Juniper JN0-664 Service Provider Professional (JNCIP-SP) Online Training

Question #1

Which two statements are correct about reflecting inet-vpn unicast prefixes in BGP route reflection? (Choose two.)

A . Route reflectors do not change any existing BGP attributes by default when advertising routes.
B . A BGP peer does not require any configuration changes to become a route reflector client.
C . Clients add their originator ID when advertising routes to their route reflector
D . Route reflectors add their cluster ID to the AS path when readvertising client routes.

Question #2

Exhibit

Click the Exhibit button-Referring to the exhibit, which two statements are correct about BGP routes on R3 that are learned from the ISP-A neighbor? (Choose two.)

A . By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3.
B . The BGP local-preference value that is used by ISP-A is not advertised to R3.
C . All BGP attribute values must be removed before receiving the routes.
D . The next-hop value for these routes is changed by ISP-A before being sent to R3.

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Correct Answer: A,B
A,B

Explanation:

BGP is an exterior gateway protocol that uses path vector routing to exchange routing information among autonomous systems. BGP uses various attributes to select the best path to each destination and to propagate routing policies. Some of the common BGP attributes are AS path, next hop, local preference, MED, origin, weight, and community. BGP attributes can be classified into four categories: well-known mandatory, well-known discretionary, optional transitive, and optional nontransitive. Well-known mandatory attributes are attributes that must be present in every BGP update message and must be recognized by every BGP speaker. Well-known discretionary attributes are attributes that may or may not be present in a BGP update message but must be recognized by every BGP speaker. Optional transitive attributes are attributes that may or may not be present in a BGP update message and may or may not be recognized by a BGP speaker. If an optional transitive attribute is not recognized by a BGP speaker, it is passed along to the next BGP speaker. Optional nontransitive attributes are attributes that may or may not be present in a BGP update message and may or may not be recognized by a BGP speaker. If an optional nontransitive attribute is not recognized by a BGP speaker, it is not passed along to the next BGP speaker. In this question, we have four routers (R1, R2, R3, and R4) that are connected in a full mesh topology and running IBGP. R3 receives the 192.168.0.0/16 route from its EBGP neighbor and advertises it to R1 and R4 with different BGP attribute values. We are asked which statements are correct about the BGP routes on R3 that are learned from the ISP-A neighbor.

Based on the information given, we can infer that the correct statements are:

✑ By default, the next-hop value for these routes is not changed by ISP-A before being sent to R3. This is because the default behavior of EBGP is to preserve the next-hop attribute of the routes received from another EBGP neighbor. The next-hop attribute indicates the IP address of the router that should be used as the next hop to reach the destination network.

✑ The BGP local-preference value that is used by ISP-A is not advertised to R3. This is because the local-preference attribute is a well-known discretionary attribute that is used to influence the outbound traffic from an autonomous system. The local-preference attribute is only propagated within an autonomous system and is not advertised to external neighbors.

References:

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html:

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html:

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13759-37.html

Question #3

A packet is received on an interface configured with transmission scheduling. One of the configured queues.

In this scenario, which two actions will be taken by default on a Junos device? (Choose two.)

A . The excess traffic will be discarded
B . The exceeding queue will be considered to have negative bandwidth credit.
C . The excess traffic will use bandwidth available from other queueses
D . The exceeding queue will be considered to have positive bandwidth credit

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Question #4

Which two statements are correct about VPLS tunnels? (Choose two.)

A . LDP-signaled VPLS tunnels only support control bit 0.
B . LDP-signaled VPLS tunnels use auto-discovery to provision sites
C . BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
D . BGP-signaled VPLS tunnels require manual provisioning of sites.

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Question #5

Exhibit

The network shown in the exhibit is based on IS-IS

Which statement is correct in this scenario?

A . The NSEL byte for Area 0001 is 00.
B . The area address is two bytes.
C . The routers are using unnumbered interfaces
D . The system IDofR1_2 is 192.168.16.1

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Question #6

Exhibit

Referring to the exhibit, CE-1 is providing NAT services for the hosts at Site 1 and you must provide Internet access for those hosts

Which two statements are correct in this scenario? (Choose two.)

A . You must configure a static route in the main routing instance for the 10 1 2.0/24 prefix that uses the VPN-A.inet.0 table as the next hop
B . You must configure a static route in the main routing instance for the 203.0.113.1/32 prefix that uses the VPN-A.inet.0 table as the next hop.
C . You must configure a RIB group on PE-1 to leak a default route from the inet.0 table to the VPN-A.inet.0 table.
D . You must configure a RIB group on PE-1 to leak the 10 1 2.0/24 prefix from the VPN-A.inet.0 table to the inet.0 table.

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Question #7

Which three mechanisms are used by Junos platforms to evaluate incoming traffic for CoS purposes? (Choose three )

A . rewrite rules
B . behavior aggregate classifiers
C . traffic shapers
D . fixed classifiers
E . multifield classifiers

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Question #8

Exhibit

You are asked to exchange routes between R1 and R4 as shown in the exhibit. These two routers use the same AS number.

Which two steps will accomplish this task? (Choose two.)

A . Configure the BGP group with the advertise-peer-as parameter on R1 and R4.
B . Configure the BGP group with the as-override parameter on R2 and R3
C . Configure the BGP group with the advertise-peer-as parameter on R2 and R3.
D . Configure the BGP group with the as-override parameter on R1 and R4

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Question #9

You want to ensure that L1 IS-IS routers have only the most specific routes available from L2 IS-IS routers.

Which action accomplishes this task?

A . Configure the ignore-attached-bit parameter on all L2 routers.
B . Configure all routers to allow wide metrics.
C . Configure all routers to be L1.
D . Configure the ignore-attached-bit parameter on all L1 routers

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Question #10

Exhibit

CE-1 must advertise ten subnets to PE-1 using BGP Once CE-1 starts advertising the subnets to PE-1, the BGP peering state changes to Active.

Referring to the CLI output shown in the exhibit, which statement is correct?

A . CE-1 is advertising its entire routing table.
B . CE-1 is configured with an incorrect peer AS
C . The prefix limit has been reached on PE-1
D . CE-1 is unreachable

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Juniper JN0-664 Service Provider Professional (JNCIP-SP) Online Training