Valid JN0-364 Exam Q&A PDF JN0-364 Dump is Ready (Updated 180 Questions) [Q92-Q117]

Valid JN0-364 Exam Q&A PDF JN0-364 Dump is Ready (Updated 180 Questions)

Exam Questions and Answers for  JN0-364 Study Guide

NEW QUESTION # 92
Which term describes the router where traffic enters an MPLS label-switched path (LSP)?

• A. ingress router
• B. egress router
• C. transit router
• D. penultimate router

Answer: A

Explanation:
In the architecture of aLabel-Switched Path (LSP), routers are categorized based on their role in the handling of a specific packet's lifecycle through the MPLS network. Juniper Networks documentation defines these roles clearly:
TheIngress Router (Option D), also known as theIngress Label Edge Router (LER), is the entry point of the LSP. Its primary responsibility is to take an incoming "unlabeled" packet (usually a standard IPv4 or IPv6 packet), perform a route lookup, and determine which LSP the packet should follow. Once determined, the Ingress router performs aPushoperation, where it encapsulates the packet with an MPLS label header and forwards it toward the next hop. This is where the transition from IP-based forwarding to Label-based switching occurs.
To contrast this with the other options:
* Transit Router (Option B):These are routers located between the ingress and egress. They perform Swapoperations, replacing an incoming label with an outgoing label based on the Label Forwarding Information Base (LFIB).
* Egress Router (Option A):This is the "tail-end" of the LSP where the packet exits the MPLS domain and the final label is removed (if it hasn't been removed already by the penultimate hop).
* Penultimate Router (Option C):This is the second-to-last router in the path. As discussed in previous questions, it often performs thePopoperation (Penultimate Hop Popping) to remove the transport label before sending the packet to the Egress LER.
Therefore, the router where traffic first "enters" the LSP and receives its initial label is strictly defined as the Ingress router.

NEW QUESTION # 93
Click the Exhibit button. You must configure the router called ROUTER_1 to take all valid prefixes learned from internal BGP peers in AS 64523, and then re-advertise them to other internal BGP peers in the same autonomous system.
Referring to the exhibit, which configuration must you deploy on ROUTER_1 to accomplish this task?

• A. Configure ROUTER_1's internal BGP group with the keyword cluster, followed by a unique 32- bit number.
• B. Configure ROUTER_1 to belong to a different autonomous system than the other BGP routers in your network.
• C. Configure ROUTER_1's internal BGP group with a routing policy that exports prefixes learned from internal BGP.
• D. Configure a routing policy on ROUTER_1 that removes the no-exportBGP community from all received prefixes.

Answer: A

Explanation:
To re-advertise routes learned from iBGP peers to other iBGP peers within the same AS, ROUTER_1 must act as a route reflector. On Junos, enabling route reflection is done by configuring a cluster ID under the internal BGP group. The cluster ID uniquely identifies the route- reflector cluster and allows ROUTER_1 to reflect iBGP-learned routes to its other iBGP neighbors.

NEW QUESTION # 94
What is the default export behavior of IS-IS in the Junos OS?

• A. to export nothing
• B. to export only IPv6 routes
• C. to export only external routes
• D. to export ail learned prefixes

Answer: A

Explanation:
In Junos OS, IS-IS does not automatically export routes from the routing table into the IS-IS protocol. By default, no routes are advertised into IS-IS unless an explicit export policy is configured to control which prefixes should be advertised.

NEW QUESTION # 95
What happens if an IS-IS router receives a link-state PDU with a higher sequence number than the one in its database?

• A. It sends a CSNP to request confirmation from the source of the link-state PDU.
• B. It resets the adjacency with the source of the link-state PDU.
• C. It updates its database and floods the link-state PDU.
• D. It ignores the link-state PDU

Answer: C

Explanation:
When an IS-IS router receives a link-state PDU with a higher sequence number than the version stored in its link-state database, it recognizes the received LSP as newer information. The router updates its own database with this newer LSP and then floods it to its other neighbors to ensure the updated topology information is propagated throughout the network.

NEW QUESTION # 96
What happens if an IS-IS router receives a link-state PDU with a higher sequence number than the one in its database?

• A. It sends a CSNP to request confirmation from the source of the link-state PDU.
• B. It resets the adjacency with the source of the link-state PDU.
• C. It updates its database and floods the link-state PDU.
• D. It ignores the link-state PDU.

