Review Questions

1.         What information is transmitted using the link connecting the external interfaces of the computer and the peripheral device?

Instructions which control a peripheral device; device state information; input-output user data.

2.         What components does the device interface include?

The physical interface (or port) represents a connector with a set of contacts, each assigned for a specific purpose. The logical interface is a set of information messages of a predefined format that two devices or programs use to exchange data, as well as a set of rules determining the logic of this exchange.

3.         What tasks does the operating system perform when exchanging data with
peripheral devices?

4.         Which actions are typically accomplished by the peripheral device driver?

5.         Define the term ‘topology’

6.         To which type of topology is it possible to attribute the structure formed by nodes connected to one another in a triangle? 

A fully connected topology; a ring topology.

7.         To which type of topology is it possible to attribute the structure formed by nodes connected to one another in a square? A mesh topology; a ring topology.

8.         To which type of topology is it possible to attribute the structure formed by three sequentially connected nodes (the last node is not connected to the first one)?
A mesh topology; a star topology.

9.         The common bus topology is a particular case of:

A.   Fully connected

B.   Ring

C.   Star - correct


10.    Which topology is characterized by increased reliability?

A ring topology as the information can be transmitted in two directions: clockwise and counter clockwise.

11.    Which topology is the most widely used in today's LANs? Hierarchical star (tree).

12.    What are the requirements for the system of addressing?

13.    To what type can the addresses listed below be attributed?  - symbolic hierarchical address

20-34-à2-00-ñ2-27  -  numeric flat address -  numeric hierarchical address

14.    What are the differences between a flow and a stream?

15.    Which attributes can be used as a flow characteristic?

Source address, destination address, label, application’s type and some others.

16.     Describe the main approaches and criteria used when choosing a route.

17.     Which of the statements listed below can be true in some cases?


A.     Routes are fixed on switches by connecting pairs of interfaces. Yes

B.     Routes are defined by the network administrator and manually entered into a special table. Yes 

C.     The routing table is entered into the switch at the manufacturing plant. No

D.     The routing table is created automatically by the network hardware
and software. Yes

E.      Each switch has a special routing table stored on it. Yes

18.    Which of these devices — automatic telephone exchange, router, bridge, or multiplexer — can be called a switch? All of them

19.    Which methods are used for multiplexing?

Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), Wavelength Division Multiplexing (WDM).

19.    Describe the difference between shared media and multiplexing.



1.         Describe the main problems that need to be solved to ensure information exchange between any two subscribers in any type of communications network.

(1) Defining flows and respective routes;

(2) Specifying routes as parameters and table entries of network devices

(3) Flows recognition and transmitting data between interfaces of the same device

(4) Multiplexing/Demultiplexing of flows

(5) Sharing of medium

2.         Explain how the division of common traffic into several different flows allows the optimization of control over an urban transportation system.

3.         Suppose that there are several routes in the network between end nodes À and B. Consider the advantages and drawbacks of variants of data transmission between these nodes:

·         Is using all existing routes for parallel data transmission better than
transmitting all data along a single route optimal according to a
specific criterion?

·         Use several of the possible routes and share data transmission among them. What rule can be used to define the route needed to forward the next packet?