JNCIS-SP (JN0-363) Exam Dumps & Questions 2025
JNCIS-SP (JN0-363) Exam Dumps & Questions 2025
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Question 1:
In which situation would you disable penultimate-hop popping?
A. When you want to bypass a penultimate router that does not support IPv6 tunneling
B. When you want to enforce the same class-of-service behavior through the entire LSP
C. When you want to utilize a penultimate router that supports IPv6 tunneling
D. When you want to ensure the penultimate router can perform the destination route lookup
Answer: B
Explanation:
Understanding Penultimate-Hop Popping
Penultimate-hop popping (PHP) is a technique in MPLS where the penultimate hop router (the router before the final destination) removes the top-most MPLS label from a packet before forwarding it to the final destination. This offloads the label swapping process from the final hop router, improving performance and reducing latency.
When to Disable Penultimate-Hop Popping:
You would typically disable PHP in situations where you want to maintain specific QoS or security policies throughout the entire LSP, including the final hop.
Analyzing the Options:
A. When you want to bypass a penultimate router that does not support IPv6 tunneling: This is not a reason to disable PHP. PHP is primarily concerned with MPLS label processing, not IPv6 tunneling.
B. When you want to enforce the same class-of-service behavior through the entire LSP: This is the correct answer. By disabling PHP, you ensure that the final hop router can apply specific QoS policies to the packet, ensuring consistent treatment throughout the LSP.
C. When you want to utilize a penultimate router that supports IPv6 tunneling: This is not a reason to disable PHP. PHP is primarily concerned with MPLS label processing, not IPv6 tunneling.
D. When you want to ensure the penultimate router can perform the destination route lookup: This is not a reason to disable PHP. PHP is designed to offload label processing from the final hop router, not the penultimate hop router.
Therefore, the correct answer is B. When you want to enforce the same class-of-service behavior through the entire LSP.
Question 2:
Which two statements are correct regarding TLVs in IS-IS? (Choose two.)
A. The TLV attributes are time. Length, and variable.
B. PDUs contain different TLVs.
C. The TLV attributes are type, length, and value.
D. TLVs contain different PDUs.
Answer: B and C
Explanation:
B. PDUs contain different TLVs: This is correct because in IS-IS (Intermediate System to Intermediate System), Protocol Data Units (PDUs) contain various TLVs (Type-Length-Value). TLVs are used to encode different pieces of information within the PDUs, allowing the IS-IS protocol to be flexible and extensible.
C. The TLV attributes are type, length, and value: This is correct because TLV stands for Type-Length-Value. These attributes describe the structure of TLVs:
Type: Identifies the kind of information the TLV is carrying.
Length: Specifies the length of the value field.
Value: Contains the actual information.
Incorrect Options:
A. The TLV attributes are time, length, and variable: This is incorrect because the correct attributes for TLV are type, length, and value, not time, length, and variable.
D. TLVs contain different PDUs: This is incorrect because TLVs do not contain PDUs. Instead, PDUs are the overall protocol messages, and they contain different TLVs to convey various pieces of information.
Question 3:
Which two problems occur when increasing numbers of users are added to an Ethernet LAN with no switches present? (Choose two.)
A. The MAC table sizes increase
B. There is unnecessary consumption of network bandwidth
C. There is a greater chance for collisions to occur
D. Some devices will not see certain traffic
Answer: B and C
Explanation:
B. There is unnecessary consumption of network bandwidth: This is correct because in a hub-based Ethernet LAN (without switches), all data frames are broadcasted to all devices on the network. As the number of users increases, this leads to a significant amount of unnecessary traffic, consuming network bandwidth and reducing overall efficiency.
C. There is a greater chance for collisions to occur: This is correct because in a shared Ethernet LAN, all devices compete for the same network medium. As the number of users increases, the likelihood of collisions between data frames also increases, leading to retransmissions and degraded network performance.
Incorrect Options:
A. The MAC table sizes increase: This is incorrect because MAC tables are maintained by switches to map MAC addresses to specific ports. In a network with no switches, there are no MAC tables, so their size is not a factor.
D. Some devices will not see certain traffic: This is incorrect because in a hub-based network, all devices see all traffic. The problem lies in excessive traffic and collisions, not in devices missing certain traffic.
Question 4:
You must establish an MPLS LSP between two locations. You are required to ensure that the LSP traverses specific routers within the network.
Which solution is correct in this scenario?
A. Enable traffic engineering within LDP and define the explicit route the LSP must follow
B. Implement LDP and define the explicit route the LSP must follow
C. Implement RSVP and define the explicit route the LSP must follow
D. Enable traffic engineering within RSVP and enable the Fast Reroute feature
Answer: C
Explanation:
Understanding MPLS LSP Establishment and Traffic Engineering
To establish MPLS LSPs and control their paths, we typically use RSVP-TE (Resource Reservation Protocol – Traffic Engineering). RSVP-TE allows us to define explicit routes for LSPs, ensuring that they follow specific paths within the network.
