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2021 Sep JN0-643 testing engine
Q61. Which statement is true about MVRP?
A. It allows you to split a broadcast domain into multiple isolated broadcast subdomains.
B. It dynamically manages VLAN registration in a LAN.
C. It maps multiple independent spanning-tree instances onto one physical topology.
D. It is a Layer 2 protocol that facilitates network and neighbor discovery.
Answer: A
Q62. -- Exhibit –
-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, which LSA type will Router R2 inject into Area 1?
A. Type 3 LSA
B. Type 4 LSA
C. Type 5 LSA
D. Type 7 LSA
Answer: A
Q63. How does an administrator block IGMP reports for the 239.0.0.0/8 group range?
A. Create a routing policy and apply it to IGMP using the group-policy feature.
B. Create a routing policy and apply it to IGMP using the report-policy feature.
C. Create a routing policy and apply it to IGMP as export.
D. Create a routing policy and apply it to IGMP as import.
Answer: A
Q64. You notice that a number of IGMP leave group messages are passing through a BMA network and are impacting the network's performance.
What would you do to resolve this issue without affecting multicast traffic?
A. Apply an import policy to control leave group messages.
B. Suppress group-specific queries.
C. Suppress generic IGMP queries.
D. Enable promiscuous-mode in IGMP.
Answer: B
Q65. Which CoS component helps with TCP global synchronization problems?
A. WRR with rewrite rules
B. WRED with drop profiles
C. tail drop profiles with a behavior aggregate classifier
D. exact term with a scheduler
Answer: B
Leading JN0-643 test question:
Q66. -- Exhibit –
user@router>show route advertising-protocol bgp 172.16.36.1
inet.0: 31 destinations, 31 routes (31 active, 0 holddown, 0 hidden)
Prefix Nexthop MED Lclpref ASpath
* 10.200.17.0/24 Self I
* 10.200.19.0/24 Self I
-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, which three actions would summarize these routes to a BGP peer? (Choose three.)
A. Create a policy that accepts the more specific contributing routes.
B. Create a route to 10.200.16.0/21 with a next hop of 172.16.36.1 under the [edit routing-options static] hierarchy.
C. Create a policy that rejects the more specific contributing routes.
D. Create a policy to accept aggregate routes.
E. Create a 10.200.16.0/22 route under the [edit routing-options aggregate] hierarchy.
Answer: C,D,E
Q67. Click the Exhibit button.
You are asked to allow a customer to tunnel STP BPDUs from Customer Switch1 to Customer Switch2 for VLAN 300 on S-VLAN v500. You have administrative access to SW1 and SW3, but not SW2.
Referring to the exhibit, which three configuration statements must be added to SW1 to allow ingress STP BPDUs on port ge-0/0/16 to pass to SW3 for VLAN 300 only? (Choose three.)
A. set vlans v500 vlan-id 500 interface ge-0/0/16.0 mapping 300 swap
B. set vlans v500 vlan-id 500 dot1q-tunneling layer2-protocol-tunneling stp
C. set vlans v500 vlan-id 500 interface ge-0/0/16.0 mapping 300 push
D. set ethernet-switching-options dot1q-tunneling ether-type 0x8100
E. set vlans v500 vlan-id 500 interface ge-0/0/20.0 mapping 300 push
Answer: B,C,D
Q68. Which statement is true regarding the SPF algorithm?
A. The SPF algorithm is run on a per-domain basis.
B. If you apply an import policy to OSPF, it keeps LSAs from being flooded, and the SPF calculation can be affected.
C. There are two databases used in the calculation, the link-state database and the tree database.
D. The SPF calculation is run on a per-area basis on each router.
Answer: D
Q69. -- Exhibit –
-- Exhibit --
Click the Exhibit button.
You are the administrator for the network shown in the exhibit. R1 receives the 196.15.4.0/24 route from routers R2, R3, and R4. Local preference values have not been modified in this network. You are asked to ensure that R1 prefers the path through AS 3149 for traffic destined to 196.15.4.0/24.
Which two methods will accomplish this task? (Choose two.)
A. Configure a lower local preference on R3.
B. Configure as-path-prepend on R2 and R4.
C. Configure local-as on R3.
D. Configure always-compare-med on R1.
Answer: B,D
Q70. Click the Exhibit button.
Based on the exhibit, which statement about the Layer 2 topology is true?
A. A port on switch 3 or switch 4 towards the CST root (switch 6) is blocking traffic.
B. A total of 64 MST instances for MST region A and region B can be configured.
C. MSTI BPDUs are exchanged between MST regions and the CST root bridge.
D. IST BPDUs are exchanged only between switches 1 and 2, and between switches 6 and 7.
Answer: A