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Juniper Service Provider, Professional (JNCIP-SP) 認定 JN0-664 試験問題 (Q12-Q17):

質問 # 12
Exhibit.

Referring to the exhibit, which path would traffic passing through R1 take to get to R4?

A. R1 -> R2 -> R4
B. R1 -> R4
C. R1 -> R2 -> R3 -> R4
D. R1 -> R3 -> R4

正解：A

解説：
The OSPF cost is carried in the LSAs that are exchanged within an OSPF area. When a router calculates the cost to a destination it uses the cost of the exit interface of each router in the path to the destination.

質問 # 13
Which statement is correct about IS-IS when it performs the Dijkstra algorithm?

A. The algorithm will stop processing once the tree database is empty.
B. When a new neighbor ID in the tree database matches a router ID in the LSDB, the neighbor ID is moved to the candidate database
C. Tuples with the lowest cost are moved from the tree database to the LSDB.
D. The local router moves its own local tuples into the candidate database

正解：D

解説：
IS-IS is a link-state routing protocol that uses the Dijkstra algorithm to compute the shortest paths between nodes in a network. The Dijkstra algorithm maintains three data structures: a tree database, a candidate database, and a link-state database (LSDB). The tree database contains the nodes that have been visited and their shortest distances from the source node. The candidate database contains the nodes that have not been visited yet and their tentative distances from the source node. The LSDB contains the topology information of the network, such as the links and their costs.
The Dijkstra algorithm works as follows:
The local router moves its own local tuples into the tree database. A tuple consists of a node ID, a distance, and a parent node ID. The local router's tuple has a distance of zero and no parent node.
The local router moves its neighbors' tuples into the candidate database. The neighbors' tuples have distances equal to the costs of the links to them and parent node IDs equal to the local router's node ID.
The local router selects the tuple with the lowest distance from the candidate database and moves it to the tree database. This tuple becomes the current node.
The local router updates the distances of the current node's neighbors in the candidate database by adding the current node's distance to the link costs. If a shorter distance is found, the parent node ID is also updated.
The algorithm repeats steps 3 and 4 until either the destination node is reached or the candidate database is empty.

質問 # 14
Exhibit

CE-1 and CE-2 are part of a VPLS called Customer1 No connectivity exists between CE-1 and CE-2. In the process of troubleshooting, you notice PE-1 is not learning any routes for this VPLS from PE-2, and PE-2 is not learning any routes for this VPLS from PE-1.

A. The route target must match on PE-1 and PE-2.
B. The route distinguisher must match on PE-1 and PE-2.
C. The no-tunnel-services statement should be deleted on both PEs.
D. The instance type should be changed to I2vpn.

正解：A

解説：
VPLS is a technology that provides Layer 2 VPN services over an MPLS network. VPLS uses BGP as its control protocol to exchange VPN membership information between PE routers. The route target is a BGP extended community attribute that identifies which VPN a route belongs to. The route target must match on PE routers that participate in the same VPLS instance, otherwise they will not accept or advertise routes for that VPLS.

質問 # 15
Exhibit

Click the Exhibit button-Referring to the exhibit, which two statements are correct about BGP routes on R3 that are learned from the ISP-A neighbor? (Choose two.)

A. The BGP local-preference value that is used by ISP-A is not advertised to R3.
B. All BGP attribute values must be removed before receiving the routes.
C. The next-hop value for these routes is changed by ISP-A before being sent to R3.
D. By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3.