Answer: C

Explanation:
IS-IS is a link-state protocol that relies on the rapid and consistent flooding ofLink-State PDUs (LSPs)to ensure that every router in an area has an identical view of the topology. To manage the "freshness" of information, IS-IS uses aSequence Number-a 32-bit unsigned integer that increments every time the originating router makes a change to its LSP.
According to Juniper Networks technical documentation, when a router receives an LSP, it performs a comparison between the received LSP and the version it currently holds in itsLink-State Database (LSDB).
If the received LSP has ahigher sequence number, the router concludes that this is "newer" and more accurate information. The router will then perform two immediate actions:
* Update:It replaces the older LSP in its LSDB with the newly received version.
* Flood:It propagates the new LSP to all other neighbors (except the one that sent it) to ensure the entire area converges on the new data.
If the sequence numbers were equal, the router would ignore the incoming PDU as it already has the information. If the received sequence number werelower, the router would conclude its own database is more recent and would actually send its own "newer" version back to the neighbor to bring them up to date (a process called "poisoning" or refreshing the neighbor).Complete Sequence Number PDUs (CSNPs)(Option C) are used during initial database synchronization or periodic checks on broadcast links, but the primary response to a "newer" LSP is immediate database update and flooding.

NEW QUESTION # 97
You are a network architect designing a brand new network. You want to deploy RSVP LSPs in this network.
You are currently in the process of choosing whether to run OSPF or IS-IS as your interior gateway protocol.
In this scenario, which two statements are correct about IGP traffic engineering extensions in an RSVP network? (Choose two.)

• A. In OSPF, traffic engineering extensions are enabled by default.
• B. In IS-IS, traffic engineering extensions are enabled by default.
• C. You must explicitly configure IS-IS to carry traffic engineering extensions.
• D. You must explicitly configure OSPF to carry traffic engineering extensions.

Answer: B,D

Explanation:
In a Juniper Networks environment, deployingRSVP-signaled LSPsrequires a functionalTraffic Engineering Database (TED). This database is populated by the Interior Gateway Protocol (IGP) using specific extensions that carry link-state information beyond simple reachability, such as available bandwidth, administrative groups (link coloring), and Maximum Reservable Bandwidth.
The behavior of these extensions differs betweenOSPFandIS-ISin Junos OS:
* OSPF (Option C):By default, OSPF is a "pure" routing protocol. To support RSVP-TE, it must carry Opaque LSAs (Type 10). According to Juniper documentation, you mustexplicitly configuretraffic engineering within the OSPF protocol hierarchy using the set protocols ospf traffic-engineering command. Without this command, OSPF will not flood the TE information required by the Constrained Shortest Path First (CSPF) algorithm, and LSPs will fail to establish.
* IS-IS (Option D):IS-IS was designed to be extensible through the use of TLVs (Type, Length, Value).
In Junos OS,IS-IS traffic engineering extensions are enabled by defaultonce the protocol is active.
As soon as you enable IS-IS on an interface, it begins to advertise the wide metrics and TE TLVs (like TLV 22 and 135) necessary for building the TED.
This distinction is a common design consideration for network architects. While IS-IS simplifies the rollout of MPLS by having TE enabled "out of the box," OSPF requires that extra configuration step to transition from a standard IGP to a TE-aware protocol.

NEW QUESTION # 98
Which IS-IS adjacency state indicates that hello packets have been exchanged but the adjacency is not yet fully established?

• A. initializing
• B. up
• C. loading
• D. two-way

Answer: A

Explanation:
The initializing state indicates that IS-IS hello packets have been exchanged between neighbors and the routers have detected each other, but the adjacency has not yet progressed to the fully established state where databases are synchronized.

NEW QUESTION # 99
A service provider is onboarding a new enterprise customer that operates multiple branch offices, each with its own set of VLANs. The customer requires transparent Layer 2 connectivity between sites while maintaining separation of internal VLANs. The provider must also ensure that customer VLAN identifiers do not conflict with other customers on the shared infrastructure. Which solution would provide the desired results?

• A. Aggregate customer traffic using GRE tunnels.
• B. Deliver Layer 3 VPN services using MPLS.
• C. Extend customer VLANs using Q-in-Q tunneling.
• D. Provide Internet access with NAT and firewall services.

