Juniper Networks Certified Internet Specialist, – Service Provider (JNCIS-SP)

QUESTION NO: 1

What are two valid actions that can be applied to a frame by a Layer 2 firewall filter?

(Choose two)

  • Log

  • loss-priority

  • sample

  • count

Answer: B, D

The correct answers are B, D.

Reference:

You can specify the following filter actions:

* accept

* count counter-name

* discard

* dscp code-point (family inet only)

* forwarding-class class-name

* ipsec-sa ipsec-sa (family inet only)

* load-balance group-name (family inet only)

* log ( family inet and inet6 only )

* logical-system logical-system-name (family inet and inet6 only)

* loss-priority (high | medium-high | medium-low | low)

* next term

* next-hop-group group-name (family inet only)

* policer policer-name

* port-mirror (family bridge, ccc, inet, inet6, and vpls only)

* prefix-action action-name (family inet only)

* reject <message-type> (family inet and inet6 only)

* routing-instance routing-instance-name (family inet and inet6

only)

* sample ( family inet, inet6, and mpls only )

* service-accounting (service filters and family inet or inet6

only)

* service-filter-hit (service filters and family inet or inet6

only)

* syslog (family inet and inet6 only)

* three-color-policer policer-name

* topology topology-name (family inet and inet6 only)

* traffic-class code-point (family inet6) only

QUESTION NO: 2

Which two statements describe differences between IPv4 and IPv6? (Choose two)

  • IPsec is built into IPv6

  • IPv6 uses a 32-bit (4-byte) address and can support up to 4,294,967,296 addresses

  • IPv4 supports extension headers whereas IPv6 options are integrated into the base

  • IPv6 eliminates the need for NAT

Answer: A, D

QUESTION NO: 3

You must configure an OSPF area that does not accept type 3 link-state advertisements (LSAs) from area 0 (other than the default route) You have configured your area to be stub, but you still see type 3 LSAs.

What will account for this behavior?

  • You should have configured your area as totally stubby

  • You should have used a not-so-stubby-area

  • You are experiencing a routing loop

  • You have exported routes into OSPF

Answer: A

QUESTION NO: 4

You have configured an IP-IP tunnel between Router A and Router B

Which Junos operational mode command is used to verify that the tunnel interface is up and operational?

  • show chassis tunnel status

  • show tunnel interface

  • show interfaces terse

  • show interfaces tunnel

Answer: C

QUESTION NO: 5

Which IS-IS packet is used to determine the level of an IS-IS neighbor?

  • IIH

  • LSP

  • PSNP

  • CSNP

Answer: A

QUESTION NO: 6

Router A is an OSPF router connected to both Area 0 and Area 1 Area 1 has been configured as a stub area Which two LSA types does Router A suppress from Area 1 ?

  • Router LSA

  • External LSA

  • Summary LSA

  • ASBR Summary LSA

Answer: B, D

QUESTION NO: 7

You are logged into a router and have navigated to the (edit routing-options] level of the hierarchy. You have been asked to create a static route that will use 10.10.10.1 as its primary next-hop and 10.10.10.5 as its secondary next-hop.

Which command correctly configures this scenario?

  • set static route 8/8 10.10.10.1 qualified-next-hop 10.10.10.5 pref 10

  • set static route 8/8 next-hop 10.10.10.1 secondary-next-hop 10.10.10.5 preference 10

  • set static route 8/8 next-hop 10.10.10.1 qualified-next-hop 10.10.10.5 preference 10

  • set static route 8/8 next-hop [10.10.10.1 10.10.10.5] pref 10

Answer: C

QUESTION NO: 8

Which Junos operational mode command is used to verify that load balancing is working as expected?

  • show route all

  • show route extensive

  • show route balancing

  • show route forwarding-table

Answer: D

QUESTION NO: 9

Click the Exhibit button

Based on the illustration of the VPLS topology shown in the exhibit, which statement is true?

  • PE-C must have a spanning-tree protocol enabled

  • CE-C must have BGP enabled

  • Traffic forwarded from PE-C to PE-A is forwarded on to PE-B

  • Traffic forwarded from PE-C to PE-A is not forwarded on to PE-B

Answer: D

QUESTION NO: 10

Which two values displayed in the output from the show spanning-tree MSTP configuration command must match on all switches participating in the same MSTP region? (Choose two)

  • root bridge identifier

  • authentication checksum

  • context identifier

  • configuration digest

Answer: C, D

QUESTION NO: 11

Which role does the router ID (RID) have in the BGP route selection process?

  • The router ID is evaluated immediately after MED to determine route preference

  • The router ID is evaluated last in the route selection process

  • The router ID is evaluated after the cluster length and a lower router ID is chosen

  • The router ID is evaluated after analyzing the IGP metric cost

Answer: C

Reference:

http://www.juniper.net/techpubs/en_US/junos10.0/information-products/topic-collections/nog-baseline/bgp-routes-and-selection-introduction.html

QUESTION NO: 12

You are logged into a router and have navigated to the [edit routing-options] level of the hierarchy. You have been asked to create a static route that will use 43 18 7 1 as its primary next-hop and 76 1310 2 as its secondary next-hop.

