JN0-660 Exam Questions

For a network running single-area OSPF, how would you decrease the size of the link-state database (LSDB)?

What are Martian addresses on a Junos device?

Which statement correctly describes the difference between a generated and an aggregate route?

Which statement is true regarding the default master routing instance?

Which routing table contains the route information for the user-defined routing instance called Candidate1?

Which two routing-instance types are used for non-VPN-related applications? (Choose two.)

What are two characteristics of load-balancing implementation on a Junos device? (Choose two.)

A network administrator has been asked to configure the most specific aggregate route to summarize the four specific prefixes shown below: 10. .5.0/24 10. .12.0/24 10. .17.0/24 10....

Which statement correctly describes unified in-service software upgrades (ISSU)?

R0 is a Juniper Networks MX router with dual Routing Engines. You must load new software on R0 while ensuring no control plane disruption and minimal data loss. Which three feature...

What are two ways that nonstop routing works? (Choose two.)

What are three ways that graceful Routing Engine switchover provides redundancy? (Choose three.)

Which protocol do multichassis link aggregation group (MC-LAG) devices use to exchange the control information between two MC-LAG network devices?

Which two statements are true about unified ISSU? (Choose two.)

Which high availability feature is enabled by default on Junos devices?

You have a router with dual Routing Engines. You want to ensure that your users experience minimum downtime. You have decided to enable graceful Routing Engine switchover on the ro...

Which OSPF LSA type is sent from the ABR to describe an ASBR that is in an area to which it is connected?

What are two functions of an OSPF BDR? (Choose two.)

Which OSPF adjacency state is reached when a hello packet has been sent, but bidirectional communication has not been established?

What is a reason for an OSPF router to display a designated router ID of 0.0.0.0?

Which two OSPF areas allow external routes? (Choose two.)

Which LSA packet types are originated only by an OSPF ABR router?

In an OSPF environment, which two configuration parameters are used to determine which router is the DR? (Choose two.)

You have entered the show ospf route command and see routes with a metric type of EXT2. What does this indicate?

You want to verify the frequency and type of SPF calculations on your Junos device. Which command displays this information?

You are troubleshooting an OSPF adjacency that is stuck in the ExStart state. What would be the correct step to resolve the problem?

You are asked to redistribute routes into OSPF. Which action accomplishes this task?

You are configuring OSPF on a Junos device; however, you have not configured a router ID. What is the default behavior in this situation?

Which two statements correctly describe IS-IS adjacencies? (Choose two.)

Which IS-IS PDU is used to request a retransmission of a missing link-state packet?

Which statement is true regarding the IS-IS designated intermediate system (DIS)?

You want to establish an IS-IS Level 1 adjacency between two routers. The adjacency is not forming. Which three reasons would account for this issue? (Choose three.)

Which three statements are true regarding the IS-IS link-state database (LSDB)? (Choose three.)

Which PDU type is sent by an IS-IS router when it detects that its link-state database is out of date?

What are two similarities between OSPF and IS-IS? (Choose two.)

Which three statements correctly describe IBGP and EBGP interaction? (Choose three.)

Which two statements correctly describe how the AS path attribute is used by BGP? (Choose two.)

Which statement describes the role of local preference in the BGP route selection process?

Which three BGP attributes are used for loop prevention? (Choose three.)

You are attempting to influence return traffic into your autonomous system by preferring one router as an entry point. Which two BGP attributes will affect this behavior? (Choose t...

Which three BGP attributes must be sent to EBGP peers? (Choose three.)

What is a valid BGP neighbor state?

Which statement is true regarding BGP?

A route to the same destination is received from two different BGP sources. Which criterion is considered first to determine the active BGP route?

You are troubleshooting a BGP-learned prefix that is not being installed in the routing table. Which command shows you the missing route?

You are asked to configure a new external BGP connection to a peer's loopback interface. You verify that the peer's loopback interface is reachable, but the BGP connection remains...

Which two statements are true about virtual switches? (Choose two.)

In Q-in-Q tunneling, what is the purpose of the pop-swap operation?

What are three components of the tag portion of an 802.1Q-tagged Ethernet frame? (Choose three.)

Which three mechanisms are used by switches to build and maintain bridge tables? (Choose three.)