Answered: After how many time ticks, will L's…

After how many time ticks, will L's distance vector (i.e., its DV that it exchanges with its neighbor) reflect this change in topology?

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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Concept explainers

Network transmission cabling

A network is a collection of devices connected by communication links. A device can be a computer or any instrument capable of sending and receiving data or information formed by other nodes toward the network. A channel that connects people or things is known as a network. It sends the data from one place to another. It is the basic concept of a computer, network, and data communications.

Question

After how many time ticks, will L's distance vector (i.e., its DV that it exchanges with its neighbor) reflect this change in topology?

**5.06-4. Bellman Ford Algorithm (3, part 4).** Consider again the same network shown above and again focus on node L. All links have a cost of 1.

_Suppose that at time t, the distance vector calculations have completed in all nodes. The link between nodes S and N then goes down at time t. Assuming that all nodes exchange distance vectors (DVs) at times t+1, t+2, (i.e., a clock tick is one time unit)... immediately recompute their DVs and if they transmit a new DV do so at the next integer time value._

_After how many time ticks, will L's distance vector (i.e., its DV that it exchanges with its neighbor) reflect this change in topology?_

- ○ After 1 time tick.
- ○ After 2 time ticks.
- ○ After 8 time ticks - roughly the diameter of the network.
- ○ Four time ticks.
- ○ L's distance vector will not change so it will not send out a change in DV message - i.e., the algorithm will not iterate.

**Diagram Explanation:**
The diagram shows a 5x5 grid network with nodes labeled A through Y. Each node is connected to its immediate neighbors, forming a lattice structure. All links have the same cost. Focus is given to node L, with emphasis on the change in topology caused by the link failure between nodes S and N.

Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.

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