Answer: C

Explanation:
In a service provider environment,Q-in-Q tunneling(also known as 802.1ad or double-tagging) is the standard solution for transporting multiple customer VLANs over a shared provider backbone while maintaining total separation.
According to Juniper Networks documentation, Q-in-Q works by adding a second 802.1Q tag (theService Provider tagor S-tag) to the customer's already tagged frames (theCustomer tagor C-tag). This creates a
"tunnel" at Layer 2. This solution specifically addresses all the customer's requirements:
* Transparent Layer 2 Connectivity:Because the provider simply encapsulates the customer's frames, the customer's internal BPDU traffic (like Spanning Tree) and VLAN tags are preserved and delivered transparently to the remote site.
* Separation of Internal VLANs:The customer can run their own internal VLAN IDs (1-4094) without the provider needing to know or manage them.
* Conflict Avoidance:Different customers on the same provider infrastructure are assigned unique S- tags. Even if two different customers both use "VLAN 10" internally, they remain isolated because their traffic is encapsulated in different provider S-tags.
Why other options are incorrect:
* Layer 3 VPN (Option B):While MPLS L3VPNs are common, they provide Layer 3 (IP) connectivity, not the "transparent Layer 2" connectivity requested.
* GRE Tunnels (Option C):GRE is a Layer 3 encapsulation and does not natively provide the transparent VLAN bridging required for a multi-site Layer 2 service.
* NAT/Firewall (Option D):These are security and address-translation services for internet access and do not facilitate site-to-site Layer 2 bridging.

NEW QUESTION # 100
What information is determined by using the AS path attribute included in the BGP update message? (Choose two.)

• A. the total number of next-hop devices to reach a prefix
• B. the shortest AS path to reach a prefix
• C. the presence of a routing loop
• D. the origin of a route from IGP or EGP

Answer: B,C

NEW QUESTION # 101
In an OSPF network, what is a purpose of a designated router?

• A. to flood routes to all other OSPF devices in the entire domain
• B. to forward traffic within the configured subnet
• C. to reduce OSPF traffic on the OSPF segment
• D. to assign an OSPF router ID to all routers in the OSPF segment

Answer: C

Explanation:
A designated router is elected on multiaccess OSPF networks to minimize the number of adjacencies and reduce the amount of OSPF control traffic. Instead of every router forming a full adjacency with every other router on the segment, routers form adjacencies with the designated router, which then manages the distribution of link-state updates on that segment.

NEW QUESTION # 102
You are designing a high availability solution for a Juniper router with dual Routing Engines (RE). You want to ensure that the routing protocol state is preserved during an RE switchover. You have already enabled graceful Routing Engine switchover (GRES) and you want to avoid relying on helper routers to maintain the routing protocol state. In this scenario, which feature would accomplish this behavior?

• A. graceful restart
• B. non-stop active bridging
• C. non-stop active routing
• D. bidirectional forwarding detection

Answer: C

Explanation:
When designing High Availability (HA) for Juniper Service Provider routers, understanding the interaction between the control plane and data plane is vital. The user has already enabledGraceful Routing Engine Switchover (GRES), which synchronizes the interface and kernel state between the primary and backup Routing Engines (REs). However, GRES by itself does not preserve the routing protocol state (like OSPF adjacencies or BGP sessions).
To achieve the preservation of the routing protocol state without relying on external "helper" routers, you must implementNon-Stop Active Routing (NSR). According to Juniper Networks documentation, NSR uses the infrastructure provided by GRES to also synchronize the routing protocol process (rpd) information.
Under NSR, the backup RE maintains a "hot" standby state of all routing protocols. If the primary RE fails, the backup RE takes over immediately. Because it already possesses the full routing table and peer session states, the peering neighbors are unaware that a switchover occurred. No protocol adjacency resets occur, and traffic continues to flow uninterrupted.
It is crucial to differentiate NSR fromGraceful Restart (Option C). While Graceful Restart also aims to maintain traffic flow during a switchover, itdoesrequire help from neighboring routers (known as "helper mode"). If the neighbors do not support or are not configured for Graceful Restart, the sessions will drop.
Since the user explicitly stated they want to "avoid relying on helper routers," Graceful Restart is not the correct solution.
Non-stop Active Bridging (Option A)provides a similar "hitless" failover but specifically for Layer 2 environments (STP/VLANs) rather than Layer 3 routing protocols.BFD (Option B)is a failure detection protocol used to speed up convergence but does not preserve state during an RE failover; in fact, without NSR, BFD would likely trigger a faster teardown of the session during a switchover. Therefore,NSRis the only feature that meets the requirement for independent control-plane preservation.

