What is the difference between unicast, anycast, broadcast and multicast traffic?

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| TYPE      | ASSOCIATIONS     | SCOPE           | EXAMPLE |
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| Unicast   | 1 to 1           | Whole network   | HTTP    | 
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| Broadcast | 1 to Many        | Subnet          | ARP     |
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| Multicast | One/Many to Many | Defined horizon | SLP     |
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| Anycast   | Many to Few      | Whole network   | 6to4    |
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Unicast

• TCP by definition is unicast

Broadcast

• same subnet
• layer 2 - ethernet, layer3 - IPv4

Multicast

• cross subnets
• UDP
• Inetrnet rougter do not pass multicast traffic
• layer3 of IPv4, IPv6

Anycast

• 6to4 IPv6 transition
• NTP services, root DNS service
• horizontal scaling