Questions about problems that arise when you connect multiple computers to form a network.

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1answer
11 views

How to scan an entire network, including every subnet

Hi so i'm trying to scan a network of mine, however i know there a several different subnets. I was wondering if there is a way to scan a network for each subnet, and then scan each subnet, creating a ...
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0answers
16 views

MIMO model and its linear algebra inside

I am a Computer Science student (BA) and need to write a seminar paper. my seminar is based on this research paper: Q-clouds now, in this paper a MIMO model is used in order to control performance ...
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0answers
13 views

What is the difference between disaster recovery at the data link layer and the transport layer?

What is the difference between disaster recovery in the network data transmission, when this process is performed by the link layer and the transport layer? The two approaches can be used together, or ...
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2answers
84 views

How to calculate probability of packet loss and drop rate?

In a queuing system (M/M/1) with a finite packet capacity $z$, how do you determine the probability of packet loss if we assume that packets are dropped when the system is full? Packets arrive with a ...
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19 views

Understanding Networking RTT over parallel connections

I have answers to questions but it doesn't explain how they got the answer. I already have the answers, I'm trying to understand them. Question 1: A DNS lookup is necessary to view a web page. ...
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0answers
17 views

hybrid or “mixed” networks

I am a mathematician, and I am completely lay in the technical aspects of computer networks and computer architecture. I would like to know if there is any computer network or architecture, protocol, ...
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2answers
52 views

Why is CAN protocol preferred to be used in automotive application?

Is it only because of the fact that it is asynchronous and can be used for long distance message transfer. An example of where other protocols will fail would help. Thanks.
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0answers
16 views

The maximum & minimum number of sources that can be multiplexed so that no data loss occurs on TOKEN BUCKET?

A link of capacity 100 Mbps is carrying traffic from a number of sources. Each source generates an on-off traffic stream; when the source is on, the rate of traffic is 10 Mbps, and when the source is ...
3
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1answer
48 views

Unsplittable flow in capacitated networks

I have an undirected network with capacitated links/edges. Between some nodes unsplittable traffic has to be routed. All demands and capacities are known, but it is uncertain if all flows can be ...
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1answer
36 views

Why the analysis of Aloha protocol uses Poisson distribution?

Pretty much in all of the analysis of the Aloha protocol that I read, it is assumed that the distribution of packet arrivals is Poisson. What is the rationale behind it? Isn't it actually binomial ...
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1answer
40 views

Why escape and escape in byte stuffing?

Denoting the two special bytes as FLAG and ESC, and any other as X, where FLAG denotes the start and end of the message and ESC is used to escape any flags within the original message, if the original ...
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0answers
21 views

Why are there so many available loopback addresses? [closed]

I don't really know whether this is the correct site where to post this question, I'm sorry if I'm mistaken. I am studying computer networks and during the explanation of the ip protocol the ...
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0answers
13 views

Reference for Motivation of WSN Localization in 3D

I need references to motivate the reader about 3D Wireless Sensor Network Localization problem. I have found many references about 2D WSN localization, however, there is a lack of 3D WSN Localization ...
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0answers
19 views

What is the correct term for “time to establish a connection”

I don't remember what is the term for "time to establish a connection". For example in a smartphone, when I lost the wifi signal and the phone try to get mobile data connection it spends a bit of ...
1
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1answer
32 views

Applying Brewer's theorem (CAP) to a single node

I'm going through Brewer's theorem and its proof by Nancy Lynch and Seth Gilbert. But the paper left me with one question. What prevents the theorem from being applicable to a single node? I haven’t ...
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2answers
44 views

Probability of Success in Slotted Medium Access

Suppose you have a network which uses time division multiplexing (i.e. Slotted Aloha). There are $N$ nodes each transmitting in a given slot with probability $p$. I understand that the probability a ...
1
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1answer
23 views

Aggregate Rate and Poisson Process in Aloha

I'm having a hard time understanding what is mean't by the aggregrate rate $\lambda$ and what it means for throughput in unslotted and slotted Aloha protocols. The more I seem to read about poission ...
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0answers
35 views

Question from GRE subject on finding the size of transport layer

I am here to ask for guidance to a question as to how approach to such questions not seeking answer to homework ,as this question i came across in an MCQ's book.so please realize before downvoting ...
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1answer
77 views

Which addresses belong to which network, given a fixed subnet mask?

