A multicast router is receiving packets from a source on interface Gig0/0, but the unicast route to the source points to Gig0/1. The router is dropping the packets due to RPF failure. The network team wants to allow multicast traffic to be received on Gig0/0 without changing the unicast routing. What is the best solution?

Configure a static multicast route (mroute) to the source via Gig0/0.

Change the unicast routing metric to make Gig0/0 the preferred path.

Disable the RPF check on Gig0/0.

A service provider offers IPTV to residential customers. Each customer is in a separate VLAN for isolation, but they all subscribe to the same multicast channels. The provider wants to avoid replicating multicast streams per VLAN and wants to reduce the number of IGMP queries on each VLAN. What should you implement?

Enable IGMP snooping on each customer VLAN and rely on the querier to manage membership.

Configure MVR on the access switches and place the multicast source in a dedicated multicast VLAN.

Use PIM-SM with an RP to route multicast between VLANs.

Create a single VLAN for all customers and use ACLs to isolate traffic.

A service provider is using MVR to deliver multicast video to subscribers in different VLANs. The network team is troubleshooting an issue where some subscribers in a particular VLAN are not receiving the multicast stream. Which of the following could be the cause? (Select all that apply.)

The MVR group range does not include the multicast group address.

IGMP snooping is disabled on the switch, so MVR cannot function.

The multicast source is in the same VLAN as the receivers, and MVR is not needed.

The receiver VLAN is not configured as an MVR receiver VLAN.

The receiver's port is not a member of the multicast VLAN.

A network engineer is troubleshooting multicast routing. A router is receiving duplicate multicast packets from two different paths for the same (S,G) stream. The engineer suspects a routing loop. Which mechanism should be verified to ensure the router only accepts multicast packets on the interface that is closest to the source?

Reverse Path Forwarding (RPF) check

A multicast router is running OSPF for unicast routing and PIM-SM for multicast. You notice that multicast traffic from a source is being dropped on a particular interface even though the source is reachable via that interface. What should you check first?

Disable PIM on the interface to avoid conflicts.

Ensure the RP is reachable via a static route.

Verify that the unicast route to the source uses the same interface as the multicast packet arrives on.

Check if IGMP snooping is enabled on the VLAN.

CCIE Enterprise Infrastructure

Domain 1Objective 6

Multicast CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 3)

Part of the Network Infrastructure domain, which accounts for 30% of the CCIE-ENTERPRISE-INFRASTRUCTURE exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~15–24 in this domain), expect 3–4 from this objective — we provide 40 practice questions to prepare you well beyond it. (estimate)

40questions here

8free pages

12concepts

30%of the exam

Questions 11–15

11expert · hard
A multicast router is receiving packets from a source on interface Gig0/0, but the unicast route to the source points to Gig0/1. The router is dropping the packets due to RPF failure. The network team wants to allow multicast traffic to be received on Gig0/0 without changing the unicast routing. What is the best solution?
Select an answer first
12application · medium
A service provider offers IPTV to residential customers. Each customer is in a separate VLAN for isolation, but they all subscribe to the same multicast channels. The provider wants to avoid replicating multicast streams per VLAN and wants to reduce the number of IGMP queries on each VLAN. What should you implement?
Select an answer first
13expert · hard · select all that apply
A service provider is using MVR to deliver multicast video to subscribers in different VLANs. The network team is troubleshooting an issue where some subscribers in a particular VLAN are not receiving the multicast stream. Which of the following could be the cause? (Select all that apply.)
Select an answer first
14application · medium
A network engineer is troubleshooting multicast routing. A router is receiving duplicate multicast packets from two different paths for the same (S,G) stream. The engineer suspects a routing loop. Which mechanism should be verified to ensure the router only accepts multicast packets on the interface that is closest to the source?
Select an answer first
15application · medium
A multicast router is running OSPF for unicast routing and PIM-SM for multicast. You notice that multicast traffic from a source is being dropped on a particular interface even though the source is reachable via that interface. What should you check first?
Select an answer first

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Multicast CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 3)

Questions 11–15

A service provider is using MVR to deliver multicast video to subscribers in different VLANs. The network team is troubleshooting an issue where some subscribers in a particular VLAN are not receiving the multicast stream. Which of the following could be the cause? (Select all that apply.)

A multicast router is running OSPF for unicast routing and PIM-SM for multicast. You notice that multicast traffic from a source is being dropped on a particular interface even though the source is reachable via that interface. What should you check first?

Keep studying — Network Infrastructure