Juniper JN0-351 Online Practice Questions and Exam Preparation

Juniper JN0-351 Online Questions & Answers

• Question 91:

  You want to ensure traffic is routed through a GRE tunnel.

  In this scenario, which two statements will satisfy this requirement? (Choose two.)

  A. Tunnel endpoints must have a route that directs traffic into the tunnel.
  B. All intermediary devices must have a route to the tunnel endpoints.
  C. Keepalives must be used on stateless tunneling protocols.
  D. BFD must be used on the stateless tunneling protocols.
  A. Tunnel endpoints must have a route that directs traffic into the tunnel.
  B. All intermediary devices must have a route to the tunnel endpoints.

  ---

  Explanation/Reference:

  Option A is correct. For traffic to be sent through a GRE tunnel, there must be a route that directs the traffic into the tunnel. This is typically accomplished through the use of a static route or a dynamic routing protocol.

  Option B is correct. All intermediary devices must have a route to the tunnel endpoints34. In real-world scenarios, the tunnel endpoints for a tunnel going over the Internet must have globally reachable internet addresses. Otherwise, intermediate routers in the Internet cannot forward the tunneled packets.

• Question 92:

  Which two statements about a Virtual Chassis are correct? (Choose two.)

  A. A Virtual Chassis is managed using a single virtual console port.
  B. You must use the same EX Series switch for all members in a Virtual Chassis.
  C. All members in a Virtual Chassis must be running the same Junos version.
  D. Each device must be managed separately.
  A. A Virtual Chassis is managed using a single virtual console port.
  C. All members in a Virtual Chassis must be running the same Junos version.

• Question 93:

  Exhibit

  

  You are a network operator troubleshooting BGP connectivity.

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

  A. Peer 10.32.1.2 is configured for AS 63645.
  B. The BGP session is not established.
  C. The R1 is configured for AS 65400.
  D. The routers are exchanging IPv4 routes.
  B. The BGP session is not established.
  C. The R1 is configured for AS 65400.

  ---

  Explanation/Reference:

  Option B suggests that the BGP session is not established. This is correct because in the output, the state of the BGP session is shown as "Idle". In BGP, an "Idle" state means that the BGP session is not currently established1.

  Option C suggests that R1 is configured for AS 65400. This is also correct because in the output, it's shown that the local AS number is 654001. The local AS number represents the Autonomous System (AS) number of the router on which

  you're checking the BGP session1.

• Question 94:

  Exhibit

  

  Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.

  Referring to the exhibit, which statement is correct?

  A. The BFD liveness is set too low.
  B. The BFD liveness must be configured on the BGP neighbor.
  C. The BFD liveness must be configured on the BGP group.
  D. The BFD liveness is set too high.
  B. The BFD liveness must be configured on the BGP neighbor.

  ---

  Explanation/Reference:

  The exhibit shows the configuration of BFD liveness detection for BGP at the global level, which applies to all BGP neighbors by default1. However, this configuration does not specify the session mode, which determines whether BFD uses

  single-hop or multihop mode to communicate with a neighbor2. For single-hop BGP neighbors, which are directly connected on the same subnet, the session mode can be either automatic or single-hop. For multihop BGPneighbors, which are

  not directly connected and require multiple hops to reach, the session mode must be multihop2.

  Since your BGP neighbors are in different countries, they are likely to be multihop neighbors. Therefore, you need to configure the session mode as multihop for each neighbor individually at the [edit protocols bgp group group-name neighbor

  address bfd-liveness-detection] hierarchy level2. For example:

  protocols { bgp { group usa { neighbor 192.0.2.1 { bfd-liveness-detection { session-mode multihop; } } } group france { neighbor 198.51.100.1 { bfd-liveness-detection { session-mode multihop; } } } } }

  If you do not configure the session mode for multihop neighbors, BFD will use the default mode of automatic, which will try to use single-hop mode and fail to establish a BFD session with the remote neighbor2. This will prevent BGP from

  using BFD to detect liveliness and failover.