Analyzing the Options:
A. Enable traffic engineering within LDP and define the explicit route the LSP must follow: LDP is primarily used for label distribution, not for traffic engineering. While LDP can be used for simple LSP setups, it‘s not suitable for complex traffic engineering scenarios.
B. Implement LDP and define the explicit route the LSP must follow: Similar to option A, LDP is not the best choice for traffic engineering.
C. Implement RSVP and define the explicit route the LSP must follow: This is the correct option. RSVP-TE is specifically designed for traffic engineering and allows us to define explicit routes for LSPs.
D. Enable traffic engineering within RSVP and enable the Fast Reroute feature: While Fast Reroute is a useful feature for LSP protection, it‘s not directly related to defining the explicit route of an LSP.
Therefore, the correct answer is C. Implement RSVP and define the explicit route the LSP must follow.
Question 5:
Which two statements ate correct about the BGP next-hop attribute value? (Choose two.)
A. By default, the next-hop value is changed across IBGP links.
B. By default, the next-hop value is changed across EBGP links.
C. By default, the next-hop value is not changed across IBGP links.
D. By default, the next-hop value is not changed across EBGP links.
Answer: A and C
Explanation:
A. By default, the next-hop value is changed across IBGP links: This is correct because, by default, the next-hop attribute value is modified when it passes through an IBGP (Internal BGP) link. This is done to ensure that the next-hop address is reachable within the same autonomous system.
C. By default, the next-hop value is not changed across EBGP links: This is correct because, by default, the next-hop attribute value is not modified when it passes through an EBGP (External BGP) link. The next-hop address remains the same to ensure that it is reachable from an external autonomous system.
Incorrect Options:
B. By default, the next-hop value is changed across EBGP links: This is incorrect because the next-hop value is not changed by default across EBGP links.
D. By default, the next-hop value is not changed across IBGP links: This is incorrect because the next-hop value is indeed changed by default across IBGP links.
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Question 6:
What is the correct description of an Area Border Router (ABR)?
A. An ABR is an OSPF router with links in two areas, connecting OSPF areas to the backbone
B. An ABR is an OSPF router with all of its links within an area
C. An ABR is an OSPF router that injects routing information from outside the OSPF AS
D. An ABR is an OSPF router with at least one link in a Layer 2 area
Answer: A
Explanation:
An ABR is an OSPF router with links in two areas, connecting OSPF areas to the backbone: This is correct because an Area Border Router (ABR) in OSPF (Open Shortest Path First) is responsible for connecting one or more OSPF areas to the OSPF backbone (Area 0). ABRs facilitate the exchange of routing information between different OSPF areas.
Incorrect Options:
B. An ABR is an OSPF router with all of its links within an area: This is incorrect because such a router is known as an internal router, not an ABR. An internal router has all its interfaces within the same OSPF area and does not connect multiple areas.
C. An ABR is an OSPF router that injects routing information from outside the OSPF AS: This is incorrect because a router that injects routing information from outside the OSPF Autonomous System (AS) is known as an Autonomous System Boundary Router (ASBR), not an ABR.
D. An ABR is an OSPF router with at least one link in a Layer 2 area: This is incorrect because the term “Layer 2 area“ is not relevant in the context of OSPF. An ABR specifically connects different OSPF areas, not Layer 2 segments.
Question 7:
What are two methods for decreasing the size of an OSPF link-state database (LSDB)? (Choose two.)
A. Ensure that all routers on a shared segment are configured with a priority value of 0.
B. Use an interface type of p2p when possible.
C. Segment large groups of routers into areas.
D. Change a stub area to NSSA when possible.
Answer: B and C
Explanation:
B. Use an interface type of p2p when possible: This is correct because using point-to-point (p2p) interfaces reduces the number of OSPF adjacencies and the number of link-state advertisements (LSAs) that need to be exchanged. This helps decrease the size of the OSPF LSDB.
C. Segment large groups of routers into areas: This is correct because dividing the OSPF network into multiple areas reduces the amount of information that each router needs to store in its LSDB. Routers within an area only need to maintain detailed information about their own area, while summary information is exchanged between areas, leading to a smaller LSDB in each area.
Incorrect Options:
A. Ensure that all routers on a shared segment are configured with a priority value of 0: This is incorrect because setting the OSPF priority to 0 on all routers prevents them from becoming the designated router (DR) or backup designated router (BDR). This does not directly reduce the size of the LSDB but may impact the network‘s efficiency and resilience.
