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Juniper Service Provider, Professional (JNCIP-SP) 認定 JN0-664 試験問題 (Q30-Q35):

質問 # 30
In which two ways does OSPF prevent routing loops in multi-area networks? (Choose two.)

A. The SPF algorithm prunes looped paths within an area.
B. All areas are required to connect as a full mesh.
C. All areas are required to connect to area 0.
D. The LFA algorithm prunes all looped paths within an area.

正解：A、C

解説：
Explanation
OSPF is an interior gateway protocol that uses link-state routing to exchange routing information among routers within a single autonomous system. OSPF prevents routing loops in multi-area networks by using two methods: area hierarchy and SPF algorithm. Area hierarchy is the concept of dividing a large OSPF network into smaller areas that are connected to a backbone area (area 0). This reduces the amount of routing information that each router has to store and process, and also limits the scope of link-state updates within each area. All areas are required to connect to area 0 either directly or through virtual links2. SPF algorithm is the method that OSPF uses to calculate the shortest path to each destination in the network based on link-state information. The SPF algorithm runs on each router and builds a shortest-path tree that represents the topology of the network from the router's perspective. The SPF algorithm prunes looped paths within an area by choosing only one best path for each destination3.
References: 2:
https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/concept/ospf-area-overview.html 3:
https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/concept/ospf-spf-algorithm-overview.ht

質問 # 31
Exhibit

Referring to the exhibit, which statement is correct?

A. The route-distinguisher configuration will allow overlapping routes to be shared between CE-1 and CE-2.
B. The vrf-target configuration will stop routes from being shared between CE-1 and CE-2.
C. The vrf-target configuration will allow routes to be shared between CE-1 and CE-2.
D. The route-diatinguisher configuration will stop routes from being shared between CE-1 and CE-2.

正解：A

解説：
The route distinguisher (RD) is a BGP attribute that is used to create unique VPN IPv4 prefixes for each VPN in an MPLS network. The RD is a 64-bit value that consists of two parts: an administrator field and an assigned number field. The administrator field can be an AS number or an IP address, and the assigned number field can be any arbitrary value chosen by the administrator. The RD is prepended to the IPv4 prefix to create a VPN IPv4 prefix that can be advertised across the MPLS network without causing any overlap or conflict with other VPNs. In this question, we have two PE routers (PE-1 and PE-2) that are connected to two CE devices (CE-1 and CE-2) respectively. PE-1 and PE-2 are configured with VRFs named Customer-A and Customer-B respectively.

質問 # 32
Which two statements about IS-IS are correct? (Choose two.)

A. PSNPs are flooded periodically.
B. CSNPs contain only descriptions of LSPs.
C. CSNPs are flooded periodically.
D. PSNPs contain only descriptions of LSPs.

正解：C、D

質問 # 33
Exhibit

R4 is directly connected to both RPs (R2 and R3) R4 is currently sending all ,o,ns upstream to R3 but you want all joins to go to R2 instead Referring to the exhibit, which configuration change will solve this issue?

A. Change the group-range to be more specific on R2 than R3.
B. Change the local address on R2 to be higher than R3.
C. Change the default route in inet.2 on R4 from R3 as the next hop to R2
D. Change the bootstrap priority on R2 to be higher than R3

正解：A

解説：
The issue arises because R3's group-range (224.1.1.0/28) is more specific than R2's group-range (224.1.1.0
/24). In PIM bootstrap (BSR), the RP with the longest prefix (most specific group-range) is preferred, regardless of priority. Even though R3 has a higher bootstrap priority (210 vs. R2's 200), its more specific
/28 group-range takes precedence for groups within 224.1.1.0/28.
Why Option D is Correct:
* To force R4 to use R2 for all joins, R2's group-range must be more specific than R3's. For example:
* If R2's group-range is changed to 224.1.1.0/28 (same as R3) but with a higher priority, R2 would win (priority is compared only when group-ranges are equal).
* If R2's group-range is changed to 224.1.1.0/29 (more specific than /28), it will override R3's
/28 for groups in the /29 range.
* The key is prefix specificity, which overrides priority in BSR elections.
Why Other Options Are Incorrect:
* A. Change bootstrap priority on R2 to be higher than R3:
* Priority is evaluated only when group-ranges are identical. Since R3's group-range (/28) is more specific than R2's (/24), R3 will still win for groups in 224.1.1.0/28, even if R2's priority is higher.
* B. Change the default route in inet.2 on R4:
* RPF routes (inet.2) determine how traffic reaches the RP, but they do not influence RP election logic (BSR priority/group-range).
* C. Change R2's local address to be higher than R3's:
* The RP address is a tiebreaker only if priorities and group-ranges are equal. Since R3's group- range is more specific, this change has no impact.
Key Takeaways:
* BSR RP Election Order:
* Longest group prefix (most specific).
* Highest priority (if prefixes are equal).
* Highest RP address (if prefixes and priorities are equal).
* To override R3, R2 must advertise a more specific group-range (e.g., /28 or smaller) to ensure it is selected for the desired multicast groups.

質問 # 34
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. By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3.
D. The next-hop value for these routes is changed by ISP-A before being sent to R3.

正解：A、D

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.
# 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 # 35
......

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Juniper Service Provider, Professional (JNCIP-SP) 認定 JN0-664 試験問題 (Q30-Q35):

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