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NEW QUESTION # 45
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 processed by the BA classifier first, then the MF classifier.
- B. The packet will be discarded.
- C. The packet will be processed by the MF classifier first, then the BA classifier.
- D. The packet will be forwarded with no classification changes.
Answer: D
Explanation:
behavior aggregate (BA) classifiers and multifield (MF) classifiers are two types of classifiers that are used to assign packets to a forwarding class and a loss priority based on different criteria. The forwarding class determines the output queue for a packet. The loss priority is used by a scheduler to control packet discard during periods of congestion.
A BA classifier maps packets to a forwarding class and a loss priority based on a fixed-length field in the packet header, such as DSCP, IP precedence, MPLS EXP, or IEEE 802.1p CoS bits. A BA classifier is computationally efficient and suitable for core devices that handle high traffic volumes. A BA classifier is useful if the traffic comes from a trusted source and the CoS value in the packet header is trusted.
An MF classifier maps packets to a forwarding class and a loss priority based on multiple fields in the packet header, such as source address, destination address, protocol type, port number, or VLAN ID. An MF classifier is more flexible and granular than a BA classifier and can match packets based on complex filter rules. An MF classifier is suitable for edge devices that need to classify traffic from untrusted sources or rewrite packet headers.
You can configure both a BA classifier and an MF classifier on an interface. If you do this, the BA classification is performed first and then the MF classification. If the two classification results conflict, the MF classification result overrides the BA classification result.
Based on this information, we can infer the following statements:
The packet will be discarded. This is not correct because the packet will not be discarded by the classifiers unless it matches a filter rule that specifies discard as an action. The classifiers only assign packets to a forwarding class and a loss priority based on their match criteria.
The packet will be processed by the BA classifier first, then the MF classifier. This is correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.
The packet will be forwarded with no classification changes. This is not correct because the packet will be classified by both the BA classifier and the MF classifier if they are configured on an interface. The final classification result will determine which output queue and which discard policy will be applied to the packet.
The packet will be processed by the MF classifier first, then the BA classifier. This is not correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.
NEW QUESTION # 46
Exhibit
Referring to the exhibit, PIM-SM is configured on all routers, and Anycast-RP with Anycast-PIM is used for the discovery mechanism on RP1 and RP2. The interface metric values are shown for the OSPF area.
In this scenario, which two statements are correct about which RP is used? (Choose two.)
- A. Source1 will use RP1 and Receiver1 will use RP1 for group 224.1.1.1.
- B. Source2 will use RP2 and Received will use RP2 for group 224.2.2.2.
- C. Source1 will use RP1 and Receiver1 will use RP2 for group 224.1 1 1
- D. Source2 will use RP1 and Receiver2 will use RP1 for group 224.2.2.2.
Answer: A,B
Explanation:
Explanation
A sham link is a logical link between two PE routers that belong to the same OSPF area but are connected through an L3VPN. A sham link makes the PE routers appear as if they are directly connected, and prevents OSPF from preferring an intra-area back door link over the VPN backbone. A sham link creates an OSPF multihop neighborship between the PE routers using TCP port 646. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes, which allows OSPF to use the correct metric for route selection1.
NEW QUESTION # 47
Which two statements about the output shown in the exhibit are correct? (Choose two.)
- A. There has been a VLAN ID mismatch.
- B. The PE router has the capability to pop flow labels.
- C. The connection has not flapped since it was initiated.
- D. The PE is attached to a single local site.
Answer: C,D
NEW QUESTION # 48
Exhibit
Which two statements are true about the OSPF adjacency displayed in the exhibit? (Choose two.)
- A. There is a mismatch in the dead interval parameter between routers R1 and R2.
- B. There is a mismatch in the hello interval parameter between routers R1 and R2
- C. There is a mismatch in the poll interval parameter between routers R1 and R2.
- D. There is a mismatch in the OSPF hold timer parameter between routers R1 and R2.
Answer: A,B
Explanation:
Explanation
The hello interval is the time interval between two consecutive hello packets sent by an OSPF router on an interface. The dead interval is the time interval after which a neighbor is declared down if no hello packets are received from it. These parameters must match between two OSPF routers for them to form an adjacency. In the exhibit, router R1 has a hello interval of 10 seconds and a dead interval of 40 seconds, while router R2 has a hello interval of 30 seconds and a dead interval of 120 seconds. This causes a mismatch and prevents them from becoming neighbors23.
NEW QUESTION # 49
You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network. Your PE-2 device connects to two sites within the same VPN.
In this scenario, which statement is correct?
- A. You must use separate physical interfaces to connect PE-2 to each site.
- B. By default on PE-2, the remote site IDs are automatically assigned based on the order that you add the interfaces to the site configuration.
- C. You must create a unique Layer 2 VPN routing instance for each site on the PE-2 device.
- D. By default on PE-2, the site's local ID is automatically assigned a value of 0 and must be configured to match the total number of attached sites.
Answer: B
NEW QUESTION # 50
Referring to the exhibit, which two statements are true? (Choose two.)
- A. The multipath configuration is used for load balancing.
- B. The multihop configuration is used for load balancing.
- C. This route is learned from the same AS number.
- D. This route is learned from two different AS numbers.
Answer: A,C
NEW QUESTION # 51
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. The local router moves its own local tuples into the candidate database
- D. Tuples with the lowest cost are moved from the tree database to the LSDB.
Answer: C
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 # 52
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. The next-hop value for these routes is changed by ISP-A before being sent to R3.
- C. By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3.
- D. All BGP attribute values must be removed before receiving the routes.
Answer: A,C
Explanation:
BGP is an exterior gateway protocol that uses path vector routing to exchange routing information among autonomous systems. BGP uses various attributes to select the best path to each destination and to propagate routing policies. Some of the common BGP attributes are AS path, next hop, local preference, MED, origin, weight, and community. BGP attributes can be classified into four categories: well-known mandatory, well-known discretionary, optional transitive, and optional nontransitive. Well-known mandatory attributes are attributes that must be present in every BGP update message and must be recognized by every BGP speaker.
Well-known discretionary attributes are attributes that may or may not be present in a BGP update message but must be recognized by every BGP speaker. Optional transitive attributes are attributes that may or may not be present in a BGP update message and may or may not be recognized by a BGP speaker. If an optional transitive attribute is not recognized by a BGP speaker, it is passed along to the next BGP speaker. Optional nontransitive attributes are attributes that may or may not be present in a BGP update message and may or may not be recognized by a BGP speaker. If an optional nontransitive attribute is not recognized by a BGP speaker, it is not passed along to the next BGP speaker. In this question, we have four routers (R1, R2, R3, and R4) that are connected in a full mesh topology and running IBGP. R3 receives the 192.168.0.0/16 route from its EBGP neighbor and advertises it to R1 and R4 with different BGP attribute values. We are asked which statements are correct about the BGP routes on R3 that are learned from the ISP-A neighbor. Based on the information given, we can infer that the correct statements are:
By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3. This is because the default behavior of EBGP is to preserve the next-hop attribute of the routes received from another EBGP neighbor. The next-hop attribute indicates the IP address of the router that should be used as the next hop to reach the destination network.
The BGP local-preference value that is used by ISP-A is not advertised to R3. This is because the local-preference attribute is a well-known discretionary attribute that is used to influence the outbound traffic from an autonomous system. The local-preference attribute is only propagated within an autonomous system and is not advertised to external neighbors.
References: : https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html :
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html :
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13759-37.html
NEW QUESTION # 53
Which two statements are correct about the class-of-service configuration shown in the exhibit?
(Choose two.)
- A. The drop probability jumps immediately from 20% to 60% when the queue level reaches 75% full.
- B. The drop probability gradually increases from 20% to 60% as the queue level increases from 50% full to 75% full.
- C. To use this drop profile, you apply it directly to an interface.
- D. To use this drop profile, you reference it in a scheduler.
Answer: B,D
NEW QUESTION # 54
The network shown in the exhibit is based on IS-IS.
Which statement is correct in this scenario?
- A. The routers are using unnumbered interfaces.
- B. The system ID of R1_2 is 192.168.16.1.
- C. The NSEL byte for Area 0001 is 00.
- D. The area address is two bytes.
Answer: C
NEW QUESTION # 55
Which two statements are correct regarding bootstrap messages that are forwarded within a PIM sparse mode domain? (Choose two.)
- A. Bootstrap messages are forwarded only to routers that explicitly requested the messages within the PIM sparse-mode domain
- B. Bootstrap messages are used to notify which router is the PIM RP
- C. Bootstrap messages distribute RP information dynamically during an RP election.
- D. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain.
Answer: C,D
Explanation:
Explanation
Bootstrap messages are PIM messages that are used to distribute rendezvous point (RP) information dynamically during an RP election. Bootstrap messages are sent by bootstrap routers (BSRs), which are routers that are elected to perform the RP discovery function for a PIM sparse-mode domain. Bootstrap messages contain information about candidate RPs and their multicast groups, as well as BSR priority and hash mask length. Bootstrap messages are forwarded to all routers within a PIM sparse-mode domain using hop-by-hop flooding.
NEW QUESTION # 56
R2 is receiving the same route from R1 and R3. You must ensure that you can load balance traffic for that route.
