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Cs 552 Computer Networks Quality Of Service
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| bet | 1/12 | | Sana | 26.12.2023 | | Hajmi | 492 Kb. | | #128375 |
Bog'liq qos-f05 - Richard Martin
- Credit slides by B. Nath, I. Stoica
Outline Best Effort vs. QoS - Best Effort:
- You get a link to the Internet with at most B bits/sec.
- If you don’t like it, switch to another provider.
- Quality of Service (QoS)
- We provide you some kind of guarantees for:
- I.e., network is engineered to provide some Quality beyond “Not to exceed B bits/s”
QoS’s Quest - The Holy Grail of computer networking is to design a network that has the flexibility and low cost of the Internet, yet offers the end-to-end quality-of-service guarantees of the telephone network.
- --S. Keshav
Two Styles of QoS - Worse-case
- Average-case
- Provide bandwidth/delay/jitter guarantee over many packets
- Statistical in nature
- E.g. “Soft real time”
Resource Reservation: Example - Case 1: Source attempts to connect to destination, and attempts to
- reserve 4 Mbps for the connection
- Result: Connection accepted. There is enough bandwidth
- available. Available link bandwidths updated.
- Case 2: Source attempts to connect to destination, and attempts to
- reserve 5 Mbps for the connection
- Result: Failure. There is not enough bandwidth available on
- one of the links.
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