In an enterprise network running PIM sparse-mode, an engineer notices that multicast traffic is switched from the shared tree (*,G) to the source-specific tree (S,G) prematurely, causing micro-bursts on core links. Which command disables this automatic switchover behavior on a Junos router?
An enterprise network uses PIM sparse-mode across multiple routing instances. An administrator notices that source registration messages are looping between the designated router (DR) and the RP. Which configuration statement under [edit protocols pim] will prevent the DR from continuously encapsulating and sending register messages when no receivers are joined?
An engineer wants to restrict IGMP membership reports to only accept version 2 on a specific VLAN interface configured on an MX Series router. Which configuration statement achieves this requirement?
An administrator wants to configure a static Rendezvous Point (RP) with IP address 192.168.100.1 for all multicast groups on a Junos router. Which configuration accomplishes this?
An enterprise administrator wants to limit PIM sparse-mode join messages to prevent unauthorized sources from registering. Where should a policy be applied to filter PIM join/prune messages in Junos?
A network engineer troubleshoots an issue where multicast data packets are being dropped due to an RPF (Reverse Path Forwarding) check failure. The unicast routing table uses OSPF, but MBGP is deployed for multicast routing. Which operational command should the engineer use to verify the multicast RPF path for a specific source IP?
An administrator configures MSDP peering between two routers. After configuration, the MSDP session remains in the 'Connect' or 'Active' state and never transitions to 'Established'. Which underlying protocol dependency must be verified and operational for MSDP sessions to establish?
During multicast troubleshooting, an engineer notices that a router is not accepting MSDP Source-Active messages from a specific peer. Where should an export policy be applied to control which SA messages are sent or accepted via MSDP?
An administrator troubleshooting an IGMP snooping issue on an EX Series switch notices that multicast traffic is flooding all ports in a VLAN. Which Junos command verifies the IGMP snooping status and active querier on a specific VLAN?
An enterprise engineer is configuring Multicast Source Discovery Protocol (MSDP) on a Junos device. Which THREE statements accurately describe MSDP behavior and functions? (Choose three)
An administrator is designing a high-availability PIM sparse-mode network. Which THREE mechanisms are used to provide redundancy for Rendezvous Points (RPs)? (Choose three)
An engineer is troubleshooting PIM Sparse-Mode on a Junos device and notices that source traffic is not switching from the shared tree (*,G) to the shortest path tree (S,G) at the Last-Hop Router. Which configuration statement on the Junos routing instance allows adjusting the threshold for this switchover behavior?
During an audit of a multiregion enterprise network using PIM Sparse-Mode, an engineer needs to ensure that only designated Bootstrap Routers (BSRs) can inject candidate-RP information into the domain. Which Junos configuration feature should be applied on the core routers to secure the BSR domain?
An enterprise architect is designing an IP multicast solution using PIM Sparse-Mode and needs to configure a Rendezvous Point (RP) redundantly using Auto-RP. However, Junos OS does not natively support listening to Cisco Auto-RP discovery and announcement messages without specific helper configurations. Which TWO configuration steps are required on Junos to interoperate with or process Auto-RP messages? (Choose two)
An engineer needs to verify the Rendezvous Point (RP) currently learned by a Junos router via the Bootstrap Router (BSR) mechanism. Which operational command should be executed?
An enterprise network administrator is configuring PIM Sparse-Mode and needs to control which multicast groups are allowed to be joined or forwarded through the network. Which THREE methods or configuration elements can be used in Junos OS to filter multicast join messages or control group memberships? (Choose three)
A Junos router is configured with PIM sparse mode and acts as the Rendezvous Point (RP) for the multicast group 239.1.1.1. The network administrator notices that the RP has no (S,G) state for a particular source, yet receivers on the shared tree (*,G) are receiving traffic from that source. Which statement explains this behavior?
An engineer is deploying PIM Sparse-Mode in a campus network that uses a single static Rendezvous Point (RP) at 10.10.10.10. The design requires that the RP router also be the PIM Designated Router (DR) on the shared LAN segment where the RP address is configured. On the candidate RP router, which configuration is required to ensure the router wins the DR election on interface ge-0/0/1.0?
