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최신 JNCIP-SP JN0-664 무료샘플문제 (Q20-Q25):

질문 # 20
Which two statements are correct about the customer interface in an LDP-signaled pseudowire? (Choose two)

A. When the encapsulation is ethernet-ccc, only frames without a VLAN tag are accepted in the data plane
B. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.
C. When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement
D. When the encapsulation is vLan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement

정답：B,D

설명：
Explanation
The customer interface in an LDP-signaled pseudowire is the interface on the PE router that connects to the CE device. An LDP-signaled pseudowire is a type of Layer 2 circuit that uses LDP to establish a point-to-point connection between two PE routers over an MPLS network. The customer interface can have different encapsulation types depending on the type of traffic that is carried over the pseudowire. The encapsulation types are ethernet-ccc, vlan-ccc, extended-vlan-ccc, atm-ccc, frame-relay-ccc, ppp-ccc, cisco-hdlc-ccc, and tcc-ccc. Depending on the encapsulation type, the customer interface can accept or reject tagged or untagged frames in the data plane, and include or exclude VLAN tags in the control plane LDP advertisement. The following table summarizes the behavior of different encapsulation types:

질문 # 21
Which three mechanisms are used by Junos platforms to evaluate incoming traffic for CoS purposes? (Choose three )

A. rewrite rules
B. traffic shapers
C. behavior aggregate classifiers
D. fixed classifiers
E. multifield classifiers

정답：C,D,E

설명：
Junos platforms use different mechanisms to evaluate incoming traffic for CoS purposes, such as:
Behavior aggregate classifiers: These classifiers use a single field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined or user-defined values.
Fixed classifiers: These classifiers use a fixed field in a packet header to classify traffic into different forwarding classes and loss priorities based on predefined values.
Multifield classifiers: These classifiers use multiple fields in a packet header to classify traffic into different forwarding classes and loss priorities based on user-defined values and filters.
Rewrite rules and traffic shapers are not used to evaluate incoming traffic for CoS purposes, but rather to modify or shape outgoing traffic based on CoS policies.

질문 # 22
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 local address on R2 to be higher than R3.
B. Change the bootstrap priority 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 group-range to be more specific on R2 than R3.

정답：B

설명：
Explanation
PIM Bootstrap Router (BSR) is a mechanism that allows PIM routers to discover and announce rendezvous point (RP) information for multicast groups. BSR uses two roles: candidate BSR and candidate RP. Candidate BSR is the router that collects information from all available RPs in the network and advertises it throughout the network. Candidate RP is the router that wants to become the RP and registers itself with the BSR. There can be only one active BSR in the network, which is elected based on the highest priority or highest IP address if the priority is the same. The BSR priority can be configured manually or assigned automatically. The default priority is 0 and the highest priority is 2551. In this question, R4 is directly connected to both RPs (R2 and R3) and is currently sending all joins upstream to R3 but we want all joins to go to R2 instead. To achieve this, we need to change the BSR priority on R2 to be higher than R3 so that R2 becomes the active BSR and advertises its RP information to R4.

질문 # 23
Exhibit

CE-1 must advertise ten subnets to PE-1 using BGP Once CE-1 starts advertising the subnets to PE-1, the BGP peering state changes to Active.
Referring to the CLI output shown in the exhibit, which statement is correct?

A. CE-1 is unreachable
B. CE-1 is advertising its entire routing table.
C. CE-1 is configured with an incorrect peer AS
D. The prefix limit has been reached on PE-1

정답：D

설명：
Analyzing the Exhibit and Understanding the Issue
The exhibit shows BGP configurations on CE-1 and PE-1, which are connected via EBGP.
* CE-1 (Customer Edge)
* Uses AS 64511 and establishes an EBGP session with PE-1 (AS 65550).
* Configured to export 10 static routes (192.168.1.0/24 - 192.168.10.0/24) using the static-to-bgp policy.
* PE-1 (Provider Edge)
* Uses AS 65550 and is peering with CE-1 (AS 64511).
* Configured with a prefix-limit of 5 on received routes from CE-1.
* Teardown enabled, meaning if more than 5 prefixes are received, the BGP session is shut down.
Identifying the Problem
* CE-1 is correctly configured with peer AS 65550, so Option B ("CE-1 is configured with an incorrect peer AS") is incorrect #.
* CE-1 is advertising exactly 10 static routes (as per policy).
* PE-1 has a prefix-limit maximum 5 with teardown enabled.
* This means that when CE-1 advertises more than 5 prefixes, PE-1 shuts down the BGP session.
* BGP moves to the "Active" state, indicating that the session has been disrupted and PE-1 is trying to re-establish the connection.
* CE-1 is reachable since the session was initially established before the limit was exceeded, so Option D ("CE-1 is unreachable") is incorrect #.
* CE-1 is not advertising its entire routing table, only the static prefixes listed in the policy, so Option A ("CE-1 is advertising its entire routing table") is incorrect #.
Correct Answer
# C. The prefix limit has been reached on PE-1
Verification from Juniper Documentation
* Juniper BGP Prefix Limit Documentation confirms that exceeding the prefix limit with teardown causes the BGP session to go into "Active" state.
* Juniper Troubleshooting Guide for BGP Peering Issues states that when a BGP session reaches the prefix limit and has teardown enabled, the session is terminated.

질문 # 24
Referring to the exhibit, which three statements are correct about route 10.0.0.0/16 when using the default BGP advertisement rules? (Choose three.)

A. R1 will advertise 10.0.0.0/16 to R2 with 192.168.1.1 as the next hop.
B. R2 will advertise 10.0.0.0/16 to R3 with 192.168.1.1 as the next hop.
C. R4 will advertise 10.0.0.0/16 to R6 with 172.16.1.1 as the next hop.
D. R2 will advertise 10.0.0.0/16 to R4 with 172.16.1.1 as the next hop.
E. R1 will prepend AS 65531 when advertising 10.0.0.0/16 to R2.

정답：A,C,D

설명：
B is incorrect, as an BGP router cannot send an IBGP route out to another IBGP peer (unless its configured as a route-reflector).
D is incorrect as the AS Path attribute only gets prepended when advertising over EBGP peerings.

질문 # 25
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