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How does a multicast network work?
Using multicast, a source can send a single copy of data to a single multicast address, which is then distributed to an entire group of recipients. A source host sends data to a multicast group by simply setting the destination IP address of the datagram to be the multicast group address.
How is multicasting implemented in Internet?
Hosts can join to multicast groups and receive datagrams sent to group addresses. The most important part of host IP multicast support implementation is Internet Group Management Protocol (IGMP) [1] [15]. Logically IGMP situates in IP layer along with ICMP (Internet Control Message Protocol).
What is the purpose of IGMP snooping?
Benefits of IGMP Snooping Optimized bandwidth utilization —IGMP snooping’s main benefit is to reduce flooding of packets. The device selectively forwards IPv4 multicast data to a list of ports that want to receive the data instead of flooding it to all ports in a VLAN.
Is it possible to multicast across the Internet?
As an end-user, you cannot multicast across the Internet, unless using a tunnel. As a larger organization, like a video provider or an ISP, it is certainly possible to forward multicast packets across their domain boundary (i.e. across an Internet).
Which is an example of a multicast address?
Multicast address. A multicast address is a logical identifier for a group of hosts in a computer network that are available to process datagrams or frames intended to be multicast for a designated network service. Multicast addressing can be used in the link layer (layer 2 in the OSI model ), such as Ethernet multicast,…
How is IP multicasting different from IP broadcasting?
Multicasting is different from IP broadcasting as: Broadcasting uses a single IP address. Host bits set to all 1’s. There are a range of multicast addresses Broadcast messages are not sent through routers but multicast messages are. A host must be configured to receive multicast messages.
How are multicast packets forwarded on the Internet?
On the Internet multicast packets need to be forwarded by routers. A router will determine if any of the hosts on a locally attached network are configured to receive multicast datagrams using IGMP ( Internet Group Management Protocol ).