A network engineer is troubleshooting a PIM sparse-mode network where receivers are not receiving multicast traffic for group 239.1.1.1. The RP is correctly configured, and the shared tree is built to the RP. The engineer notices that the RP has (S,G) state but the last-hop router does not have (S,G) state. Which statement explains why the last-hop router is not receiving traffic?
An administrator is configuring a Junos router to act as a Candidate Rendezvous Point (C-RP) using the Bootstrap Router (BSR) mechanism for PIM Sparse-Mode. The administrator wants to advertise the router's loopback interface as the RP address for all multicast groups. Which configuration statement is required?
A network engineer is configuring a Bootstrap Router (BSR) in a PIM sparse-mode domain. The engineer wants to ensure that a specific Junos router becomes the BSR and that another router becomes a Candidate-RP (C-RP) for groups 239.1.0.0/16. Which configuration is required on the C-RP router?
You are deploying PIM sparse-mode in a Junos network where the rendezvous point must be dynamically learned and resilient to a single RP failure without requiring MSDP between the redundant RPs. You plan to use anycast RP with PIM. Which two statements describe how this deployment works on Junos? (Choose two.)
A Junos router running PIM sparse-mode is the first-hop router for source 172.16.5.5 sending to group 239.9.9.9. The RP for the group is reachable, but the RP has no receivers and no shared-tree state for the group. The source's traffic is being encapsulated in PIM register messages, yet the RP is not responding with register-stop. Which statement explains why the register process continues?
A network administrator needs to display the multicast routing table entries, including incoming interfaces and outgoing interface lists (OIL), on a Junos device. Which operational command should be used?
An administrator wants to configure MSDP (Multicast Source Discovery Protocol) between two autonomous system border routers to share active source information. Which configuration hierarchy in Junos is used to define the MSDP peer relationship?
An enterprise design requires configuring an Anycast RP setup using two Junos routers to provide redundancy for PIM sparse-mode. Which mechanism is required to synchronize source state information between the two Anycast RPs within the same AS?
An engineer configures protocol independent multicast (PIM) sparse-mode on a Junos device and notices that join messages are not reaching the Rendezvous Point (RP). Which CLI command should the engineer use to verify the operational state of the PIM neighbor adjacencies and confirm that the hello messages are successfully exchanged?
An engineer needs to view the MSDP Source-Active (SA) cache on a Junos router to verify which sources are currently active across different PIM domains. Which operational command should be executed?
An administrator wants to configure Candidate-RP (C-RP) advertisements using the Bootstrap Router (BSR) mechanism in PIM sparse-mode. Which hierarchy level in Junos is used to configure the local router as a Candidate-RP?
An administrator wants to configure an MSDP peer relationship on a Junos device and ensure that the MD5 password authentication is applied to the TCP session. Where is the MD5 authentication key configured for an MSDP peer?
An enterprise design uses PIM sparse-mode with a BSR. An engineer notices that the router has successfully elected a BSR, but no Candidate-RP messages are being processed. Which operational command should the engineer use to verify the BSR candidate information and elected BSR address on the router?
An engineer wants to configure a Junos router to act as a Bootstrap Router (BSR) for PIM sparse-mode. Which configuration hierarchy is used to enable the BSR function?
An enterprise network uses multiple routing instances with PIM sparse-mode. An engineer needs to configure Inter-AS multicast routing using MSDP. Which component is required to establish MSDP peering across different autonomous systems where BGP is also running?
An engineer needs to verify the Rendezvous Point (RP) currently learned via the Bootstrap Router (BSR) mechanism on a Junos device. Which operational command should be used?
An engineer is configuring PIM sparse-mode in an enterprise network. Which TWO characteristics are true regarding PIM sparse-mode operation? (Choose two)
An administrator is troubleshooting an MSDP deployment between two autonomous systems. Which THREE factors can cause an MSDP peer session to fail to establish? (Choose three)
An engineer is troubleshooting multicast forwarding and RPF failures on a Junos routing instance. Which THREE conditions will cause a multicast RPF check failure? (Choose three)
An enterprise network uses MBGP (Multicast BGP) alongside PIM sparse-mode. Which THREE statements accurately describe the function of MBGP in a multicast environment? (Choose three)
An administrator is configuring IGMP snooping on an EX Series switch. Which TWO benefits does IGMP snooping provide in a switched Ethernet environment? (Choose two)
An administrator is configuring a Junos device to support IGMPv3 on user-facing VLAN interfaces. Which configuration statement enables IGMPv3 processing on interface irb.10?
