Practice Free JN0-664 Exam Online Questions
Question #11
Refer to the exhibit.
Click the Exhibit button.
Which two statements are correct about the class-of-service configuration shown in the exhibit? (Choose two.)
- A . Incoming traffic will not be classified because no classifier exists in the configuration.
- B . The best-effort queue can transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, if no other queue is using that bandwidth.
- C . Incoming traffic will be classified using the default classifier.
- D . The best-effort queue can never transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, even if that bandwidth is available.
Correct Answer: BC
BC
Explanation:
The class-of-service (CoS) configuration in the exhibit shows how traffic is scheduled on the ge-0/0/0 interface.
Let’s analyze each statement to determine its correctness:
BC
Explanation:
The class-of-service (CoS) configuration in the exhibit shows how traffic is scheduled on the ge-0/0/0 interface.
Let’s analyze each statement to determine its correctness:
Question #12
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
Correct Answer: B,C
B,C
Explanation:
In Junos devices, when a packet is received on an interface configured with transmission scheduling, and one of the configured queues is exceeding its allocated bandwidth, the typical actions taken are based on the scheduling configuration and congestion management mechanisms in place. Here are the two likely default actions:
The excess traffic will be discarded. When a queue exceeds its configured bandwidth, and if there are no other congestion management mechanisms in place (like buffer or RED profiles), the excess traffic could be dropped by default.
The excess traffic will use bandwidth available from other queues. If excess bandwidth is available from other queues and the scheduling configuration allows for it, excess traffic may utilize unused bandwidth from other queues. This is typical behavior in scenarios where queues are configured with some form of shared bandwidth allocation or where one queue can borrow unused bandwidth from others.
B,C
Explanation:
In Junos devices, when a packet is received on an interface configured with transmission scheduling, and one of the configured queues is exceeding its allocated bandwidth, the typical actions taken are based on the scheduling configuration and congestion management mechanisms in place. Here are the two likely default actions:
The excess traffic will be discarded. When a queue exceeds its configured bandwidth, and if there are no other congestion management mechanisms in place (like buffer or RED profiles), the excess traffic could be dropped by default.
The excess traffic will use bandwidth available from other queues. If excess bandwidth is available from other queues and the scheduling configuration allows for it, excess traffic may utilize unused bandwidth from other queues. This is typical behavior in scenarios where queues are configured with some form of shared bandwidth allocation or where one queue can borrow unused bandwidth from others.
Question #12
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
Correct Answer: B,C
B,C
Explanation:
In Junos devices, when a packet is received on an interface configured with transmission scheduling, and one of the configured queues is exceeding its allocated bandwidth, the typical actions taken are based on the scheduling configuration and congestion management mechanisms in place. Here are the two likely default actions:
The excess traffic will be discarded. When a queue exceeds its configured bandwidth, and if there are no other congestion management mechanisms in place (like buffer or RED profiles), the excess traffic could be dropped by default.
The excess traffic will use bandwidth available from other queues. If excess bandwidth is available from other queues and the scheduling configuration allows for it, excess traffic may utilize unused bandwidth from other queues. This is typical behavior in scenarios where queues are configured with some form of shared bandwidth allocation or where one queue can borrow unused bandwidth from others.
B,C
Explanation:
In Junos devices, when a packet is received on an interface configured with transmission scheduling, and one of the configured queues is exceeding its allocated bandwidth, the typical actions taken are based on the scheduling configuration and congestion management mechanisms in place. Here are the two likely default actions:
The excess traffic will be discarded. When a queue exceeds its configured bandwidth, and if there are no other congestion management mechanisms in place (like buffer or RED profiles), the excess traffic could be dropped by default.
The excess traffic will use bandwidth available from other queues. If excess bandwidth is available from other queues and the scheduling configuration allows for it, excess traffic may utilize unused bandwidth from other queues. This is typical behavior in scenarios where queues are configured with some form of shared bandwidth allocation or where one queue can borrow unused bandwidth from others.
Question #14
Which two statements are correct about IS-IS interfaces? (Choose two.)
- A . If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels.
- B . If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level.
- C . If a point-to-point interface is in both L1 and L2, one combined hello message is sent for both levels.
- D . If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level
Correct Answer: CD
CD
Explanation:
IS-IS supports two levels of routing: Level 1 (intra-area) and Level 2 (interarea). An IS-IS router can be either Level 1 only, Level 2 only, or both Level 1 and Level 2. A router that is both Level 1 and Level 2 is called a Level 1-2 router. A Level 1-2 router sends separate hello messages for each level on both point-to-point and broadcast interfaces1. A point-to-point interface provides a connection between a single source and a single destination. A broadcast interface behaves as if the router is connected to a LAN.
CD
Explanation:
IS-IS supports two levels of routing: Level 1 (intra-area) and Level 2 (interarea). An IS-IS router can be either Level 1 only, Level 2 only, or both Level 1 and Level 2. A router that is both Level 1 and Level 2 is called a Level 1-2 router. A Level 1-2 router sends separate hello messages for each level on both point-to-point and broadcast interfaces1. A point-to-point interface provides a connection between a single source and a single destination. A broadcast interface behaves as if the router is connected to a LAN.
Question #15
Which two statements about IS-IS are correct? (Choose two.)
- A . PSNPs are flooded periodically.
- B . PSNPs contain only descriptions of LSPs.
- C . CSNPs are flooded periodically
- D . CSNPs contain only descriptions of LSPs.
Correct Answer: C,D
C,D
Explanation:
In IS-IS (Intermediate System to Intermediate System), which is a routing protocol designed to move information efficiently to the appropriate routers:
CSNPs are flooded periodically.
