Juniper JN0-664 Online Practice Questions and Exam Preparation

Juniper JN0-664 Online Questions & Answers

• Question 1:

  Referring to the exhibit,

  

  A working L3VPN exists that connects VPN-A sites CoS is configured correctly to match on the MPLS EXP bits of the LSP, but when traffic is sent from Site-1 to Site-2, PE-2 is not classifying the traffic correctly What should you do to solve the problem?

  A. Configure the explicit-null statement on PE-1.
  B. Configure the explicit-null statement on PE-2
  C. Configure VPN prefix mapping for the PE-1_to_PE-2 LSP
  D. Set a static CoS value for the PE-1_to_PE-2 LSP
  B. Configure the explicit-null statement on PE-2

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  Explanation/Reference:

• Question 2:

  Referring to the exhibit.

  

  You have an OSPF environment. You have recently added a router called R4 that is directly connected to R1 and R2. You discover that R4 is only peering with R2. How would you correct the peering?

  A. Adjust the Hello Interval on R1 and R2 to match the Hello Interval on R4.
  B. Change the MTU size on R1 and R2 to be 22 bytes higher than R4's MTU size.
  C. Adjust the Dead Interval on R4 to match the Dead Interval on R1 and R2.
  D. Adjust the Priority on R1 to be lower than the Priority on R4.
  A. Adjust the Hello Interval on R1 and R2 to match the Hello Interval on R4.

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  Explanation/Reference:

• Question 3:

  Click the Exhibit button.

  

  You are troubleshooting the connection between AS 64496 and AS 64497 and notice that only one of the paths is being used for traffic forwarding. Referring to the exhibit, which three actions will ensure that R1 is configured properly for load balancing BGP routes? (Choose three.)

  A. Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops.
  B. Verify that the multipath option is configured under protocols bgp on both R2 and R3.
  C. Verify that there is a load balancing export policy under routing-options for the received BGP routes on R1.
  D. Verify that the multipath option is configured under protocols bgp on R1.
  E. Verify that an import load balancing policy exists under protocols bgp for the received BGP routes on R1.
  A. Verify that the routing table on R1 has BGP routes for 203.0.113.128/25 with multiple next hops.
  C. Verify that there is a load balancing export policy under routing-options for the received BGP routes on R1.
  D. Verify that the multipath option is configured under protocols bgp on R1.

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  Explanation/Reference:

• Question 4:

  Which two statements about IS-IS are correct? (Choose two.)

  A. PSNPs are flooded periodically.
  B. PSNPs contain only descriptions of LSPs.
  C. CSNPs are flooded periodically
  D. CSNPs contain only descriptions of LSPs.
  B. PSNPs contain only descriptions of LSPs.
  C. CSNPs are flooded periodically

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  Explanation/Reference:

  IS-IS is an interior gateway protocol that uses link-state routing to exchange routing information among routers within a single autonomous system. IS-IS uses two types of packets to synchronize link-state databases among routers: Link State Packets (LSPs) and Partial Sequence Number Packets (PSNPs). LSPs contain information about the state and cost of links in the network, and are flooded periodically throughout the network. PSNPs are used to acknowledge receipt of LSPs and request retransmission of missing or corrupted LSPs. PSNPs contain only descriptions of LSPs, such as their sequence numbers and checksums3. IS-IS also uses another type of packet called Complete Sequence Number Packets (CSNPs), which are used to summarize the entire link-state database at regular intervals or when a new adjacency is formed. CSNPs are flooded periodically throughout the network and contain only descriptions of LSPs4. Therefore, PSNPs contain only descriptions of LSPs and CSNPs are flooded periodically. References: 3: https://www.juniper.net/documentation/us/en/software/junos/routing- policy/topics/concept/routing-policy-is-is-partial-sequence-number-packet-psnp.html 4: https://www.juniper.net/documentation/us/en/software/junos/routing- policy/topics/concept/routing-policy-is-is-complete-sequence-number-packet-csnp.html

• Question 5:

  Referring to the 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)

  A. It identifies MAC addresses that should be discarded.
  B. It resolves conflicting MAC address ownership claims.
  C. It helps the local PE to identify the latest advertisement.
  D. It is advertised using a Type 2 message
  B. It resolves conflicting MAC address ownership claims.
  D. It is advertised using a Type 2 message

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  Explanation/Reference:

• Question 6:

  Which two statements are correct about VPLS tunnels? (Choose two.)

