Networking refresher

Question 1

Describe the groups and ranges of Classful addressing

Answer 1

• Class A range
  
  • Starts at 0.0.0.0 and ends at 127.255.255.255.
  • Split into 128 class A networks
  • Handed out to large companies
• Class B Range
  
  • Half the range of class A.
  • Starts at 128.0.0.0 and ends at 191.255.255.255.
• Class C Range
  
  • Half of range class B
  • Starts at 192.0.0.0 and ends at 223.255.255.255

Question 2

Describe the internet private IPs - RFC1918

Answer 2

• One class A network: 10.0.0.0 - 10.255.255.255
• 16 Class B networks: 172.16.0.0 - 172.31.255.255
• 256 Class C networks: 192.168.0.0 - 192.168.255.255

Question 3

What is CIDR?

Answer 3

CIDR networks are represented by the starting IP address of the network called the network address and the prefix.

Question 4

What does an IP packet contain?

Answer 4

• source IP address
• destination IP address
• data

Question 5

What does a TCP/UDP segment contain?

Answer 5

Source and destination port number + data

Question 6

How long is an IPv6 address (in bits)

Answer 6

128 bits long.

Question 7

How do you represent all IPv6 addresses?

Answer 7

::/0