Juniper JN0-664 Online Practice Questions and Exam Preparation

Juniper JN0-664 Online Questions & Answers

• Question 41:

  Which statement is correct about IS-IS when it performs the Dijkstra algorithm?

  A. The local router moves its own local tuples into the candidate database
  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. Tuples with the lowest cost are moved from the tree database to the LSDB.
  D. 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

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  Explanation/Reference:

• Question 42:

  Which two statements describe PIM-SM? (Choose two)

  A. Routers with receivers send join messages to their upstream neighbors.
  B. Routers without receivers must periodically prune themselves from the SPT.
  C. Traffic is initially flooded to all routers and an S,G is maintained for each group
  D. Traffic is only forwarded to routers that request to join the distribution tree.
  A. Routers with receivers send join messages to their upstream neighbors.
  D. Traffic is only forwarded to routers that request to join the distribution tree.

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  Explanation/Reference:

  PIM sparse mode (PIM-SM) is a multicast routing protocol that uses a pull model to deliver multicast traffic. In PIM-SM, routers with receivers send join messages to their upstream neighbors toward a rendezvous point (RP) or a source-specific tree (SPT). The RP or SPT acts as the root of a shared distribution tree for a multicast group. Traffic is only forwarded to routers that request to join the distribution tree by sending join messages. PIM-SM does not flood traffic to all routers or prune routers without receivers, as PIM dense mode does.

• Question 43:

  What is the correct order of packet flow through configurable components in the Junos OS CoS features?

  A. Multifield Classifier -> Behavior Aggregate Classifier -> Input Policer -> Forwarding Policy Options -> Fabric Scheduler -> Output Policer -> Rewrite Marker -> Scheduler/Shaper/RED
  B. Behavior Aggregate Classifier -> Multifield Classifier -> Input Policer -> Forwarding Policy Options -> Fabric Scheduler -> Output Policer -> Scheduler/Shaper/RED -> Rewrite Marker
  C. Behavior Aggregate Classifier -> Input Policer -> Multifield Classifier -> Forwarding Policy Options -> Fabric Scheduler -> Output Policer -> Scheduler/Shaper/RED -> Rewrite Marker
  D. Behavior Aggregate Classifier -> Multifield Classifier -> Input Policer -> Forwarding Policy Options -> Fabric Scheduler -> Scheduler/Shaper/RED -> Output Policer -> Rewrite Marker
  B. Behavior Aggregate Classifier -> Multifield Classifier -> Input Policer -> Forwarding Policy Options -> Fabric Scheduler -> Output Policer -> Scheduler/Shaper/RED -> Rewrite Marker

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  Explanation/Reference:

• Question 44:

  Your organization manages a Layer 3 VPN for multiple customers To support advanced route than one BGP community on advertised VPN routes to remote PE routers. Which routing-instance configuration parameter would support this requirement?

  A. vrf-export
  B. vrf-import
  C. vrf-target export
  D. vrf-target import
  A. vrf-export

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  Explanation/Reference:

• Question 45:

  Referring to the exhibit

  

  You want to use both links between R1 and R2 Because of the bandwidth difference between the two links, you must ensure that the links are used as much as possible. Which action will accomplish this goal?

  A. Define a policy to tag routes with the appropriate bandwidth community.
  B. Disable multipath.
  C. Ensure that the metric-out parameter on the Gigabit Ethernet interface is higher than the 10 Gigibit Ethernet interface.
  D. Enable per-prefix load balancing.
  A. Define a policy to tag routes with the appropriate bandwidth community.

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  Explanation/Reference:

• Question 46:

  Referring to the exhibit.

  

  Which two statements are true? (Choose two.)

  A. The multihop configuration is used for load balancing.
  B. This route is learned from the same AS number.
  C. This route is learned from two different AS numbers.
  D. The multipath configuration is used for load balancing.
  B. This route is learned from the same AS number.
  D. The multipath configuration is used for load balancing.

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  Explanation/Reference:

• Question 47:

  Referring to the exhibit.

  

  What must be changed to establish a Level 1 adjacency between routers R1 and R2?

