0

We first apply access control methods to get access to the channel link followed by the flow control methods to stop the receiver from overflowing.

Suppose we are using CSMA/CD in access control method then it has own throughput, efficiency etc. And in flow control we are using suppose Go-back-n(GBN) mechanism then it has also own throughput, efficiency etc.

My question is what is the difference between access control throughput, efficiency and flow control throughput, efficiency?

Improve this question
5
  • I don't understand the question. throughput is number of successfully transmitted bytes/sec, efficiency is presumably link utilization which is [time spent on something successfully transmitted]/[total time spent] (usually measured over some repeated interval). You can either measure or model said values for method X. Then you get values for method X. If method X is not the same as method Y, then the values would be different. You can measure a real system, having method X, Y, and Z. They you will get value for a combination X, Y, Z. (you can probably model too, but i never saw this done).
    – Effie
    Commented Mar 2, 2022 at 16:13
  • so, i guess throughput and efficiency of access control and flow control are just different values of the same quantities measured for access control and flow control respectively. Since I only saw these values (or models) in isolation, I would assume that the value of access control does not take flow control into account and vice versa.
    – Effie
    Commented Mar 2, 2022 at 16:15
  • @Effie could you answer this question, I waiting for your answer.I need to understand throughout, efficiency of flow control of laye4, layer2(LLC Sublayer of DLL) and access control efficiency, throughput layer2(Mac Sublayer) ?
    – S. M.
    Commented Mar 2, 2022 at 16:24
  • I don't remember how to do it, and I would have to google it as well.
    – Effie
    Commented Mar 2, 2022 at 16:25
  • @Effie could we say access control throughput is less than flow control throughput? please differentiate access control throughput and flow control throughput? Please reply... I am still waiting for your reply.
    – S. M.
    Commented Mar 9, 2022 at 20:06

1 Answer 1

Reset to default
1

(Ethernet) Flow Control uses pause frames to slow down a sender when it's sending more data than the receiver can handle. It can cause head-of-line blocking and needs to be used with care (or not at all). Flow Control is used for full-duplex transmission only, half duplex used backpressure (deliberate collision/jam signaling).

Access control is a range of protocols that are used to secure access to a physical (switch) port.

CSMA/CD is a largely obsolete media access control (MAC) protocol, used to arbitrate a shared (wired) Ethernet medium.

Go-back-n (ARQ) is an error-control method. Variants are used by the TCP transport-layer protocol and by the wireless IEEE 802.11 data link layer.

All of those are (almost) entirely different things.

Improve this answer
24
  • when we use access control throughput, efficiency means efficiency,throughput of sender Or receiver and flow control (suppose stop and wait)throughput, efficiency means throughput, efficiency of physical link?
    – S. M.
    Commented Mar 1, 2022 at 21:14
  • They have very little to do with each other.
    – Ron Trunk
    Commented Mar 1, 2022 at 21:19
  • @RonTrunk don't understand, please elaborate more.
    – S. M.
    Commented Mar 1, 2022 at 21:21
  • Throughput and efficiency have no meaning for access control.
    – Ron Trunk
    Commented Mar 1, 2022 at 21:23
  • 1
    I think the Wikipedia article explains it better than I can
    – Ron Trunk
    Commented Mar 1, 2022 at 21:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.