Reiko’s workstation cannot connect to the network. She checks the network configuration and
finds the IP address is set to 127.45.23.6. Why is this a problem?

A.
This address is reserved by the ICANN for private networks

B.
This address is reserved for directed broadcasts

C.
This address is reserved as the Loopback address

D.
This address does not conform to the IPv4 standard

Explanation:
IP addresses that begin with 127 (have the first octet as 127) are reserved for the loopback
addresses.
Incorrect Answers:
A: The address ranges that are reserved by ICANN for private networks are:10.0.0.0-10.255.255.255172.16.0.0-172.31.255.255192.168.0.0-192.168.255.255
B: Usually we would need to see the subnet mask to determine if this is a broadcast address. We
can easily see without the subnet mask that it can’t be. The last nibble (half of a octet) would be
0b’0110′. A directed broadcast, as an all ones broadcast, would have the host as all ones. Since
the last bit of the address is a zero, this could not be an all ones broadast.
D: The address does conform to Ipv4 standards. However, if the address was not the loopback
address, then we would need to see the subnet mask to see if the address was valid as a node
address.