Cisco CCNA mock exam questions sample test – Question 213

.Which of the following IP addresses are valid Class B host addresses if a default Class B mask is in use? (Choose all that apply.)

A. 10.6.8.35
B. 133.6.5.4
C. 192.168.5.9
D. 127.0.0.1
E. 190.6.5.4


Correct Answer: BE

Explanation:
The IP addresses 133.6.5.4 and 190.6.5.4 are both valid Class B addresses when a default mask is in use. The Class B default mask is 255.255.0.0 and the range of valid addresses
is 128.0.0.0-191.255.255.255.
The IP address 10.6.8.35 is a Class A address. The Class A default mask is 255.0.0.0 and the range of valid addresses is 1.0.0.0 – 127.255.255.255, with the exception of the range
127.0.0.1 – 127.255.255.255, which is reserved and cannot be assigned.
The IP address 192.168.5.9 is a Class C address. The Class C default mask is 255.255.255.0 and the range of valid addresses is 192.0.0.0 – 223.255.255.255.
The IP address 127.0.0.1 is a Class A address, but it comes from a reserved portion that cannot be assigned. The range 127.0.0.1 – 127.255.255.255 is used for diagnostics, and
although any address in the range will work as a diagnostic address, 127.0.0.1 is known as the loopback address. If you can ping this address, or any address in the 127.0.0.1 –
127.255.255.255 range, then the NIC is working and TCP/IP is installed. The Class A default mask is 255.0.0.0 and the range of valid addresses is 1.0.0.0 – 127.255.255.255, with the
exception of the range 127.0.0.1 – 127.255.255.255, which is reserved and cannot be assigned.
Objective:
Network Fundamentals
Sub-Objective:
Compare and contrast IPv4 address types
References:
Cisco > Design Tech Notes > IP Routing > IP Addressing and Subnetting for New Users > Understanding IP Addresses > Document ID: 13788