  A. LDP-signaled VPLS tunnels only support control bit 0.
  B. LDP-signaled VPLS tunnels use auto-discovery to provision sites
  C. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
  D. BGP-signaled VPLS tunnels require manual provisioning of sites.
  A. LDP-signaled VPLS tunnels only support control bit 0.
  B. LDP-signaled VPLS tunnels use auto-discovery to provision sites

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  Explanation/Reference:

• Question 7:

  In IS-IS, which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two)

  A. A router with a priority of 10 wins the DIS election over a router with a priority of 1.
  B. A router with a priority of 1 wins the DIS election over a router with a priority of 10.
  C. On the multi-access network, each router forms an adjacency to every other router on the segment
  D. On the multi-access network, each router only forms an adjacency to the DIS.
  A. A router with a priority of 10 wins the DIS election over a router with a priority of 1.
  C. On the multi-access network, each router forms an adjacency to every other router on the segment

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  Explanation/Reference:

• Question 8:

  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.)

  A. Configure the family route-target statement on the PEs.
  B. Configure the family route-target statement on the RR
  C. Configure the resolution rib bgp . 13vpn . 0 resolution-ribs inet. 0 Statement on the PEs.
  D. Configure the resolution rib bgp.l3vpn.O resolution-ribs inet. 0 Statement on the RR
  B. Configure the family route-target statement on the RR
  D. Configure the resolution rib bgp.l3vpn.O resolution-ribs inet. 0 Statement on the RR

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  Explanation/Reference:

  BGP route target filtering is a technique that reduces the number of routers that receive VPN routes and route updates, helping to limit the amount of overhead associated with running a VPN. BGP route target filtering is based on the

  exchange of the route-target address family, which contains information about the VPN membership of each PE device. Based on this information, a PE device can decide whether to accept or reject VPN routes from another PE device.

  BGP route target filtering can be configured on PE devices or on route reflectors (RRs). Configuring BGP route target filtering on RRs is more efficient and scalable, as it reduces the number of BGP sessions and updates between PE devices.

  To configure BGP route target filtering on RRs, the following steps are required:

  Configure the family route-target statement under the BGP group or neighbor configuration on the RRs. This enables the exchange of the route-target address family between the RRs and their clients (PE devices). Configure the resolution rib

  bgp.l3vpn.0 resolution-ribs inet.0 statement under the routing-options configuration on the RRs. This enables the RRs to resolve next hops for VPN routes using the inet.0 routing table. Configure an export policy for BGP route target filtering

  under the routing-options configuration on the RRs. This policy controls which route targets are advertised to each PE device based on their VPN membership.

• Question 9:

  Referring to the exhibit.

  

  Which statement is correct?

  A. The vrf-target configuration will allow routes to be shared between CE-1 and CE-2.
  B. The vrf-target configuration will stop routes from being shared between CE-1 and CE-2.
  C. The route-distinguisher configuration will allow overlapping routes to be shared between CE-1 and CE-2.
  D. The route-diatinguisher configuration will stop routes from being shared between CE-1 and CE-2.
  C. The route-distinguisher configuration will allow overlapping routes to be shared between CE-1 and CE-2.

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  Explanation/Reference:

  The route distinguisher (RD) is a BGP attribute that is used to create unique VPN IPv4 prefixes for each VPN in an MPLS network. The RD is a 64-bit value that consists of two parts: an administrator field and an assigned number field. The administrator field can be an AS number or an IP address, and the assigned number field can be any arbitrary value chosen by the administrator. The RD is prepended to the IPv4 prefix to create a VPN IPv4 prefix that can be advertised across the MPLS network without causing any overlap or conflict with other VPNs. In this question, we have two PE routers (PE-1 and PE-2) that are connected to two CE devices (CE-1 and CE-2) respectively. PE-1 and PE-2 are configured with VRFs named Customer-A and Customer-B respectively.

• Question 10:

  Referring to the 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.)

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

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  Explanation/Reference:

  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.