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Exam JN0-364 Training - JN0-364 Questions

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JN0-364 Questions - Certification JN0-364 Exam

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Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) Sample Questions (Q14-Q19):

NEW QUESTION # 14
The MPLS Label Information Base (LIB) is stored in which table?

A. inet6.0
B. inet.0
C. mpls.0
D. inet.3

Answer: C

Explanation:
In Junos OS, the Routing Engine maintains several different tables to manage various types of reachability and forwarding information. When a router is running MPLS, it must track both IP routes and label-to-label mappings.
Thempls.0table is the primary repository for theLabel Information Base (LIB)and theLabel Forwarding Information Base (LFIB). According to Juniper Networks documentation, mpls.0 is used by transit and egress routers to perform label lookups. When a labeled packet arrives at an interface, the router looks at the top label and references the mpls.0 table to determine the next action. This table stores the mapping of incoming labels to their corresponding operations:Pop(remove the label),Swap(replace the label), orPush(add an additional label).
It is crucial to understand the roles of the other tables to avoid confusion:
* inet.0 (Option D):This is the default unicast routing table for IPv4, used for standard IP-to-IP forwarding.
* inet.3 (Option C):This is theMPLS Path Table. It stores the egress loopback addresses of LSPs and is used by BGP for next-hop resolution to determine if a destination can be reached via an MPLS tunnel.
While inet.3 knowsaboutLSPs, the actual label-switching instructions reside in mpls.0.
* inet6.0 (Option A):This is the default unicast routing table for IPv6.
Therefore, for the specific purpose of storing the label base used for transit switching operations,mpls.0is the correct and only table used in the Junos architecture.

NEW QUESTION # 15
Exhibit:

on a Juniper switch. It shows interfacexe-0/0/4withunit 0andfamily ethernet-switching. Under vlan, it lists members 10;`] Referring to the exhibit, which two statements are true? (Choose two.)

A. The interface is a part of a VLAN that uses VLAN ID 10.
B. The interface receives tagged traffic.
C. The interface receives untagged traffic.
D. The interface is a member of the VLAN named 10.

Answer: C,D

Explanation:
In Junos OS for switching platforms, an interface is configured for Layer 2 bridging under thefamily ethernet- switchinghierarchy. The way an interface handles VLAN traffic depends on its port mode:accessortrunk.
According to Juniper Networks technical documentation, when an interface is configured simply with members <vlan-name/id>, it defaults to anaccess port. In an access port configuration:
* The port is a member of only a single VLAN.
* The portreceives and sends untagged traffic (Option C). Any untagged frame arriving at this interface is implicitly associated with the configured VLAN member.
* The interface does not expect or process 802.1Q tags in incoming frames.
In the exhibit, interface xe-0/0/4 has members 10;. In Junos, the members statement can reference either a VLAN nameor aVLAN ID. However, when the configuration is shown as members 10; without further context of the specific ID mapping, the most precise interpretation of the CLI output provided is thatthe interface is a member of the VLAN named 10 (Option D). While "10" could be the numerical ID, Junos primarily maps members by their defined administrative name.
Why other options are incorrect:
* Option A:Access ports do not receive tagged traffic; only trunk ports (which require the port-mode trunk and vlan members [ ... ] statements) are designed to process tagged frames.
* Option B:While the VLAN named 10likelyhas a VLAN ID of 10, the exhibit does not explicitly confirm the ID mapping. In Junos, a VLAN named "10" could technically have a different tag ID (e.g., VLAN "Office" with ID 10). Option D is the more accurate direct reading of the displayed member configuration.

NEW QUESTION # 16
You have configured an MPLS LSP that begins on R1 and terminates on R5 using the Junos default settings.
Referring to the exhibit, which router will perform only label swap operations?

