Question: Briefly describe the following terms: (a) Default queue (b) Service Level Agreement (c) Application requirement (d) Tail drop (e) Goodput (f) Protocol overhead 2. Briefly

Briefly describe the following terms: (a) Default queue (b) Service Level Agreement

(d) Tail drop

(e) Goodput

(f) Protocol overhead

2. Briefly explain the difference between the raw bit rate and the net bit rate of a connection, and outline a case when the two differ.

3. Given a WAN link of type E1 (2,048 kbps), how many KiB, likewise per second, can you transmit? Overhead not considered, kb=kilobit, KiB=Kibibyte. Submit the steps of your calculation.

4. For the four default traffic classes on a switch, a 100 Mbps interface has been configured with the following Round Robin command: wrr--queue bandwidth 3 4 2 1. How much is the effective net bit rate for: (a) Background and best-effort traffic? (b) Excellent effort and critical traffic? (c) Voice and video? (d) Internet and intranet control traffic?

5. In the risk analysis for Shoprite supermarkets in Windhoek, the cost of a supermarket till breaking down is estimated at 5,000 NS (half the value of the till). The cost of one hour loss of electricity is estimated at 100,000 NS (one hour of lost revenue for the shop). Critically comment this approach.

6. A workstation uses the HTTP protocol to download a large file from a web server. The layer?4 protocol for this file exchange is TCP. No proxy server is used. One router's queue is full when one of the web server's packets arrives. Consider the actions that follow, with respect to the HTTP protocol and the TCP protocol. (a) What action will the router take? (b) What action will the workstation take? (c) What action will the web server take? Consider two actions.

7. The following packets have arrived at a router, in the order given as "Packet #" below. They are all scheduled to exit interface Serial1, where the scheduling discipline is flow?based Fair Queueing.

Packet Source Dest. IP # IP 1 2 3 4 Cr 5 6 7 8 10.0.0.1 220.0.0.16 TCP 10.0.0.1 220.0.0.16 TCP 172.16.5.5 5.0.0.1 172.16.5.5 5.0.0.1 Protocol 172.16.5.5 5.0.0.1 10.0.0.1 UDP 10.0.0.1 220.0.0.16 TCP TCP TCP 10.0.0.1 220.0.0.16 TCP 220.0.0.16 TCP Source port 65001 65001 33635 33635 65001 33635 65001 65001 Dest. port 80 80 53 53 80 53 80 80 Bytes 202 1101 352 1582 199 802 382 1400

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