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Juniper Service Provider, Professional (JNCIP-SP) 認定 JN0-664 試験問題 (Q42-Q47):

質問 # 42
You enabled a new router (R3) in your network but all destinations using IS-IS routes are not properly load balancing over this new router.
Referring to the exhibit, what is the problem?

A. R1 does not have wide-metrics enabled.
B. R2 is missing internal routes for R1.
C. R1 is missing internal routes for R2.
D. R3 does not have wide-metrics enabled.

正解：D

質問 # 43
Exhibit

Referring to the exhibit, PE-1 and PE-2 are getting route updates for VPN-B when neither of them service that VPN Which two actions would optimize this process? (Choose two.)

A. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the RR.
B. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the PEs.
C. Configure the family route-target statement on the RR.
D. Configure the family route-target statement on the PEs.

正解：A、C

解説：
BGP route target filtering can be configured on PE devices or on route reflectors (RRs). Configuring BGP route target filtering on RRs is more efficient and scalable, as it reduces the number of BGP sessions and updates between PE devices. To configure BGP route target filtering on RRs, the following steps are required:
Configure the family route-target statement under the BGP group or neighbor configuration on the RRs. This enables the exchange of the route-target address family between the RRs and their clients (PE devices).
Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement under the routing-options configuration on the RRs. This enables the RRs to resolve next hops for VPN routes using the inet.0 routing table.

質問 # 44
Exhibit

Which two statements about the configuration shown in the exhibit are correct? (Choose two.)

A. This VPN connects customer sites that use different AS numbers.
B. A Layer 2 VPN is configured.
C. This VPN connects customer sites that use the same AS number
D. A Layer 3 VPN is configured.

正解：C、D

解説：
The provided configuration is for a routing instance named VPN-A on a Juniper PE (Provider Edge) router. Let's break it down:
* Instance Type: VRF
* The instance-type vrf; statement indicates that this is a Layer 3 VPN (L3VPN) using MPLS VPNs (RFC 4364 - BGP/MPLS IP VPNs).
* This confirms that Option D (A Layer 3 VPN is configured) is correct #.
* VRF Target and Interface Association
* The vrf-target target:64512:1234; defines the route target (RT) for importing and exporting VPN routes.
* The interface ge-0/0/1.0; binds this interface to the VRF.
* BGP Configuration for CE (Customer Edge) Peering
* The group CE section configures external BGP (EBGP) (type external;).
* The neighbor 10.0.0.1 is in AS 64512 (peer-as 64512;).
* The as-override; statement is used.
Evaluating the Answer Choices
# Option B: "This VPN connects customer sites that use the same AS number."
* The as-override; command allows multiple customer sites that use the same AS number (64512) to communicate over the service provider's MPLS network.
* Normally, BGP prevents routes with the same AS in the AS_PATH from being accepted. The as- override feature replaces the customer's AS number with the provider's AS, ensuring proper route advertisement.
# This statement is correct.
# Option A: "This VPN connects customer sites that use different AS numbers."
* If the customer sites had different AS numbers, there would be no need for as-override.
* The as-override feature is specifically used when all customer sites share the same AS number, ensuring that BGP routes are accepted.
# This statement is incorrect.
# Option C: "A Layer 2 VPN is configured."
* A Layer 2 VPN (L2VPN) configuration would typically use instance-type l2vpn; or EVPN/VPLS- related parameters (e.g., protocols l2vpn or protocols vpls).
* Since this configuration uses instance-type vrf; and BGP with a VRF target, it is clearly a Layer 3 VPN (L3VPN).
# This statement is incorrect.
# Option D: "A Layer 3 VPN is configured."
* The instance-type vrf; confirms this is an MPLS Layer 3 VPN (L3VPN).
* VRFs, BGP, and route targets (vrf-target) are specific to Layer 3 VPNs.
# This statement is correct.
# B. This VPN connects customer sites that use the same AS number.
# D. A Layer 3 VPN is configured.
Verification from Juniper Documentation:
* Juniper BGP/MPLS Layer 3 VPNs Guide confirms that instance-type vrf is used for L3VPNs.
* Juniper BGP Configuration Guide states that as-override is applied when customer sites use the same AS number.
* RFC 4364 (BGP/MPLS IP VPNs) explains how route targets and VRFs are used in L3VPN deployments.

質問 # 45
In IS-IS. which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two.)