NEW QUESTION # 103
Referring to the exhibit, what is the minimum number of LSPs required to support all four networks?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: B

Explanation:
Given the RSVP Signaled Service Provider MPLS Core network shown in the exhibit, only a single Label Switched Path (LSP) is required to support all four networks because MPLS can use label stacking to multiplex multiple LSPs over a single physical path. Therefore, one LSP can be established through the MPLS core, and all networks can use this LSP with different label stacks.

NEW QUESTION # 104
Referring to the exhibit, where should next-hop-self-policy be applied to alter the next-hop value?

• A. The policy is applied as an export policy for the group ext-64501.
• B. The policy is applied as an export policy for the group int-64503.
• C. The policy is applied as an Import policy for the group ext-64501.
• D. The policy is applied as an import policy for the group int-64503.

Answer: A

Explanation:
The next-hop-self-policy policy is used to alter the next-hop attribute of BGP routes. When you apply it as an export policy to an external BGP (eBGP) group, it changes the next-hop attribute of the routes being advertised to eBGP neighbors so that the next-hop IP address is the IP address of the router itself. This ensures that the eBGP neighbors use the local router as the next hop to reach these routes.

NEW QUESTION # 105
You are bringing a new network online with three IS-IS routers using default Junos election priorities. The routers are configured as Level 2 only IS-IS routers. Which statement is true about the DIS election in this scenario?

• A. The router with the lowest MAC address will be elected as the DIS.
• B. The router with the lowest numerical lo0 IP address will be elected as the DIS.
• C. The router with the highest numerical lo0 IP address will be elected as the DIS.
• D. The router with the highest MAC address will be elected as the DIS.

Answer: D

Explanation:
A router's priority for becoming the designated router is indicated by an arbitrary number from 0 through 127, which you configure on the IS-IS interface. The router with the highest priority becomes the designated router for the area (Level 1, Level 2, or both), also configured on the IS- IS interface. If routers in the network have the same priority, then the router with the highest MAC address is elected as the designated router. By default, routers have a priority value of 64.

NEW QUESTION # 106
You are troubleshooting a Level 1 IS-IS router that has an adjacency with a Level 1/2 router. Which two statements are correct in this scenario? (Choose two.)

• A. The Level 1 router will only learn the topology of the Level 1 network.
• B. The Level 1/2 router merges Level 1 and Level 2 into one complete topology.
• C. The Level 1 router will learn the full topology of the Level 2 network.
• D. The Level 1/2 router sees the Level 1 network and the Level 2 network as two separate topologies.

Answer: A,D

Explanation:
In the context ofJuniper Networks Junos OSand theIS-IS (Intermediate System to Intermediate System) protocol, understanding the hierarchical relationship between router levels is critical for effective troubleshooting and design. IS-IS uses a two-level hierarchy to manage scalability:Level 1 (L1), which represents intra-area routing, andLevel 2 (L2), which represents inter-area backbone routing.
When a router is configured as aLevel 1/2 (L1/L2)device, it acts as a bridge between the two levels.
According to Juniper technical documentation, an L1/L2 router maintains two completelyseparate Link- State Databases (LSDB)-one for Level 1 and one for Level 2. It does not merge these into a single topology. This separation ensures that local area topology changes (L1) do not necessarily flood into the backbone (L2) unless specific redistribution is configured, and vice versa. Therefore, statementCis correct because the L1/L2 router maintains distinct SPF (Shortest Path First) computations for each level.
Regarding the visibility of the Level 1 router, IS-IS is designed to keep L1 areas "stubby" by default. ALevel
1 routeronly possesses the topology information for its own area (the Level 1 LSDB). It does not receive specific L2 routes or the L2 topology. Instead, the L1/L2 router sets theAttached (ATT) bitin its L1 Link- State PDUs (LSPs) to signal to L1-only routers that it has a connection to the backbone. The L1 router then generates a default route pointing to the L1/L2 router to reach inter-area destinations. This confirms that statementDis correct: the L1 router's knowledge is limited to its local L1 topology.
Conversely, statements A and B are incorrect because merging topologies would violate the hierarchical scaling principles of IS-IS, and L1 routers never learn the full L2 topology without explicit, non-standard route leaking.

NEW QUESTION # 107
Which OSPF packet type is used to initiate and maintain neighbor relationships?

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

Answer: D

Explanation:
Hello packets are used by OSPF routers to discover neighbors and establish adjacency relationships. They are also sent periodically to maintain the neighbor relationship and verify that neighboring routers are still reachable.

NEW QUESTION # 108
Which two protocols would be used for dynamic routing in IPv6 environments? (Choose two.)

