Juniper JN0-664 Online Practice Questions and Exam Preparation

Juniper JN0-664 Online Questions & Answers

• Question 11:

  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 discarded.
  B. The packet will be processed by the BA classifier first, then the MF classifier.
  C. The packet will be forwarded with no classification changes.
  D. The packet will be processed by the MF classifier first, then the BA classifier.
  B. The packet will be processed by the BA classifier first, then the MF classifier.

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  Explanation/Reference:

• Question 12:

  You are using a Layer 3 VPN to connect two customer sites. The VPN routes for the customer networks appear as hidden in the bgp.l3vpn.0 routing table on the PE routers. What is causing this problem?

  A. The routes use overlapping IP addresses.
  B. There is a routing loop in the service provider backbone.
  C. There is not an established MPLS LSP between the two PE routers.
  D. Route targets are not configured.
  C. There is not an established MPLS LSP between the two PE routers.

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  Explanation/Reference:

• Question 13:

  You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network.

  In this scenario, which statement is correct?

  A. You must assign a unique site number to each attached site's configuration.
  B. This type of VPN only supports Ethernet interfaces when connecting to CE devices.
  C. This type of VPN requires the support of the inet-vpn NLRI on all core BGP devices
  D. You must use the same route-distinguiaher value on both PE devices.
  D. You must use the same route-distinguiaher value on both PE devices.

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  Explanation/Reference:

• Question 14:

  Referring to the exhibit.

  

  You want Site 1 to access three VLANs that are located in Site 2 and Site 3 The customer- facing interface on the PE-1 router is configured for Ethernet-VLAN encapsulation. What is the minimum number of L2VPN routing instances to be configured to accomplish this task?

  A. 1
  B. 3
  C. 2
  D. 6
  B. 3

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  Explanation/Reference:

  To allow Site 1 to access three VLANs that are located in Site 2 and Site 3, you need to configure three L2VPN routing instances on PE-1, one for each VLAN. Each L2VPN routing instance will have a different VLAN ID and a different VNI for VXLAN encapsulation. Each L2VPN routing instance will also have a different vrf-target export value to identify which VPN routes belong to which VLAN. This way, PE-1 can forward traffic from Site 1 to Site 2 and Site 3 based on the VLAN tags and VNIs.

• Question 15:

  Referring to the exhibit.

  

  A network is using IS-IS for routing.

  In this scenario, why are there two TLVs shown in the exhibit?

  A. There are both narrow and wide metric devices in the topology
  B. The interface specified a metric of 100 for L2.
  C. Wide metrics have specifically been requested
  D. Both IPv4 and IPv6 are being used in the topology
  A. There are both narrow and wide metric devices in the topology

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  Explanation/Reference:

  TLVs are tuples of (Type, Length, Value) that can be advertised in IS-IS packets. TLVs can carry different kinds of information in the Link State Packets (LSPs). IS- IS supports both narrow and wide metrics for link costs. Narrow metrics use a single octet to encode the link cost, while wide metrics use three octets. Narrow metrics have a maximum value of 63, while wide metrics have a maximum value of 16777215. If there are both narrow and wide metric devices in the topology, IS-IS will advertise two TLVs for each link: one with the narrow metric and one with the wide metric. This allows backward compatibility with older devices that only support narrow metrics12.

• Question 16:

  Referring to the exhibit.

  

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

  A. Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10
  B. Joins for any group are accepted if the group count value is less than 25.
  C. Joins for group 224.7.7.7 are always rejected, regardless of the group count.
  D. Joins for group 224.7.7.7 are accepted if the group count is less than 25
  A. Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10

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  Explanation/Reference:

• Question 17:

  Referring to the exhibit

  

  CE-1 is providing NAT services for the hosts at Site 1 and you must provide Internet access for those hosts. Which two statements are correct in this scenario? (Choose two.)

  A. You must configure a static route in the main routing instance for the 10 1 2.0/24 prefix that uses the VPN-A.inet.0 table as the next hop
  B. You must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.
  C. You must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.0 table.
  D. You must configure a RIB group on PE-1 to leak the 10 1 2.0/24 prefix from the VPN-inet.0 table to the inet.0 table.
  B. You must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.
  C. You must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.0 table.

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  Explanation/Reference:

• Question 18:

  Referring to the exhibit.

  

  R1 and R8 are not receiving each other's routes

  Referring to the exhibit, what are three configuration commands that would solve this problem? (Choose three.)

  A. ConAS 64497 toward AS 64498.
  B. ConAS 64500 toward AS 64512.
  C. ConAS 64500 toward AS 64499.
  D. Conpeer-as on routers in AS 64497 and AS 64450.
  E. ConAS 65412 and advertise-peer-as on routers in AS 64498.
  A. ConAS 64497 toward AS 64498.
  B. ConAS 64500 toward AS 64512.
  C. ConAS 64500 toward AS 64499.

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  Explanation/Reference:

• Question 19:

  Click the Exhibit button.

  

  After adding Customer C to your Layer 3 VPN. you must ensure that PE2 is receiving VPN routes for all customers attached to PE1, as shown in the exhibit. Which operational command displays this information?

  A. show route table inet.0
  B. show route table bgp.l3vpn.0
  C. show route table customer-c.inet.0
  D. show route summary
  B. show route table bgp.l3vpn.0

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  Explanation/Reference:

• Question 20:

  Referring to the exhibit.

  

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

  A. The PE is attached to a single local site.
  B. The connection has not flapped since it was initiated.
  C. There has been a VLAN ID mismatch.
  D. The PE router has the capability to pop flow labels
  A. The PE is attached to a single local site.
  D. The PE router has the capability to pop flow labels

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  Explanation/Reference:

  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.