The subnet mask for a particular network is 255.255.31.0. Which of the following IP address belongs to this network? 172.57.88,62 & 172.56.87.233 10.35.28.2 & 10.35.29.4 ...
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1answer
43 views

Find the approximate number of messages (n) that need to be tried

Find the approximate number of messages (n) that need to be tried before finding two that had the same message digest (size k) with probability 0.8. You need to find n as a function of k . What is n ...
2
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1answer
49 views

Choice of algorithm for hierarchical clustering for minimizing network communication costs

Suppose I have a large distributed task running on a cluster system where part of the workload is compute bound and part depends on network performance. Data transfer is not completely homogeneous ...
0
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1answer
41 views

How can one come up with reasonable IP subnet allocations?

An ISP has following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20 The ISP wants to give half of this chunk addresses to Organization A, and ...
0
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1answer
62 views

Layered Structures

I'm trying to check how general and valid protocol suite system ( layered structure ) are. Does anyone know if radio communication ( broadcast ) via AM or FM , for instance can be viewed in the light ...
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1answer
45 views

Selecting a M.S. in CS focus [closed]

I need to pick a focus in my Masters program. The running candidates are Networking Bioinformatics Data mining Computer Image Recognition In order to avoid this becoming a discussion, I'd be ...
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1answer
50 views

What's the point of Subnet Masks?

I'm having trouble understanding the point of Subnet Masks. I was reading a nice article on Tech-FAQ on the topic, but it has left me a bit confused. When I first heard about Subnets, it was ...
3
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2answers
287 views

Why is the throughput (performance) of the Slotted Aloha protocol ≈ 0.36

I've read that the throughput - that is, the amount of good useful messages relative to capacity - of the Slotted ALOHA protocol for communication networks is roughly 0.36%. But its not clear how we ...
2
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1answer
123 views

Why is the throughput (performance) of the Aloha protocol ≈ 0.18?

I've read in a few places (like here that the throughput - that is, the amount of good useful messages relative to capacity - of the ALOHA protocol for networks is roughly 0.18%. But its not clear ...
9
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1answer
122 views

Can the end-to-end principle be formalized?

In the late 1990s, when I was in graduate school, the paper JH Saltzer; DP Reed; DD Clark: End-to-end arguments in system design. ACM Trans. Comput. Syst. 2(4):277-288, 1984. ...
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1answer
32 views

TCP repeated acknowledgement

My professor has asked this (exam) question and it actually makes no sense to me: TCP offers a reliable, bidirectional byte stream over the best effort packet delivery in IP. For reliability, a ...
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votes
1answer
138 views

What is the maximum achievable throughput in this communication using sliding window protocol?

Station A is sending data to station B over a full duplex error free channel. A sliding window protocol is being used for flow control. The send and receive window sizes are 6 frames each. Each frame ...
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2answers
81 views

Why does packet data don't need trailer/footer while frame needs it?

Why does packet don't need trailer/footer while frame needs it? I am trying to understand networking concept regarding OSI & TCP/IP layering. I have googled a bit and it says that the footer in ...
3
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0answers
712 views

totally ordered multicast with Lamport timestamp

I'm studying Distributed Systems and synchronization and I didn't catch this solution of totally ordered multicast with Lamport timestamps. I read that it doesn't need ack to deliver a message to the ...
0
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1answer
204 views

Can we break the Shannon capacity? [closed]

I have a friend working in wireless communications research. He told me that we can transmit more than one symbol in a given slot using one frequency (of course we can decode them at the receiver). ...
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0answers
45 views

Picking an optimal initial congestion window size (high bw, high latency and short bursts)?

