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The JN0-664 exam is a comprehensive certification that covers topics such as advanced OSPF and IS-IS routing protocols, BGP, MPLS, L2VPNs, and L3VPNs. It also covers the implementation of multicast, CoS, and IP services. JN0-664 exam is designed to test the skills of professionals who have extensive experience in configuring and managing service provider networks. JN0-664 Exam is conducted online and consists of multiple-choice questions, drag and drop questions, and simulation-based questions.

Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q84-Q89):

NEW QUESTION # 84
An interface is configured with a behavior aggregate classifier and a multifield classifier How will the packet be processed when received on this interface?

A. The packet will be forwarded with no classification changes.
B. The packet will be processed by the BA classifier first, then the MF classifier.
C. The packet will be processed by the MF classifier first, then the BA classifier.
D. The packet will be discarded.

Answer: B

Explanation:
When a Juniper device receives a packet on an interface with both a Behavior Aggregate (BA) classifier and a Multifield (MF) classifier, Junos OS follows a specific processing order to apply Class of Service (CoS).
Understanding the Classifiers in Junos CoS
Behavior Aggregate (BA) Classifier
Uses packet headers (DSCP, IP precedence, or MPLS EXP bits) to classify traffic into forwarding classes.
Applied at the ingress interface.
Example: A packet with DSCP 46 (Expedited Forwarding) is mapped to a high-priority queue.
Multifield (MF) Classifier
Uses match conditions (like source/destination IP, port numbers, protocol types) to classify traffic.
Typically used for more granular classification beyond what BA can provide.
Junos Processing Order:
When both BA and MF classifiers are configured on an interface, Junos first applies the BA classifier, then the MF classifier.
MF classifier can override the BA classification if necessary.
Evaluating the Answer Choices
✅ B. The packet will be processed by the BA classifier first, then the MF classifier.
Correct, because Junos first applies BA classification based on DSCP/MPLS EXP bits.
After BA classification, the MF classifier is applied, which can refine or override the BA classification.
❌ A. The packet will be discarded.
Incorrect, because classification does not drop packets unless explicitly configured with a filter or policing action.
❌ C. The packet will be forwarded with no classification changes.
Incorrect, because both classifiers are applied in a specific order, meaning classification changes will occur.
❌ D. The packet will be processed by the MF classifier first, then the BA classifier.
Incorrect, because BA classification is always applied first, followed by MF classification.
Final answer: ✅ B. The packet will be processed by the BA classifier first, then the MF classifier.
Official Juniper Reference:
"When both BA and MF classifiers are applied on an interface, Junos OS first classifies packets using the BA classifier before applying the MF classifier."

NEW QUESTION # 85
Exhibit

Referring to the exhibit, CE-1 is providing NAT services for the hosts at Site 1 and you must provide Internet access for those hosts Which two statements are correct in this scenario? (Choose two.)

A. You must configure a RIB group on PE-1 to leak the 10 1 2.0/24 prefix from the VPN-A.inet.0 table to the inet.0 table.
B. You must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.0 table.
C. You must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.
D. You must configure a static route in the main routing instance for the 10 1 2.0/24 prefix that uses the VPN-A.inet.0 table as the next hop

Answer: B,C

NEW QUESTION # 86
Exhibit

Referring to the exhibit, what do the brackets [ ] in the AS path identify?

A. They identify the local AS number associated with the AS path if configured on the router, or if AS path prepending is configured
B. They identify that a BGP confederation is being used to ensure that there are no routing loops.
C. They identify an AS set, which are groups of AS numbers in which the order does not matter
D. They identify that the autonomous system number is incomplete and awaiting more information from the BGP protocol.

Answer: C

Explanation:
The brackets [ ] in the AS path identify an AS set, which are groups of AS numbers in which the order does not matter. An AS set is used when BGP aggregates routes from different ASs into a single prefix. For example, if BGP aggregates routes 10.0.0.0/16 and 10.1.0.0/16 from AS 100 and AS 200, respectively, into a single prefix 10.0.0.0/15, then the AS path for this prefix will be [100 200]. An AS set reduces the length of the AS path and prevents routing loops.

NEW QUESTION # 87
You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers.
Which action accomplishes this task?

A. Configure the ignore-attached-bit parameter on all L1 routers
B. Configure the ignore-attached-bit parameter on all L2 routers.
C. Configure all routers to be L1.
D. Configure all routers to allow wide metrics.

Answer: A

Explanation:
Explanation
The attached bit is a flag in an IS-IS LSP that indicates whether a router is connected to another area or level (L2) of the network. By default, L2 routers set this bit when they advertise their LSPs to L1 routers, and L1 routers use this bit to select a default route to reach other areas or levels through L2 routers. However, this may result in suboptimal routing if there are multiple L2 routers with different paths to other areas or levels.
To ensure that L1 routers have only the most specific routes available from L2 routers, you can configure the ignore-attached-bit parameter on all L1 routers. This makes L1 routers ignore the attached bit and install all interarea routes learned from L2 routers in their routing tables.

NEW QUESTION # 88
Which statement is correct about IS-IS when it performs the Dijkstra algorithm?

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

Answer: D

Explanation:
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.

NEW QUESTION # 89
......

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