CS610 Computer Network Assignment # 3 Solution Spring 2013
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CS610 Computer Network Assignment # 3 Solution Spring 2013
by plhr60 Sun Jun 16, 2013 4:48 am
| Objective To have the clear understanding of the following networking concepts: · Networking Delay · Throughput · Relationship between throughput and delay Uploading instructions: Please view the Assignment Submission Process document provided to you by the Virtual University for uploading assignments.
Rules for Marking: It should be clear that your assignment will not get any credit if: · The assignment is submitted after due date. · The submitted assignment does not open or file is corrupted. · Your assignment is copied from internet, handouts or from any other student (Strict disciplinary action will be taken in this case). | ||||||||||||||||
| Assignment | ||||||||||||||||
| Question No. 1 [5 Marks] Consider an internet service provider which has a large network with idle delay of 5 milliseconds (without any network utilization). Your task is to fill the following table to show the effective delay (in milliseconds) according to Current network utilization and also give the mathematical formula to find out the effective delay according to current utilization.
Question No. 2 [5 Marks]
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Re: CS610 Computer Network Assignment # 3 Solution Spring 2013
by plhr60 Sun Jun 16, 2013 4:48 am
Network delay
Network delay is an important design and performance characteristic of a computer network or telecommunications network. The delay of a network specifies how long it takes for a bit of data to travel across the network from one node or endpoint to another. It is typically measured in multiples or fractions of seconds. Delay may differ slightly, depending on the location of the specific pair of communicating nodes. Although users only care about the total delay of a network,[citation needed] engineers need to perform precise measurements. Thus, engineers usually report both the maximum and average delay, and they divide the delay into several parts:
Processing delay - time routers take to process the packet header
Queuing delay - time the packet spends in routing queues
Transmission delay - time it takes to push the packet's bits onto the link
Propagation delay - time for a signal to reach its destination
Network delay is an important design and performance characteristic of a computer network or telecommunications network. The delay of a network specifies how long it takes for a bit of data to travel across the network from one node or endpoint to another. It is typically measured in multiples or fractions of seconds. Delay may differ slightly, depending on the location of the specific pair of communicating nodes. Although users only care about the total delay of a network,[citation needed] engineers need to perform precise measurements. Thus, engineers usually report both the maximum and average delay, and they divide the delay into several parts:
Processing delay - time routers take to process the packet header
Queuing delay - time the packet spends in routing queues
Transmission delay - time it takes to push the packet's bits onto the link
Propagation delay - time for a signal to reach its destination
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Re: CS610 Computer Network Assignment # 3 Solution Spring 2013
by plhr60 Sun Jun 16, 2013 4:49 am
Throughput
In communication networks, such as Ethernet or packet radio, throughput or network throughput is the average rate of successful message delivery over a communication channel. This data may be delivered over a physical or logical link, or pass through a certain network node. The throughput is usually measured in bits per second (bit/s or bps), and sometimes in data packets per second or data packets per time slot.
The system throughput or aggregate throughput is the sum of the data rates that are delivered to all terminals in a network.
The throughput can be analyzed mathematically by means of queueing theory, where the load in packets per time unit is denoted arrival rate λ, and the throughput in packets per time unit is denoted departure rate μ.
In communication networks, such as Ethernet or packet radio, throughput or network throughput is the average rate of successful message delivery over a communication channel. This data may be delivered over a physical or logical link, or pass through a certain network node. The throughput is usually measured in bits per second (bit/s or bps), and sometimes in data packets per second or data packets per time slot.
The system throughput or aggregate throughput is the sum of the data rates that are delivered to all terminals in a network.
The throughput can be analyzed mathematically by means of queueing theory, where the load in packets per time unit is denoted arrival rate λ, and the throughput in packets per time unit is denoted departure rate μ.
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Re: CS610 Computer Network Assignment # 3 Solution Spring 2013
by plhr60 Sun Jun 16, 2013 4:49 am
throughput
The amount of data transferred from one place to another or processed in a specified amount of time. Data transfer rates for disk drives and networks are measured in terms of throughput. Typically, throughputs are measured in kbps, Mbps and Gbps.
Throughput defines how much useful data can be transmitted per unit time. It is equal to the bandwidth if there is no protocol. However, in most practical cases the throughput is less than the bandwidth for two reasons:
protocol overhead: protocols use some bytes to transmit protocol information. This reduces the throughput
protocol waiting times: some protocols may force you to wait for some event.
Delay in data networks is generally the round trip delay (also called Round Trip Time - RTT) for a packet within the network. Network delay is composed of the following parts:
Processing delay - time routers take to process the packet header.
Queuing delay - time the packet sits in routing queues.
Transmission delay - time it takes to push the packet's bits onto the link
Propagation delay - the time taken by the front of a signal to reach the destination. Propagation of an electromagnetic signal is the speed of light (also called celerity). It depends on the wavelength and the medium in which the signal is propagating. For example propagation of signal in twisted pair is 0.66c where c is speed of light.
The amount of data transferred from one place to another or processed in a specified amount of time. Data transfer rates for disk drives and networks are measured in terms of throughput. Typically, throughputs are measured in kbps, Mbps and Gbps.
Throughput defines how much useful data can be transmitted per unit time. It is equal to the bandwidth if there is no protocol. However, in most practical cases the throughput is less than the bandwidth for two reasons:
protocol overhead: protocols use some bytes to transmit protocol information. This reduces the throughput
protocol waiting times: some protocols may force you to wait for some event.
Delay in data networks is generally the round trip delay (also called Round Trip Time - RTT) for a packet within the network. Network delay is composed of the following parts:
Processing delay - time routers take to process the packet header.
Queuing delay - time the packet sits in routing queues.
Transmission delay - time it takes to push the packet's bits onto the link
Propagation delay - the time taken by the front of a signal to reach the destination. Propagation of an electromagnetic signal is the speed of light (also called celerity). It depends on the wavelength and the medium in which the signal is propagating. For example propagation of signal in twisted pair is 0.66c where c is speed of light.
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Re: CS610 Computer Network Assignment # 3 Solution Spring 2013
by plhr60 Sun Jun 16, 2013 4:50 am
Q No.1
Formula:
D = D0 / (1-U)
Q No.2
Bits present in network = D * T
Formula:
D = D0 / (1-U)
Q No.2
Bits present in network = D * T
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