ITPEC FE Morning April 2019 Question 33
Topic: Networks
Which of the following is the network routing and addressing mechanism that is used in IPv6 but not in IPv4?
Explanation
Anycast — one address shared by several nodes, each packet going to the nearest of them; IPv6 defines it as an address type, IPv4 does not.
The four delivery methods:
- •Unicast: one sender to one receiver; in IPv4 and IPv6
- •Multicast: one sender to every member of a group; in IPv4 (
224.) and IPv6 (0. 0. 0/4 ff00:):/8 - •Broadcast: one sender to every host on the network; in IPv4 only, since IPv6 dropped it in favour of multicast
- •Anycast: one sender to the nearest of several nodes sharing one address, as the routing measures distance; a standard address type in IPv6, while IPv4 has no anycast address type
Answer (a)
Why not others:
- •(b) Broadcast — the reverse case: it exists in IPv4 but not in IPv6
- •(c) Multicast — used in both versions
- •(d) Unicast — used in both versions; it is ordinary one-to-one delivery
Key rule: IPv6 addresses are unicast, multicast or anycast; broadcast belongs to IPv4 alone, and IPv6 does its job with multicast.
Networks · AI-written, may contain errors
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