Multicast CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A campus network has a multicast video surveillance system. The switches are Layer 2 only and do not support IGMP snooping. The security team complains that multicast video traffic is consuming bandwidth on all access ports, even those with no cameras or viewers. You need to reduce unnecessary multicast flooding without changing the VLAN design. What should you do?

   • AEnable IGMP snooping on all switches and configure the querier on the VLANs.
   • BImplement MVR to isolate multicast traffic to a dedicated VLAN.
   • CConfigure static MAC address entries for the multicast group on each switch.
   • DDisable unknown multicast flooding on all access ports.
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   Two routers on the same LAN segment are both receiving multicast traffic for the same group from the same source. Both routers are forwarding the traffic to their respective downstream networks, causing duplicate packets. What mechanism should resolve this duplication?

   • APIM assert
   • BRPF check
   • CIGMP snooping
   • DMVR
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A network engineer is configuring a Layer 2 switch for multicast. The switch does not have IGMP snooping enabled. A multicast source sends traffic to group 239.1.1.1. How will the switch forward these frames?

   • AFlood the frames to all ports in the VLAN except the source port.
   • BForward the frames only to ports that have IGMP members.
   • CSend the frames to the router for routing.
   • DDrop the frames because the destination MAC is a multicast address.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A network administrator is planning to deploy multicast routing in a network that uses EIGRP for unicast routing. The administrator wants to use PIM for multicast. Which statement is true about PIM's interaction with the unicast routing protocol?

   • APIM is independent of the unicast routing protocol and uses the unicast RIB for RPF checks.
   • BPIM uses its own routing table and does not consult the unicast RIB.
   • CPIM must be configured with the same autonomous system number as EIGRP.
   • DPIM requires EIGRP to be configured with multicast extensions.
   Reveal Solution Discussion Select an answer first
6. 5expert · hard

   A multicast network uses PIM-SM with a redundant RP. The network has two paths to the source: a primary path with a higher OSPF metric and a backup path with a lower metric. The source is sending traffic, but the last-hop router is not receiving it. The RPF check is failing on the interface where the traffic arrives. What is the most likely cause?

   • AThe source is sending to a group that is not in the PIM-SM group range.
   • BIGMP snooping is disabled on the access switch.
   • CThe RP is not reachable via the unicast routing table.
   • DThe unicast route to the source points to the backup interface, but the multicast traffic arrives on the primary interface.
   Reveal Solution Discussion Select an answer first