Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 71:

  Which two statements are true about nonstop active routing (NSR)? (Choose two.)

  A. Graceful Routing Engine Switchover (GRES) must be configured for NSR to function properly

  B. NSR and graceful restart can be enabled at the same time

  C. NSR relies on helper support on neighboring devices

  D. When NSR is enabled, the rpd process runs on the backup Routing Engine

  Correct Answer: AD

  In addition to maintaining interface and kernel information, NSR also saves routing protocol information by running the rpd process on the backup RE. By saving this additional information, NSR is self-contained and does not rely on helper routers to assist the routing platform in restoring routing protocol information. In addition to enabling NSR and GRES, you should also ensure that the commit operation synchronizes the configuration file by adding the commit synchronize statement under the [edit system] hierarchy.

• Question 72:

  On a Junos device with dual Routing Engine (RE), which two statements correctly describe the expected behavior if the primary RE fails? (Choose two.)

  A. The backup RE will assume the master role once the packet forwarding engine (PFE) restarts

  B. The backup RE will immediately assume the master role

  C. The new master RE restarts the routing protocol process (rpd) and establishes any required adjacencies based on the configuration.

  D. The new master RE maintains the existing protocol adjacencies initially established by the previous master RE

  Correct Answer: AC

  When a Junos device has redundant RE's but no HA features enabled, and the master RE fails, the PFE restarts and all hardware and interfaces are discovered by the new master RE. The new master RE starts rpd so that all adjacencies are aware fo the topological changes.

• Question 73:

  You have an OSPF network. On certain applications and links, you need OSPF recovery to be faster than can be provided by OSPF timers. Which protocol would meet this requirement?

  A. BFD

  B. OSPFv3

  C. GRES

  D. NSR

  Correct Answer: A

  Bidirectional Forwarding Detection (BFD) accomplishes this task for a number of protocols, including OSPF.

• Question 74:

  Which three statements are true of GRE tunnels? (Choose three.)

  A. The local tunnel endpoint must have a valid route to the remote endpoint

  B. GRE tunnels must authenticate at both ends fo the tunnel

  C. Tunnel endpoints must have a route that directs traffic into a tunnel

  D. The gr interface can only route packets that are IP protocol packets

  E. All intermediary devices must have a route to the tunnel endpoints

  Correct Answer: ACE

  For proper tunnel operations, this route must resolve to the physical next hop in the end-to-end communications path and should never use a recursive route. The tunnel endpoints also need a route with the tunnel interface as the next hop to direct traffic destined to the remote subnet into the tunnel. The intermediary devices, located in the forwarding path between the tunnel endpoints, must also be able to route each of the tunnel endpoints.

• Question 75:

  Which two statements are true about IP-IP tunnels on Junos devices? (Choose two.)

  A. They support only IP traffic

  B. Tunnel endpoints use the interface ipt

  C. They add no additional overhead to packets

  D. Each tunnel interface is point-to-point

  Correct Answer: AD

  IP-IP tunnels support only IP traffic, and add an additional 20-byte header to a packet. They use the interface name ip, and each interface is point-to-point.

• Question 76:

  Which two statements about GRE tunnels are true? (Choose two.)

  A. GRE can be used to tunnel non-IP protocols, such as IPX

  B. GRE can provide encrypted communication

  C. GRE adds overhead of 16 bytes per packet

  D. GRE can be used to tunnel IPv6 traffic

  Correct Answer: AD

  GRE is a tunneling protocol that can encapsulate a wide variety of Network Layer protocol packet types inside IP tunnels, such as IPX and AppleTalk. GRE tunnels are also commonly used to tunnel IPv6 and MPLS protocol traffic over an IP transport network. GRE adds 24 bytes of overhead to each packet.

• Question 77:

  How much overhead does the IP-IP tunnel header add to an IPv4 packet?

  A. 20 bytes

  B. 32 bytes

  C. 48 bytes

  D. 64 bytes

  Correct Answer: A

  IP-IP is a tunneling protocol used to encapsulate on IP packet in another IP packet. To encapsulate an IP packet using IP-IP encapsulation, an outer IP header is inserted before the packet's existing IP header. The additional IP header adds 20 bytes of overhead to the packet.

• Question 78:

  Which three protocols can be encapsulated within a GRE tunnel on a Junos device? (Choose three.)

  A. AppleTalk

  B. Aggregated Ethernet

  C. IPv6

  D. MPLS

  E. Ethernet

  Correct Answer: ACD

• Question 79:

  Which two interface names can be used within the Junos OS to reference GRE or IP-IP tunnels? (Choose two.)

  A. gr-1/2/0.0

  B. gre-1/2/0.0

  C. ip-2/3/0.0

  D. ipip-2/3/0.0

  Correct Answer: AC

  GRE interfaces are notated as gr; IP-IP interfaces are notated as ip.

• Question 80:

  

  In the network shown in the exhibit, you want to configure a GRE tunnel on Router B that is destined for Router C.

  Which route should be used on Router B to provide reachability to the tunnel destinations?

  A. static route to the loopback address of Router A

  B. static route to the loopback address of Router B

  C. static route to the loopback address of Router C

  D. static route to the loopback address of Router D

  Correct Answer: C

  A GRE tunnel must have a valid route to the remote tunnel endpoint. In this case, Router B must have a route to Router C