Ccna certification Practice Tests

 102.  B.  The IP address 172.23.23.2 is a Class B address. All of the other options are incorrect.

 103.  A.  The default subnet mask of a Class A address is 255.0.0.0. The default subnet mask 

of a Class B address is 255.255.0.0. The default subnet mask of a Class C address is 

255.255.255.0. The mask 255.255.255.255 is reserved to define a specific IP address and 

is not part of classful addressing.

 104.  C.  The multicast range begins with 224 and ends with 239 in the first octet. Therefore, 

only the IP address 238.20.80.4 is correct. All of the other options are incorrect.

 105.  B.  The IP address 135.20.255.255 is a Class B broadcast address. It is not a Class A 

address, nor is it the default gateway address. The default mask of a Class B address is 

255.255.0.0.

---