[2026] Pass Key features of JN0-364 Course with Updated 180 Questions
JN0-364 Sample Practice Exam Questions 2026 Updated Verified
NEW QUESTION # 94
You are asked to create connections between routing instances on the same Junos device and route between the connected Instances. What are two ways to accomplish this task? (Choose two.)
- A. Use physical interfaces.
- B. Use loopback interfaces.
- C. Use an IRB interface.
- D. Use logical tunnel interfaces.
Answer: B,D
Explanation:
To create connections between routing instances on the same Junos device and route between them, you can use logical tunnel interfaces, which are virtual interfaces that can be used to route traffic between instances without the need for physical connectivity. Additionally, loopback interfaces, which represent the device itself, can be used to route traffic between routing instances as they are always up and can be reached within the device.
NEW QUESTION # 95
Which statement about RSVP-signaled LSPs is correct?
- A. CSPF is not required for LSPs using admin-groups.
- B. CSPF is used to calculate the path for a traffic-engineered LSP.
- C. The paths used by LSPs are always calculated using the SRGB.
- D. The paths used by LSPs are always calculated using the TED.
Answer: B
Explanation:
RSVP traffic-engineered LSPs use constraint-based shortest path first (CSPF) to compute a path that satisfies TE constraints such as bandwidth, metrics, and administrative groups. The resulting path is then signaled hop-by-hop using RSVP.
NEW QUESTION # 96
You are implementing traffic engineering in your MPLS network. You must ensure that the MPLS routes are used to traverse your network. Your solution should not affect IGP routes in your route tables.
In this scenario, which traffic engineering setting will accomplish this behavior?
- A. bgp
- B. bgp-igp
- C. bgp-igp-both-ribs
- D. mpls-forwarding
Answer: D
Explanation:
To ensure that MPLS traffic-engineered routes are used without affecting IGP routes in the route tables, the mpls-forwarding traffic engineering setting should be used. This setting allows MPLS to influence forwarding without changing the IGP route selection.
NEW QUESTION # 97
You are deploying link aggregation groups. By default, what are two considerations in this scenario? (Choose two.)
- A. There should only be four member links per LAG.
- B. All the ports must have the same speed.
- C. Member links are required to be contiguous ports.
- D. Member links can reside on different members within an MC-LAG.
Answer: B,D
Explanation:
When deploying Link Aggregation Groups (LAGs), two key default considerations are:
All member ports must have the same speed. This ensures consistent performance and proper aggregation since mismatched speeds can cause issues in traffic distribution and link stability.
Member links can reside on different members within a Multi-Chassis LAG (MC-LAG). MC-LAG allows member links of the aggregation group to be spread across different physical chassis, providing redundancy and load sharing across devices.
NEW QUESTION # 98
In IS-IS, what would you use to control which external routes are installed in the routing table?
- A. export policy
- B. route preference
- C. interface metric
- D. import policy
Answer: D
Explanation:
An import policy is used to control which routes learned from a routing protocol are accepted into the routing table. In IS-IS, applying an import policy allows the router to filter or modify external routes before they are installed in the routing table.
NEW QUESTION # 99
Which two statements are correct about the way that BGP propagates routes by default?
(Choose two.)
- A. A route learned by IBGP will be re-advertised to IBGP peers.
- B. A route learned by IBGP will not be re-advertised lo IBGP peers.
- C. A route learned by EBGP will be re-advertised to IBGP peers.
- D. A route learned by EBGP will not be re-advertised to IBGP peers.
Answer: B,C
Explanation:
By default, BGP will propagate routes learned from EBGP peers to other IBGP peers. However, due to the BGP split-horizon rule, routes learned from one IBGP peer are not re-advertised to another IBGP peer. This behavior is designed to prevent routing information loops within the same AS.
NEW QUESTION # 100
What are two bridging concepts that are used to maintain an Ethernet switching table? (Choose two.)
- A. exporting
- B. learning
- C. timing
- D. aging
Answer: B,D
Explanation:
In Ethernet switching, learning and aging are two fundamental concepts for maintaining a dynamic Ethernet switching table (also known as a MAC address table). Learning is the process by which switches listen for frames and learn the MAC addresses by associating them with the incoming port. Aging is the mechanism that ensures the switch updates its table by removing MAC addresses that have not been seen for a certain amount of time (aging time).
