210-255 Question #12: Real Exam Question with Answer & Explanation

The correct answer is A: The public IP address of cisco.com is 2001:420:1101:1::a.. The ping output shows cisco.com resolved and responded from the IPv6 address 2001:420:1101:1::a, confirming it as the site's public IP.

Question

Refer to the exhibit. What can be determined from this ping result?

Exhibit

Options

AThe public IP address of cisco.com is 2001:420:1101:1::a.
BThe Cisco.com website is down.
CThe Cisco.com website is responding with an internal IP.
DThe public IP address of cisco.com is an IPv4 address.

Explanation

The ping output shows cisco.com resolved and responded from the IPv6 address 2001:420:1101:1::a, confirming it as the site's public IP.

Common mistakes.

B. The ping is receiving successful replies, which indicates cisco.com is reachable and operational, not down.
C. The address 2001:420:1101:1::a is a globally routable public IPv6 address, not an internal or private address - private IPv6 addresses use the fc00::/7 prefix.
D. The address 2001:420:1101:1::a uses IPv6 colon-hexadecimal notation and is clearly not the dotted-decimal format used by IPv4 addresses.

Concept tested. IPv6 public address identification from ping output

Reference. https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml

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