical location where PlanetLab nodes are located

Dedicated server that runs compmonents of PlanetLab services

TCP typically begins a session with:

The three-way handshake of client to server with SYN set, the server reposnse of SYN/ACK and the client acknowledgement of ACK.

The three-way handshake of server to client with SYN set, the client reposnse of SYN/ACK and the server acknowledgement of ACK.

TCP is note connection oriented so no handshake is required

A handshake consistinig of the client request to the server with SYN set and a server response of a SYN (...)

What is the output of the Omnet++ simulation?

The simulation results are recorded into output scalar (.sca) file

The simulation results are recorded into output vector (.vec) file

The simulation results are recorded into output vector (.vec) and output scalar (.sca) files

None of the above

What is the function of a router?

It determines the entire route for an IP packet from source to destination host

It uses ARP to route the packet to the next hop

It uses DNS to route the packet to the next hop

It attempts to move the IP packet one hop closer to the destination

Parameters applied to the simulation may be submitted in:

Configuration file, e.g. *.ini

Topology file, e.g. *ned

In the simulation code *.cpp

In the other way

The following languages are used for description of a simulation:

Protel

VHDL

Proto-C For OPNET

C/C++ For OMNET++

Results of the simulation are saved as:

Arrays, lists and scalars

Vectors and scalars

Vectors, scalars and animations

Arrays, vectors and lists

Fill spaces in the code: network #1 { #2: submod1: Node; submod2: Node; #3: submod1.port --> submod2.port; }

1. Network 2. nodes 3. topology

Module 2. networks 3. topology

1. Topology 2. submodules 3. connections

1. Network 2. submodules 3. connections

Fill spaces in the code: void FFGenerator::#1(cMessage *msg) { #2 *m = new #2("cPackage"); m->setBitLength(par("msgLength")); #3(m, "out"); scheduleAt(simTime() + deltaT, sendMessageEvent); }

1. handleMessage 2. cMessage 3. send

1. handleMessage 2. cPackage 3. send

1. handleEvent 2. cMessage 3.receive

1. handleEvent 2. cPackage 3. receive

To visually aggregate many network elements into a single element, the following elements are used:

Netmask

Subnet

Toolbox

Scenario

Which sequence is correct for the cSimpleModule class?

CSimpleModule(); initialize(); finish(); ~cSimpleModule();

CSimpleModule(); initialize(); ~cSimpleModule(); finish();

Initialize(); cSimpleModule(); ~cSimpleModule(); finish();

Initialize(); cSimpleModule(); handleEvent(); ~SimpleModule(); finish();

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