Which command correctly configures this setup?

  • set static route 0/0 76.13.10.2 qualified-next-hop 43.18.7.1 pref 10

  • set static route 0/0 next-hop 43.18.7.1 secondary-next-hop 76.13.10.2 preference 10

  • set static route 0/0 next-hop [76.13.10.2 10.10.10.5] pref 10

  • set static route 0/0 next-hop 43.18.7.1 qualified-next-hop 76.13.10.2 preference 10

Answer: D

QUESTION NO: 13

Click the Exhibit button

Referring to the network illustrated in the exhibit, how does router A reach destinations in area 49.2222?

  • Router A will use the routes from area 49.2222; it learns from router B

  • Router A will see the attached bit from router B and create a default route

  • Router A must have a default route manually configured

  • Router A will receive a default route in the IS-IS update from router B

Answer: B

QUESTION NO: 14

You have recently implemented a graceful Routing-Engine switchover (GRES) and want to further reduce down time if a Routing Engine (RE) failure occurs.

Which two features can be configured on this device to reduce its downtime in this situation? (Choose two)

  • VRRP

  • GR

  • BFD

  • NSR

Answer: B, D

QUESTION NO: 15

Which BGP state denotes a fully operational session?

  • Established

  • Active

  • Operational

  • Connect

Answer: A

QUESTION NO: 16

Click the Exhibit button

You work for the regional Internet service provider shown in the exhibit You have a partial BGP table and are receiving a 10 100/16 route from your upstream ISP You have been asked to configure a default route that can be sent to your downstream customer This route should forward customer traffic toward your upstream Tier 11SP as long as the 10.100/16 route is present.

What would accomplish this goal?

  • Create and announce an aggregate default route

  • Create and announce a static default route with a next-hop of discard

  • Create and announce a static default route with a next-hop of reject

  • Create and announce a generated default route

  • Create an advertise-map with exist-map

Answer: E

Reference:

http://www.juniper.fr/techpubs/en_US/junose10.0/information-products/topic-collections/swconfig-bgp-mpls/advertising-a-default-route-only-when-another-route-is-present.html

QUESTION NO: 17

Click the Exhibit button

In the exhibit, OSPF routers R1, R2, R3, and R4 come up, in order, at 1-minute intervals

Which router will be the designated router?.

  • R1

  • R2

  • R3

  • R4

Answer: A

QUESTION NO: 18

You have been asked to configure an IPv6 address for a group of interfaces that could belong on different routers. If a packet is sent to that address, it should be received by all routers in the group.

Which address type would be suited for these requirements?

  • Unicast

  • Multicast

  • Anycast

  • Broadcast

Answer: B

QUESTION NO: 19

What is the function of the hop limit field in the IPv6 header?

  • It limits the diameter of the network to 20 hops

  • It sets the number of hops in the network to be equal to the MPLS header time-to-live (TTL)

  • It replaces the time-to-live (TTL) field in IPv4

  • It represents future extensibility to the protocol

Answer: C

QUESTION NO: 20

You have been asked to define a default gateway for traffic leaving a router. This route should use interface so-0/0/0 as its next-hop.Which type of route would be suited for this scenario?

A. a static route

B. a generated route

C. a martian route

D. an aggregate route

Answer: A

QUESTION NO: 21

Click the Exhibit button

In the exhibit, how many full OSPF adjacencies will R3 have?

  • 0

  • 1

  • 2

  • 3

Answer: C

QUESTION NO: 22

You are asked to design a Layer 2 switched topology that can automatically recover from link failures.

Which type of protocol would you consider in your design?

  • GSTP

  • LLDP

  • LFM

  • MSTP

Answer: D

QUESTION NO: 23

Click the Exhibit button

When the Junos configuration shown in the exhibit is applied to the router, which routes in the forwarding table will begin load-balancing packet flows?

  • all routes in the forwarding table

  • all OSPF routes in the forwarding table

  • all BGP routes in the forwarding table

  • all RFC1918 routes in the forwarding table

Answer: D

QUESTION NO: 24

You have configured MPLS and RSVP in your network using all of the Junos defaults. You established an LSP in your network which is reporting an up status but no traffic is using it.

Which two statements reflect potential causes for this issue? (Choose two)

  • The LSP egress address is a physical interface address

  • family MPLS was omitted from the router configurations

  • No BGP routes are being advertised from the remote neighbor

  • The LSP egress address does not match the BGP next-hop address

Answer: C, D

QUESTION NO: 25

Using industry best practices, what is true regarding an external BGP session?

  • BGP neighbors belong to the same AS

  • BGP neighbors belong to a different AS

  • BGP sessions rely on a static route for reach ability

  • BGP sessions will be established between loopback interface addresses.

Answer: B

QUESTION NO: 26

You own a home network connecting through an always-on connection and need to assign IPv6 addresses to your routers because you want to follow the guidelines spelled out in RFC 3177. you want to design your network with the correct prefixes.

Which prefix would your ISP likely allocate to your network?

