# Questions tagged [protocols]

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### Usb transfer data to host

In the usb protocol a frame is send every 1msec to the device, if the host asks the device for data, how does the device send data to the host? Does it use a frame?
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### Exercise: Sliding window protocol: Bits for sequence number

This is a task in a lecture on computer networks: "Suppose you are designing a sliding window protocol for a 1-Mbps point-to-point link to the moon, which has a one-way latency of 1.25 seconds. ...
147 views

### Finding maximal and average number of time slots in an Adaptive tree walk protocol

Tried to research here and on other sites with no luck regarding finding the maximal and average number of time slots in an Adaptive tree walk protocol. i'll explain what i mean here: In a simple(...
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### Arthur-Merlin protocol

I recently learned about the Arthur-Merlin protocol, and we defined the complexity classes $AM,MA$. We have also seen that there exists a theorem stating that $AMAMAM...AM=AM$, however we have not ...
41 views

### Sending infinite frames in One-Bit Sliding WIndow Protocol?

I am reading Computer Networks by Andrew S. Tanenbaum and I wonder if there is a mistake in the protocol as I can't find any solution for the following scenario. Suppose the transmitter (A) has only ...
1k views

### Owned state in MOESI protocol-transitions?

I understand that MESI is a subset of the MOESI cache coherency protocol. But what does the Owned state in the MOESI protocol represent? What are the differences in state transition due to the extra ...
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### Given two or more nodes in a network, is it possible to determine the one-way link latencies between two nodes that share a bi-directional connection?

We already know that detecting the one-way latency between only two nodes is impossible. However, if I have a number of nodes in the same subnet that all know about each other, can measure round-trip ...
43 views

### Solving/mitigating the free rider problem without requiring identification?

Is there any algorithm/protocol out there to solve/mitigate the free rider problem without requiring identification? In a web system, I want to distribute exactly one virtual dollar per day to each ...
171 views

### Is a “protocol” a set of algorithms and data structures?

I'm not major in science at all and would like to verify whether my understanding is correct or not. I just did some googling about the definition of protocol, such as in this, this one, this one and ...
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### Go Back N question(netwrok)

Hello I am trying to understand the GBN protocol and I encountered the following question during my homework. Assume that we have GBN protocol with a window size of 20. The sender sends 15 packets ...
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### Intuition for the convergence of the distance vector routing protocols

What is an intuitive way to think about the convergence of the distance vector routing algorithm? According to Wikipedia: Distance-vector routing protocols use the BellmanāFord algorithm and Fordā...
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### Explanation for the proof “Every 2-thread consensus protocol has a bivalent initial state”

From the book 'the art of multiprocessor programming': A protocol state is bivalent if the decision value is not yet fixed: there is some execution starting from that state in which the threads ...
136 views

### utilization of bitmap protocol

I am curious about utilization calculation in the bitmap protocol. especially if there's a difference between if only station 0 wants to broadcast(and the others doesn't) or only some other station ...
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### Affects of altering a line in “stop and wait” protocol(no noises)

what will happen if we change "to_physical_layer(&s)" to "to_physical_layer(&r)" in the following code(marked in the code where)? does it make the protocol fail? if so, show a scenario it ...
62 views

### How to decide which bytes will form a packet ?(computer networks)

In wireless communication , I understand what it means to transmit a "bit" but I wanted to understand what exactly does it mean by a packet . *******POST EDIT/RECEIVING INITIAL ANSWERS******* I got ...
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### When packets are not full?

When in computer networks it happens that the packets are not full? I have heard that sometimes in UDP that happens, if thatās the case, why not all the space is not used?
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### Why are so many internet protocols text-based?

From what I have found, a very large amount of protocols that travel over the internet are "text-based" rather than binary. The protocols in question include, but are not limited to HTTP, SMTP, FTP (I ...
102 views

### Chord protocol - How should I go about mapping nodes to placeholders on the ring?

In the real world, how is a node mapped to the position on the ring, Each nodes's IP address is hashed using SHA-1 hashing algorithm which will produce this hash - 73.128.154.69 hashed into ...
31 views

### Is there an existing protocol where a sender does not know who he is sending data to?

I was thinking about how the BitTorrent protocol automatically gives every peer a list of IPs of every other user who is currently seeding / leeching off the torrent in question. Is there an existing ...
8k views

### Measuring one way network latency

This is a puzzle about measuring network latency that I created. I believe the solution is that it's impossible, but friends disagree. I'm looking for convincing explanations either way. (Though it is ...
683 views

### Why is RTS/CTS optional?

I was reading in Wikipedia about it and one of the main things that were pointed out was that it is only an optional mechanism. This bugs me more than it should as I cannot find any information that I ...
584 views

### MESI Protocol Invalid cache line is attempted to be stored?

I am implementing a sample MESI simulator having two levels of cache (write back). I have added MESI status bits to both levels of cache. As it is a write back cache, the cache line is updated to L2 ...
172 views

### How is there a CPU read misses on exclusive caches?

If the lower level cache contains blocks that are not present in the higher level cache or other caches then it is said to be exclusive. It is exclusive because it is only there. How can there be ...
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### Importance of NeedhamāSchroeder Protocol

I'm working on a paper about model checking on cryptographic protocols and many of the papers I have read, base their approaches in the Needham-Schroeder protocol. I undestand this was one of the ...
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### The throughput of the ALOHA protocol if the Binomial distribution was used

In all the examples of ALOHA I've seen, the Poisson distribution is used. Theoretically, how could the throughput be calculated if a Binomial distribution was used instead? For example, in the case ...