  A. Change the level l disable parameter under the R1 protocols isis interface lo0.0 hierarchy to the level 2 disable parameter.
  B. Remove the level i disable parameter under the R2 protocols isis interface loo . 0 configuration hierarchy.
  C. Change the level 1 disable parameter under the R2 protocols isis interface ge-1/2/3 .0 hierarchy to the level 2 disable parameter
  D. Add IP addresses to the interface ge-l/2/3 unit 0 family iso hierarchy on both R1 and R2.
  B. Remove the level i disable parameter under the R2 protocols isis interface loo . 0 configuration hierarchy.

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  Explanation/Reference:

  IS-IS routers can form Level 1 or Level 2 adjacencies depending on their configuration and network topology. Level 1 routers are intra-area routers that share the same area address with their neighbors. Level 2 routers are inter-area routers

  that can connect different areas. Level 1-2 routers are both intra-area and inter-area routers that can form adjacencies with any other router.

  In the exhibit, R1 and R2 are in different areas (49.0001 and 49.0002), so they cannot form a Level 1 adjacency. However, they can form a Level 2 adjacency if they are both configured as Level 1-2 routers. R1 is already configured as a Level

  1-2 router, but R2 is configured as a Level 1 router only, because of the level 1 disable command under the lo0.0 interface. This command disables Level 2 routing on the loopback interface, which is used as the router ID for IS-IS.

  Therefore, to establish a Level 1 adjacency between R1 and R2, the level 1 disable command under the R2 protocols isis interface lo0.0 hierarchy must be removed. This will enable Level 2 routing on R2 and allow it to form a Level 2

  adjacency with R1.

• Question 48:

  Referring to the exhibit.

  

  The environment is using BGP All devices are in the same AS with reachability redundancy Referring to the exhibit, which statement is correct?

  A. RR1 is peered to Client2 and RR2
  B. RR2 is in an OpenConfirm State until RR1 becomes unreachable.
  C. Client1 is peered to Client2 and Client3.
  D. Peering is dynamically discovered between all devices.
  A. RR1 is peered to Client2 and RR2

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  Explanation/Reference:

  BGP route reflectors are BGP routers that are allowed to ignore the IBGP loop avoidance rule and advertise IBGP learned routes to other IBGP peers under specific conditions. BGP route reflectors can reduce the number of IBGP sessions

  and updates in a network by eliminating the need for a full mesh of IBGP peers. BGP route reflectors can have three types of peerings:

  EBGP neighbor: A BGP router that belongs to a different autonomous system (AS) than the route reflector.

  IBGP client neighbor: An IBGP router that receives reflected routes from the route reflector. A client does not need to peer with other clients or non-clients. IBGP non-client neighbor: An IBGP router that does not receive reflected routes from

  the route reflector. A non-client needs to peer with other non-clients and the route reflector.

  In the exhibit, we can see that RR1 and RR2 are route reflectors in the same AS with reachability redundancy. They have two types of peerings: EBGP neighbors (R1 and R4) and IBGP client neighbors (Client1, Client2, and Client3). RR1

  and RR2 are also peered with each other as IBGP non-client neighbors.

• Question 49:

  You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target: 65100:100 statement in your routing instance. In this scenario, which two statements describe the vrf-target configuration? (Choose two.)

  A. This value is used to identify BGP routes learned from the remote PE device.
  B. This value is used to add a target community to BGP routes advertised to the local CE device.
  C. This value is used to add a target community to BGP routes advertised to the remote PE device.
  D. This value is used to identify BGP routes learned from the local CE device.
  A. This value is used to identify BGP routes learned from the remote PE device.
  C. This value is used to add a target community to BGP routes advertised to the remote PE device.

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  Explanation/Reference:

• Question 50:

  Referring to the exhibit.

  

  You must ensure that the VPN backbone is preferred over the back door intra-area link as long as the VPN is available.

  Which action will accomplish this task?

  A. Configure an import routing policy on the CE routers that rejects OSPF routes learned on the backup intra-area link.
  B. Enable OSPF traffic-engineering.
  C. Configure the OSPF metric on the backup intra-area link that is higher than the L3VPN link.
  D. Create an OSPF sham link between the PE routers.
  D. Create an OSPF sham link between the PE routers.

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  Explanation/Reference:

  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. To create a sham link, you need to configure the local and remote addresses of the PE routers under the [edit protocols ospf area area-id] hierarchy level1.