Misc. Networking

Question 1

Class A First Octet Range

Answer 1

1-126
Typically used for very large networks (millions of hosts)

Question 2

Class B First Octet Range

Answer 2

128-191
Typically used for medium to large networks (thousands of hosts)

Question 3

Class C First Octet Range

Answer 3

192-223
Typically used for small networks (up to 254 hosts)

Question 4

Class D First Octet Range

Answer 4

224-239
Used for Multicast addressing (e.g. video streaming)

Question 5

Class E First Octet Range

Answer 5

240-254
Reserved for experimental/research purposes

Question 6

127.x.x.x

Answer 6

Reserved for loopback testing, used for internal device diagnostics

Question 7

0.0.0.0

Answer 7

reserved for the default route

Question 8

Class A Default Subnet Mask

Answer 8

255.0.0.0

Question 9

Class B Default Subnet Mask

Answer 9

255.255.0.0

Question 10

Class C Default Subnet Mask

Answer 10

255.255.255.0

Question 11

Reserved Class A Private Address Range

Answer 11

10.0.0.0 - 10.255.255.255

Question 12

Reserved Class B Private Address Range

Answer 12

172.16.0.0 - 172.31.255.255

Question 13

Reserved Class C Private Address Range

Answer 13

192.168.0.0 - 192.168.255.255

Question 14

Number of Subnets Formula

Answer 14

2^n
N = bits borrowed from host

Question 15

Total Number of Addresses Formula (including host and broadcast)

Answer 15

2^32-n
N = CIDR block

Question 16

Number of Hosts per Subnet Formula

Answer 16

2^H-2
H = remaining host bits