  Therefore, the answer B is correct, as you need to configure the BFD liveness detection on the BGP neighbor level with the appropriate session mode for multihop neighbors.

• Question 95:

  What are three reasons a BGP route would be hidden? (Choose three.)

  A. The AS Path contains a 0.
  B. It is suppressed by a damping policy.
  C. The Local Preference is 0.
  D. The next hop is unreachable.
  E. It is rejected by a firewall term.
  A. The AS Path contains a 0.
  B. It is suppressed by a damping policy.
  D. The next hop is unreachable.

• Question 96:

  You have two routers unable to form an IS-IS Level 1 adjacency.

  Which two statements describe a reason for this problem? (Choose two.)

  A. The MTU is set to 1500.
  B. Interface lo0 is not included as an IS-IS interface.
  C. The area numbers are different.
  D. The interfaces are on different subnets.
  C. The area numbers are different.
  D. The interfaces are on different subnets.

• Question 97:

  Exhibit.

  

  You want to enable redundancy for the EBGP peering between the two routers shown in the exhibit. Which three actions will you perform in this scenario? (Choose three.)

  A. Configure BGP multihop.
  B. Configure loopback interface peering.
  C. Configure routes for the peer loopback interface IP addresses.
  D. Configure an MD5 peer authentication.
  E. Configure a cluster ID.
  A. Configure BGP multihop.
  B. Configure loopback interface peering.
  C. Configure routes for the peer loopback interface IP addresses.

  ---

  Explanation/Reference:

  A is correct because you need to configure BGP multihop to enable redundancy for the EBGP peering between the two routers. BGP multihop is a feature that allows BGP peers to establish a session over multiple hops, instead of requiring them to be directly connected1. By default, EBGP peers use a time-to-live (TTL) value of 1 for their packets, which means that they can only reach adjacent neighbors1. However, if you configure BGP multihop with a higher TTL value, you can allow EBGP peers to communicate over multiple routers in between1. This can provide redundancy in case of a link failure or a router failure between the EBGP peers. B is correct because you need to configure loopback interface peering to enable redundancy for the EBGP peering between the two routers. Loopback interface peering is a technique that uses loopback interfaces as the source and destination addresses for BGP sessions, instead of physical interfaces2. Loopback interfaces are virtual interfaces that are always up andreachable as long as the router is operational2. By using loopback interface peering, you can avoid the dependency on a single physical interface or link for the BGP session, and use multiple paths to reach the loopback address of the peer2. This can provide redundancy and load balancing for the EBGP peering. C is correct because you need to configure routes for the peer loopback interface IP addresses to enable redundancy for the EBGP peering between the two routers. Routes for the peer loopback interface IP addresses are necessary to ensure that the routers can reach each other's loopback addresses over multiple hops2. You can use static routes or dynamic routing protocols to advertise and learn the routes for the peer loopback interface IP addresses2. Without these routes, the routers will not be able to establish or maintain the BGP session using their loopback interfaces.

• Question 98:

  On EX Series devices, what are two software features that accommodate redundancy? (Choose two.)

  A. OAM
  B. NSR
  C. IGMP
  D. GRES
  B. NSR
  D. GRES

• Question 99:

  You are asked to configure filter-based forwarding (FBF) to forward traffic sourced from a specific subnet to a webserver.

  In this scenario, which mechanism is used to add interface routes to the forwarding routing instance used in FBF?

  A. generated routes
  B. RIB groups
  C. forwarding policy
  D. routing policy
  B. RIB groups

• Question 100:

  You are configuring IBGP and you must ensure that reachability is maintained between participating routers, even if the physical topology changes.

  Which two actions should you perform in this scenario? (Choose two.)

  A. Configure DHCP on all IBGP devices.
  B. Configure an IGP within your IBGP network.
  C. Configure static routes to all IBGP peers.
  D. Configure IBGP peerings to loopback addresses.
  B. Configure an IGP within your IBGP network.
  D. Configure IBGP peerings to loopback addresses.