Juniper Networks Certified Internet Specialist JN0-303 Test
JN0-303
QUESTION 1Into which protocol are LDP hello messages encapsulated?
A. IPB. TCPC. UDPD. MPLS
Answer: CLDP Hello messages are sent on UDP port 646
QUESTION 2Given the following LSP configuration, which statement is true?label-switched-pathlsp-xyz {to 10.2000.1.1;primarypath1;secondarypath2;secondarypath3;no-cspf;}pathpath1 {10.200.10.1 strict;}pathpath2 {10.200.20.1 strict;}pathpath3 {10.200.30.1loose}
A. The router will use path1 when it is available and stable.B. The router will use path3 when it is available and stable.C. The router will attempt to establish path2 only when path1 and path3 are down.D. The router will attempt to establish path1 only when path2 and path3 are down.
Answer: AAn LSP can have zero or one primary path applied. When it is configured the primarypath must be used if it's available in the network.
QUESTION 3What is the optimize timer on an RSVP-signaled Label-Switched Path (LSP)?
A. the time it takes to identify the optimal path for the LSPB. the interval at which the ingress router recalculates the LSP's pathC. the time the ingress router takes to establish the primary path JN0-303
D. the maximum number of times the ingress router tries to establish the primary path
Answer: BOnce an LSP has been established, topology or resources changes might, over time, makethe path suboptimal. You can configure the ingress router to recompute paths periodicallyto determine whether a more optimal path has become available. The frequency of thiscalculation is set by the optimize timer command in JUNOS.
QUESTION 4What are three RSVP messages? (Choose three.)
A. PathErr: Path errorB. ResvErr: Reservation errorC. PathConf: Path confirmationD. ResvConf: Reservation confirmation
Answer: A, B, DThe PathErr message travels upstream to the ingress router and denotes an error along theestablished path. The ResvErr travels downstream to the egress router and denotes anerror along the established path. The ResvConf message is a message sent to the egressrouter upon request confirming the Resv message was received.
QUESTION 5Which is a step in the JUNOS software CSPF algorithm?
A. Prune links that are bidirectional.B. Eliminate paths with insufficient MTU.C. Eliminate paths of more than 15 hops.D. Prune links that do not contain the included administrative group.
Answer: DOne aspect of traffic engineering in the ability to control what types of traffic use certainnetwork links. One method for reaching this administrative goal is the use ofadministrative groups. When an LSP requires a network path that includes linksbelonging to an administrative group, the CSPF algorithm removes all links that don'tcontain the requested group value.
QUESTION 6What is required to enable the use of metrics larger than 63 for traffic engineeringin IS-IS?
A. Nothing, wide metrics are used by default in IS-IS.B. Enable wide-metrics-only under protocol IS-IS.C. Enable traffic-engineering under protocols IS-IS.D. Disable TVL's 2 and 128 which carry the 6-bit metrics (0-63). JN0-303
Answer: BTo properly advertise a metric value greater than 63, a router must enable theadvertisement of "wide metrics" using the wide-metrics-only command within theappropriate IS-IS level. This command informs the local router to only send the widemetric TLVs (types 22 and 135).
QUESTION 7In JUNOS software, which command is used to configure TED support for OSPF?
A. set protocols rsvp cspf-enableB. set protocols mpls cspf-enableC. set protocols rsvp traffic-engineeringD. set protocols ospf traffic-engineering
Answer: DThe OSPF protocol makes use of a type 10 Opaque LSA for advertising trafficengineering information in a network. Traffic engineering is enable with the commandset traffic-engineering within the protocols/ospf configuration hierarchy.
QUESTION 8An OSPF non-backbone area follows external routes to be flooded within the area.These external routes are propagated into other areas. However, external routesfrom other areas are not allowed to enter this area.Which type of OSPF area does this describe?
A. stub areaB. transit areaC. border areaD. not-so-stubby area
Answer: DAn OSPF not-so-stubby-area is created when an otherwise stub area has a need toconnect to an external network through an ASBR. An NSSA allows for the injection ofexternal routing knowledge by an ASBR using an NSSA external LSA, type code 7.
QUESTION 9In JUNOS software, what is required to dedistribute RIP routes into OSPF?
A. Apply an export policy in RIP.B. Apply an import policy in RIP.C. Apply an export policy in OSPF.D. Apply an import policy in OSPF.
Answer: CBy default, the OSPF protocol will have no knowledge of routes from other routingprotocols including RIP. On a Juniper router, routing policies are used to redistribute
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