正解：A、C

解説：
Analyzing the Exhibit
The diagram represents BGP peering between:
AS 65512 (Enterprise Network)
AS 65511 (ISP-A)
R3 and R4 are peering with ISP-A using EBGP.
R1, R2, R3, and R4 are peering within AS 65512 using IBGP.
Understanding BGP Route Behavior
Option A: "By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3." ❌ Incorrect!
EBGP behavior: When a BGP route is advertised via EBGP, the next-hop IP is changed to the router's own IP by default.
Since ISP-A is advertising routes via EBGP to R3, the next-hop is changed to ISP-A's IP.
Thus, this statement is incorrect.
Option B: "The BGP local-preference value that is used by ISP-A is not advertised to R3." ✅ Correct!
BGP Local Preference (LOCAL_PREF) is an IBGP-only attribute.
Local Preference is NOT shared over EBGP because it is used within an AS to influence route selection.
ISP-A will not send LOCAL_PREF to R3, as R3 is in a different AS.
Thus, this statement is correct.
Option C: "All BGP attribute values must be removed before receiving the routes." ❌ Incorrect!
BGP does not remove all attributes when advertising routes. Some attributes are modified (e.g., next-hop, AS-PATH), but others (like MED, community) may be preserved.
Thus, this statement is incorrect.
Option D: "The next-hop value for these routes is changed by ISP-A before being sent to R3." ✅ Correct!
As per default EBGP behavior, the next-hop is changed when a route is advertised to an EBGP peer.
This means ISP-A changes the next-hop to its own IP before sending it to R3.
Thus, this statement is correct.
Final answer:
✅ B. The BGP local-preference value that is used by ISP-A is not advertised to R3.
✅ D. The next-hop value for these routes is changed by ISP-A before being sent to R3.
Verification from Juniper Documentation:
Juniper BGP Configuration Guide confirms that LOCAL_PREF is not advertised over EBGP.
RFC 4271 (BGP-4) specifies that next-hop is changed by default when advertising routes via EBGP.

質問 # 16
Which two statements are correct regarding the PIM DR in a PIM-SM domain? (Choose two.)

A. If the DR priorities match, the router with the lowest IP address is selected as the DR.
B. The source DR sends PIM register messages from the source network to the RP.
C. By default, PIM DR election is performed on point-to-point links.
D. The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.

正解：B、D

解説：
In PIM-SM (Protocol Independent Multicast - Sparse Mode), the Designated Router (DR) plays a crucial role in multicast forwarding. The DR is responsible for various tasks depending on whether it is connected to the source or the receiver. Let's analyze each statement regarding the PIM DR in a PIM-SM domain.
1. **Statement A: The source DR sends PIM register messages from the source network to the RP.**
- Correct. In PIM-SM, the DR on the source's local network is responsible for encapsulating multicast packets in PIM Register messages and sending them to the Rendezvous Point (RP). This process ensures that the RP is aware of active sources.
2. **Statement B: If the DR priorities match, the router with the lowest IP address is selected as the DR.**
- Incorrect. The correct rule is that if the DR priorities match, the router with the **highest** IP address is selected as the DR. The election process first compares priorities; if priorities are equal, the IP addresses are compared to select the DR.
3. **Statement C: The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.**
- Correct. In PIM-SM, the DR on the receiver's local network sends PIM Join messages toward the RP to join the multicast distribution tree. Similarly, it sends PIM Prune messages to leave the tree when there are no interested receivers.
4. **Statement D: By default, PIM DR election is performed on point-to-point links.**
- Incorrect. By default, PIM DR election is performed on multi-access networks (e.g., Ethernet). On point-to-point links, there is no need for a DR election as there are only two routers involved.
**Conclusion**:
The correct statements regarding the PIM DR in a PIM-SM domain are:
**A. The source DR sends PIM register messages from the source network to the RP.**
**C. The receiver DR sends PIM join and PIM prune messages from the receiver network toward the RP.**
**References**:
- Juniper Networks Documentation on PIM-SM: [PIM-SM
Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/pim-sparse-mode-overview.html
- RFC 7761, Protocol Independent Multicast - Sparse Mode (PIM-SM): [RFC
7761](https://tools.ietf.org/html/rfc7761) which details the PIM-SM protocol, including DR roles and election procedures.

質問 # 17
......

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試験の準備方法-完璧なJN0-664関連資料試験-認定するJN0-664最新試験情報

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検証する-一番優秀なJN0-664関連資料試験-試験の準備方法JN0-664最新試験情報

JN0-664試験の準備方法｜更新するJN0-664関連資料試験｜検証するService Provider, Professional (JNCIP-SP)最新試験情報

Juniper Service Provider, Professional (JNCIP-SP) 認定 JN0-664 試験問題 (Q12-Q17):

試験の準備方法-完璧なJN0-664関連資料試験-認定するJN0-664最新試験情報

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