Juniper JN0-664 Online Practice Questions and Exam Preparation

Juniper JN0-664 Online Questions & Answers

• Question 81:

  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?

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

  ---

  Explanation/Reference:

  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.

• Question 82:

  Which two statements are correct about the customer interface in an LDP-signaled pseudowire? (Choose two)

  A. When the encapsulation is vlan-ccc or extended-vlan-ccc, the configured VLAN tag is not included in the control plane LDP advertisement
  B. When the encapsulation is ethernet-ccc, only frames without a VLAN tag are accepted in the data plane
  C. When the encapsulation is vLan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement
  D. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.
  C. When the encapsulation is vLan-ccc or extended-vlan-ccc, the configured VLAN tag is included in the control plane LDP advertisement
  D. When the encapsulation is ethemet-ccc, tagged and untagged frames are both accepted in the data plane.

  ---

  Explanation/Reference:

  The customer interface in an LDP-signaled pseudowire is the interface on the PE router that connects to the CE device. An LDP-signaled pseudowire is a type of Layer 2 circuit that uses LDP to establish a point-to-point connection between two PE routers over an MPLS network. The customer interface can have different encapsulation types depending on the type of traffic that is carried over the pseudowire. The encapsulation types are ethernet-ccc, vlan-ccc, extended-vlanccc, atm-ccc, frame-relay- ccc, ppp-ccc, cisco-hdlc-ccc, and tcc-ccc. Depending on the encapsulation type, the customer interface can accept or reject tagged or untagged frames in the data plane, and include or exclude VLAN tags in the control plane LDP advertisement. The following table summarizes the behavior of different encapsulation types:

• Question 83:

  Referring to the exhibit

  

  The PE-to-CE protocol being used is OSPF for the L3VPN. Also, there is an OSPF neighborship between CE-1 and CE-2. Which statement is correct in this situation?

  A. You must set a high metric on the CE-1 to PE-1 link for hosts at Site-1 to use the CE-1 to CE-2 link to reach hosts at Site-2
  B. You must set a high metric on the CE-1 to CE-2 link for hosts at Site-1 to use the L3VPN to reach hosts at Site-2.
  C. Hosts at Site-1 will reach hosts at Site-2 through the CE-1 and CE-2 link by default.
  D. Hosts at Site-1 will reach hosts at Site-2 through the L3VPN by default.
  C. Hosts at Site-1 will reach hosts at Site-2 through the CE-1 and CE-2 link by default.

  ---

  Explanation/Reference:

• Question 84:

  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?

  A. Configure the ignore-attached-bit parameter on all L2 routers.
  B. Configure all routers to allow wide metrics.
  C. Configure all routers to be L1.
  D. Configure the ignore-attached-bit parameter on all L1 routers
  D. Configure the ignore-attached-bit parameter on all L1 routers

  ---

  Explanation/Reference:

  The attached bit is a flag in an IS-IS LSP that indicates whether a router is connected to another area or level (L2) of the network. By default, L2 routers set this bit when they advertise their LSPs to L1 routers, and L1 routers use this bit to select a default route to reach other areas or levels through L2 routers. However, this may result in suboptimal routing if there are multiple L2 routers with different paths to other areas or levels. To ensure that L1 routers have only the most specific routes available from L2 routers, you can configure the ignore-attached-bit parameter on all L1 routers. This makes L1 routers ignore the attached bit and install all interarea routes learned from L2 routers in their routing tables.

• Question 85:

  Referring to the exhibit Click the Exhibit button.

  

  Which statement is correct?

  A. VPN routes are exported with the target:65512:1 and target:65512:2 route targets.
  B. You cannot use the vrf-target and vrf-export statements in the same VRF.
  C. VPN routes with the target:65512:1 and target:65512:2 route targets are imported.
  D. VPN routes are exported with only the target:65512:1 route target
  A. VPN routes are exported with the target:65512:1 and target:65512:2 route targets.

  ---

  Explanation/Reference:

• Question 86:

  Referring to the exhibit.

