2.2 Layer 2 multicast _ IGMP

Which protocol is the encapsulating protocol for mtrace packets?

"mtrace" is a diagnostic tool to trace the multicast path from a specified source to a destination for a multicast group. It runs over *IGMP* protocol.

Refer to the exhibit. Which three statements about the output are true? sw#sh ip igmp snooping mrouter vlan: 10 ports: Gi2/0/1(dynamic), Router vlan: 20 Gi2/0/1(dynamic), Router

- An mrouter port can be learned by receiving a PIM hello packet (not multicast data stream) from a multicast router. - This switch is configured as a multicast router. - Gi2/0/1 is a trunk link that connects to a multicast router.

Which technology can be used on the switch to enable host A to receive multicast packets for 239.2.2.2 but prevent host B from receiving them? MAP= Host A and B both connected to same switch. The switch connected to a router. IGMP join for 239.2.2.2 sent from HostA.

- IGMP snooping; allows a network switch to listen in on the IGMP conversation between hosts and routers. By listening to these conversations the switch maintains a map of which links need which IP multicast streams. Multicasts may be filtered from the links which do not need them and thus controls which ports receive specific multicast traffic.

Multicast (receivers/or senders?) send IGMP messages to ... to receive traffic for specific multicast groups.

- Multicast receivers send IGMP messages to signal their interest to receive traffic for specific multicast groups.

Which two statements about IGMP filters that are operating in access mode are true? A. They can be applied on the access port only. B. A filter that is applied on the SVI must use the same settings as a filter that is applied to the trunk port. C. The port filter is always checked first. D. They can be applied on both the SVI and the access port.

- The port filter is always checked first. - They can be applied on both the SVI and the access port.

the multicast protocol default time interval. 30 s 60 s 120 s

30 s (PIMv1 query interval) 60 s (PIMv1,v2,v3 query interval) 120 s (PIMv2 querier timeout)

What is the destination address of an IGMPv2 general membership query? A. 224.0.0.1 B. 224.0.1.1 C. 224.0.0.2 D. the multicast group address

A General Query is addressed to the all-systems multicast group (224.0.0.1)

IGMP Filter Precedence in Access mode.

In access mode, filters can be configured on both the port and the SVI. When an IGMP packet is received on a port in access mode, the port filter is checked first. If the port filter exists, it is applied and the SVI filter is ignored. If no per-port filter exists, the SVI filter is used.

IGMPv2 timers? Last Member Quesry Interval , Query Response Interval , Query Interval , Other Querier Present Interval , Group Membership Interval , Version1 Router Present Timeout

Last Member Quesry Interval = 1s Query Response Interval = 10s Query Interval = 60s Other Querier Present Interval = 255s Group Membership Interval = 260s Version1 Router Present Timeout =400s

Which three protocols support SSM? A. IGMPv2 B. IGMPv3 C. IGMP v3lite D. URD E. CGMP F. IGMPv1

SSM supported on: IGMPv3 IGMP v3lite URD

Refer to the exhibit. R1, R2, and R3 in different satellite offices of the same organization, which sources multicast video streams from R1. R3 frequently receives video streams intended for R2. These streams saturate the available bandwidth of R3. Which configuration change can alleviate the congestion on R3? MAP= 3 routers connected to 3 switches. All switches are in one cloud.

Enable IGMP snooping on all switches that connect to R1,R2 and R3. Note: PIM snooping here is not helps since the routers here role as hosts and all connected to same layer2 lan. PIM is works between several routers connected with several switches to each other and traffic can manage between switches interfaces.

IGMP Filter Precedence in Trunk mode.

With ports in trunk mode, a filter can be configured for an SVI corresponding to one of the VLANs on the trunk port, another filter configured on the trunk port itself, and a third filter configured on one of the Layer 2 VLANs passing through the trunk. When an IGMP packet is received, the trunk-per-VLAN specific filter will be checked first.

Which enhancement does IGMP version 3 offer over IGMP version 2? A. support for Source Specific Multicast B. a mechanism to decrease leave latency C. authentication of multicast streams D. backward compatibility with IGMP version 1

support for SSM!