Match each IPv6 address or prefix on the left with its corresponding functional characteri… — Cisco CCNA

Match each IPv6 address or prefix on the left with its corresponding functional characteristic or property on the right.

$2001:\text{db8}:\text{abc}:1200::/56$ A global unicast prefix block that allows exactly $256$ subnets of $/64$ length
$fd00:\text{db8}:\text{abc}:1200::/64$ A unique local address (ULA) prefix in the $fc00::/7$ block intended for non-routable internal site communication
fe80::200:5eff:fe00:5301A link-local unicast address dynamically created using modified EUI-64 format from the burn-in MAC address 00:00:5e:00:53:01
ff02::1:ff00:5301A solicited-node multicast address derived from the lower 24 bits of an interface ID for Neighbor Discovery

Answer

The correct pairings are: 2001:db8:abc:1200::/56 matches the global unicast prefix providing 256 subnets of /64 length; fd00:db8:abc:1200::/64 matches the unique local address prefix; fe80::200:5eff:fe00:5301 matches the link-local address created using EUI-64 from MAC 00:00:5e:00:53:01; and ff02::1:ff00:5301 matches the solicited-node multicast address.

Each IPv6 address and prefix matches its exact functional specification: 2001:db8:abc:1200::/56 yields 256 subnets of /64 size; fd00::/8 addresses are Unique Local Addresses; fe80::200:5eff:fe00:5301 correctly applies the 7th-bit flip and FFFE insertion to MAC 00:00:5e:00:53:01; and ff02::1:ff00:5301 uses the exact low 24 bits of the interface ID appended to the solicited-node multicast prefix.

Step-by-Step Solution

Analyze the prefix length calculation for 2001:db8:abc:1200::/56

Difference between /64 and /56 is 8 bits (

64 - 56 = 8

2^8 = 256

subnets.

Standard IPv6 subnets are designated at the /64 boundary.

Identify the IPv6 scope for fd00:db8:abc:1200::/64

Prefix starting with fd00::/8 is within fc00::/7.

fc00::/7 defines Unique Local Addresses (ULA), equivalent to IPv4 private addresses.

Perform Modified EUI-64 conversion on MAC 00:00:5e:00:53:01

First byte 0x00 binary (00000000) flipped 7th bit becomes 0x02 (00000010). Insert FFFE in center (0000:5E -> 0000:5EFF:FE00:5301). Prepend fe80:: prefix -> fe80::200:5eff:fe00:5301.

Modified EUI-64 flips the 7th bit (Universal/Local) and inserts FFFE between OUI and NIC specific bytes.

Derive the solicited-node multicast address for interface ID 0200:5eff:fe00:5301

Extract last 24 bits (00:5301) and append to prefix ff02::1:ff00:0/104 -> ff02::1:ff00:5301.

Solicited-node multicast addresses always start with ff02::1:ff00:0/104 and take the lowest 24 bits of the unicast address.

Key Concept

IPv6 Address Representation, Subnetting, Scopes, and EUI-64 / Solicited-Node Multicast Generation

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

Topics

More questions from this topic