  

  The network shown in the exhibit is based on IS-IS

  Which statement is correct in this scenario?

  A. The NSEL byte for Area 0001 is 00.
  B. The area address is two bytes.
  C. The routers are using unnumbered interfaces
  D. The system IDofR1_2 is 192.168.16.1
  A. The NSEL byte for Area 0001 is 00.

  ---

  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 addresses to identify routers and areas: system ID and area address. The system ID is a unique identifier for each router in an IS-IS domain. The system ID is 6 octets long and can be derived from the MAC address or manually configured. The area address is a variable-length identifier for each area in an IS-IS domain. The area address can be 1 to 13 octets long and is composed of high-order octets of the address. An IS-IS instance may be assigned multiple area addresses, which are considered synonymous. Multiple synonymous area addresses are useful when merging or splitting areas in the domain. In this question, we have a network based on IS-IS with four routers (R1_1, R1_2, R2_1, and R2_2) belonging to area 0001. The area address for area 0001 is 49.0001. The NSEL byte for area 0001 is the last octet of the address, which is 01. The NSEL byte stands for Network Service Access Point Selector (NSAP Selector) and indicates the type of service requested from the network layer. Therefore, the correct statement in this scenario is that the NSEL byte for area 0001 is 01. References: https://www.cisco.com/c/en/us/td/docs/ios- xml/ios/iproute_isis/configuration/xe-16/irs-xe-16-book/irs-ovrvw-cf.html https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/is-is- routing-overview.html

• Question 87:

  Referring to the exhibit.

  

  PIM-SM is configured on all routers, and Anycast-RP with Anycast- PIM is used for the discovery mechanism on RP1 and RP2. The interface metric values are shown for the OSPF area. In this scenario, which two statements are correct about which RP is used? (Choose two.)

  A. Source2 will use RP2 and Received2 will use RP2 for group 224.2.2.2.
  B. Source2 will use RP1 and Receiver2 will use RP1 for group 224.2.2.2.
  C. Source1 will use RP1 and Receiver1 will use RP1 for group 224.1.1.1.
  D. Source1 will use RP1 and Receiver1 will use RP2 for group 224.1 1 1
  A. Source2 will use RP2 and Received2 will use RP2 for group 224.2.2.2.
  D. Source1 will use RP1 and Receiver1 will use RP2 for group 224.1 1 1

  ---

  Explanation/Reference:

• Question 88:

  Referring to the exhibit,

  

  Click the Exhibit button-Referring to the exhibit, which two statements are correct about BGP routes on R3 that are learned from the ISP-A neighbor? (Choose two.)

  A. By default, the next-hop value for these routes is not changed by R3 before being sent to R1.
  B. By default, the next-hop value for these routes is changed by R3 before being sent to R1.
  C. By default, the BGP local-preference value that is assigned on R3 is advertised to R1.
  D. By default, all BGP attributes values must be removed before advertising the routes to R1.
  A. By default, the next-hop value for these routes is not changed by R3 before being sent to R1.
  C. By default, the BGP local-preference value that is assigned on R3 is advertised to R1.

  ---

  Explanation/Reference:

• Question 89:

  A router running IS-IS is configured with an ISO address of 49.0001.00a0.c96b.c490.00. Which part of this address is the system ID?

  A. c96b.c490 is the system identifier.
  B. c490 is the system identifier.
  C. 00a0.c96b.c490 is the system identifier.
  D. 0001.00a0.c96b.c490 is the system identifier.
  C. 00a0.c96b.c490 is the system identifier.

  ---

  Explanation/Reference:

• Question 90:

  Your network is receiving the 203.0.113.0/24 network using EBGP from AS 64500 and AS 64501. Both of these advertisements have identical local-preference values, AS-path lengths, and BGP origin codes. You want to infiuence the way your AS sends trahe 203.0.113.0/24 network.

  In this scenario, which attribute would you consider next when selecting the best path?

  A. router ID
  B. MED value
  C. peer IP address
  D. IGP metric
  A. router ID

  ---

  Explanation/Reference: