IP Multicast

A network engineer is troubleshooting multicast video distribution across an enterprise campus. The multicast source is connected to a switch that is the PIM Designated Router (DR) on a multi-access segment. Receivers in a different VLAN report that they are not receiving the multicast stream, although the DR shows the correct (S,G) entry. The engineer checks the RPF neighbor for the source and notices that the unicast route to the source points to a different interface than the one where the multicast stream is received. What is the most likely cause of the issue?

A network engineer is deploying IP multicast in an OSPF-based enterprise network. The network uses PIM sparse mode with a static RP. The engineer notices that multicast traffic from a source to a group is not reaching receivers in a remote subnet, even though the RP is reachable and the receivers have sent IGMP joins. The engineer checks the multicast routing table on the last-hop router and sees that the (S,G) entry is present, but the outgoing interface list (OIL) is empty. What is the most likely reason for the empty OIL?

An engineer is configuring multicast on a Cisco router running IOS-XE. The network uses PIM sparse mode with a static RP at 10.1.1.1. The engineer enters the command 'ip pim rp-address 10.1.1.1' but multicast traffic is not being forwarded. Upon verification, the engineer sees that the RP is reachable via OSPF, but the 'show ip pim rp mapping' command does not list any RP for the group. What is the most likely cause?

A network engineer is troubleshooting multicast connectivity in a large enterprise. The network uses PIM sparse mode with Auto-RP. The engineer notices that some routers are not receiving the RP mapping for a particular group. The engineer checks the Auto-RP mapping agent and sees that it is sending RP announcements, but the routers that are missing the mapping are not in the same PIM domain. What is the most likely reason?

An engineer is configuring multicast on a Cisco switch running IOS. The switch is acting as the IGMP querier for a VLAN. The engineer notices that multicast traffic is being flooded to all ports in the VLAN, even though only a few receivers have joined the group. The engineer checks the IGMP snooping configuration and sees that IGMP snooping is enabled globally and on the VLAN. What is the most likely cause of the flooding?

A network engineer is configuring PIM sparse mode in a network that uses a Bootstrap Router (BSR) for RP discovery. The engineer has configured a candidate BSR and candidate RPs. However, some routers in the network are not learning the RP set. The engineer checks the BSR and sees that it is receiving candidate RP advertisements, but the BSR messages are not being forwarded to all routers. What is the most likely cause?

An engineer is troubleshooting multicast performance issues. The network uses PIM sparse mode with a static RP. The engineer notices that the multicast traffic from a source to a group is taking a suboptimal path, causing high latency. The engineer checks the multicast routing table on the last-hop router and sees that the (S,G) entry has an incoming interface that is not the shortest path to the source. What is the most likely reason for this suboptimal path?

A network engineer is configuring multicast on a Cisco router that connects to a multi-access network. The engineer wants to ensure that only one router forwards multicast traffic onto the segment to avoid duplication. The engineer enables PIM on the interface. However, multicast traffic is still being duplicated on the segment. What is the most likely reason?

An engineer is configuring multicast on a Cisco router. The router receives multicast traffic from a source on interface GigabitEthernet0/0 and needs to forward it to receivers on interface GigabitEthernet0/1. The engineer enables PIM sparse mode on both interfaces and configures a static RP. However, the router does not create a multicast routing entry for the (S,G) pair. What is the most likely missing configuration?

A network engineer runs the following command on Router R1: R1# show ip pim neighbor PIM Neighbor Table Neighbor Address Interface Uptime Expires Mode 10.1.1.2 GigabitEthernet0/0 2w0d 00:01:25 DR 10.1.1.3 GigabitEthernet0/0 2w0d 00:01:20 B Based on this output, what can be concluded?

A network engineer issues the following command on Router R2: R2# show ip mroute 239.1.1.1 IP Multicast Routing Table Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet, X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement, U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel, z - MDT-data group session, Y - Joined MDT-data group, y - Sending to MDT-data group Outgoing interface flags: H - Hardware switched, A - Assert winner Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode (*, 239.1.1.1), 00:03:45/00:02:15, RP 10.0.0.1, flags: S Incoming interface: GigabitEthernet0/0, RPF nbr 10.0.0.1 Outgoing interface list: GigabitEthernet0/1, Forward/Sparse, 00:03:45/00:02:15 Based on this output, what can be concluded?

A network engineer executes the following command on Router R3: R3# show ip igmp groups 239.2.2.2 IGMP Connected Group Membership Group Address Interface Uptime Expires Last Reporter 239.2.2.2 GigabitEthernet0/0 1d04h 00:02:10 192.168.1.100 Based on this output, what can be concluded?

A network engineer runs the following command on Router R4: R4# show ip pim rp mapping PIM Group-to-RP Mappings This system is an RP (Auto-RP) This system is an RP (BSR) Group(s) 224.0.0.0/4 RP 10.0.0.2 (?), v2v1 Info source: 10.0.0.2 (?), elected via Auto-RP, expires in 00:01:30 RP 10.0.0.3 (?), v2v1 Info source: 10.0.0.3 (?), elected via BSR, expires in 00:02:00 Based on this output, what can be concluded?

A network engineer issues the following command on Router R5: R5# show ip pim interface Interface PIM Nbrs Hello DR DR Count Intvl Prior GigabitEthernet0/0 on 2 30 1 10.1.1.1 GigabitEthernet0/1 on 1 30 1 10.2.2.2 Loopback0 on 0 30 1 10.3.3.3 Based on this output, what can be concluded?

A network engineer runs the following command on Router R6: R6# show ip pim rp 239.3.3.3 RP 10.0.0.4 Info source: 10.0.0.4, via bootstrap, priority 192, holdtime 150, expires in 00:02:30 Based on this output, what can be concluded?

A network engineer issues the following command on Router R7: R7# show ip pim tunnel Tunnel1: Type: PIM Encap Source: 10.0.0.7, Destination: 10.0.0.8 Status: up Based on this output, what can be concluded?

A network engineer runs the following command on Router R8: R8# show ip mroute count IP Multicast Statistics Group: 239.4.4.4, Source: 10.0.0.9 Packets: 1500, Bytes: 1200000, Average rate: 8000 pps, 5 sec rate: 0 pps Group: 239.5.5.5, Source: 10.0.0.10 Packets: 0, Bytes: 0, Average rate: 0 pps, 5 sec rate: 0 pps Based on this output, what can be concluded?

A network engineer issues the following command on Router R9: R9# show ip pim bsr-router PIMv2 Bootstrap Router (BSR) information This system is the Bootstrap Router (BSR) BSR address: 10.0.0.11 Uptime: 1w2d, BSR priority: 0, Hash mask length: 30 Next bootstrap message in 00:00:45 Based on this output, what can be concluded?

Consider the following configuration snippet on a Cisco IOS-XE router: interface GigabitEthernet0/1 ip address 10.1.1.1 255.255.255.0 ip pim sparse-mode ip igmp version 3 ! router ospf 1 network 10.1.1.0 0.0.0.255 area 0 ! What is the effect of this configuration?

Examine the following configuration on a Cisco IOS-XE router: ip multicast-routing distributed ! interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip pim sparse-dense-mode ip igmp version 2 ! Which statement about this configuration is true?

Given the following partial configuration on a Cisco IOS-XE router: ip pim rp-address 10.0.0.1 10 access-list 10 permit 224.0.0.0 0.255.255.255 ! interface GigabitEthernet0/0 ip pim sparse-mode ! What is the effect of this configuration?

Consider the following configuration on a Cisco IOS-XE router: ip multicast-routing ! interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.0 ip pim sparse-mode ip igmp static-group 239.1.1.1 ! What is the effect of the 'ip igmp static-group 239.1.1.1' command?

Examine the following configuration snippet: ip pim send-rp-announce Loopback0 scope 10 group-list 10 ip pim send-rp-discovery scope 10 access-list 10 permit 239.0.0.0 0.255.255.255 ! interface Loopback0 ip address 192.168.0.1 255.255.255.255 ip pim sparse-mode ! What is the purpose of this configuration?

Given the following configuration on a Cisco IOS-XE router: ip multicast-routing ! interface GigabitEthernet0/0 ip address 10.1.1.1 255.255.255.0 ip pim sparse-mode ip igmp version 2 ! router ospf 1 network 10.1.1.0 0.0.0.255 area 0 ! What is missing from this configuration to support Source-Specific Multicast (SSM) for group range 232.0.0.0/8?

What is the default IGMP version on a Cisco IOS interface when IP multicast routing is enabled?

Which PIM mode requires a rendezvous point (RP) to function?

What is the default multicast group range for Source-Specific Multicast (SSM) as defined by IANA and supported by Cisco IOS?

Drag and drop the steps of PIM-SM join and source registration into the correct order, from first to last.

Drag and drop the steps of RPF check verification for multicast forwarding into the correct order, from first to last.

Drag and drop the steps of IGMPv3 membership report processing into the correct order, from first to last.

Drag and drop the steps of IGMP v3 SSM membership report process into the correct order, from first to last.

Drag and drop the steps of PIM DM (Dense Mode) flood and prune steps into the correct order, from first to last.

Drag and drop the steps of multicast RP discovery using BSR into the correct order, from first to last.

Drag and drop the steps of multicast RP discovery using Auto-RP into the correct order, from first to last.

Drag and drop the steps of MSDP peering for inter-domain multicast into the correct order, from first to last.

Drag and drop the steps of IGMP v3 SSM membership report process into the correct order, from first to last.

Drag and drop the steps of PIM DM (Dense Mode) flood and prune steps into the correct order, from first to last.

Drag and drop the steps of Multicast RP discovery using BSR into the correct order, from first to last.

Drag and drop the steps of Multicast RP discovery using Auto-RP into the correct order, from first to last.

Drag and drop the steps of MSDP peering for inter-domain multicast into the correct order, from first to last.

Drag and drop each PIM mode on the left to its matching traffic distribution method on the right.

Drag and drop each IGMP version on the left to its matching feature on the right.

Drag and drop each multicast address range on the left to its matching use on the right.

Drag and drop each PIM message type on the left to its matching function on the right.

Drag and drop each multicast tree type on the left to its matching description on the right.

Drag and drop each PIM mode on the left to its matching traffic distribution method on the right.

Drag and drop each IGMP version on the left to its matching feature on the right.

Drag and drop each multicast address range on the left to its matching use on the right.

Drag and drop each PIM message type on the left to its matching function on the right.

Drag and drop each multicast tree type on the left to its matching description on the right.

Which two statements about PIM sparse mode are true? (Choose two.)

Which two statements about IGMP snooping are true? (Choose two.)

Which three statements about RPF check in IP multicast are true? (Choose three.)

Which three statements about multicast RP (Rendezvous Point) are true? (Choose three.)

Which two statements about PIM sparse mode (PIM-SM) are true? (Choose two.)

Which three statements about IGMP snooping are true? (Choose three.)

Which two statements about multicast RPF check are true? (Choose two.)

Which three statements about multicast group addresses and Layer 2 mapping are true? (Choose three.)