Updated Oct-2023 Premium JN0-664 Exam Engine pdf – Download Free Updated 67 Questions [Q22-Q43]

NO.22 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?

Configure the ignore-attached-bit parameter on all L2 routers.

Configure all routers to allow wide metrics.

Configure all routers to be L1.

Configure the ignore-attached-bit parameter on all L1 routers

NO.23 Exhibit

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

The PE is attached to a single local site.

The connection has not flapped since it was initiated.

There has been a VLAN ID mismatch.

The PE router has the capability to pop flow labels

Explanation
According to 1 and 2, BGP Layer 2 VPNs use BGP to distribute endpoint provisioning information and set up pseudowires between PE devices. BGP uses the Layer 2 VPN (L2VPN) Routing Information Base (RIB) to store endpoint provisioning information, which is updated each time any Layer 2 virtual forwarding instance (VFI) is configured. The prefix and path information is stored in the L2VPN database, which allows BGP to make decisions about the best path.
In the output shown in the exhibit, we can see some information about the L2VPN RIB and the pseudowire state. Based on this information, we can infer the following statements:
* The PE is attached to a single local site. This is correct because the output shows only one local site ID (1) under the L2VPN RIB section. A local site ID is a unique identifier for a site within a VPLS domain.
If there were multiple local sites attached to the PE, we would see multiple local site IDs with different prefixes.
* The connection has not flapped since it was initiated. This is correct because the output shows that the uptime of the pseudowire is equal to its total uptime (1w6d). This means that the pseudowire has been up for one week and six days without any interruption or flap.
* There has been a VLAN ID mismatch. This is not correct because the output shows that the remote and local VLAN IDs are both 0 under the pseudowire state section. A VLAN ID mismatch occurs when the remote and local VLAN IDs are different, which can cause traffic loss or misdelivery. If there was a VLAN ID mismatch, we would see different values for the remote and local VLAN IDs.
* The PE router has the capability to pop flow labels. This is correct because the output shows that the flow label pop bit is set under the pseudowire state section. The flow label pop bit indicates that the PE router can pop (remove) the MPLS flow label from the packet before forwarding it to the CE device.
The flow label is an optional MPLS label that can be used for load balancing or traffic engineering purposes.

NO.24 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.)

Configure the family route-target statement on the PEs.

Configure the family route-target statement on the RR

Configure the resolution rib bgp . 13vpn . 0 resolution-ribs inet. 0 Statement on the PEs.

Configure the resolution rib bgp.l3vpn.O resolution-ribs inet. 0 Statement on the RR

NO.25 An interface is configured with a behavior aggregate classifier and a multifield classifier How will the packet be processed when received on this interface?

The packet will be discarded.

The packet will be processed by the BA classifier first, then the MF classifier.

The packet will be forwarded with no classification changes.

The packet will be processed by the MF classifier first, then the BA classifier.

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.

NO.26 Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)

Route reflectors do not change any existing BGP attributes by default when advertising routes.

A BGP peer does not require any configuration changes to become a route reflector client.

Clients add their originator ID when advertising routes to their route reflector

Route reflectors add their cluster ID to the AS path when readvertising client routes.

NO.27 Exhibit.

Referring to the exhibit; the 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden.
What are two solutions that will solve this problem? (Choose two.)

On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy

Add the external interface prefix to the IGP routing tables

Add the internal interface prefix to the BGP routing tables.

On R4, create a policy to change the BGP next hop to 172.16.1.1 and apply it to IBGP as an export policy

NO.28 Exhibit

CE-1 and CE-2 are part of a VPLS called Customer1 No connectivity exists between CE-1 and CE-2. In the process of troubleshooting, you notice PE-1 is not learning any routes for this VPLS from PE-2, and PE-2 is not learning any routes for this VPLS from PE-1.

The route target must match on PE-1 and PE-2.

The route distinguisher must match on PE-1 and PE-2.

The instance type should be changed to I2vpn.

The no-tunnel-services statement should be deleted on both PEs.

NO.29 When building an interprovider VPN, you notice on the PE router that you have hidden routes which are received from your BGP peer with family inet labeled-unica3t configured.
Which parameter must you configure to solve this problem?

Under the family inet labeled-unicast hierarchy, add the explicit null parameter.

Under the protocols ospf hierarchy, add the traffic-engineering parameter.

Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.

