6.4-6. Self Learning Switches (c). Consider the network below with six nodes, star-connected into an Ethernet switch. Suppose that A sends a frame to A, A' replies to A, then B sends a message to B' and B' replies to B, and then A sends to B and B replies to A. In this sequence of frame transmissions, how many frames have appeared at the interface at C'? Assume that the switch's table is initially empty. C' B' 160 Sin A 2 13 A' B O None of these frames appear at C's interface, since none of the fames were addressed to C. OTwo frames appear at the C' interface. O Five frames appear at the C' interface. Six frames appear at the C' interface. O Three frames appear at the C' interface.

6.4-6. Self Learning Switches (c). Consider the network below with six nodes, star-connected into an Ethernet switch. Suppose that A sends a frame to A, A' replies to A, then B sends a message to B' and B' replies to B, and then A sends to B and B replies to A. In this sequence of frame transmissions, how many frames have appeared at the interface at C'? Assume that the switch's table is initially empty. C' B' 160 Sin A 2 13 A' B O None of these frames appear at C's interface, since none of the fames were addressed to C. OTwo frames appear at the C' interface. O Five frames appear at the C' interface. Six frames appear at the C' interface. O Three frames appear at the C' interface.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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6. Let’s consider the operation of a learning switch in the context of a network in which 6 nodes labeled A through F are star connected into a switch. Suppose that (1) B sends a frame to E, (2) E replied with a frame to B, (3) A sends a frame to B and (4) B replied with a frame to A. The switch table is initially empty. Show the state of the switch table before and after each of these events. For each of these events, identify the link(s) on which the transmitted frame will be forwarded, and briefly justify your answers.
6.4-5. Self Learning Switches (b). Consider the network below with six nodes, star-connected into an Ethernet switch. Suppose that A sends a frame to A, A' replies to A, then B sends a message to B' and B' replies to B. Suppose you are node C, and consider the frames arriving to node C's interface (whether they are destined to C or not). From what senders do these frames arrive? OA 4 B č OC DC C' B' A 3 A' B C
Let’s consider the operation of a learning switch in the context of a network in which 6 nodes labeled A through F are star connected into an Ethernet switch. Suppose that (i) B sends a frame to E, (ii) E replies with a frame to B, (iii) A sends a frame to B, (iv) B replies with a frame to A. The switch table is initially empty. Show the state of the switch table before and after each of these events. For each of these events, identify the link(s) on which the transmitted frame will be forwarded, and briefly justify your answers.
5.04-4. Bellman Ford Algorithm - a change in DV (1, part 4). Consider the network below, and suppose that at t=0, the link between nodes b and c goes down. And so at t=0, node b recomputes its distance vector (DV) and sends out its new DV (as needed). At t=1 this new DV is received at b's neighbors, who then perform their calculation and send out their new DVs (as needed); these new DVs arrive at their neighbors at t=2, and so on. What is the last time in this network at which a DV calculation will take place as a result of the link change at t=0? U O O o 1 1 3 2 at t=0 the link (with a cost of 1) between nodes b and c goes down A 8 1 6 compute 1 1 1 1 an essentially infinite amount of time; this is the count-to-infinity problem 1 Second
Consider the operation of a learning switch in the context of a network in which 6 nodes labeled A through F are star connected into an Ethernet switch. Suppose that (i) A sends a frame to C, (ii) C replies with a frame to A, (iii) B sends a frame to A, (iv) A replies with a frame to B. The switch table is initially empty. Show the state of the switch table before and after each of these events. For each of these events, identify the link(s) on which the transmitted frame will be forwarded, and briefly justify your answers.
Let's consider the operation of a learning switch in the context of a network in which 6 nodes labeled A through Fare star connected into an Ethernet switch. Suppose that (i) B sends a frame to E, (ii) E replies with a frame to B, (i) A sends a frame to B, (iv) B replies with a frame to A. The switch table is initially empty. Show the state of the switch table before and after each of these events. For each of these events, identify the link(s) on which the transmitted frame will be forwarded, and briefly justify your answers.
6.4-4. Self Learning Switches (a). Consider the network below with six nodes, star-connected into an Ethernet switch. Suppose that A sends a frame to A, A' replies to A, then B sends a message to B' and B' replies to B. Enter the values that are present in the switch's forwarding table after B'-to-B frame is sent and received. Assumed that the table is initially empty and that entries are added to the table sequentially. Answer the questions below from the pulldown list. C' B' S A 3 A' B What is the first entry added to the table? [Choose ] [Choose ] B,2 What is the second entry added to the table? C,6 What is the third entry added to the table? What is the fourth entry added to the table? C,3 A,4 B₁,5 A,1 [Choose ] <
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Exercise 8.17. In a version of the network reliability problem, we want to know how many different ways there are to send a message from its source to its destination. Hereto, we represent the network by a directed graph G = (V, A), the source by s and the destination by t. In this exercise, we consider two simplified versions of this problem.
5.04-4. Bellman Ford Algorithm - a change in DV (1, part 4). Consider the network below, and suppose that at t=0, the link between nodes b and c goes down. And so at t=0, node b recomputes its distance vector (DV) and sends out its new DV (as needed). At t=1 this new DV is received at b's neighbors, who then perform their calculation and send out their new DVs (as needed); these new DVs arrive at their neighbors at t=2, and so on. What is the last time in this network at which a DV calculation will take place as a result of the link change at t=0? a. 1 1 at t=0 the link (with a cost of 1) between nodes b and c goes down 2 8 1 6 b- compute 1 e 1 -h- 1 1 an essentially infinite amount of time; this is the count-to-infinity problem 1 Not quote. This answer is incorrect.
Suppose you were allowed to add a single edge to the given network, connecting one of nodes c or d to any one node that it is not currently connected to. Could you do this in such a way that now behavior A, starting from S and spreading with a threshold of 2/5, would reach all nodes? Give a brief explanation for your answer
Consider the paths in the image below. There are many paths through this network – which one is the longest?