D. Change a stub area to NSSA when possible: This is incorrect because changing a stub area to a Not-So-Stubby Area (NSSA) does not inherently reduce the size of the LSDB. In fact, it could potentially increase the number of LSAs if the NSSA allows external route advertisements.
Question 8:
You are adding nonforwarding route reflectors to your network. Which three actions ensure that VPN routes are advertised properly? (Choose three.)
A. Add a static default route to inet.3 and/or inet6.3 on the route reflectors.
B. Add the route reflectors to the same IGP domain as their clients.
C. Use rib-groups to add VPN routes to inet.0 and/or inet6.0 on the route reflectors.
D. Use rib-groups to add IGP routes to inet.3 and/or inet6.3 on the route reflectors.
E. Add MPLS LSPs between the route reflectors and their client routers.
Answer: A, D and E
Explanation:
A. Add a static default route to inet.3 and/or inet6.3 on the route reflectors: This is correct because adding a static default route to the inet.3 and/or inet6.3 routing tables on the route reflectors ensures that these devices can properly forward VPN routes. The inet.3 table is used for MPLS routes, and configuring static routes helps maintain reachability for VPN prefixes.
D. Use rib-groups to add IGP routes to inet.3 and/or inet6.3 on the route reflectors: This is correct because using RIB (Routing Information Base) groups to add IGP routes to inet.3 and/or inet6.3 helps ensure that the route reflectors have the necessary routing information to properly handle VPN routes. This allows the route reflectors to leverage IGP routes for forwarding VPN traffic.
E. Add MPLS LSPs between the route reflectors and their client routers: This is correct because MPLS Label Switched Paths (LSPs) are required for the transport of VPN traffic across the network. By establishing LSPs between the route reflectors and their client routers, you ensure that there is an MPLS path for VPN traffic, facilitating proper route advertisement and traffic forwarding.
Incorrect Options:
B. Add the route reflectors to the same IGP domain as their clients: This is incorrect because while it is beneficial for route reflectors to be in the same IGP domain as their clients for optimal routing, this action alone does not ensure that VPN routes are advertised properly. The other actions (A, D, E) are more critical for VPN route advertisement.
C. Use rib-groups to add VPN routes to inet.0 and/or inet6.0 on the route reflectors: This is incorrect because adding VPN routes to inet.0 and/or inet6.0 is not necessary for proper VPN route advertisement. VPN routes are typically handled in the inet.3 and inet6.3 tables. The focus should be on ensuring that these tables have the correct routing information.
Question 9:
Which two fields of a hello packet must match on both routers when forming an OSPF adjacency? (Choose two.)
A. Hello interval
B. Designated route
C. Router priority
D. Network mask
Answer: A and D
Explanation:
A. Hello interval: Both routers must agree on the frequency of sending Hello packets to maintain the neighbor relationship.
D. Network mask: Both routers must have the same network mask for the interface on which the neighbor relationship is being established.
Incorrect Options:
B. Designated route: The Designated Router (DR) and Backup Designated Router (BDR) are elected within a multi-access network to reduce the number of neighbor relationships. They are not required to match on both routers for basic neighbor adjacency.
C. Router priority: While Router Priority is used to elect the DR and BDR, it‘s not a strict requirement for neighbor adjacency. As long as the other parameters match, neighbor relationships can form even if the router priorities differ.
Therefore, to form an OSPF adjacency, the two routers must have matching Hello intervals and network masks on the interfaces involved in the neighbor relationship.
Question 10:
In an IS-IS network, which device represents the pseudo-node?
A. an area border router
B. a router connected to the backbone
C. a router with an IS-IS export policy
D. a designated intermediate system
Answer: D
Explanation:
Correct Option:
D. a designated intermediate system (DIS): In an IS-IS network, the DIS is responsible for managing the topology information base (TIB) for a specific level. It acts as a central point for collecting and distributing topology information within the network. The DIS is essentially a pseudo-node that represents the entire level.
Incorrect Options:
A. an area border router: Area Border Routers (ABRs) are responsible for routing traffic between different IS-IS areas. They are not pseudo-nodes.
B. a router connected to the backbone: A router connected to the backbone is simply a router that is part of the backbone area. It does not represent a pseudo-node.
C. a router with an IS-IS export policy: An IS-IS export policy is used to control which routes are advertised to other IS-IS areas. This does not make the router a pseudo-node.
For a full set of 400 questions. Go to
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SkillCertPro offers detailed explanations to each question which helps to understand the concepts better.
It is recommended to score above 85% in SkillCertPro exams before attempting a real exam.
SkillCertPro updates exam questions every 2 weeks.
You will get life time access and life time free updates
SkillCertPro assures 100% pass guarantee in first attempt.