  • 47-bit prefix

  • 48-bit prefix

  • 64-bit prefix

  • 128-bit prefix

Answer: B

From RFC 3177: This document provides recommendations to the addressing registries (APNIC, ARIN and RIPE-NCC) on policies for assigning IPv6 address blocks to end sites. In particular, it recommends the assignment of /48 in the general case, /64 when it is known that one and only one subnet is needed and /128 when it is absolutely known that one and only one device is connecting.

QUESTION NO: 27

Which two BGP attributes are modified by default when they are passed between external BGP peers? (Choose two)

  • MED

  • AS-Path

  • Communities

  • Next Hop

Answer: B, D

QUESTION NO: 28

Click the Exhibit button

In an RSTP network, the root and designated ports have been elected as shown in the exhibit

What will be the port type of port 1?

  • backup port

  • discarding port

  • alternate port

  • listening port

Answer: C

Explanation:

The two ports of switch B are connected to a shared LAN. One of them will be alternate port and other will be backup port. The ports that have better port priority become the alternate and the other port becomes backup. If port's priorities are left at default values then the port that has lower number has better priority and becomes alternate. As the port in question has number “1” I assume that the other port can have number grater than 1. So the port 1 should have better priority and should become alternate port.

QUESTION NO: 29

Which two statements about BGP are accurate? (Choose two.)

  • BGP uses UDP port 500 for connectivity.

  • BGP uses TCP port 179 for connectivity.

  • External peering sessions require an underlying IGP.

  • Internal peering sessions require an underlying IGP.

Answer: B, D

QUESTION NO: 30

Which two elements contribute to the bridge ID when configuring RSTP? (Choose 2)

  • designated MAC address

  • bridge priority

  • extended system ID

  • root ID

  • bridge address

Answer: A, B

The bridge ID consists of a configurable bridge priority and the MAC address of the bridge.

Reference:

http://www.juniper.net/techpubs/software/junos/junos95/swconfig-layer-2/conf-stp.html#conf-bridge-priority

QUESTION NO: 31

You want to influence how traffic enters your network

Using industry best practices, which two BGP attributes would you modify to accomplish this goal? (Choose two)

  • AS Path

  • Local Preference

  • Next Hop

  • MED

Answer: A, D

QUESTION NO: 32

You have recently installed a second Routing Engine (RE) in your router

Which two statements correctly describe the expected behavior if the primary RE fails?

(Choose two.)

  • The backup RE will assume the master role once the packet forwarding engine restarts

  • The backup RE will immediately assume the master role

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

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

Answer: A, C.

The result depends on the configured features.

Reference: http://www.juniper.net/techpubs/en_US/junos9.5/information-products/topic-collections/swconfig-high-availability/high-availability-features-in-junos-introducing.html

QUESTION NO: 33

Which command would you use to verify the presence of VPN routes on a PE device?

  • show route table bgp.l3vpn.0

  • show route protocol bgp terse | count

  • show route table inet.0

  • show route route-type vpn

Answer: A

QUESTION NO: 34

Which statement is true of a Layer 2 circuit?

  • Layer 2 circuits use BGP for signaling

  • Layer 2 circuits use OSPF for signaling

  • Layer 2 circuits use LDP for signaling

  • Layer 2 circuits rely on RSVP for signaling

Answer: C

QUESTION NO: 35

Click the Exhibit button

An operator is unable to establish any IS-IS adjacencies on a router in the network.

Based on the configuration shown in the exhibit, what is the problem?

  • Interface loO must be configured in the IS-IS hierarchy

  • Each network interface needs a unique family ISO address

  • The IS-IS level for an each interface must be specified

  • The ISO address for interface loO is not in hex format

Answer: A

QUESTION NO: 36

What are three circumstances under which a router sends link-state PDUs (LSPs)?

(Choose three)

  • LSPs are sent periodically every 9 seconds

  • LSPs are sent when there is a network change

  • LSPs are sent during adjacency formation

  • LSPs are sent in response to CSNP messages

  • LSPs are sent in response to PSNP messages

Answer: B, C, E

QUESTION NO: 37

In an RSTP network, which combination of port types can exist on the root bridge?

  • There can be some combination of designated ports and backup ports

  • There can be some combination of root ports and alternate ports

  • All ports will be designated ports

  • All ports will be root ports

Answer: C

QUESTION NO: 38

Your company has purchased two new Juniper Networks MX480 routers. Your manager has asked you to add these two devices to the existing ISIS network.

Which two rules about ISIS adjacencies must you consider when carrying out the configuration? (Choose two)

  • For Level 1 adjacencies, area IDs must be the same

  • For Level 2 adjacencies area IDs must be the same

  • The IS-IS levels configured on the interfaces must be the same

  • The IS-IS levels on the interfaces can be different

Answer: A, C

QUESTION NO: 39

In the evaluation of an RSTP configuration BPDU.

Which two values are contained in the Bridge ID value? (Choose two)

  • root bridge address

  • priority

  • originating bridge address

  • port number

Answer: B, C

QUESTION NO: 40

Under which Junos configuration hierarchy is a load-balancing policy applied?

  • [edit routing-options family inet]

  • [edit forwarding-options family inet]

  • [edit routing-options forwarding-table]

  • [edit forwarding-options forwarding-table]

Answer: C

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