NEW QUESTION # 101
By default, which routing table contains a list of all ingress LSPs?
- A. inet.2
- B. inet.0
- C. inet.1
- D. inet.3
Answer: D
Explanation:
In the Juniper Networks Junos operating system, the management of routing information is partitioned into several distinct routing tables (RIBs), each serving a specific architectural purpose. When dealing with Multiprotocol Label Switching (MPLS), understanding the distinction between inet.0 and inet.3 is fundamental for troubleshooting and traffic engineering.
Theinet.3routing table is specifically designed to store the egress IPv4 addresses ofLabel-Switched Paths (LSPs). When an ingress router successfully establishes an LSP (via RSVP or LDP), it places the host address of the egress router (the tail-end) into the inet.3 table. This table is not used for general packet forwarding; instead, it is primarily used by theBorder Gateway Protocol (BGP)for next-hop resolution. When BGP receives a route, it checks both inet.0 and inet.3 to resolve the next hop. If a matching entry exists in inet.3, the router knows it can reach that destination via an MPLS tunnel, allowing for the encapsulation of BGP traffic within MPLS.
In contrast,inet.0is the default unicast routing table used for standard IPv4 forwarding and contains routes learned via IGPs (OSPF, IS-IS) or static routing.inet.1is utilized for multicast forwarding (MBGP), andinet.2 is typically used for Multicast Source Discovery Protocol (MSDP) or RPF checks in multicast environments.
By isolating LSP egress points in inet.3, Junos prevents MPLS-specific paths from interfering with standard IGP path selection unless the administrator explicitly chooses to merge them (e.g., using the traffic- engineering bgp-igp command). Therefore, by default, the ingress router maintains its list of reachable LSP endpoints in inet.3.
NEW QUESTION # 102
Click the Exhibit button.
Referring to the exhibit, R1 and R2 are configured to run IS-IS. The IS-IS adjacency between R1 and R2 is up.
What does the output of the show isis interfacecommand tell you about R1?
- A. R1 is not configured to use wide metrics.
- B. R1 only forms a Level 2 adjacency with R2.
- C. R1 advertises a Level 1 metric of 100 and a Level 2 metric of 100 toward R2 in its link-state PDU
- D. R1 sends Level 1 hello PDUs to R2.
Answer: B
Explanation:
The interface output shows Level 1 is disabled on ge-0/0/0.0 while Level 2 is operating as point- to-point. This indicates R1 is forming only a Level 2 IS-IS adjacency with R2 on that link.
NEW QUESTION # 103
Which two statements about the BGP path selection process are correct? (Choose two.)
- A. BGP selects the advertisement with the numerically highest ME
- B. BGP selects the advertisement with the numerically highest local preference.
- C. BGP selects the advertisement with the numerically lowest local preference.
- D. BGP selects the advertisement with the numerically lowest ME
Answer: B,D
NEW QUESTION # 104
Click the Exhibit button.
Referring to the exhibit, R1 and R2 are advertising the same prefix 203.0.113.0/24 to R3 and R4 over EBGP. R3 and R4 both advertise this prefix to R5.
Which advertisement does R5 choose to install in its routing table?
- A. The advertisements from both R3 and R4. but R3 is chosen for forwarding.
- B. The advertisement from R4 is chosen.
- C. The advertisement from R3 is chosen.
- D. The advertisements from both R3 and R4. but R4 is chosen for forwarding.
Answer: B
Explanation:
R3 and R4 both advertise the same prefix into iBGP toward R5, but they assign different local preference values. R3 sets a local preference of 150, while R4 sets a local preference of 200.
Since BGP selects routes with the highest local preference before considering other attributes, R5 chooses the route received from R4 and installs it in its routing table.
NEW QUESTION # 105
You are using EBGP to connect to two upstream peers in the same AS. You want to make one of the links less preferred for traffic entering your network from the peer's AS.
Which feature should you use to achieve this goal?
- A. a route reflector
- B. origin code
- C. local preference
- D. AS-path prepending
Answer: D
Explanation:
AS-path prepending artificially lengthens the AS-path attribute by adding additional instances of the local AS number when advertising routes to a specific external peer. Because BGP prefers routes with shorter AS paths, the upstream AS will consider the prepended path less attractive and will prefer the other link when sending traffic toward the network.