Complete Sequence Number PDUs (CSNPs) contain a list of all LSPs (Link State PDUs) that the sending router has in its database and are sent periodically to ensure database synchronization among routers in the same IS-IS area.
CSNPs contain only descriptions of LSPs.
CSNPs indeed contain summaries of the LSPs that a router has, allowing other routers to check if they have all the LSPs in the sequence or if they need to request any missing ones.
Partial Sequence Number PDUs (PSNPs) are not flooded periodically; rather, they are sent in response to CSNPs or to acknowledge the receipt of LSPs. PSNPs also contain descriptions of LSPs, but they are used for acknowledging and requesting specific LSPs, not for periodic flooding.
C,D
Explanation:
In IS-IS (Intermediate System to Intermediate System), which is a routing protocol designed to move information efficiently to the appropriate routers:
CSNPs are flooded periodically.
Complete Sequence Number PDUs (CSNPs) contain a list of all LSPs (Link State PDUs) that the sending router has in its database and are sent periodically to ensure database synchronization among routers in the same IS-IS area.
CSNPs contain only descriptions of LSPs.
CSNPs indeed contain summaries of the LSPs that a router has, allowing other routers to check if they have all the LSPs in the sequence or if they need to request any missing ones.
Partial Sequence Number PDUs (PSNPs) are not flooded periodically; rather, they are sent in response to CSNPs or to acknowledge the receipt of LSPs. PSNPs also contain descriptions of LSPs, but they are used for acknowledging and requesting specific LSPs, not for periodic flooding.
Question #15
Which two statements about IS-IS are correct? (Choose two.)
- A . PSNPs are flooded periodically.
- B . PSNPs contain only descriptions of LSPs.
- C . CSNPs are flooded periodically
- D . CSNPs contain only descriptions of LSPs.
Correct Answer: C,D
C,D
Explanation:
In IS-IS (Intermediate System to Intermediate System), which is a routing protocol designed to move information efficiently to the appropriate routers:
CSNPs are flooded periodically.
Complete Sequence Number PDUs (CSNPs) contain a list of all LSPs (Link State PDUs) that the sending router has in its database and are sent periodically to ensure database synchronization among routers in the same IS-IS area.
CSNPs contain only descriptions of LSPs.
CSNPs indeed contain summaries of the LSPs that a router has, allowing other routers to check if they have all the LSPs in the sequence or if they need to request any missing ones.
Partial Sequence Number PDUs (PSNPs) are not flooded periodically; rather, they are sent in response to CSNPs or to acknowledge the receipt of LSPs. PSNPs also contain descriptions of LSPs, but they are used for acknowledging and requesting specific LSPs, not for periodic flooding.
C,D
Explanation:
In IS-IS (Intermediate System to Intermediate System), which is a routing protocol designed to move information efficiently to the appropriate routers:
CSNPs are flooded periodically.
Complete Sequence Number PDUs (CSNPs) contain a list of all LSPs (Link State PDUs) that the sending router has in its database and are sent periodically to ensure database synchronization among routers in the same IS-IS area.
CSNPs contain only descriptions of LSPs.
CSNPs indeed contain summaries of the LSPs that a router has, allowing other routers to check if they have all the LSPs in the sequence or if they need to request any missing ones.
Partial Sequence Number PDUs (PSNPs) are not flooded periodically; rather, they are sent in response to CSNPs or to acknowledge the receipt of LSPs. PSNPs also contain descriptions of LSPs, but they are used for acknowledging and requesting specific LSPs, not for periodic flooding.
Question #17
You are configuring anycast RP for load balancing and redundancy in your PIM-SM domain. You want to share active sources between RPs.
In this scenario, what are two solutions that will accomplish this task? (Choose two.)
- A . Configure MSDP on each RP router.
- B . Configure anycast PIM with the rp-set statement on each RP router.
- C . Configure anycast PIM with the rp-set statement on each source DR router.
- D . Configure MSDP on each source DR router.
Correct Answer: A, B
Question #17
You are configuring anycast RP for load balancing and redundancy in your PIM-SM domain. You want to share active sources between RPs.
In this scenario, what are two solutions that will accomplish this task? (Choose two.)
- A . Configure MSDP on each RP router.
- B . Configure anycast PIM with the rp-set statement on each RP router.
- C . Configure anycast PIM with the rp-set statement on each source DR router.
- D . Configure MSDP on each source DR router.
Correct Answer: A, B
Question #17
You are configuring anycast RP for load balancing and redundancy in your PIM-SM domain. You want to share active sources between RPs.
In this scenario, what are two solutions that will accomplish this task? (Choose two.)
- A . Configure MSDP on each RP router.
- B . Configure anycast PIM with the rp-set statement on each RP router.
- C . Configure anycast PIM with the rp-set statement on each source DR router.
- D . Configure MSDP on each source DR router.
Correct Answer: A, B
Question #20
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.
Correct Answer: A,B
A,B
Explanation:
Route reflection is a BGP feature that allows a router to reflect routes learned from one IBGP peer to another IBGP peer, without requiring a full-mesh IBGP topology. Route reflectors do not change any existing BGP attributes by default when advertising routes, unless explicitly configured to do so. A BGP peer does not require any configuration changes to become a route reflector client, only the route reflector needs to be configured with the client parameter under [edit protocols bgp group group-name neighbor neighbor-address] hierarchy level.
A,B
Explanation:
Route reflection is a BGP feature that allows a router to reflect routes learned from one IBGP peer to another IBGP peer, without requiring a full-mesh IBGP topology. Route reflectors do not change any existing BGP attributes by default when advertising routes, unless explicitly configured to do so. A BGP peer does not require any configuration changes to become a route reflector client, only the route reflector needs to be configured with the client parameter under [edit protocols bgp group group-name neighbor neighbor-address] hierarchy level.