• A. IGMP
• B. OSPFv2
• C. IS-IS
• D. BGP

Answer: C,D

Explanation:
The transition to IPv6 requires routing protocols that are capable of carrying 128-bit address information.
Juniper Networks Junos OS supports several "IPv6-ready" protocols for dynamic routing.
1. IS-IS (Option B):
As discussed in previous questions,IS-ISis inherently extensible due to its use ofTLVs (Type, Length, Value)
. To support IPv6, the protocol did not need a major rewrite; instead, new TLVs (such as TLV 236 for IPv6 reachability and TLV 232 for IPv6 interface addresses) were added. A single IS-IS process in Junos can simultaneously carry both IPv4 and IPv6 routing information, making it a highly efficient choice for "dual- stack" service provider backbones.
2. BGP (Option D):
BGP was updated to support multiple protocols throughMultiprotocol Extensions (MP-BGP), defined in RFC 4760. By usingAddress Family Identifiers (AFI)andSubsequent Address Family Identifiers (SAFI), a single BGP session can exchange NLRI (Network Layer Reachability Information) for IPv4 unicast, IPv6 unicast, and even VPNv4/VPNv6 routes. In Junos, this is configured under the family inet6 unicast hierarchy within the BGP protocols configuration.
Why other options are incorrect:
* IGMP (Option A):This is a management protocol for IPv4 multicast (Internet Group Management Protocol). Its IPv6 equivalent isMLD (Multicast Listener Discovery).
* OSPFv2 (Option C):OSPF version 2 is strictly for IPv4. To run OSPF in an IPv6 environment,OSPFv3 must be used, as it was specifically redesigned to handle the IPv6 address space and link-local communication.

NEW QUESTION # 109
How are routing loops prevented in internal BGP networks?

• A. External BGP routes are never readvertised to other internal BGP neighbors.
• B. Internal BGP routes are never readvertised to other internal BGP neighbors.
• C. External BGP routes are never readvertised to other external BGP neighbors.
• D. Internal BGP routes are never readvertised to other external BGP neighbors.

Answer: B

Explanation:
In iBGP, routes learned from one internal BGP neighbor are not advertised to other internal BGP neighbors. This rule prevents routing loops within the autonomous system and is the reason a full mesh or route reflection is required for proper route propagation in iBGP networks.

NEW QUESTION # 110
Click the Exhibit button.

Referring to the exhibit, traffic destined to which network will be sent through the tunnel?

• A. 203.0.113.65
• B. 172.20.110.0/24
• C. 198.51.100.1/32
• D. 0.0.0.0/0

Answer: B

Explanation:
The route for 172.20.110.0/24 shows the next hop as the tunnel interface gr-0/0/0.0. This indicates that traffic destined for that prefix will be forwarded through the tunnel. The other route uses a physical interface (ge-0/0/3.0), meaning it is not sent through the tunnel.

NEW QUESTION # 111
Which feature allows Junos OS to perform recursive lookups for static route next hops?

• A. reject
• B. resolve
• C. next-table
• D. discard

Answer: B

Explanation:
In standard routing, astatic routeis typically considered valid only if the specified next-hop IP address is directly reachable on a local subnet. However, in complex service provider designs, the next-hop might be a
"distant" IP address that is reachable through another route (such as a BGP route or another static route). This process of looking up a next-hop within another routing entry is calledrecursive lookup.
In Junos OS, theresolve (Option A)parameter is explicitly used to enable this behavior for static routes.
According to Juniper technical documentation, when you append the resolve keyword to a static route configuration, you are instructing the Routing Engine to search the routing table to find a path to that distant next-hop.
For example:
set routing-options static route 10.1.1.0/24 next-hop 192.168.100.1 resolve If 192.168.100.1 is not on a local interface but is reachable via an OSPF route, the router will "resolve" the path and install the 10.1.1.0/24 route into the forwarding table using the OSPF path's exit interface.
Why other options are incorrect:
* Discard (Option B)andReject (Option C)are "next-hop types" used to drop traffic, either silently (discard) or by sending an ICMP unreachable message (reject).
* Next-table (Option D)is used forInter-VRF routing, where the router is told to look up the destination in a completely different routing instance (like a VRF table), which is a different architectural function than a recursive next-hop lookup within the same table.

NEW QUESTION # 112
What are three default BGP advertisement rules? (Choose three.)

• A. IBGP peers do not advertise routes received from EBGP peers to other IBGP peers.
• B. IBGP peers do not advertise routes received from IBGP peers to other IBGP peers.
• C. IBGP peers advertise routes received from IBGP peers to other IBGP peers.
• D. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
• E. EBGP peers advertise routes learned from IBGP or EBGP peers to other EBGP peers.

