Network Layer

Question 1

what does an IP4 address look like

Answer 1

something like 192.168.0.100, made up of four octets

Question 2

what is an octet?

Answer 2

an 8 bit value

Question 3

what is the largest and smallest IP4 address?

Answer 3

0.0.0.0 and 255.255.255.255

Question 4

what is the range of addresses called?

Answer 4

the IP space

Question 5

IP addresses are two addresses in one. What are these two address?

Answer 5

1. host address

2. network address

Question 6

what is the five classes method?

Answer 6

IP addresses are split into 5 classes, denoted ABCDE. Each class supports a different number of networks and hosts

Question 7

Class A IP address

Answer 7

for large networks

• first octet is within 0-127, but 127 is reserved
• first octet defines the number of networks
• last three octet defines the number of hosts

Question 8

Class B IP address

Answer 8

for medium networks

• first octet is within 128-191
• first two octets define the number of networks
• last two octets define the number of hosts

Question 9

Class C IP address

Answer 9

for small networks
- first octet is within 192-223

• first three octets define the number of networks
• last octet defines the number of hosts

Question 10

what is the subnet mask?

Answer 10

used to tell us which part of an IP address is defining the number of networks and which part is defining the number of hosts

for example, the address 0.128.255.47 will have the subnet mask of 255.0.0.0 as it is a Class A IP address