Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 61:

  Which statement correctly describes a characteristic of IPv6 unicast addressing?

  A. Global addresses are in the range of 2002::/16.

  B. Only one loopback address exists, ::1/128.

  C. Link-local addresses are in the range of FF00::/8.

  D. Link-local addresses are in the range of FE00::/12.

  Correct Answer: B

• Question 62:

  You are establishing RSVP LSPs through your MPLS-enabled network. You are asked to ensure that the LSPs will support end-to-end class-of-service handling. Which statement is correct in this scenario?

  A. Configure ultimate-hop-popping on the egress device.

  B. Configure implicit-null on all MPLS-enabled devices.

  C. Configure explicit-null on all MPLS-enabled devices.

  D. Configure entropy-label on the egress device.

  Correct Answer: A

• Question 63:

  What are three label operations that an MPLS-enabled router performs? (Choose three.)

  A. swap

  B. push

  C. pop

  D. insert

  E. rewrite

  Correct Answer: ABC

• Question 64:

  Which two routing protocols make use of a designated router, or pseudo node, to represent a broadcast network? (Choose two.)

  A. BGP

  B. OSPF

  C. MPLS

  D. IS-IS

  Correct Answer: BD

• Question 65:

  Click the Exhibit.

  

  Referring to the exhibit, what is the result of applying this policy?

  A. The 172.18.1.0/24 prefix will be redistributed into OSPF as an internal route.

  B. The 172.18.1.1/32 prefix will be redistributed into OSPF as an external route.

  C. The 172.18.1.0/24 prefix will be redistributed into OSPF as an external route.

  D. The 172.18.1.1/32 prefix will be redistributed into OSPF as an internal route.

  Correct Answer: C

• Question 66:

  Which statement is true about link aggregation?

  A. It facilitates control plane redundancy through link aggregation

  B. It provides an active-passive failover mechanism for redundant Layer 2 links

  C. It combines multiple Ethernet interfaces into a single link-layer interface

  D. It combines multiple Ethernet interfaces into a multilink-layer interface.

  Correct Answer: C

  The IEEE 802.3ad link aggregation specification enables multiple Ethernet interfaces to be grouped together and form a single link layer interface, also known as a link aggregation group (LAG) or bundle. The physical links participating in a LAG are known as member links. LAGs are commonly used to aggregate trunk links between access and aggregation switches.

• Question 67:

  Which two statements are true about unified in-service software upgrade (ISSU)? (Choose two.)

  A. Unified ISSU is supported only on dual Routing Engine (RE) platforms

  B. To perform a unified ISSU, it is not necessary for the master RE and backup RE to be running the same version of the Junos OS

  C. Unified ISSUE causes minimal disruption on both the control and forwarding planes

  D. Graceful Routing Engine Switchover (GRES) and nonstop active routing (NSR) must be enabled to perform a unified ISSU

  Correct Answer: AD

  Unified ISSU enables you to upgrade between two different Junos OS releases with no disruption on the control plane and with minimal disruption of traffic. Unified ISSUE is supported only on dual RE platforms. In addition, GRES and NSR must be enabled. The RE's must be running the same software release before you can perform a unified ISSU.

• Question 68:

  You have recently installed a second Routing Engine (RE) in your Junos device and implemented Graceful Routing Engine Switchover (GRES).

  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: BC

  Once the RE's are synchronized, they exchange keepalives. If the backup RE does not receive a keepalive from the master RE after a specified timeout (typically 2 seconds), it determines that the master RE has failed and takes mastership. When a mastership change occurs, the PFE seamlessly disconnects from the old master RE and reconnects to the new master RE. The PFE does not reboot and continues forwarding traffic based on the existing forwarding table entries.

• Question 69:

  What is the default value of the TTL in a VRRP advertisement?

  A. 0

  B. 1

  C. 64

  D. 255

  Correct Answer: D

  The VRRP advertisement packet uses a time-to-live (TTL) value of 255 and cannot be forwarded beyond the local subnet on which it is sent. This value cannot be adjusted, and any packet that has a TTL value other than 255 is discarded.

• Question 70:

  What is a requirement for link aggregation?

  A. Member links must be on contiguous ports

  B. Member links must be on the same switch in a Virtual Chassis

  C. The speed of the member links must be the same

  D. LACP must be configured

  Correct Answer: C

  Both the duplex and the speed of the member interfaces must match. Member links need not be contiguous nor on the same chassis. LACP does not have to be configured for a LAG to operate.