Comptia Security Plus Mock Test Q117

A system administrator attempts to ping a hostname and the response is 2001:4860:0:2001::68. Which of the following replies has the administrator received?

A. The loopback address
B. The local MAC address
C. IPv4 address
D. IPv6 address

Correct Answer: D
Section: Network Security

Explanation:
IPv6 addresses are 128-bits in length. An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:). The hexadecimal digits are case-insensitive, but IETF recommendations suggest the use of lower case letters. The full representation of eight 4-digit groups may be simplified by several techniques, eliminating parts of the representation.

Incorrect Answers:
A: The name localhost is reserved for loopback purposes. An IPv4 or IPv6 address query for the name localhost must always resolve to the respective loopback address, which is
specified in a separate standard.

B: MAC addresses are 48-bits in length.

C: IPv4 uses 32-bit addresses.

References:
http://en.wikipedia.org/wiki/IPv6_address
http://en.wikipedia.org/wiki/Localhost
http://en.wikipedia.org/wiki/MAC_address
http://en.wikipedia.org/wiki/IPv4#Addressing