A. On the multi-access network, each router forms an adjacency to every other router on the segment.
B. A router with a priority of 10 wins the DIS election over a router with a priority of 1.
C. On the multi-access network, each router only forms an adjacency to the DIS.
D. A router with a priority of 1 wins the DIS election over a router with a priority of 10.

正解：A、B

質問 # 46
A packet is received on an interface configured with transmission scheduling. One of the configured queues In this scenario, which two actions will be taken by default on a Junos device? (Choose two.)

A. The excess traffic will be discarded
B. The excess traffic will use bandwidth available from other queues
C. The exceeding queue will be considered to have negative bandwidth credit.
D. The exceeding queue will be considered to have positive bandwidth credit

正解：B、C

解説：
https://www.juniper.net/documentation/us/en/software/junos/cos-security-devices/topics/concept/cos- transmission-scheduling-security-overview.html When a Junos device receives a packet on an interface with transmission scheduling, traffic is placed into different queues based on Class of Service (CoS) policies. If a queue exceeds its allocated bandwidth, Junos has default behaviors for handling excess traffic.
Key Junos Behaviors for Transmission Scheduling
* Queues Can Borrow Bandwidth from Other Queues #
* If a queue has excess traffic, it can use bandwidth from underutilized queues, as long as bandwidth is available.
* Reference from Juniper Documentation:
"By default, each queue can exceed the assigned bandwidth if additional bandwidth is available from other queues."
* Queues Have Credit-Based Tracking #
* A queue that stays within its allocated bandwidth is considered to have positive bandwidth credit.
* A queue that exceeds its allocation is considered to have negative bandwidth credit.
* Reference from Juniper Documentation:
"A queue receiving traffic in excess of its bandwidth allocation is considered to have negative bandwidth credit." Evaluating the Answer Choices
# B. The exceeding queue will be considered to have negative bandwidth credit.
* Correct, because when a queue exceeds its allocated bandwidth, Junos assigns it negative bandwidth credit.
* This means the queue is in debt and must recover before it can transmit additional packets.
# C. The excess traffic will use bandwidth available from other queues.
* Correct, because Junos allows excess traffic to borrow bandwidth from underutilized queues by default.
* If a forwarding class does not use its allocated bandwidth, other queues can borrow the unused bandwidth.
Why the Other Answers Are Incorrect?
# A. The excess traffic will be discarded.
* Incorrect, because Junos does not immediately discard excess traffic unless the queue cannot borrow bandwidth.
* By default, Junos allows bandwidth sharing, and only if no bandwidth is available does it drop packets.
# D. The exceeding queue will be considered to have positive bandwidth credit.
* Incorrect, because when a queue exceeds its assigned bandwidth, it gets negative bandwidth credit, not positive credit.
Verified Juniper Official Reference
# Junos CoS Transmission Scheduling Overview
"By default, each queue can exceed the assigned bandwidth if additional bandwidth is available from other queues."
"A queue receiving traffic in excess of its bandwidth allocation is considered to have negative bandwidth credit."

質問 # 47
......

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さまざまなバージョンのJN0-664関連問題資料 - Service Provider, Professional (JNCIP-SP)試験ブレーンダンプを使用すると、いつでもどこでも勉強と練習ができます、あなたはJN0-664模擬問題集をご購入になってから、あとの一年間、我々は無料の更新サービスを提供して、お客様の持っているService Provider, Professional (JNCIP-SP)模擬試験は最新のを保証します、JN0-664認定に合格すると、非常に有能で優秀であることを証明できます、Juniper JN0-664模擬試験学習資料として、合格率は学習資料がどれほど有用で効果的かを証明する最も説得力のある証拠であることは間違いありません、JN0-664試験資料は試験に緊密に関連しています、Juniper JN0-664模擬試験当社の製品は、テストエンジンの助けを借りて学習問題を修正します。

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合格するJN0-664模擬試験-有効的なJN0-664関連問題資料

Juniper JN0-664試験の準備方法｜素敵なJN0-664模擬試験試験｜最高のService Provider, Professional (JNCIP-SP)関連問題資料

Juniper Service Provider, Professional (JNCIP-SP) 認定 JN0-664 試験問題 (Q42-Q47):

最新なJN0-664試験参考書、順調にService Provider, Professional (JNCIP-SP)試験関連の証明書が取られる。