What is a known strategy to approach a situation where short bursts of data are being sent very often over a high bandwidth, high latency cable? I am aware of cubic but even that does not utilize a ...
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1answer
63 views

ARQ Protocols and sequence numbers [closed]

What will happen if sequence number is not used in an ARQ protocol (e.g, Go-back-N, selective repeat)?
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0answers
37 views

Buffering packets vs. low latency routing [closed]

I am considering strategies to compare the performance of routers with buffers vs. their lower latency counterparts in a simple network setting (N clients communicating with each other randomly ...
1
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1answer
532 views

Sliding window protocol, calculation of sequence number bits

I am preparing for my exams and was solving problems regarding Sliding Window Protocol and I came across these questions.. A 1000km long cable operates a 1MBPS. ...
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0answers
78 views

Closed network system that use OSI model to connect to another network?

The OSI model can be used for LAN and WAN networks, allowing the interconnection of [vendor] closed systems and it only informs what each layer have to do. Someone said that this phrase is false, ...
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1answer
270 views

Physical layer services & hardware protocols [closed]

I am searching the content of this topic but I am not sure what should be the content for this topic. This is relate to Computer Network. My topic is ...
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2answers
285 views

TCP congestion problem

Consider an instance of TCP’s Additive Increase Multiplicative Decrease(AIMD) algorithm where the window size at the start of the slow start phase is 2 MSS and the threshold at the start of the first ...
1
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1answer
92 views

How to present ping data from ICMP timestamp

The ICMP timestamp protocol is useful for determining which path — forward or reverse — is contributing to the jitter on the line. In an ideal world, all computers would have an excellent ntpd, and ...
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0answers
67 views

NTP: synchronisation of time between two machines for ICMP timestamping

Some guy on the internet recommends using the same ntp server when it is required to troubleshoot asymmetric routes through ICMP, and it's somewhat important to have synchronised time between the two ...
4
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2answers
190 views

Bipartite Graph Game

So say we have a bipartite graph G=(X,Y,E). Let's make a game out of it. I go first. I pick a node in X. You go next. You pick a node in Y that is connected by an edge to the node I picked. Next it's ...
2
votes
2answers
436 views

How to generate a connected random network topology for a specific number of nodes?

I'm trying to generate a random but realistic network topology so I can test the performance of some routing algorithms. I came across Waxman's model described in Routing of Multipoint Connections, ...
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1answer
151 views

difference between propagation speed and bandwidth in digital communication

I want to know difference between propagation speed and bandwidth in digital communication.I know bandwidth is no of bits in one second and propagation speed of signal is distance traveled by signal ...
0
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1answer
511 views

need of error control in transport layer

I want to know why error control is used in transport layer although it is used in data link layer?While data link layer has all data came from upper layers in its frames so its error control should ...
3
votes
1answer
57 views

What areas in EE overlap closely with CS

I am doing bachelors in Electronics & Communication Engg.. But most of my work happened to be in Web development.. I am thinking to do my bachelor thesis which very closely overlaps with my recent ...
2
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0answers
242 views

TCP delayed duplicate problem

The TCP(Transmission Control Protocol) delayed duplicate problem is discussed in Tannenbaum's "Computer Networks." The discussion references Tomlinson (1975) improved by Sunshine and Dayal (1978). ...
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2answers
406 views

How does DNS work if there is no recursive querying?

Suppose I type in the website www.youtube.com. The computer first asks a local domain name server (DNS) what the IP address of this website is. If it can't find ...
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2answers
388 views

Difference between encoding and modulation in transmission

What is the difference between encoding and modulation? I have seen these terms used sometimes inter-changeably and sometimes differently (the ratio is 50:50). Can somebody clearly explain this with ...