Chapter 9 Communications and Networking

Question 1

What does bus topology look like

Answer 1

a central cable which terminates at each end with various devices attached to it

Question 2

What does star topology look like?

Answer 2

A central switch which all the devices are connected to

Question 3

Positives of star topology

Answer 3

High connection speed
Fewer collisions occur

Question 4

Positives of Bus topology

Answer 4

Cheaper
Easier to add new devices

Question 5

Negatives of bus topology

Answer 5

Collisions more likely
If bus cable breaks whole network fails
Less secure

Question 6

Negatives of star topology

Answer 6

Expensive cabling costs
If central device fails, the whole network fails

Question 7

What does a Network Interface Card (NIC) do?

Answer 7

It contains a MAC address used to uniquely identify the device

Question 8

What does a switch do

Answer 8

directs packets of data to the correct recipient (using their mac address)

Question 9

What hardware is needed to connect devices to a wired network

Answer 9

Network Interface Card (NIC)
Switch

Question 10

What hardware is needed to connect devices to a wireless network?

Answer 10

Wireless Network Interface Card
Wireless access point

Question 11

Which is more secure wired or wireless networks?

Answer 11

Wired

Question 12

What are 3 ways you can improve your wireless security

Answer 12

Hide the SSID
Use strong encryption
Use Mac Address “Allow Listing”

Question 13

What is data transmission?

Answer 13

The movement of data from one place to another.

Question 14

What is Serial data transmission

Answer 14

single bits are sent along one wire one bit at a time

Question 15

What is parallel data transmission?

Answer 15

Multiple bits are sent down several wires simultaneously

Question 16

Which is faster serial or parallel data transmission?

Answer 16

Parallel

Question 17

Which is cheaper serial or parallel data transmission?

Answer 17

Serial

Question 18

Which can experience cross talking, serial or parallel data transmission?

Answer 18

Parallel

Question 19

Which is more suited to longer distances serial or parallel data transmission?

Answer 19

Serial

Question 20

How do you calculate the bit rate?

Answer 20

Baud rate x Bits per signal

Question 21

WHat is bit rate?

Answer 21

The number of bits transported per second

Question 22

What is baud rate?

Answer 22

The rate at which signal on a wire may change

Question 23

What is band width

Answer 23

The range of frequencies that data can be transmitted, measured in hertz

Question 24

What is latency?

Answer 24

The delay between data being sent and recieved

Question 25

When is synchrous data transmission used?

Answer 25

When it is devices sharing the same system clock communicating

Question 26

When is asynchronous data transmission used?

Answer 26

When the 2 devices don't share the same clock

Question 27

How does asynchronous data transmission work?

Answer 27

The 2 devices get temporarily synchronized A start bit starts the receiver clock ticking to synchronize with the transmitter clock A stop bit provides time for the receiver to process the received data and allows next start bit to be recognized.