Examkin

Soru

Zorluk: OrtaIPv6 Addressing Concepts and Header Structure

A network administrator is analyzing packet captures and system configurations during an enterprise IPv6 migration. Which of the following statements correctly describe IPv6 header structure features or address representation rules? (Select TWO).

  1. The IPv6 base header has a fixed length of 40 bytes, and optional payload processing parameters are handled via chained Extension Headers.Cevap
  2. The Hop Limit field in the IPv6 base header performs the same loop-prevention role as the Time to Live (TTL) field in IPv4, decrementing at each router hop.Cevap
  3. C
    The shortened IPv6 representation 2001:db8::100::1 is valid because both compressed zero blocks contain equal numbers of contiguous zero hex fields.
  4. D
    The Next Header field in the IPv6 header specifies the OSI Layer 2 frame size allocated for transmission across adjacent switches.

Cevap

The correct statements are that the IPv6 base header is a fixed 40 bytes using extension header chaining, and the Hop Limit field replaces the IPv4 Time to Live (TTL) field for loop suppression.
The IPv6 base header is standardized to a fixed 40-byte length to allow fast hardware processing; extra options are appended via Extension Headers referenced by the Next Header field. Additionally, the Hop Limit field serves the exact functional purpose as IPv4 Time to Live (TTL) to prevent routing loops.

Adım Adım Çözüm

1
Evaluate IPv6 base header design characteristics
Confirm that the base IPv6 header is fixed at 40 bytes and utilizes the Next Header field to chain optional Extension Headers.
Fixed header size reduces processing overhead on routers compared to IPv4's variable header length.
2
Evaluate the function of the Hop Limit field
Confirm that Hop Limit functions identically to IPv4 TTL by decrementing at each Layer 3 device.
Packets are dropped when Hop Limit reaches zero to prevent endless loop propagation.
3
Analyze address compression rules and field functions in wrong options
Identify that using multiple double-colons in an IPv6 address breaks parsing rules, and Next Header indicates Layer 4 protocols or Extension Headers rather than Layer 2 frame sizes.
RFC 5952 forbids multiple '::' occurrences due to address ambiguity.

Anahtar Kavram

IPv6 Base Header Fields and Address Representation Rules
Tahmini Süre:1m 30s
Bu soruyu puanla

Konular

IPv6 Addressing Concepts and Header Structure

Bu konudan daha fazla soru