Refer to the exhibits.
Exhibit 1 -
Exhibit 2 -
Exhibit 2 shows IGMP groups on Switch-2, which runs IGMP but not PIM. Switch-1 and Switch-3 do not have IGMP or PIM enabled. Client 1 begins to forward multicasts to 239.1.1.1.
Which clients receive the multicasts?
In this scenario, Client 1 is sending multicasts to 239.1.1.1. Switch-2, which has IGMP enabled, shows that Client 3 has joined the multicast group for 239.1.1.1 on VLAN 10. Although Switch-2 supports IGMP, Switch-1 and Switch-3 do not have IGMP or PIM enabled, causing multicast traffic to be broadcast to all ports within the same VLAN. Therefore, any other clients on VLAN 10 will also receive the multicast traffic. Thus, both Client 3 and Client 4, which are on the untagged VLAN 10, will receive the multicasts, while Client 2, on VLAN 20, will not. Hence, the correct option is Client 3 and Client 4 but not Client 2.
C is correct. The traffic will essentially broadcast into the same VLAN since IGMP is not running on the edge switches.
I think correct answer is A
B, the destination switch is unmanage so all multicast traffic received is broadcasting, event if higer switch supports IGMP snooping.
B. Because PIM is not set on other L3 VLAN interfaces (i.e. VLAN 20), multicast is restricted to the source's VLAN, and is broadcast across access switch to distro switch, which recieved an IGMP join from Client 3 via access and multicast is passed on to access, but broadcast to all ports on VLAN 10 (no IGMP snooping PRESENT)
Correction..B. IGMP Snoop Constrains multicast to requesting ports. IGMP just records who requested a multicast group
C. is the answer..not B