Juniper JN0-664 Online Practice Questions and Exam Preparation

Juniper JN0-664 Online Questions & Answers

• Question 31:

  Referring to the exhibit.

  

  CE-1 must advertise ten subnets to PE-1 using BGP Once CE-1 starts advertising the subnets to PE-1, the BGP peering state changes to Active. Referring to the CLI output shown in the exhibit, which statement is correct?

  A. CE-1 is advertising its entire routing table.
  B. CE-1 is configured with an incorrect peer AS
  C. The prefix limit has been reached on PE-1
  D. CE-1 is unreachable
  B. CE-1 is configured with an incorrect peer AS

  ---

  Explanation/Reference:

  The problem in this scenario is that CE-1 is configured with an incorrect peer AS number for its BGP session with PE-1. The CLI output shows that CE-1 is using AS 65531 as its local AS number and AS 65530 as its peer AS number. However, PE-1 is using AS 65530 as its local AS number and AS 65531 as its peer AS number. This causes a mismatch in the BGP OPEN messages and prevents the BGP session from being established. To solve this problem, CE-1 should configure its peer AS number as 65530 under [edit protocols bgp group external] hierarchy level.

• Question 32:

  Click the Exhibit button.

  

  R2 is receiving the same route from R1 and R3. You must ensure that you can load balance traffic for that route. Referring to the exhibit, which configuration change will allow load balancing?

  A. Configure the multipath parameter under the global BGP configuration.
  B. Apply the prepend policy as an import policy under group R1.
  C. Configure the multipath multiple-as parameter under the global BGP configuration.
  D. Apply the prepend policy as an import policy under group R3.
  C. Configure the multipath multiple-as parameter under the global BGP configuration.

  ---

  Explanation/Reference:

• Question 33:

  Referring to the exhibit.

  

  You enabled a new router (R3) in your network but all destinations using IS-IS routes are not properly load balancing over this new router. What is the problem?

  A. R2 is missing internal routes for R1.
  B. R1 is missing internal routes for R2.
  C. R3 does not have wide-metrics enabled.
  D. R1 does not have wide-metrics enabled.
  C. R3 does not have wide-metrics enabled.

  ---

  Explanation/Reference:

• Question 34:

  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.)

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

  ---

  Explanation/Reference:

  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.

• Question 35:

  You have an L2VPN connecting two CEs across a provider network that runs OSPF. You have OSPF configured on both CEs. Which two statements are correct in this scenario? (Choose two.)

  A. OSPF neighborship is formed between the CEs and PEs.
  B. OSPF neighborship is formed between the two CEs.
  C. The CE and PE OSPF areas must match.
  D. The CE and PE OSPF areas can be different.
  B. OSPF neighborship is formed between the two CEs.
  D. The CE and PE OSPF areas can be different.

  ---

  Explanation/Reference:

• Question 36:

  You are configuring anycast RP for load balancing and redundancy in your PIM-SM domain.

  You want to share active sources between RPs.

  In this scenario, what are two solutions that will accomplish this task? (Choose two.)

  A. Configure MSDP on each RP router.
  B. Configure anycast PIM with the rp-set statement on each RP router.
  C. Configure anycast PIM with the rp-set statement on each source DR router.
  D. Configure MSDP on each source DR router.
  A. Configure MSDP on each RP router.
  B. Configure anycast PIM with the rp-set statement on each RP router.

  ---

  Explanation/Reference:

  Configure MSDP on each RP router: MSDP (Multicast Source Discovery Protocol) is used to share active multicast sources between RPs (Rendezvous Points) in different multicast domains. By configuring MSDP on each RP router, they can exchange information about active multicas sources, ensuring that all RPs are aware of the sources available. B. Configure anycast PIM with the rp-set statement on each RP router: Anycast PIM (Protocol Independent Multicast) allows multiple RPs to share the same IP address, providing load balancing and redundancy. By configuring anycast PIM with the rp-set statement on each RP router, they can function as anycast RPs, and the rp-set statement ensures that they share active sources between them.

• Question 37:

  Referring to the exhibit.

  

  The 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden. What are two solutions that will solve this problem? (Choose two.)

  A. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
  B. Add the external interface prefix to the IGP routing tables
  C. Add the internal interface prefix to the BGP routing tables.
  D. On R4, create a policy to change the BGP next hop to 172.16.1.1 and apply it to IBGP as an export policy
  A. On R4, create a policy to change the BGP next hop to itself and apply it to IBGP as an export policy
  B. Add the external interface prefix to the IGP routing tables

  ---

  Explanation/Reference:

  the default behavior for iBGP is to propagate EBGP-learned prefixes without changing the next-hop. This can cause issues if the next-hop is not reachable via the IGP. One solution is to use the next-hop self command on R4, which will

  change the next-hop attribute to its own loopback address. This way, R5 can reach the next-hop via the IGP and install the route in its routing table.

  Another solution is to add the external interface prefix (120.0.4.16/30) to the IGP routing tables of R4 and R5. This will also make the next-hop reachable via the IGP and allow R5 to use the route. According to 2, this is a possible workaround

  for a pure IP network, but it may not work well for an MPLS network.

• Question 38:

  Referring to the exhibit

  

  CE-1 and CE-2 are part of a VPLS called Customer1 No connectivity exists between CE-1 and CE-2. In the process of troubleshooting, you notice PE-1 is not learning any routes for this VPLS from PE-2, and PE-2 is not learning any routes for this VPLS from PE-1.

  A. The route target must match on PE-1 and PE-2.
  B. The route distinguisher must match on PE-1 and PE-2.
  C. The instance type should be changed to I2vpn.
  D. The no-tunnel-services statement should be deleted on both PEs.
  A. The route target must match on PE-1 and PE-2.

  ---

  Explanation/Reference:

  VPLS is a technology that provides Layer 2 VPN services over an MPLS network. VPLS uses BGP as its control protocol to exchange VPN membership information between PE routers. The route target is a BGP extended community attribute that identifies which VPN a route belongs to. The route target must match on PE routers that participate in the same VPLS instance, otherwise they will not accept or advertise routes for that VPLS.

• Question 39:

  Which statement is true regarding BGP FlowSpec?

  A. It uses a remote triggered black hole to protect a network from a denial-of-service attack.
  B. It uses dynamically created routing policies to protect a network from denial-of-service attacks
  C. It is used to protect a network from denial-of-service attacks dynamically
  D. It verifies that the source IP of the incoming packet has a resolvable route in the routing table
  C. It is used to protect a network from denial-of-service attacks dynamically

  ---

  Explanation/Reference:

• Question 40:

  Referring to the exhibit, which two statements are true? (Choose two.)

  

  A. This route is learned through EBGP
  B. This is an EVPN Type-2 route.
  C. The device advertising this route into EVPN is 192.168.101.5.
  D. The devices advertising this route into EVPN are 10 0 2 12 and 10.0.2.22.
  B. This is an EVPN Type-2 route.
  C. The device advertising this route into EVPN is 192.168.101.5.

  ---

  Explanation/Reference:

  This is an EVPN Type-2 route, also called a MAC/IP advertisement route, that is used to advertise host IP and MAC address information to other VTEPs in an EVPN network. The route type field in the EVPN NLRI has a value of 2, indicating a Type-2 route. The device advertising this route into EVPN is 192.168.101.5, which is the IP address of the VTEP that learned the host information from the local CE device. This IP address is carried in the MPLS label field of the route as part of the VXLAN encapsulation.