Chapter 1

Question 1

What is the internet

Answer 1

Billions of connected computers

Question 2

What do packet switches do?

Answer 2

Forwards chunks of data to their destination

Question 3

What is the network edge?

Answer 3

Where devices connect to the internet

Question 4

Network Core

Answer 4

Mesh of interconnected routers aka the internet

Question 5

What do hosts do

Answer 5

Transport packets(data) onto access networks

Question 6

What is guided media and examples

Answer 6

Physical connection links
Example: copper wire, fiber optic, coax, wired Ethernet

Question 7

What is unguided media and examples

Answer 7

Nonphysical connection links
Example: radio, wifi, bluetooth

Question 8

Packet Switching

Answer 8

A form of sending packets where the connection is shared and multiple packets can be sent

Question 9

Circuit Switching

Answer 9

A form of sending packets where the connection is not shared and only dedicated between sender and receiver

Question 10

Types of packet delays

Answer 10

Transmission Delay, Propagation Delay, Nodal Processing delay, Queuing Delay

Question 11

What is transmission delay

Answer 11

Time needed to push all the packet bits on the transmission link

Question 12

What is Propagation delay

Answer 12

Time it take for one bit to travel from one end of the link to the other

Question 13

What is Nodal Processing delay

Answer 13

Time spent processing a packet

Question 14

What is Queuing Delay

Answer 14

Time spent in a queue waiting for space on the router

Question 15

To calculate transmission Delay

Answer 15

L(Length of packet)/R(transmission time)

Question 16

To calculate Propagation Delay

Answer 16

D/s

Question 17

Internet protocol Stack in order

Answer 17

Application-support network applications
Transport-process data transfer
Network-Breaking up packets in the network and reassembling them at the receiving end (destination)
Link-helps transfer data between networks(wifi,f iber etc.)
Physical-The bits

Question 18

Malware

Answer 18

Harmful data that can corrupt a computer

Question 19

What is a virus

Answer 19

Self infection by receiving/executing object
Example: opening a email containing a virus

Question 20

Worm

Answer 20

Can activate it self and self replicate

Question 21

Spyware

Answer 21

Records keystrokes, website visited, upload info

Question 22

Denial of Service(DDOS)

Answer 22

Overwhelm request to server in an attempt to overload and shut it down