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NEW QUESTION # 122
Which two authentication methods are available for OSPF on Junos devices? (Choose two.)
Answer: A,C
NEW QUESTION # 123
Which two BGP communities are pre-defined well-known communities? (Choose two.)
Answer: B,C
NEW QUESTION # 124
Exhibit
Referring to the exhibit. R2 receives a packet from the multicast source on its ge-0/0/4 0 interface.
Which two statements are correct in this scenario? (Choose two.)
Answer: C,D
Explanation:
The exhibit illustrates a PIM multicast environment where routerR2has received a multicast packet from Source 1 (192.168.100.10)on itsge-0/0/4.0interface. To prevent loops, PIM-SM uses a mechanism called Reverse Path Forwarding (RPF).
* RPF Check Process (Option A):When a multicast packet arrives, the router performs an RPF check by looking up the source's IP address in itsunicast routing table(typically inet.0).
* The exhibit's command output, show multicast rpf 192.168.100.10, explicitly shows that for the source network $192.168.100.0/24$, theRPF interfaceisge-0/0/1.0.
* Because the packet actually arrived onge-0/0/4.0instead of the expected ge-0/0/1.0 interface, the RPF check fails.
* Packet Discard (Option C):According to standard PIM-SM operation in Junos OS 24.4, if a multicast packet fails the RPF check-meaning it arrived on an interface that the router does not use to reach the source via unicast-the packet isdiscarded. This is a fundamental loop-prevention mechanism that ensures multicast traffic is only accepted from the shortest path toward the source.
* Option B is incorrectbecause the router will not add any interfaces to the Outgoing Interface List (OIL) for a packet that fails the initial RPF check.
* Option D is incorrectbecause the exhibit clearly shows the interface in the RPF table (ge-0/0/1.0) is different from the interface where the packet was received (ge-0/0/4.0).
NEW QUESTION # 125
Click the Exhibit button.
Referring to the exhibit, which two statements are true? (Choose two.)
Answer: A,D
Explanation:
The RP has an S,G entry with a prune state toward the source, which means it is not interested in receiving traffic from that specific source for that multicast group.
The S,G state identifies forwarding information for traffic from a specific source to a specific multicast group, which is used after the receiver-side router switches to the shortest-path tree.
NEW QUESTION # 126
Which two EVPN types advertise an ESI without advertising a MAC address? (Choose two.)
Answer: A,D
Explanation:
In an EVPN-VXLAN environment, different BGP route types serve distinct purposes in building the control plane. TheEthernet Segment Identifier (ESI)is a unique 10-byte identifier used to represent a multi-homed segment.
* Type 1: Ethernet Auto-Discovery (A-D) Route (Option A):This route type is essential for multi- homing scenarios. It carries theESIto support features likefast convergenceandaliasing. By advertising an A-D route per Ethernet Segment, a PE tells other routers that it is connected to that specific ESI. It doesnotcarry individual host MAC addresses; instead, it provides a "mass withdraw" mechanism to quickly update paths if the entire segment goes down.
* Type 4: Ethernet Segment Route (Option D):This route is used exclusively forDesignated Forwarder (DF) election. It advertises the existence of anESIand the ES-Import Route Target to all other PE routers. This allows PE routers connected to the same multi-homed segment to discover each other automatically and elect a DF to handle BUM traffic. Like Type 1, it focuses on the segment identity and doesnotinclude MAC addresses.
* Type 2: MAC/IP Advertisement Route (Option B):This is the primary route used for host reachability. Itmustinclude a MAC address (and optionally an IP). While it also includes the ESI to indicate which segment the host is behind, its primary function is MAC advertisement.
* Type 3: Inclusive Multicast Ethernet Tag Route (Option C):This route is used for VTEP discovery and building the replication list for BUM traffic. It identifies the VTEP's IP and the VNI, but it doesnot carry the ESI or MAC addresses.
NEW QUESTION # 127
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