NEW QUESTION # 106
Which two statements are correct about TLVs in IS-IS? (Choose two.)
- A. LSPs can only contain one TLV.
- B. LSPs can contain multiple TLVs.
- C. TLVs allow flexible encoding of routing information.
- D. TLVs only support encoding IPv4 routing information.
Answer: B,C
Explanation:
In the IS-IS protocol,TLVs (Type, Length, Value)are the fundamental building blocks used to carry information withinLink-State PDUs (LSPs). Unlike some other protocols that have a fixed, rigid packet format, IS-IS was designed from the ground up to be modular and extensible. This extensibility is achieved through the use of TLVs, which allow the protocol to carry different types of data without requiring changes to the core protocol state machine.
According to Juniper Networks technical documentation,TLVs allow flexible encoding of routing information (Option C). Each TLV specifies the "Type" of information it carries (such as neighbor information or IP reachability), the "Length" of that information, and the "Value" (the actual data). This architecture is what allowed IS-IS to easily support IPv6 by simply adding new TLVs (like TLV 236 for IPv6 reachability) without redesigning the protocol. It also supports Traffic Engineering (TE) extensions used in MPLS environments by adding TLVs that describe link bandwidth and administrative groups.
Furthermore, a singleLSP can contain multiple TLVs (Option D). When a Juniper router generates an LSP, it packs all the necessary information-such as the router's area addresses, its neighbors, and its local interface prefixes-into various TLVs and places them into a single PDU. If the amount of information exceeds the Maximum Transmission Unit (MTU) of the interface, the router will generate additional LSPs (fragmented LSPs) to carry the remaining TLVs.
Options A and B are incorrect because restricting an LSP to a single TLV would make the protocol incredibly inefficient, and the very nature of IS-IS is its ability to support multiple network layer protocols (not just IPv4) through its agnostic TLV-based transport.
NEW QUESTION # 107
Which term describes the router where traffic enters an MPLS label-switched path (LSP)?
- A. ingress router
- B. egress router
- C. penultimate router
- D. transit 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 # 108
How are routing loops prevented in external BGP networks?
- A. Routing policies must be used to drop looped routes.
- B. By default, a router receiving a route with its own AS in the AS Path attribute will not use the route.
- C. By default, a router receiving a route with its own AS in the AS Path attribute will use the route.
- D. Routing policies must be used to accept valid routes.
Answer: B
Explanation:
BGP is apath-vector protocol, and its primary mechanism for ensuring a loop-free topology across the global internet is theAS_PATHattribute. This attribute is a "well-known mandatory" attribute that records every Autonomous System (AS) a prefix has passed through.
According to Juniper Networks Service Provider documentation, the loop prevention rule forExternal BGP (EBGP)is straightforward: when a router receives a BGP Update from an EBGP peer, it examines the AS_PATH list. If the router's ownlocal AS numberis already present in the list, it indicates that the advertisement has already traversed the local AS and has returned. To prevent a routing loop, the routerwill not use the routeand will implicitly discard the update (Option D).
This behavior is a default, hard-coded function of the BGP protocol and does not require the administrator to write manualrouting policies(Options B and C) to achieve basic loop prevention. While there are advanced features like as-path-expand or allow-as-in that can modify this behavior for specific design requirements (such as in certain Hub-and-Spoke MPLS VPN topologies), the standard operational default is to reject any route where the local AS is detected in the path. This ensures that traffic does not circulate infinitely between Autonomous Systems.
NEW QUESTION # 109
By default, which MPLS operation is performed by the penultimate router in an LSP on the transport label?
- A. pop
- B. push
- C. rewrite
- D. swap
Answer: A
Explanation:
In a Multiprotocol Label Switching (MPLS) environment, label operations are categorized into three primary actions:Push(adding a label),Swap(replacing a label), andPop(removing a label). The specific behavior described in the question refers to a mechanism calledPenultimate Hop Popping (PHP).