Referring to the exhibit, which configuration change will allow load balancing?
- A. Apply the prepend policy as an import policy under group R3.
- B. Configure the multipath multiple-as parameter under the global BGP configuration.
- C. Apply the prepend policy as an import policy under group R1.
- D. Configure the multipath parameter under the global BGP configuration.
Answer: B
NEW QUESTION # 57
You have an L2VPN connecting two CEs across a provider network. The CEs and provider network are configured with the default MTU setting. You use the ping command from one CE to the other CE with a size of 1500 bytes.
In this scenario, which statement is correct when using the ping command?
- A. You expect an ICMP message too long error.
- B. You expect a silent discard.
- C. You expect the ping results to be fragmented.
- D. You expect an echo reply.
Answer: D
NEW QUESTION # 58
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. The local router moves its own local tuples into the candidate database.
- C. When a new neighbor ID in the tree database matches a router ID in the LSDthe neighbor ID is moved to the candidate database.
- D. Tuples with the lowest cost are moved from the tree database to the LSDB.
Answer: A
NEW QUESTION # 59
You are responding to an RFP for a new MPLS VPN implementation. The solution must use LDP for signaling and support Layer 2 connectivity without using BGP. The solution must be scalable and support multiple VPN connections over a single MPLS LSP. The customer wants to maintain all routing for their private network.
In this scenario, which solution do you propose?
- A. circuit cross-connect
- B. BGP Layer 2 VPN
- C. translational cross-connect
- D. LDP Layer 2 circuit
Answer: D
NEW QUESTION # 60
Exhibit
You are attempting to summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500. You implement the export policy shown in the exhibit and all routes from the routing table stop being advertised.
In this scenario, which two steps would you take to summarize the route in BGP? (Choose two.)
- A. Add the set protocols bgp family inet unicast add-path command to allow additional routes to the RIB tables. -
- B. Remove the from protocol bgp command from the export policy.
- C. Replace exact in the export policy with orlonger.
- D. Add the set routing-options static route 203.0.113.123/25 discard command.
Answer: C,D
Explanation:
To summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500, you need to do the following:
Add the set routing-options static route 203.0.113.128/25 discard command. This creates a static route for the summary prefix and discards any traffic destined to it. This is necessary because BGP can only advertise routes that are present in the routing table.
Replace exact in the export policy with orlonger. This allows R8 to match and advertise any route that is equal or more specific than the summary prefix. The exact term only matches routes that are exactly equal to the summary prefix, which is not present in the routing table.
NEW QUESTION # 61
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 discarded.
- C. The packet will be processed by the BA classifier first, then the MF classifier.
- D. The packet will be processed by the MF classifier first, then the BA classifier.
Answer: C
NEW QUESTION # 62
A router running IS-IS is configured with an ISO address of 49.0001.00a0.c96b.c490.00.
Which part of this address is the system ID?
- A. c96b.c490 is the system identifier.
- B. 0001.00a0.c96b.c490 is the system identifier.
- C. 00a0.c96b.c490 is the system identifier.
- D. c490 is the system identifier.
Answer: C
NEW QUESTION # 63
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 L2 routers.
- B. Configure the ignore-attached-bit parameter on all L1 routers.
- C. Configure all routers to allow wide metrics.
- D. Configure all routers to be L1.
Answer: B
NEW QUESTION # 64
Referring to the exhibit, you must provide Internet access for VPN-A using CE-1 as the hub CE.
Which two statements are correct in this situation? (Choose two.)
- A. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> GW-1.
- B. Internet traffic from Site 2 takes the path of PE-2 -> PE-1 -> CE-1 -> PE-1 -> GW-1.
- C. You must use RIB groups to leak routes between the inet.0 and VPN-A.inet.0 tables.
- D. RIB groups are not needed to leak routes between the inet.0 and VPN-A.inet.0 tables.
Answer: B,C
NEW QUESTION # 65
Which two statements about IS-IS are correct? (Choose two.)
- A. PSNPs are used to acknowledge a received LSP.
- B. CSNPs are used to request a missing LSP.
- C. PSNPs are used to request a missing LSP.
- D. CSNPs are used to acknowledge a received LSP.
Answer: A,C
NEW QUESTION # 66
You are configuring an interprovider Option C Layer 3 VPN to connect two customer sites.
Referring to the exhibit, which three statements are correct? (Choose three.)
- A. PE routers maintain the internal routes from its own AS, the loopback address from the other AS Pes, and the L3VPN routes.
- B. P routers only maintain the internal routes from their own AS.
- C. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.
- D. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.
- E. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
Answer: A,B,C
NEW QUESTION # 67
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