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
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.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