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Zorluk: KolayIPv6 Addressing Concepts and Header Structure

A network administrator is documenting IPv6 address assignments across corporate router interfaces. Which of the following IPv6 addresses represents an INVALID shorthand notation because it violates IPv6 address compression rules?

  1. A
    2001:db8:0:0:1::1
  2. 2001:db8::100:1::5Cevap
  3. C
    fe80::1
  4. D
    ::1

Cevap

The address '2001:db8::100:1::5' is invalid because it contains two instances of the double colon (::).
The notation '2001:db8::100:1::5' is invalid because standard IPv6 compression rules prohibit using the double colon (::) more than once within a single address. Using it twice makes it mathematically impossible to determine how many zero fields belong to each double colon when expanding the address back to its full 128-bit form.

Adım Adım Çözüm

1
Examine the rules for IPv6 shorthand address compression according to standard networking specifications (RFC 5952).
Identify that leading zeroes in any 16-bit block can be omitted, and contiguous blocks of all zeroes can be replaced by a double colon (::).
Understanding IPv6 syntax rules is essential for identifying valid and invalid representations.
2
Evaluate the restriction on using the double colon (::) operator.
Confirm that a double colon (::) can only appear ONCE in any single IPv6 address.
If used multiple times, routers and software cannot determine how many 16-bit zero blocks each double colon represents, making the address ambiguous.
3
Analyze each given option against the single double-colon rule.
The string '2001:db8::100:1::5' contains two double colons, rendering it syntactically invalid.
Multiple double colons prevent reliable expansion to the full 128-bit IPv6 address.

Anahtar Kavram

IPv6 Address Compression Syntax Rules
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Konular

IPv6 Addressing Concepts and Header Structure

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