Free JN0-664 Exam Braindumps

Exhibit

You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based MPLS network using BGP You have already configured mpis ipv6- tunneling on your PE routers.
Which two statements are correct about the BGP configuration in this scenario? (Choose two.)

1. A. You must configure family inet6 labcled-unicast between PE routers.
2. B. You must configure family inet6 unicaat between PE and CE routers.
3. C. You must configure family inet6 add-path between PE and CE routers.
4. D. You must configure family inet6 unicast between PE routers

Correct Answer: AB
To transport IPv6 traffic over an IPv4-based MPLS network using BGP, you need to configure two address families: family inet6 labeled-unicast and family inet6 unicast. The former is used to exchange IPv6 routes with MPLS labels between PE routers, and the latter is used to exchange IPv6 routes without labels between PE and CE routers. The mpis ipv6-tunneling command enables the PE routers to encapsulate the IPv6 packets with an MPLS label stack and an IPv4 header before sending them over the MPLS network.

Exhibit

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

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

Correct Answer: B
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.

You are a network architect for a service provider and want to offer Layer 2 services to your customers You want to use EVPN for Layer 2 services in your existing MPLS network.
Which two statements are correct in this scenario? (Choose two.)

1. A. Segment routing must be configured on all PE routers.
2. B. VXLAN must be configured on all PE routers.
3. C. EVPN uses Type 2 routes to advertise MAC address and IP address pairs learned using ARP snooping
4. D. EVPN uses Type 3 routes to join a multicast tree to flood traffic.

Correct Answer: CD
EVPN is a technology that connects L2 network segments separated by an L3 network using a virtual Layer 2 network overlay over the Layer 3 network. EVPN uses BGP as its control protocol to exchange different types of routes for different purposes. Type 2 routes are used to advertise MAC address and IP address pairs learned using ARP snooping from the local CE devices. Type 3 routes are used to join a multicast tree to flood traffic such as broadcast, unknown unicast, and multicast (BUM) traffic.

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?

1. A. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.
2. B. Under the protocols ospf hierarchy, add the traffic-engineering parameter.
3. C. Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.
4. D. Under the protocols mpls hierarchy, add the traffic-engineering parameter

Correct Answer: C
The resolve-vpn parameter is a BGP option that allows a router to resolve labeled VPN-IPv4 routes using unlabeled IPv4 routes received from another BGP peer with family inet labeled-unicast configured. This option enables interprovider VPNs without requiring MPLS labels between ASBRs or using VRF tables on ASBRs. In this scenario, you need to configure the resolve-vpn parameter under [edit protocols bgp group external family inet labeled-unicast] hierarchy level on both ASBRs.

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.)

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

Correct Answer: AB
Transmission scheduling is a CoS feature that allows you to allocate bandwidth among different queues on an interface. Each queue has a configured bandwidth percentage that determines how much of the available bandwidth it can use. If a queue exceeds its allocated bandwidth, it is considered to have negative bandwidth credit and its excess traffic will be discarded by default. If a queue does not use all of its allocated bandwidth, it is considered to have positive bandwidth credit and its unused bandwidth can be shared by other queues.