A network administrator is evaluating IPv6 addressing structures for a router interface co… — Cisco CCNA

A network administrator is evaluating IPv6 addressing structures for a router interface configuration. Which two statements correctly describe IPv6 prefix properties or address compression rules?

The address $2001:\text{db8}:0000:0000:0000:0000:0000:0001$ can be validly compressed to $2001:\text{db8}::1$ .Cevap
The prefix $\text{fe80}::/10$ is designated for link-local addresses, which are automatically generated and non-routable beyond the local link.Cevap
C
The address $2001:\text{db8}::100::1$ is valid because multiple double colons ( $::$ ) are permitted if the overall address length equals 128 bits.
D
When calculating subnet host capacity for a standard $/64$ IPv6 prefix, two host addresses must be subtracted from $2^{64}$ for the network and broadcast addresses.

Cevap

The correct statements are that 2001:db8:0000:0000:0000:0000:0000:0001 can be compressed to 2001:db8::1, and that fe80::/10 is designated for link-local non-routable addresses.

Compressing consecutive zero fields into a single double colon once per address is valid according to RFC 4291 rules. Furthermore, fe80::/10 is officially designated for link-local communication and is restricted to the local layer 2 segment.

Adım Adım Çözüm

Analyze IPv6 zero compression rules according to RFC 4291.

Consecutive blocks of zeros can be replaced by double colons (::), but only ONCE per address representation to prevent ambiguity.

Compressing 2001:db8:0000:0000:0000:0000:0000:0001 into 2001:db8::1 uses the double colon once legally, while 2001:db8::100::1 violates this rule.

Evaluate reserved IPv6 prefix scopes.

The fe80::/10 block is reserved for link-local unicast addresses.

Link-local addresses are required on all IPv6-enabled interfaces, automatically configured, and never forwarded by routers outside the local link boundary.

Evaluate subnet capacity logic in IPv6 vs IPv4.

IPv6 eliminates broadcast addressing in favor of multicast, so subtracting 2 addresses for network and broadcast is unnecessary in IPv6 subnets.

All

2^{64}

host combinations in a standard /64 subnet interface ID space are available as unique host identifiers.

Anahtar Kavram

IPv6 Address Representation and Scopes

Soru

Cevap

Adım Adım Çözüm

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