1.3 Data Transmission

Question 1

Three parts of a packet

Answer 1

Header, message, Footer

Question 2

Bit

Answer 2

Is the smallest unit of data that a computer can process and store. 1 binary digit long

Question 3

How many physical states does a bit have?

Answer 3

2

Question 4

Byte

Answer 4

Is a unit of data that is eight binary digits long

Question 5

How many physical states does a byte have?

Answer 5

256

Question 6

Serial transmission

Answer 6

Is the process of sending one bit of data after another.

Question 7

Parallel transmission

Answer 7

Is the process of sending multiple bits of data at the same time.

Question 8

What are the three main duplex modes?

Answer 8

Simplex, Half-Duplex, full Duplex

Question 9

Full duplex

Answer 9

Data can travel in both directions at the same time

Question 10

Half-Duplex

Answer 10

Data can travel in both directions but only one at a time

Question 11

Simplex

Answer 11

Data can only travel in one direction

Question 12

Multiplexing

Answer 12

Several independent data sources are combined and sent along a single route to a single destination

Question 13

Circuit switching

Answer 13

In circuit switching a path across a network is setup in advance and all packets are sent down the same route in order. The route cannot be used by any other traffic during that time.

Question 14

Disadvantages of Circuit switching

Answer 14

If a link fails the whole circuit will also fail.
After a link fails a new route will need to be planned.

Question 15

Advantages of circuit switching

Answer 15

There is no delay in receiving data.
All data received is already whole and in order.
Once a secure connection is made data is transferred at a constant rate

Question 16

Packet switching

Answer 16

Allows packets to take independent routes through the network, each packet decides on it own route, which is decided depending on which lines are available and how heavy the current load is.

Question 17

Disadvantages of Packet switching

Answer 17

Packets may not arrive in order, requiring more processing.
Not ideal for applications that require constant use, such as phone calls.
High volume networks can lose data packets during high traffic times.

Question 18

Advantages of Packet switching

Answer 18

More efficient than Circuit switching.
Does not require the use of a dedicated channel.
Reduces lost data packets because packet switching allows for resending of individual packets.

Question 19

What are the two different types of data contained within a packet?

Answer 19

Control information and Actual data

Question 20

What control information in a packet contains?

Answer 20

Source and Destination Addresses, Order Number of Packet, Control Signals, Error Control Bits.

Question 21

Where is Control information found?

Answer 21

Header and Footer

Question 22

Network Collisions

Answer 22

Is the detection of two sets of data simultaneously, the two sets of data are discarded once the collision is detected. The computers then wait a short, random, time before sending the discarded packets again.

Question 23

Routing

Answer 23

The determination of the route data packet will take ensuring that the packets are delivered as quickly as possible.

Question 24

What does an IP packet contain both of?

Answer 24

A Header and Data

Question 25

What are the five parts of a TCP/IP Packet?

Answer 25

Sender IP Address, Receiver IP Address, Check Sum, Packet Number, Packet Content

Question 26

Sender IP Address

Answer 26

Is the IP Address of the computer or device sending the data packet.

Question 27

Receiver IP Address

Answer 27

Is the IP Address of the computer or device receiving the data packet.

Question 28

Check Sum

Answer 28

Is a a value that represents the number of bits in a transmission message, it is used to determine the integrity of the message (If the message is whole).

Question 29

What are the two different Packet Numbers?

Answer 29

1. Indicates how many packets a piece of information was split into.
2. Indicates the place of the individual packet as a part of the complete information.

Question 30

Packet Content

Answer 30

This is the Content of the packet.