Answer: B,D,E

Explanation:
TheBorder Gateway Protocol (BGP)operates based on a strict set of advertisement rules designed to prevent routing loops while ensuring global reachability. These rules differ significantly depending on whether the relationship isExternal BGP (EBGP)orInternal BGP (IBGP).
1. EBGP Advertisement (Option A):In a standard EBGP scenario, a router acts as an exit/entry point for an Autonomous System. When an EBGP speaker receives a valid route from any peer (Internal or External), it will, by default, advertise that route to all of its other EBGP peers. This is the primary mechanism that allows prefixes to propagate across the global internet from one AS to another.
2. IBGP Split Horizon (Option D):
The most critical rule within an AS is theIBGP Split Horizonrule. To prevent loops within an AS, BGP dictates that a route learned from an IBGP peermust notbe advertised to any other IBGP peer. This is why BGP requires a "full mesh" of IBGP sessions or the use ofRoute Reflectorsto ensure all internal routers learn all routes. Without this rule, a route could circulate infinitely within the AS because IBGP does not update the AS_PATH attribute.
3. EBGP to IBGP Propagation (Option B):
When a router learns a route from an EBGP peer, it is permitted to advertise that route to all of its IBGP peers.
This ensures that everyone inside the network knows how to reach external destinations. However, it is important to remember that in Junos OS, theBGP Next Hopis not modified by default when sending routes to IBGP peers, often requiring a "next-hop-self" policy to ensure internal reachability.
Options C and E are incorrect because they directly contradict these fundamental BGP loop-prevention and propagation mechanisms.

NEW QUESTION # 113
The MPLS Label Information Base (LIB) is stored in which table?

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

Answer: D

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 # 114
Which IS-IS packet type will establish and maintain neighbor relationships?

• A. update PDU
• B. hello PDU
• C. link-state PDU
• D. partial sequence number PDU

Answer: B

Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol, communication between routers is performed usingProtocol Data Units (PDUs). To discover neighbors and maintain adjacencies, IS-IS relies on theHello PDU (IIH - IS-IS Hello).
According to Juniper Networks technical documentation, when IS-IS is enabled on an interface, the router begins transmitting Hello PDUs to a multi-destination address (multicast). These PDUs contain essential information such as the router'sSystem ID, its configuredArea Addresses, and itsLevel capability(Level 1, Level 2, or both). For two routers to become neighbors, they must exchange these Hello PDUs and agree on specific parameters, such as the MTU of the link and the hello/hold timers.
Once an adjacency is established, the Hello PDU serves as a "keepalive" mechanism. If a router stops receiving Hello PDUs from a neighbor for a duration exceeding theHolding Time, it assumes the neighbor is down and flushes the associated Link-State PDUs (LSPs) from its database.
To clarify the other options:
* Link-State PDU (Option A):These are used to distribute actual topology and reachability information, not to form adjacencies.
* Partial Sequence Number PDU (Option C):PSNPs are used on point-to-point links to acknowledge the receipt of LSPs or to request missing LSPs.
* Update PDU (Option D):This is not a standard IS-IS term; in IS-IS, updates are handled via the flooding of LSPs.

NEW QUESTION # 115
Click the Exhibit button.

Referring to the exhibit, which two statements are true? (Choose two.)

• A. The default route load-balancing behavior of this router has been modified.
• B. This router will only choose the next hop with a > next to it in the routing table.
• C. This router will choose both next hops in the routing table.
• D. The router is performing default route load-balancing behavior.

Answer: C,D

Explanation:
The routing table shows two equal-cost next hops for the prefix and both are installed in the forwarding table, which means the router is selecting both next hops for forwarding traffic. This indicates equal-cost multipath forwarding.
The forwarding table entry shows a load-balancing group containing both next hops, which reflects the default Junos behavior of performing load balancing across equal-cost paths when multiple next hops exist for the same route.

NEW QUESTION # 116
By default, which MPLS operation is performed by the penultimate router in an LSP on the transport label?

• A. rewrite
• B. swap
• C. pop
• D. push

Answer: C

Explanation:
By default, MPLS uses Penultimate Hop Popping (PHP). The penultimate router removes the transport label before forwarding the packet to the egress router. This pop operation allows the egress router to receive the packet without the outer MPLS label and process it more efficiently.

NEW QUESTION # 117
......

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