A network engineer must implement Anycast RP using MSDP between two data center routers running Junos OS. Which statement correctly describes a core requirement for MSDP peer establishment?
An enterprise has deployed MSDP between two independent PIM sparse-mode domains. An administrator notices that Source-Active (SA) messages are looping between MSDP peers. Which Junos mechanism should be configured to prevent SA message loops in an MSDP topology?
A network administrator is configuring an enterprise router to join the Source-Specific Multicast (SSM) range. According to RFC standards, what is the standard IPv4 address block reserved for SSM?
An engineer is troubleshooting a multicast forwarding issue where data from a specific source is not reaching receivers in a remote PIM sparse-mode domain. Which THREE operational commands and diagnostic steps should be used to verify the multicast forwarding state and RPF path on a Junos router? (Choose three)
An enterprise network runs PIM sparse-mode with a static RP. A Junos router receives a PIM Register message from a directly connected first-hop router for a new multicast source. The router is the RP for that group. Which action does the RP take upon receiving the Register message?
You administer a Junos router that has two equal-cost paths toward the PIM rendezvous point for group 239.1.1.1. Users report intermittent multicast outages whenever the unicast route to the RP flaps. You want to eliminate the dependency on unicast reachability to the RP for this group. Which configuration accomplishes this?
A network engineer is troubleshooting a PIM Sparse-Mode domain where multicast traffic from a source is not reaching receivers. The engineer suspects that the Rendezvous Point (RP) is not receiving PIM Register messages from the First-Hop Router (FHR). Which TWO statements describe reasons why the FHR might fail to send Register messages to the RP? (Choose two.)
An enterprise network runs PIM sparse-mode with a static RP configured on all routers. Users on a VLAN report that they can receive multicast streams from external sources, but the internal server 10.10.5.20 streaming to group 239.1.1.1 was just migrated to a new subnet. After the migration, receivers on a different VLAN stop receiving the stream, even though the new subnet is reachable and PIM is enabled on all interfaces. Which configuration element is most likely missing?
A Junos router is the last-hop router for receivers in VLAN 100. The receivers use IGMPv3 and request group 239.5.5.5 from source 10.10.10.10 only. The router has a PIM sparse-mode shared tree (*,G) toward the RP, but traffic from 10.10.10.10 is not being delivered to the receivers. The unicast route to 10.10.10.10 points out a different interface than the one toward the RP. Which action resolves the problem?
An administrator is enabling PIM sparse-mode on a Junos router that connects to a Layer 2 switch carrying several user VLANs. Receivers on those VLANs need to join multicast groups, but the router is not seeing any IGMP membership reports from the hosts. PIM is enabled on the router's interface toward the switch. Which action is required on the router to receive IGMP reports?
A Junos router connects to a Layer 2 switch that has multiple receivers on VLAN 200. The switch is not running PIM, and the router is the only multicast router on the segment. You want the router to send IGMP general queries on the VLAN 200 interface and track receiver group memberships. Which configuration is required?
An ISP engineer is troubleshooting an interdomain multicast deployment. A receiver in AS 65001 wants to receive a stream sourced in AS 65002. The RP in AS 65001 has no (S,G) state for the source, and the RP in AS 65002 is not sending any Source-Active messages. Both RPs are configured as MSDP peers over a working TCP session. Which statement explains why the RP in AS 65001 lacks source information?
An engineer is deploying PIM sparse-mode with anycast RP using two Junos routers that share the loopback address 10.0.0.1/32. Both routers are configured as static RPs for all groups and as MSDP peers with each other using their unique loopback addresses. Receivers attached to Router A join a group whose source is registered with Router B. Traffic initially flows, but after Router B reloads, receivers lose the stream even though Router A still has the anycast RP address reachable. Which mechanism is responsible for restoring source information to Router A?