Jn0-360 Certifications Book

By Author: Peter Baumann
Total Articles: 19
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Question: 1

Which two statements are true about MPLS VPNs? (Choose two.)

A. With Layer 3 VPNs, the provider’s routers participate in the customer’s Layer 3 routing.
B. MPLS VPNs are designed to run over private networks rather than the public Internet.
C. With Layer 2 VPNs, the provider does not participate in the routing of the customer’s private IP traffic.
D. MPLS VPN tunnels are always encrypted.

Answer: A,C

Question: 2

Which label operation is performed by an MPLS transit router?

A. inject
B. pop
C. push
D. swap

Answer: D

http://www.juniper.net/techpubs/software/junos-security/junos-security96/junos-security-swconfig-interfaces-and-routing/mpls-ov.html

Question: 3

Which Junos platform supports provider bridging?

A. T Series devices
B. SRX Series devices
C. MX Series devices
D. MAG Series devices

Answer: B

http://www.juniper.net/techpubs/en_US/junos10.0/information-products/pathway-pages/mx-series/ethernet-switching-mx-series.html

Question: ...
... 4

In which environment would you run BGP?

A. a company spread across multiple floors of a building
B. a company with a single office
C. a home network
D. the public Internet

Answer: D

Question: 5

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

A. Implement RIP as an overlay protocol on all devices.
B. Add more devices to the OSPF network to help with LSDB processing.
C. Reduce the frequency of hello timers throughout the network.
D. Implement OSPF areas.

Answer: D

Question: 6

What are Martian addresses on a Junos device?

A. IP addresses that are reserved for use only with MPLS VPNs.
B. IP addresses that are never installed in the routing table.
C. IP addresses that are reserved for use only with GRE tunnels.
D. IP addresses specifically used for out-of-band management.

Answer: B

Question: 7

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

A. An aggregate route can be a supernet whereas generated routes are classful.
B. A generated route has a forwarding next hop that is inherited from a contributing route.
C. An aggregate route has a forwarding next hop that is inherited from a contributing route.
D. Only aggregate routes can be re-advertised through BGP using a policy.

Answer: B

Question: 8

Which statement is true regarding the default master routing instance?

A. All IPv4 routes in the master routing instance are shared with user-defined routing instances.
B. Interface routes in the master routing instance are shared with user-defined routing instances.
C. Routes in the master routing instance are not shared with user-defined routing instances.
D. All routes in the master routing instance are shared with user-defined routing instances.

Answer: C

Question: 9

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

A. inet.Candidate1.0
B. Candidate1.inet.0
C. inet.0
D. Candidate1-inet.0

Answer: B

Question: 10

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

A. virtual-router
B. vrf
C. forwarding
D. vpls

Answer: A,C

Question: 11

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

A. It balances packets on a per-packet basis.
B. It balances packets on a per-flow basis.
C. It is enabled through a policy.
D. It is enabled by default.

Answer: B,C

Question: 12

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. .21.0/24
Which configuration completes this task?

A. [edit routing-options]user@router# showaggregate {route 10. .0.0/19;}
B. [edit routing-options]user@router# showaggregate {route 10. .0.0/20;}
C. [edit routing-options]user@router# showaggregate {route 10. .0.0/21;}
D. [edit routing-options]user@router# showaggregate {route 10. .0.0/18;}

Answer: A

Question: 13

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

A. Unified ISSU is built upon graceful-restart extensions to allow upgrades with no impact to the data plane.
B. Unified ISSU is supported on systems with single or dual Routing Engines.
C. Unified ISSU permits both upgrades and downgrades with no control plane disruption and is based on the graceful Routing Engine switchover (GRES) feature.
D. Unified ISSU is based on nonstop-routing (NSR) and graceful Routing Engine switchover (GRES), and permits software upgrades only.

Answer: D

Question: 14

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 features meet the requirement? (Choose three.)

A. graceful restart
B. NSR
C. graceful Routing-Engine switchover (GRES)
D. unified ISSU
E. BFD

Answer: B,C,D

Question: 15

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

A. by enabling redundant REs to switch from primary RE to backup RE
B. by alerting peer nodes of any routing table changes
C. by enabling redundant REs to run a different version of the Junos OS
D. by replicating routing protocol information

Answer: A,D

Question: 16

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

A. by preserving interface and kernel information
B. by reducing time of RE failover
C. by preserving the data plane information
D. by preserving the control plane information
E. by not restarting the PFE

Answer: A,B,E

Question: 17

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

A. Virtual Chassis Control Protocol
B. Multichassis Link Aggregation Protocol
C. Link Aggregation Control Protocol
D. Inter-chassis Control Protocol

Answer: D

Question: 18

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

A. It allows gradual implementation of new features.
B. It reduces operating costs while delivering higher service levels.
C. It involves network down time during software image upgrades.
D. It requires graceful Routing Engine switchover (GRES) and nonstop active routing (NSR).

Answer: B,D

Question: 19

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

A. nonstop active routing
B. root protection
C. nonstop forwarding
D. graceful Routing Engine switchover

Answer: C

Question: 20

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 router.
Which output accomplishes this task?

