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Juniper JN0-650 Practice Test 8

Question 70

Voice queues crowd out background classes because their transmit rates are poorly planned. Select TWO statements that correctly combine the Scheduler transmit rate bandwidth allocation implementation, its evidence, or its governing principle.

  1. Increase VLAN ID to allocate more physical bandwidth to the class.
  2. Configure suitable scheduler transmit-rate reservations considering link capacity.
  3. Assign deliberate PLP values through classification or policing policy.
  4. Apply the intended scheduler map to the actual output interface.
  5. Congested classes meet intended minimum shares without exceeding physical bandwidth.

Explanation

Correct Answers

B:

Configure suitable scheduler transmit-rate reservations considering link capacity. This is the intended implementation action for Scheduler transmit rate bandwidth allocation.

E:

Congested classes meet intended minimum shares without exceeding physical bandwidth. This is direct observable evidence for Scheduler transmit rate bandwidth allocation.

Incorrect Answers

A:

Increase VLAN ID to allocate more physical bandwidth to the class. This would not be an appropriate Scheduler transmit rate bandwidth allocation decision. Setting guaranteed transmit rates above available capacity yields unrealistic SLA expectations.

C:

Assign deliberate PLP values through classification or policing policy. This belongs to Packet loss priority PLP marking, not the specified Scheduler transmit rate bandwidth allocation operation. Scheduler transmit rates allocate planned bandwidth service to queues.

D:

Apply the intended scheduler map to the actual output interface. This belongs to Scheduler maps attached to egress interface, not the specified Scheduler transmit rate bandwidth allocation operation. Scheduler transmit rates allocate planned bandwidth service to queues.

Question 71

A routed Ethernet cross-connect has only two OSPF neighbors but shows a DR and BDR. Which next investigation or correction is MOST appropriate?

  1. Change all interfaces to nonbroadcast without checking neighbor discovery requirements.
  2. Verify source route active state policy terms and destination inet6.0 routes.
  3. Verify per-interface network type and Hello processing at both endpoints.
  4. Compare export term counters originator LSDB and external destinations on a neighbor.

Explanation

Correct Answer

C:

Verify per-interface network type and Hello processing at both endpoints. This checks whether both ends form a Full adjacency without an unnecessary DR election.

Incorrect Answers

A:

Change all interfaces to nonbroadcast without checking neighbor discovery requirements. That bypass leaves the OSPF point-to-point network type issue unresolved. Mixed OSPF interface network types can produce confusing neighbor behavior.

B:

Verify source route active state policy terms and destination inet6.0 routes. That check applies chiefly to OSPFv3 routing policy for external IPv6, not the current OSPF point-to-point network type issue. Point-to-point OSPF interfaces do not use broadcast-network DR election.

D:

Compare export term counters originator LSDB and external destinations on a neighbor. That check applies chiefly to OSPF external export policy redistribution, not the current OSPF point-to-point network type issue. Point-to-point OSPF interfaces do not use broadcast-network DR election.

Question 72

A multicast source exists but group join state never reaches a configured rendezvous point. Which technical principle BEST explains the PIM sparse-mode RP shared tree decision?

  1. OSPF database exchange can stall when peers disagree on interface MTU.
  2. Sparse-mode ASM commonly uses an RP to establish initial shared-tree multicast state.
  3. Multicast involves host membership router tree state and actual forwarding traffic.
  4. Multicast forwarding depends on both RPF incoming checks and valid outgoing interface state.

Explanation

Correct Answer

B:

Sparse-mode ASM commonly uses an RP to establish initial shared-tree multicast state. In this situation, the relevant action is to configure reachable appropriate RP mapping for the required ASM group range.

Incorrect Answers

A:

OSPF database exchange can stall when peers disagree on interface MTU. That principle is related to OSPF interface MTU mismatch, not the main PIM sparse-mode RP shared tree choice. Absent or inconsistent RP mapping prevents initial ASM group discovery.

C:

Multicast involves host membership router tree state and actual forwarding traffic. That principle is related to Multicast troubleshooting separate control and data planes, not the main PIM sparse-mode RP shared tree choice. Absent or inconsistent RP mapping prevents initial ASM group discovery.

D:

Multicast forwarding depends on both RPF incoming checks and valid outgoing interface state. That principle is related to Multicast routing table incoming outgoing lists, not the main PIM sparse-mode RP shared tree choice. Absent or inconsistent RP mapping prevents initial ASM group discovery.

Question 73

A remote VXLAN tunnel endpoint cannot be reached even though local VLAN switching works. Which configuration or operational step BEST meets the stated requirement?

  1. Restore valid underlay routing to VTEP addresses and verify permitted VXLAN traffic.
  2. Add a VLAN description matching remote VTEP address and claim underlay routing is fixed.
  3. Configure supported single-active EVPN multihoming and failover selection.
  4. Apply supported ARP suppression using valid local or EVPN learned bindings.

Explanation

Correct Answer

A:

Restore valid underlay routing to VTEP addresses and verify permitted VXLAN traffic. VXLAN data plane depends on routable VTEP endpoints independent of EVPN MAC learning. The expected validation is that tunnel packets reach the remote VTEP and encapsulated frames traverse the overlay.

Incorrect Answers

B:

Add a VLAN description matching remote VTEP address and claim underlay routing is fixed. This is a risky or ineffective shortcut for VXLAN VTEP loopback underlay route. An EVPN Type2 route with unreachable tunnel next hop cannot deliver traffic.

C:

Configure supported single-active EVPN multihoming and failover selection. This addresses EVPN single-active multihoming access mode rather than the required VXLAN VTEP loopback underlay route decision. VXLAN data plane depends on routable VTEP endpoints independent of EVPN MAC learning.

D:

Apply supported ARP suppression using valid local or EVPN learned bindings. This addresses EVPN ARP suppression from IP MAC bindings rather than the required VXLAN VTEP loopback underlay route decision. VXLAN data plane depends on routable VTEP endpoints independent of EVPN MAC learning.

Question 74

A redistribution design unexpectedly sets an incomplete BGP origin and affects ranking. Which technical principle BEST explains the BGP origin attribute influence decision?

  1. VXLAN data plane depends on routable VTEP endpoints independent of EVPN MAC learning.
  2. BGP origin distinguishes IGP EGP and incomplete values with limited relative ranking.
  3. BGP address families determine which NLRI types may be exchanged.
  4. BGP route reflection reduces iBGP full-mesh needs using originator and cluster loop controls.

Explanation

Correct Answer

B:

BGP origin distinguishes IGP EGP and incomplete values with limited relative ranking. In this situation, the relevant action is to examine and apply origin attribute handling only within an intentional routing-policy decision.

Incorrect Answers

A:

VXLAN data plane depends on routable VTEP endpoints independent of EVPN MAC learning. That principle is related to VXLAN VTEP loopback underlay route, not the main BGP origin attribute influence choice. Treating origin as more important than LOCAL_PREF or AS_PATH yields incorrect predictions.

C:

BGP address families determine which NLRI types may be exchanged. That principle is related to BGP NLRI IPv4 unicast inet family, not the main BGP origin attribute influence choice. Treating origin as more important than LOCAL_PREF or AS_PATH yields incorrect predictions.

D:

BGP route reflection reduces iBGP full-mesh needs using originator and cluster loop controls. That principle is related to BGP route reflection cluster, not the main BGP origin attribute influence choice. Treating origin as more important than LOCAL_PREF or AS_PATH yields incorrect predictions.

Question 75

An engineer places an export policy on the wrong BGP direction and unexpected prefixes remain accepted. Which technical principle BEST explains the BGP import versus export policy direction decision?

  1. MAC RADIUS can authorize nonsupplicant devices but MAC identity is easier to spoof.
  2. BGP AS_PATH records AS traversal and participates in loop prevention and path selection.
  3. MP-BGP uses address-family negotiation and next-hop encodings for IPv6 NLRI.
  4. Import changes received-route eligibility while export governs what is sent to peers.

