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2021 Sep JN0-643 answers
Q21. You are asked to implement a captive portal on your EX Series switches.
What are three required steps? (Choose three.)
A. You must create the captive portal login page.
B. You must ensure the Web service is turned on.
C. You must specify the interfaces participating in the captive portal.
D. You must create and apply an authentication profile.
E. You must create an authentication whitelist.
Answer: B,C,D
Q22. Two PCs are attached to a hub, which is attached to port ge-0/0/0 on your EX Series switch. You must separate the incoming traffic from the PCs into two VLANs.
What should you use to accomplish this task?
A. dynamic VLAN registration with MVRP
B. private VLAN
C. filter-based VLAN
D. guest VLAN
Answer: C
Q23. -- Exhibit --
user@switch# run show spanning-tree statistics interface ge-0/0/0
STP interface statistics for VLAN 10
Interface BPDUs sent BPDUs received Next BPDU
transmission
ge-0/0/0.0 170 3 0
STP interface statistics for VLAN 20
Interface BPDUs sent BPDUs received Next BPDU
transmission
ge-0/0/0.0 171 3 0
-- Exhibit --
Click the Exhibit button.
Based on the exhibit, which spanning-tree protocol is running on ge-0/0/0?
A. VSTP
B. MSTP
C. RSTP
D. PVST
Answer: A
Q24. -- Exhibit --
[edit class-of-service]
drop-profiles {
test-drop { fill-level 20 drop-probability 35;
fill-level 55 drop-probability 60;
fill-level 70 drop-probability 80;
fill-level 95 drop-probability 100;
}
}
-- Exhibit --
Click the Exhibit button.
According to the configuration shown in the exhibit, what percentage of the traffic will be dropped when the queue fill level reaches 65 percent?
A. 25
B. 50
C. 58
D. 60
Answer: D
Q25. Click the Exhibit button.
In the exhibit, Switch A is an EX4200. VLAN10 is receiving tagged as well as untagged traffic from different ports. The administrator wants to mirror all tagged and untagged traffic entering VLAN10 to analyzer port ge-0/0/10. All VLAN tags must be preserved for traffic that is mirrored to the analyzer port.
Which configuration will achieve this?
A. set ethernet-switching-options analyzer vlan10_analyzer input vlan VLAN10 interface xe-1/0/0.0
set ethernet-switching-options analyzer vlan10_analyzer input vlan VLAN10 interface ge-0/0/2
set ethernet-switching-options analyzer vlan10_analyzer output interface ge-0/0/10.0
B. set ethernet-switching-options analyzer vlan10_analyzer input interface xe-1/0/0.0
set ethernet-switching-options analyzer vlan10_analyzer input interface ge-0/0/2
set ethernet-switching-options analyzer vlan10_analyzer output interface ge-0/0/10.0
C. set ethernet-switching-options analyzer vlan10_analyzer input ingress vlan VLAN10
set ethernet-switching-options analyzer vlan10_analyzer output interface ge-0/0/10.0
set vlans default interface ge-0/0/10.0
D. set ethernet-switching-options analyzer vlan10_analyzer input ingress vlan VLAN10
set ethernet-switching-options analyzer vlan10_analyzer output interface ge-0/0/10.0
set vlans VLAN10 interface ge-0/0/10.0
Answer: C
Renovate JN0-643 free practice questions:
Q26. -- Exhibit –
-- Exhibit --
Click the Exhibit button.
Referring to the exhibit and based on the output below from Sw-1 and Sw-2, which statement is true?
Sw-1> show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : juniper
Revision : 1 Configuration digest : 0x9357ebb7a8d74dd5fef4f2bab50531aa
MSTI Member VLANs 0 0-9,11-19,21-4094 1 10 2 20
Sw-2# run show spanning-tree mstp configuration
MSTP information
Context identifier : 0
Region name : juniper
Revision : 1
Configuration digest : 0x387b5f2ea2394b14e091f0921ee7b9a8
MSTI Member VLANs
0 0-9,11-14,16-19,21-4094 1 10,15 2 20
A. There will be only one MSTI 2 root bridge.
B. There will be only one CST root bridge.
C. Sw-1 and Sw-2 are in different MSTP regions.
D. There will be only one CIST root bridge.
Answer: C
Q27. -- Exhibit --
[edit protocols vstp]
'vlan all'
Cannot configure VSTP on all VLANs when more than 253 VLANs are configured. Configure vstp
vlan-group along with STP or RSTP to cover all VLANs
[edit protocols]
'vstp'
Failed to configure vstp on all vlans error: configuration check-out failed -- Exhibit --
Click the Exhibit button.
What are two reasons for the commit error shown in the exhibit? (Choose two.)
A. The set protocols vstp vlan all configuration is not supported.
B. There are more than 253 VLANs configured on the switch.
C. MSTP is not configured with VSTP.
D. STP or RSTP is not configured along with VSTP on the switch.
Answer: B,D
Q28. -- Exhibit –
user@SwitchA# show protocols mstp configuration-name region1;
bridge-priority 16k;
msti 1 {
bridge-priority 16k;
vlan [10 20];
}
msti 2 {
bridge-priority 8k;
vlan [30 40];
}
user@SwitchB# show protocols mstp
configuration-name region1;
bridge-priority 8k;
msti 1 {
bridge-priority 16k;
vlan [10 20];
}
msti 2 {
bridge-priority 8k;
vlan [30 40 50];
}
-- Exhibit --
Click the Exhibit button.
Referring to the exhibit, a customer observes that the MSTP instance between SwitchA and SwitchB is not converging correctly.
What is causing the problem?
A. The bridge priority values of MSTI 2 are the same.
B. There is a VLAN mismatch between the two switches for MSTI 2.
C. There is a bridge priority mismatch.
D. MSTI 1 and MSTI 2 are part of the same the MSTP region.
Answer: B
Q29. You are implementing MSTP in your network.
Which three values must match on all switches within the MST region? (Choose three)
A. Context identifier
B. Region name
C. VLANs
D. Revision
E. Configuration manifest
Answer: B,C,D
Q30. A Layer 2 forwarding loop occurred on your network during a scheduled maintenance period. You must prevent this behavior in the future.
Which protocol should you enable on the EX Series switch to address this condition in the future?
A. DVMRP
B. L2TPv3
C. STP
D. RSVP
Answer: C