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Muhammad_Manan
about 5 years ago
Computer Networks
Q2: Consider the following content delivery problem facing an ISP for mobile networking:
A large number N of mobile users (think about spectators in a large football stadium) are interested in downloading the same content of size F (e.g., a video stream following a scoring drive). The ISP has a total bandwidth of B which can be used to communicate content to the mobile nodes. If this bandwidth B is split across all N users, the download delay would be around F ∗ N/B. For large N, this delay was deemed unacceptable. As a solution, the ISP is contemplating the use of a hybrid protocol, whereby it pushes the content to some of the mobile nodes (seeders) while also allowing these nodes to relay that content to other nodes, until the content reaches all nodes in the network. In particular, it is assumed that each mobile device has two modes of communication – using a direct link to the provider (through a cellular connection to the ISP) and using peer-to-peer communication with neighboring mobile devices (through an 802.11 channel). Moreover, each mobile device is able to measure and report back to the ISP the set of other mobile devices within communication range and the bandwidth to each such device.
(a) How might the ISP decide on the appropriate number of “seeders” to use?
(b) Assuming that the ISP wants to use K seeders, how might it choose these seeders? Rather than sending the entire content to a set of nodes (seeders), the ISP may view the set of mobile nodes as a swarm, and thus send different “pieces” of the content to different “leechers”.
(c) What is different about a swarming solution in this setting, compared to one in a wired networking setting?
(d) How might the ISP go about distributing pieces of the content to specific leechers under such setting?
0
muhammad-owais-7300
about 5 years ago
Computer Networks
How might the ISP go about distributing pieces of the content to specific leechers under such setting?
Consider the following content delivery problem facing an ISP for mobile networking: A large number N of mobile users (think about spectators in a large football stadium) are interested in downloading the same content of size F (e.g., a video stream following a scoring drive). The ISP has a total bandwidth of B which can be used to communicate content to the mobile nodes. If this bandwidth B is split across all N users, the download delay would be around F ∗ N/B. For large N, this delay was deemed unacceptable. As a solution, the ISP is contemplating the use of a hybrid protocol, whereby it pushes the content to some of the mobile nodes (seeders) while also allowing these nodes to relay that content to other nodes, until the content reaches all nodes in the network. In particular, it is assumed that each mobile device has two modes of communication – using a direct link to the provider (through a cellular connection to the ISP) and using peer-to-peer communication with neighboring mobile devices (through an 802.11 channel). Moreover, each mobile device is able to measure and report back to the ISP the set of other mobile devices within communication range and the bandwidth to each such device.
0
muhammad-owais-7300
about 5 years ago
Computer Networks
(c) What is different about a swarming solution in this setting, compared to one in a wired networking setting?
Consider the following content delivery problem facing an ISP for mobile networking: A large number N of mobile users (think about spectators in a large football stadium) are interested in downloading the same content of size F (e.g., a video stream following a scoring drive). The ISP has a total bandwidth of B which can be used to communicate content to the mobile nodes. If this bandwidth B is split across all N users, the download delay would be around F ∗ N/B. For large N, this delay was deemed unacceptable. As a solution, the ISP is contemplating the use of a hybrid protocol, whereby it pushes the content to some of the mobile nodes (seeders) while also allowing these nodes to relay that content to other nodes, until the content reaches all nodes in the network. In particular, it is assumed that each mobile device has two modes of communication – using a direct link to the provider (through a cellular connection to the ISP) and using peer-to-peer communication with neighboring mobile devices (through an 802.11 channel). Moreover, each mobile device is able to measure and report back to the ISP the set of other mobile devices within communication range and the bandwidth to each such device.
0
muhammad-owais-7300
about 5 years ago
Computer Networks
Assuming that the ISP wants to use K seeders,
Consider the following content delivery problem facing an ISP for mobile networking: A large number N of mobile users (think about spectators in a large football stadium) are interested in downloading the same content of size F (e.g., a video stream following a scoring drive). The ISP has a total bandwidth of B which can be used to communicate content to the mobile nodes. If this bandwidth B is split across all N users, the download delay would be around F ∗ N/B. For large N, this delay was deemed unacceptable. As a solution, the ISP is contemplating the use of a hybrid protocol, whereby it pushes the content to some of the mobile nodes (seeders) while also allowing these nodes to relay that content to other nodes, until the content reaches all nodes in the network. In particular, it is assumed that each mobile device has two modes of communication – using a direct link to the provider (through a cellular connection to the ISP) and using peer-to-peer communication with neighboring mobile devices (through an 802.11 channel). Moreover, each mobile device is able to measure and report back to the ISP the set of other mobile devices within communication range and the bandwidth to each such device.
0
muhammad-owais-7300
about 5 years ago
Computer Networks
How might the ISP decide on the appropriate number of “seeders” to use?
Consider the following content delivery problem facing an ISP for mobile networking: A large number N of mobile users (think about spectators in a large football stadium) are interested in downloading the same content of size F (e.g., a video stream following a scoring drive). The ISP has a total bandwidth of B which can be used to communicate content to the mobile nodes. If this bandwidth B is split across all N users, the download delay would be around F ∗ N/B. For large N, this delay was deemed unacceptable. As a solution, the ISP is contemplating the use of a hybrid protocol, whereby it pushes the content to some of the mobile nodes (seeders) while also allowing these nodes to relay that content to other nodes, until the content reaches all nodes in the network. In particular, it is assumed that each mobile device has two modes of communication – using a direct link to the provider (through a cellular connection to the ISP) and using peer-to-peer communication with neighboring mobile devices (through an 802.11 channel). Moreover, each mobile device is able to measure and report back to the ISP the set of other mobile devices within communication range and the bandwidth to each such device.
0
Junaid_Butt
about 5 years ago
Computer Networks
I need Solution of "A fundamental problem with the current Internet architecture is that of naming and addressing."
A fundamental problem with the current Internet architecture is that of naming and addressing. For example, some studies attribute difficulties with supporting mobility and multihoming to the flaw that the “IP address semantics are overloaded”.
(a) What is meant by this flaw?
(
b) A so-called “Loc / id split” approach has been proposed to try to eliminate such semantics overloading. Describe how this approach achieve such objective.
(
c) Comment on the pros and/or cons of loc / id split architecturally and in terms of impact on both the data and control planes.
0
anh-nguyen-yj6
over 1 year ago
Computer Networks
I need to assignment 2 databases, can anyone help me?
I need to assign 2 databases, can anyone help me?
1
ashnawosadhi-lochana
almost 4 years ago
Computer Networks
how to create a database design and development assignment
with practical
further for my question i need the sure parctical to prove
1
sadik-marine
about 4 years ago
Computer Networks
Describe 3 ways to achieve QoS in multimedia systems
please help me solve the question above is an assignment
1
muhammad-ahsan-13
over 4 years ago
Computer Networks
How to calculate file distribution time of following example?
Consider distributing a file of size F = 10 Gb to N peers. The server has an upload rate of Us = 20 Mbps, and each peer has a download rate of Di = 3 Mbps and an upload rate of U. We have N peers in total.
a. Assume U = 700Kbps. Calculate and compare the total amount of time needed to distribute the file for N = 5 and N = 50. How does increasing N affect this comparison ?
b. Assume N = 50. Compare this time for U = 200 Kbps and U = 500 Kbps. How does increasing peer’s upload rate (U) affect this comparison?
2
moazzam-kiani-1
over 4 years ago
Computer Networks
How to calculate file distribution time of following example?
Computer networks and communications calculating file distribution time
Consider distributing a file of size F = 10 Gb to N peers. The server has an upload rate of Us = 20 Mbps, and each peer has a download rate of Di = 3 Mbps and an upload rate of U. We have N peers in total.
a. Assume U = 700Kbps. Calculate and compare the total amount of time needed to distribute the file for N = 5 and N = 50. How does increasing N affect this comparison ?
b. Assume N = 50. Compare this time for U = 200 Kbps and U = 500 Kbps. How does increasing peer’s upload rate (U) affect this comparison?
1
moazzam-kiani-1
almost 5 years ago
Computer Networks
My question is related to computer networks and communication
Consider an application that transmits data at a steady rate (for example, the sender generates an N-bit unit of data every k time units, where k is small and fixed). Also, when such an application starts, it will continue running for a relatively long period of time. Answer the following questions, by briefly justifying your answer:
a. Why would a packet-switched network or a circuit-switched network be more appropriate for this application?
b. Suppose that a packet-switched network is used and the only traffic in this network comes from such applications as described above. Furthermore, assume that the sum of the application data rates is less than the capacities of each and every link. Is some form of congestion control needed? Why?
1
arold
about 12 years ago
Computer Networks
What are the four causes, or components, of delay in a packet switched network? What can be done to reduce each of these components?
I am doing Research work in Networking delays. Could someone help me with the delay in packet switched networks and how they can be minimized?
6
arold
about 12 years ago
Computer Networks
What is the key difference between distance-vector and link-state routing protocols in terms of how protocol messages are sent?
Today I attended a lecture regarding routing protocols. I am not clear with the concept of link-state routing protocol and distance vector protocol. If anyone could help?
6
arold
about 12 years ago
Computer Networks
What is the purpose of hierarchical address in the Internet? Explain how the hierarchical address is used in IP routing.
I study about IP addressing but could not understand the purpose of this hierarchical address. Please explain why and how this address is used?
6
arold
about 12 years ago
Computer Networks
100%
What is a bridge? What is a switch? What are the motivations to use bridges and switches?
I have studied about network topologies but I am confused with the terms Bridge and Switch are they different from one another?
6
arold
about 12 years ago
Computer Networks
What is a jitter buffer? How does it work? Why is it needed?
I am doing research work on various Buffer used in network topology. Could anyone explain about jitter buffer and its uses?
6
arien
about 12 years ago
Computer Networks
What are the three desirable properties of secure communications?
I have to give a presentation on secure communication. I am looking for the properties that should be present in secure communication setup. If anyone could help?
6
Computer Networks