Explanation

Correct Answer

D:

Import changes received-route eligibility while export governs what is sent to peers. In this situation, the relevant action is to place route acceptance on BGP import and announcement selection on BGP export.

Incorrect Answers

A:

MAC RADIUS can authorize nonsupplicant devices but MAC identity is easier to spoof. That principle is related to MAC RADIUS printer onboarding, not the main BGP import versus export policy direction choice. Reversing policy direction may leak or wrongly accept routes.

B:

BGP AS_PATH records AS traversal and participates in loop prevention and path selection. That principle is related to BGP AS_PATH loop prevention and length, not the main BGP import versus export policy direction choice. Reversing policy direction may leak or wrongly accept routes.

C:

MP-BGP uses address-family negotiation and next-hop encodings for IPv6 NLRI. That principle is related to BGP NLRI IPv6 unicast inet6 family, not the main BGP import versus export policy direction choice. Reversing policy direction may leak or wrongly accept routes.

Question 76

A new authentication policy is installed yet active endpoint sessions retain old roles. Which technical principle BEST explains the RADIUS server-fail remediation and reauthentication decision?

  1. EAP credential validation requires mutual compatible authentication and trust policy.
  2. RADIUS authorization can assign network context after successful authentication.
  3. Private VLAN community ports have scoped peer reachability and promiscuous ports serve shared resources.
  4. Server-recovery behavior and authentication session lifecycle affect effective access.

Explanation

Correct Answer

D:

Server-recovery behavior and authentication session lifecycle affect effective access. In this situation, the relevant action is to configure supported reauthentication or session restoration after AAA recovery.

Incorrect Answers

A:

EAP credential validation requires mutual compatible authentication and trust policy. That principle is related to 802.1X EAP authentication credential validation, not the main RADIUS server-fail remediation and reauthentication choice. Failure to reauthorize after recovery can leave endpoints overprivileged or stuck in fallback.

B:

RADIUS authorization can assign network context after successful authentication. That principle is related to Dynamic VLAN assignment from RADIUS, not the main RADIUS server-fail remediation and reauthentication choice. Failure to reauthorize after recovery can leave endpoints overprivileged or stuck in fallback.

C:

Private VLAN community ports have scoped peer reachability and promiscuous ports serve shared resources. That principle is related to Private VLAN community and promiscuous roles, not the main RADIUS server-fail remediation and reauthentication choice. Failure to reauthorize after recovery can leave endpoints overprivileged or stuck in fallback.

Question 77

A switch has scheduler maps configured yet the intended forwarding class uses the default queue. Which technical principle BEST explains the Junos forwarding class to queue mapping decision?

  1. Successful CoS needs consistent ingress classification egress scheduling and congestion management.
  2. VXLAN data plane depends on routable VTEP endpoints independent of EVPN MAC learning.
  3. A CoS trust boundary defines whose markings should be honored.
  4. Forwarding classes express per-hop traffic treatment and map to transmission queues.

Explanation

Correct Answer

D:

Forwarding classes express per-hop traffic treatment and map to transmission queues. In this situation, the relevant action is to define suitable forwarding classes and their supported queue mappings.

Incorrect Answers

A:

Successful CoS needs consistent ingress classification egress scheduling and congestion management. That principle is related to CoS end-to-end verification of drop behavior, not the main Junos forwarding class to queue mapping choice. Naming a class Voice without mapping it does not guarantee queue scheduling.

B:

VXLAN data plane depends on routable VTEP endpoints independent of EVPN MAC learning. That principle is related to VXLAN VTEP loopback underlay route, not the main Junos forwarding class to queue mapping choice. Naming a class Voice without mapping it does not guarantee queue scheduling.

C:

A CoS trust boundary defines whose markings should be honored. That principle is related to QoS trust boundary at campus edge, not the main Junos forwarding class to queue mapping choice. Naming a class Voice without mapping it does not guarantee queue scheduling.

Question 78

A scheduler uses tiny buffers for bursty business traffic. Which technical principle BEST explains the Queue buffer-size allocation decision?

