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Zorluk: OrtaIPv6 Addressing and Deployment

A network engineer is configuring Neighbor Discovery protocol settings on an enterprise VLAN. A server interface has been assigned the IPv6 global unicast address 2001:db8:1111:2222:4567:89ab:cdef:12342001:\text{db8}:1111:2222:4567:89\text{ab}:\text{cdef}:1234. Which solicited-node multicast address will the server interface automatically join to enable Layer 2 address resolution?

  1. ff02::1:ffef:1234Cevap
  2. B
    ff02::2:ffef:1234
  3. C
    fe80::1:ffef:1234
  4. D
    ff02::1:ffcd:ef12

Cevap

The server interface will automatically join the solicited-node multicast address ff02::1:ffef:1234.
The correct answer combines the mandatory solicited-node multicast prefix ff02::1:ff00:0/104 with the last 24 bits (6 hexadecimal characters) of the server's unicast address cdef:1234, yielding ff02::1:ffef:1234.

Adım Adım Çözüm

1
Identify the standard IPv6 solicited-node multicast prefix
The predefined prefix for all solicited-node multicast addresses is ff02::1:ff00:0/104ff02::1:ff00:0/104.
Solicited-node multicast addresses are required by Neighbor Discovery Protocol (NDP) to replace broadcast ARP in IPv6 networks.
2
Extract the low-order 24 bits from the assigned IPv6 address
The final 32 bits of 2001:db8:1111:2222:4567:89ab:cdef:12342001:\text{db8}:1111:2222:4567:89\text{ab}:\text{cdef}:1234 are cdef:1234\text{cdef}:1234. Taking the last 24 bits (6 hex digits) yields ef1234ef1234.
Solicited-node address construction strictly appends the last 24 bits of the host unicast/anycast address to the prefix.
3
Combine the prefix and extracted 24 bits
Appending ef1234ef1234 to ff02::1:ff00:0/104ff02::1:ff00:0/104 gives ff02::1:ffef:1234ff02::1:ffef:1234.
This creates a unique multicast group mapped to the specific network interface for efficient Neighbor Solicitation processing.

Anahtar Kavram

IPv6 Solicited-Node Multicast Address Generation
Tahmini Süre:1m 30s
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Konular

IPv6 Addressing and Deployment

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