A. {master}user@R1-re0> show system snapshotInformation for snapshot on hard-diskCreation datE. Nov 1 1 :5 :0 2012JUNOS version on snapshot:jbase : 11.4R2jcrypto: 11.4R2jdocs : 11.4R2jkernel: 11.4R2jpfe : M40-11.4R2jroute : 11.4R2
B. {backup}user@R1-re1> show system switchoverGraceful switchover: OnConfiguration databasE. Readykernel databasE. ReadyPeer StatE. steady State
C. {backup}user@R1-re1> show system snapshotInformation for snapshot on hard-diskCreation datE. Nov 1 1 :5 :0 2012JUNOS version on snapshot:jbase : 11.4R2jcrypto: 11.4R2jdocs : 11.4R2jkernel: 11.4R2jpfe : M40-11.4R2jroute : 11.4R2
D. {master}user@R1-re0> show system switchoverGraceful switchover: OnConfiguration databasE. Readykernel databasE. ReadyPeer StatE. steady State

Answer: B

Question: 21

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

A. Type 7
B. Type 5
C. Type 4
D. Type 3

Answer: C

Question: 22

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

A. The BDR advertises link-state information with all other OSPF routers on the segment.
B. The BDR forms an adjacency with all other OSPF routers on the segment.
C. The BDR is ready to assume the role of the DR device if it fails.
D. The BDR functions can be distributed to the DR device on the segment.

Answer: B,C

Question: 23

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

A. Down
B. Init
C. 2-way
D. ExStart

Answer: B

Question: 24

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

A. The MTU is mismatched.
B. The subnet mask is mismatched.
C. The interface type is point-to-point.
D. The interface type is broadcast.

Answer: C

Question: 25

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

A. backbone area
B. not-so-stubby area
C. stub area
D. totally stubby area

Answer: A,B

Question: 26

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

A. Type 2 and Type 3
B. Type 3 and Type 4
C. Type 5 and Type 6
D. Type 6 and Type 7

Answer: B

Question: 27

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

A. the router with the highest priority
B. the router with the lowest priority
C. the router with the highest RID
D. the router with the lowest RID

Answer: A,C

Question: 28

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

A. These routes are OSPF interarea routes.
B. These routes have been redistributed into OSPF and are using a Type 2 metric.
C. These routes are preferred over the same routes with an EXT1 metric.
D. These routes are OSPF intra-area routes.

Answer: B

Question: 29

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

A. show ospf database | match log
B. show spf log
C. show ospf log
D. show ospf statistics

Answer: C

Question: 30

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

A. Look for a mismatched IP subnet or mask.
B. Determine whether the neighbor is a DR-Other.
C. Determine whether the hello and dead intervals are the same on both sides.
D. Review the MTU settings to ensure that they match.

Answer: D

Question: 31

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

A. Create a redistribution policy and apply it as an export policy under the [edit protocols ospf area] hierarchy.
B. Create a redistribution policy and apply it as an import policy in the [edit protocols ospf] hierarchy.
C. Create a redistribution policy and apply it as an import or an export policy in the [edit protocols ospf] hierarchy.
D. Create a redistribution policy and apply it as an export policy in the [edit protocols ospf] hierarchy.

Answer: D

Question: 32

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

A. If the loopback is configured with a 127/8 address, it will be used.
B. If the loopback is not configured, it will use the interface with the highest IP address.
C. If the loopback is configured and does not have a usable address, the IP address associated with the first hardware interface is used.
D. If you configure a dedicated management address and include that interface in OSPF, it will be used as the router ID.

Answer: C

Question: 33

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

A. Level 1 adjacencies can form in the same (intra) area only.
B. Level 2 adjacencies are formed between (inter) areas only.
C. Level 2 adjacencies can be established either interarea or intra-area.
D. Level 2 adjacencies can form within the same (intra) area only.

Answer: A,C

Question: 34

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

A. the complete sequence number PDU
B. the partial sequence number PDU
C. a hello PDU with a request PDU TLV specifying the missing LSP
D. a hello PDU with a refresh PDU TLV requesting all LSPs

Answer: B

Question: 35

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

A. The DIS function is used only on broadcast or multi-access networks.
B. The DIS function is used on both broadcast and point-to-point link types.
C. On a broadcast network, adjacencies are formed only between the non-DIS nodes and the DIS to help reduce adjacency overhead.
D. IS-IS supports a backup DIS mechanism to provide rapid failover in the event of a DIS failure.

Answer: A

Question: 36

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.)

A. A lack of or a malformed ISO network entity title (NET) on the loopback interface would cause this issue.
B. The interface MTU might be less than 1492.
C. The IS-IS protocol on the loopback interface has not been enabled.
D. The area IDs might be matched and should be set differently.
E. An ISO NET might not be configured on the physical interface.

Answer: A,B,C

Question: 37

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

A. An L1 router has a single database reflecting the connectivity of its area.
B. An L1 router often relies on a default route generated by attached routers to reach interarea destinations.
C. The Level 2 database contains only backbone area routes unless route leaking is configured.
D. Route leaking can be used to optimize Level 2 to Level 1 routing.
E. An attached router has at least two LSDBs: one for each Level 1 area and a single LSDB for the Level 2 backbone.

Answer: A,B,E

Question: 38

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

A. hello
B. link state
C. complete sequence number
D. partial sequence number

Answer: D

Question: 39

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

A. Both use hello packets to form and maintain adjacencies.
B. Both use the Dijkstra algorithm to construct a shortest-path tree.
C. Both elect a designated router and a backup designated router.
D. Both have a built-in mechanism to provide address summarization between areas.

Answer: A,B

Question: 40

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

A. IBGP is used within an AS, whereas EBGP is used between two different ASs.
B. EBGP peering is normally loopback-based to provide tolerance for interface or link failures.
C. By default, EBGP updates the next-hop attribute, whereas IBGP does not.
D. IBGP speakers can re-advertise IBGP-learned or EBGP-learned routes to other IBGP speakers.
E. EBGP speakers can re-advertise IBGP-learned or EBGP-learned routes to other EBGP speakers.

Answer: A,C,E