Under the protocols mpls hierarchy, add the traffic-engineering parameter

NO.30 Which statement is correct about IS-IS when it performs the Dijkstra algorithm?

The local router moves its own local tuples into the candidate database

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

Tuples with the lowest cost are moved from the tree database to the LSDB.

The algorithm will stop processing once the tree database is empty.

NO.31 Which statement is true regarding BGP FlowSpec?

It uses a remote triggered black hole to protect a network from a denial-of-service attack.

It uses dynamically created routing policies to protect a network from denial-of-service attacks

It is used to protect a network from denial-of-service attacks dynamically

It verifies that the source IP of the incoming packet has a resolvable route in the routing table

NO.32 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?

circuit cross-connect

BGP Layer 2 VPN

LDP Layer 2 circuit

translational cross-connect

NO.33 Exhibit.

Referring to the exhib.t, what must be changed to establish a Level 1 adjacency between routers R1 and R2?

Change the level l disable parameter under the R1 protocols isis interface lo0.0 hierarchy to the level 2 disable parameter.

Remove the level i disable parameter under the R2 protocols isis interface loo . 0 configuration hierarchy.

Change the level 1 disable parameter under the R2 protocols isis interface ge-1/2/3 .0 hierarchy to the level 2 disable parameter

Add IP addresses to the interface ge-l/2/3 unit 0 family iso hierarchy on both R1 and R2.

NO.34 Which two statements are correct about a sham link? (Choose two.)

It creates an OSPF multihop neighborship between two PE routers.

It creates a BGP multihop neighborship between two PE routers.

The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes

The PEs exchange Type 3 OSPF LSAs instead of Type 1 OSPF LSAs for the L3VPN routes.

NO.35 By default, which statement is correct about OSPF summary LSAs?

All Type 2 and Type 7 LSAs will be summanzed into a single Type 5 LSA

The area-range command must be installed on all routers.

Type 3 LSAs are advertised for routes in Type 1 LSAs.

The metric associated with a summary route will be equal to the lowest metric associated with an individual contributing route

NO.36 Which two statements are correct about the customer interface in an LDP-signaled pseudowire? (Choose two)

When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement

When the encapsulation is ethernet-ccc, only frames without a VLAN tag are accepted in the data plane

When the encapsulation is vLan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement

When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.

NO.37 Exhibit

Based on the configuration contents shown in the exhibit, which statement is true?

Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10

Joins for any group are accepted if the group count value is less than 25.

Joins for group 224.7.7.7 are always rejected, regardless of the group count.

Joins for group 224.7.7.7 are accepted if the group count is less than 25

NO.38 Which three mechanisms are used by Junos platforms to evaluate incoming traffic for CoS purposes? (Choose three )

rewrite rules

behavior aggregate classifiers

traffic shapers

fixed classifiers

multifield classifiers

NO.39 Exhibit

You have MAC addresses moving in your EVPN environment
Referring to the exhibit, which two statements are correct about the sequence number? (Choose two)

It identifies MAC addresses that should be discarded.

It resolves conflicting MAC address ownership claims.

It helps the local PE to identify the latest advertisement.

It is advertised using a Type 2 message

NO.40 Exhibit

You are asked to exchange routes between R1 and R4 as shown in the exhibit. These two routers use the same AS number Which two steps will accomplish this task? (Choose two.)

Configure the BGP group with the advertise-peer-as parameter on R1 and R4.

Configure the BGP group with the as-override parameter on R2 and R3

Configure the BGP group with the advertise-peer-as parameter on R2 and R3.

Configure the BGP group with the as-override parameter on R1 and R4

NO.41 Exhibit

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

This VPN connects customer sites that use different AS numbers.

This VPN connects customer sites that use the same AS number

A Layer 2 VPN is configured.

A Layer 3 VPN is configured.

NO.42 Exhibit

Referring to the exhibit, you are receiving the 192.168 0 0/16 route on both R3 and R4 from your EBGP neighbor You must ensure that R1 and R2 receive both BGP routes from the route reflector In this scenario, which BGP feature should you configure to accomplish this behavior?

add-path

multihop

multipath

route-target

NO.43 You are asked to protect your company’s customers from amplification attacks. In this scenario, what is Juniper’s recommended protection method?

ASN prepending

BGP FlowSpec

destination-based Remote Triggered Black Hole

unicast Reverse Path Forwarding

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