ITPEC FE Morning April 2019 Question 33
Source exam: ITPEC FE Morning April 2019Topic: Networks
ITPEC FE Morning April 2019 — Question 33 of 80
Anycast in IPv6 — a routing mechanism defined in IPv6 but not in IPv4.
IPv6 defines three address types: unicast, multicast, and anycast.
- •Unicast — one-to-one (exists in both IPv4 and IPv6)
- •Multicast — one-to-group (exists in both IPv4 and IPv6)
- •Anycast — one-to-nearest; a packet is delivered to the closest node sharing the same address (defined as a standard address type only in IPv6)
- •Broadcast — one-to-all; exists in IPv4 but removed in IPv6 (replaced by multicast)
Why not others:
- (b) Broadcast — exists in IPv4, removed in IPv6
- (c) Multicast — present in both IPv4 and IPv6
- (d) Unicast — present in both IPv4 and IPv6
Key rule: IPv6 has no broadcast. Anycast is the new standard address type introduced in IPv6 (RFC 4291).
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