What is the purpose of the robustness variable in IGMP?

It sets the maximum number of groups a router can support.

It controls the time between general queries.

It determines the priority of the querier election.

It determines the number of times queries and reports are retransmitted to account for packet loss.

A Layer 2 switch is running IGMP snooping. A host sends an IGMPv2 leave message for group 239.1.1.1. What does the switch do with this message?

The switch forwards the leave message only to the multicast router port.

The switch removes the group from its forwarding table immediately.

The switch floods the leave message to all ports.

The switch ignores the leave message.

A service provider has a multi-access Ethernet segment with three routers (R1, R2, R3) and several IGMPv2 hosts. R1 has the lowest IP address on the subnet. During troubleshooting, you notice that R2 is sending periodic general queries, but R1 is also sending them. The multicast streams are working, but you want to ensure only one router is the querier. What is the most likely reason R1 is also sending queries?

R1 has IGMPv3 enabled while R2 is running IGMPv2.

R1 is not receiving R2's queries due to a Layer 2 issue, so it believes it is the querier.

R1 has a lower IGMP query interval configured than R2.

R1 has a higher IP address than R2 and is therefore the querier.

Juniper NetworksCertified Professional, Service Provider Routing and Switching (JNCIP-SP)

Domain 5Objective 4

IGMP JN0-664 Practice Questions (Page 1)

Part of the IP Multicast domain, which makes up ~18% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–11 in this domain), expect 1–1 from this objective — we provide 21 practice questions to prepare you well beyond it. (estimate)

21questions here

5free pages

9concepts

Questions 1–5

1foundation · easy
What is the purpose of the robustness variable in IGMP?
Select an answer first
2application · medium
A Layer 2 switch is running IGMP snooping. A host sends an IGMPv2 leave message for group 239.1.1.1. What does the switch do with this message?
Select an answer first
3application · easy
A Juniper router is configured with IGMPv2 on interface ge-0/0/1. You need to verify which hosts have joined group 239.1.1.1. Which command would you use?
Select an answer first
4application · medium
A service provider has a multi-access Ethernet segment with three routers (R1, R2, R3) and several IGMPv2 hosts. R1 has the lowest IP address on the subnet. During troubleshooting, you notice that R2 is sending periodic general queries, but R1 is also sending them. The multicast streams are working, but you want to ensure only one router is the querier. What is the most likely reason R1 is also sending queries?
Select an answer first
5foundation · easy
In IGMPv1, which message type is used by a host to join a multicast group?
Select an answer first

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IGMP JN0-664 Practice Questions (Page 1)

Questions 1–5

What is the purpose of the robustness variable in IGMP?

A Layer 2 switch is running IGMP snooping. A host sends an IGMPv2 leave message for group 239.1.1.1. What does the switch do with this message?

A Juniper router is configured with IGMPv2 on interface ge-0/0/1. You need to verify which hosts have joined group 239.1.1.1. Which command would you use?

In IGMPv1, which message type is used by a host to join a multicast group?

Keep studying — IP Multicast