A. R1
B. R5
C. R3
D. R4

Answer: C

Explanation:
In an MPLS network, routers are categorized by their role along a Label Switched Path (LSP). In this scenario, the LSP originates onR1 (Ingress LER)and terminates onR5 (Egress LER). Between these two endpoints are the Provider (P) routers, also known as Transit Label Switching Routers (LSRs), which include R2, R3, and R4.
To identify which router performsonlylabel swap operations, we must look at the standard Junos data plane behavior:
* R1 (Ingress LER):Performs aPushoperation. It receives native IP traffic from Networks 1 or 2, looks up the destination, and imposes (pushes) an MPLS label onto the packet before sending it to R2.
* R2 and R3 (Transit LSRs):These routers perform aSwapoperation. They receive a labeled packet, look up the incoming label in their Label Forwarding Information Base (LFIB), replace it with an outgoing label provided by the downstream neighbor, and forward it.
* R4 (Penultimate Hop):By default, Junos usesPenultimate Hop Popping (PHP). Because R4 is the second-to-last router before the egress (R5), the egress router R5 advertises an "implicit-null" label (Label 3) to R4. This instructs R4 to perform aPopoperation-removing the MPLS label entirely-and sending the native IP packet to R5.
* R5 (Egress LER):Receives the packet (which is already unlabeled due to PHP) and performs a standard IP route lookup to reach the final destination in Network 3 or 4.
Among the options provided,R3is the only router that is a transit LSR butnotthe penultimate hop. While R2 also performs a swap, it is not an option. R4 performs a Pop (due to PHP), R1 performs a Push, and R5 performs an IP lookup. Therefore, R3 is the correct answer as it solely performs the label swap operation.

NEW QUESTION # 17
Which OSPF packet type is used to initiate and maintain neighbor relationships?

A. Database Description
B. Hello
C. Link-State Acknowledgment
D. Link-State Update

Answer: B

Explanation:
TheHello packetis the most basic, yet most vital, component of the OSPF protocol. It serves as the primary mechanism for neighbor discovery, parameter negotiation, and "keepalive" functionality. Per Juniper Networks' routing documentation, OSPF routers use the Hello protocol to dynamically discover other OSPF- enabled routers on their directly connected segments.
When OSPF is enabled on a Junos interface, the router begins multicasting Hello packets (typically to the
224.0.0.5"All OSPF Routers" address). This initiates the neighbor relationship. For two routers to move beyond theInitstate and become neighbors, they must agree on several critical parameters contained within the Hello packet:
* Area ID:Routers must be in the same OSPF area.
* Authentication:Passwords or keys must match.
* Timers:The Hello and Dead intervals must be identical.
* Options:Such as Stub area flags.
Beyond the initial "initiation," the Hello packet is used tomaintainthe relationship. By continuously sending these packets at a fixed interval (the Hello interval), a router signals to its peers that it is still functional. If a router stops receiving Hello packets from a neighbor for a duration exceeding theDead Interval, it declares the neighbor "down," flushes the associated LSAs from the database, and triggers a new SPF calculation.
Furthermore, on multi-access networks like Ethernet, the Hello packet is the vehicle for the election of the Designated Router (DR)andBackup Designated Router (BDR). By exchanging priority values and Router IDs within the Hello packets, the segment can elect a central point of contact to minimize the number of adjacencies required on the wire.

NEW QUESTION # 18
During OSPF neighbor establishment, which packet type is used to describe the contents of the link-state database?

A. Hello packet
B. Link-State PDU (LSP)
C. Link-State Request (LSR)
D. Database Description (DBD)

Answer: D

Explanation:
In theOSPF (Open Shortest Path First)protocol, ensuring that all routers within an area have a synchronized Link-State Database (LSDB)is fundamental to building a consistent loop-free topology. During the adjacency formation process-specifically when transitioning from theExStartstate to theExchangestate- routers must determine what information they are missing from their neighbors without sending the entire database at once, which would be highly inefficient.
TheDatabase Description (DBD)packet, also known as a DDP, is the mechanism used for this summary exchange. According to Juniper Networks technical documentation, the DBD packet does not contain full Link-State Advertisements (LSAs). Instead, it contains only theLSA headers, which include the LSA type, the ID of the advertising router, and the sequence number.
By exchanging these headers, a Juniper router can compare the neighbor's database summary against its own local LSDB. If the router identifies a header in the DBD packet that represents a newer or missing entry, it records that LSA in its "Link-State Request List." This collaborative "handshake" ensures that only the necessary, updated information is requested in the subsequentLink-State Request (LSR)phase. It is important to distinguish this from theLink-State PDU (LSP)mentioned in Option D, which is actually the term used in the IS-IS protocol, not OSPF. In OSPF, the functional unit is the LSA, and the transport vehicle for the initial summary is the DBD packet. This methodical synchronization is what allows OSPF to scale effectively in large service provider environments.

NEW QUESTION # 19
......

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