According to Juniper Networks technical documentation, the goal of PHP is to improve forwarding efficiency at the egress point of a Label-Switched Path (LSP). TheEgress Label Edge Router (LER), which is the final destination for the LSP, would normally have to perform two lookups if it received a labeled packet: first, it would look up the label in its MPLS table to see it is the destination, and second, it would look up the underlying IP payload in its IP routing table (inet.0) to forward the packet.
To alleviate this burden, the Egress LER signals a special label value calledImplicit Null (Label 3)to its upstream neighbor (the penultimate router) during the signaling process (RSVP or LDP). When the penultimate routerreceives a packet destined for that egress LER, it sees the instruction to pop the transport label. Consequently, the penultimate router performs aPopoperation, stripping away the outer MPLS label and sending the raw IP packet (or the remaining inner service label) to the Egress LER.
This allows the Egress LER to perform only a single lookup. If the transport label was the only label, the Egress LER simply performs a standard IP lookup. If there is a VPN label remaining, it performs a single MPLS lookup for the VRF. This "default" behavior in Junos OS optimizes the performance of the egress router by offloading the final label removal to the penultimate hop. Note that ifUltimate Hop Popping (UHP) were configured (via the explicit-null command), the penultimate router would perform aSwapto Label 0 instead of a Pop.
NEW QUESTION # 110
Which IPv6 extension header is used to specify intermediate nodes for a packet's path?
- A. destination options
- B. routing
- C. hop-by-hop options
- D. fragment
Answer: B
Explanation:
In the IPv6 architecture, the base header is kept at a fixed size of 40 bytes to streamline processing. Any additional features or options are handled byExtension Headers, which are inserted between the IPv6 header and the upper-layer protocol. According to Juniper Networks technical documentation and RFC 8200, when a source node needs to list one or more intermediate nodes to be "visited" on the way to the final destination, it utilizes theRouting extension header (Option B).
The Routing header is functionally similar to the "Source Route" option in IPv4. When a packet contains a Routing header, it is addressed to the first intermediate node listed in the header. That node examines the header, swaps its own address with the next address in the list, and forwards the packet. This process continues until the packet reaches the final destination. This is a foundational component for technologies like Segment Routing over IPv6 (SRv6), where the Routing header (specifically the Segment Routing Header or SRH) is used to steer traffic through a specific set of service instructions or nodes.
To distinguish this from the other options:
* Hop-by-hop options (Option A):These carry information that must be examined byeverynode along the path (such as Router Alert), not just specific intermediate nodes.
* Fragment (Option C):This is used only when the source node needs to fragment a packet that exceeds the path MTU.
* Destination options (Option D):These carry optional information intended specifically for the destination node (or nodes listed in a Routing header), but they do not dictate the path themselves.
NEW QUESTION # 111
You want to see a detailed list of all established BGP sessions. In this scenario, what would be a valid command to accomplish this task?
- A. show bgp neighbor
- B. show rouse protocol bgp
- C. show bgp summary
- D. show rouse receive-protocol bgp <neighbor IP address>
Answer: A
Explanation:
The show bgp neighbor command in Junos OS provides a detailed description of each BGP session, including session state, options configured, and counters for messages sent and received. This is the command you would use to see a detailed list of all established BGP sessions.
NEW QUESTION # 112
Click the Exhibit button.
All devices in the network are configured correctly and the path requirements are valid.
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The secondary LSP using the any-pathpath will be signaled, and its state will be up.
- B. The secondary LSP using the via-R2-R4path will not be signaled, and its state will be down.
- C. The secondary LSP using the via-R2-R4path will be signaled, and its state will be up.
- D. The secondary LSP using the any-pathpath will not be signaled, and its state will be down.
Answer: C,D
NEW QUESTION # 113
You have configured graceful RE switchover (GRES), however you cannot complete the show system switchover command.
Referring to the exhibit, what is the problem?
- A. The command is only available if non-stop routing is enabled.
- B. The command is only available If a backup router is configured.
- C. The command is only available If graceful restart is enabled.
- D. The command is only available on the backup Routing Engine.
Answer: A
Explanation:
The show system switchover command is used to display the status of the Graceful Routing Engine Switchover (GRES) feature. This command is available when nonstop routing (NSR) is enabled, which works in conjunction with GRES to maintain uninterrupted routing in case of a Routing Engine switchover.
NEW QUESTION # 114
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