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What is a spanning tree?

A subset of all edges

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What is a minimum spanning tree?

If the edges have costs, the MST is defined as the spanning tree with minimum total costs

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What is the Kendall Notation for the following system:

A telephone company with one incoming telephone line, which gets multiplexed into 5 service lines. The incoming calls can be described with a uniform distribution, while the service process is deterministic and takes exactly 3 seconds to process. The waiting buffer is considered to be infinite.

G/D/5/inf

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Wofür stehen L, L_q, P_W, P_B, N und c in der queuing theorie?

L: Average number of customers in the system

L_q: Average number of customers in the buffer (queue)

P_W: Probability of waiting

P_B: Probability of loss or blocking

N: Queue length

c: Service stations

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What can be stated about the mean and the variance of the Poisson distribution?

They are the same

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What is network simulation?

A program models the behaviour of a network by calculating the interaction between the individual entities (node) either with the help of mathematical formulas or by capturing and playing back real world observations

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Advantages of network simulation?

- Hardware- independent studies

- Environment- independent studies

- Low-cost

- Fast evaluation of many different scenarios and parameter settings

- Repeatability of experiments

- Visibility of experiments (debugging)

- Step-wise adding of complexity possible

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Disadvantages of network simulation?

- Simulation can only mimic reality, can never reach its complexity

- Targeted environment might not be covered in simulation models

- Real hardware with its properties is not captured

- Slight differences in simulation settings result in completely different behaviour - error-prone process

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Which simulation basics need to be simulated?

- Time

- Network participants or nodes

- Continuous processes at the nodes

- Connections between nodes and their properties

- Information exchange between nodes

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What is a network node?

A single, independent unit in an environment: a body, a building, an organism, a device, etc.

The node acts independently of all other nodes in the network and has the ability to communicate with other nodes

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Which properties can connections between nodes have?

- Direction

- Latency

- Capacity

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What is the simulation kernel?

The conductor, who orchestrates the simulation

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Communication Networks: Theory at Universität Bremen

Flashcards and summaries for Communication Networks: Theory at the Universität Bremen

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