  1. Egress buffers absorb short bursts but cannot compensate for persistent overload.
  2. Shaping delays packets to smooth egress rate while policing meters and may drop.
  3. RADIUS outcomes express AAA authorization decisions separate from transport connectivity.
  4. Junos CoS decisions progress from ingress classification through queue scheduling to egress rewriting.

Explanation

Correct Answer

A:

Egress buffers absorb short bursts but cannot compensate for persistent overload. In this situation, the relevant action is to tune supported scheduler buffer sizes consistent with measured burst requirements.

Incorrect Answers

B:

Shaping delays packets to smooth egress rate while policing meters and may drop. That principle is related to Junos egress shaping rate, not the main Queue buffer-size allocation choice. Excessively small buffers cause avoidable drops while overlarge buffers increase delay.

C:

RADIUS outcomes express AAA authorization decisions separate from transport connectivity. That principle is related to RADIUS Access-Accept versus Access-Reject handling, not the main Queue buffer-size allocation choice. Excessively small buffers cause avoidable drops while overlarge buffers increase delay.

D:

Junos CoS decisions progress from ingress classification through queue scheduling to egress rewriting. That principle is related to CoS processing order ingress to egress, not the main Queue buffer-size allocation choice. Excessively small buffers cause avoidable drops while overlarge buffers increase delay.

Question 79

A shared printer moves ports and the security policy denies its MAC credentials. Which next investigation or correction is MOST appropriate?

  1. Review MAC authorization records and test denied unknown device.
  2. Test actual RADIUS outage distinct from deliberate Access-Reject responses.
  3. Place every MAC into the administrator allowlist to simplify printer onboarding.
  4. Test valid and invalid 802.1X plus MAC credentials across both endpoint classes.

Explanation

Correct Answer

A:

Review MAC authorization records and test denied unknown device. This checks whether registered printers receive limited required access while unknown MACs are rejected.

Incorrect Answers

B:

Test actual RADIUS outage distinct from deliberate Access-Reject responses. That check applies chiefly to RADIUS server unreachable fallback policy, not the current MAC RADIUS printer onboarding issue. MAC RADIUS can authorize nonsupplicant devices but MAC identity is easier to spoof.

C:

Place every MAC into the administrator allowlist to simplify printer onboarding. That bypass leaves the MAC RADIUS printer onboarding issue unresolved. Treating a MAC address as strong cryptographic proof can weaken segmentation.

D:

Test valid and invalid 802.1X plus MAC credentials across both endpoint classes. That check applies chiefly to 802.1X versus MAC RADIUS method priority, not the current MAC RADIUS printer onboarding issue. MAC RADIUS can authorize nonsupplicant devices but MAC identity is easier to spoof.

Question 80

A multiarea OSPF topology has a nonbackbone area disconnected from area zero. Which configuration or operational step BEST meets the stated requirement?

  1. Create a separate nonbackbone area ID at both ends and expect it to substitute for area zero.
  2. Configure compatible stub area attributes on all affected OSPF routers.
  3. Compare Hello packets area ID intervals and neighbor states before changing interface OSPF settings.
  4. Restore valid area 0 backbone connectivity and supported ABR relationships.

Explanation

Correct Answer

D:

Restore valid area 0 backbone connectivity and supported ABR relationships. Standard multi-area OSPF uses the backbone to exchange interarea information. The expected validation is that interarea prefixes traverse the intended backbone with stable SPF reachability.

Incorrect Answers

A:

Create a separate nonbackbone area ID at both ends and expect it to substitute for area zero. This is a risky or ineffective shortcut for OSPF area-border backbone connectivity. Designing arbitrary direct interarea exchanges without a backbone can partition routing.

B:

Configure compatible stub area attributes on all affected OSPF routers. This addresses OSPF stub area external LSA suppression rather than the required OSPF area-border backbone connectivity decision. Standard multi-area OSPF uses the backbone to exchange interarea information.

C:

Compare Hello packets area ID intervals and neighbor states before changing interface OSPF settings. This addresses OSPFv2 Hello and Dead timer adjacency rather than the required OSPF area-border backbone connectivity decision. Standard multi-area OSPF uses the backbone to exchange interarea information.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests