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2021 Oct JN0-643 free draindumps

Q41. Your company asks you to configure multicast routing on a Junos device. They tell you that the router at IP address 192.168.1.4 is the root of the shared multicast delivery tree. 

Which command allows you to configure the Junos device as a non-RP router for PIM? 

A. set protocols pim rp local family inet disable 

B. set protocols pim rp local address 192.168.1.4 

C. set protocols pim rp static address 192.168.1.4 

D. set protocols pim rp auto-rp announce 

Answer: C 


Q42. You are asked to implement VSTP on all devices in your Layer 2 network. 

Which three statements are correct? (Choose three.) 

A. VSTP supports up to 256 different spanning-tree topologies. 

B. A BPDU is sent for each spanning-tree instance. 

C. Each VLAN will be assigned to a unique spanning-tree instance. 

D. MSTP can be used in addition to VSTP to account for VLANs outside of the supported range. 

E. VSTP can be used to load-balance Layer 2 traffic using VLANs. 

Answer: B,C,E 


Q43. -- Exhibit –

[edit protocols] 

user@switch# commit 

[edit protocols ]

'mstp' 

Another xSTP protocol is enabled 

error : Another xSTP protocol is enabled 

error: configuration check-out failed -- Exhibit --

Click the Exhibit button. 

Referring to the exhibit, a customer is receiving an error while committing the operation on the switch. 

What are two reasons for this problem? (Choose two.) 

A. VSTP and RSTP are both configured. 

B. MSTP and RSTP are both configured. 

C. Only STP is configured. 

D. MSTP and STP are both configured. 

Answer: B,D 


Q44. Which CoS feature avoids congestion in a device by limiting traffic on ingress interfaces? 

A. rewrite rule 

B. scheduler 

C. drop profile 

D. policer 

Answer: A 


Q45. -- 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]; 

} 

user@SwitchA>monitor traffic interface xe-0/0/0 no-resolve extensive 

10:36:00.594220 Out STP 802.1s, Rapid STP, CIST Flags [Forward, Agreement], CIST bridge-id 4000.5c:5e:ab:72:da:41.8215, length 118 

message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s 

CIST root-id 4000.5c:5e:ab:72:da:41, ext-pathcost 0 int-pathcost 0, port-role Designated 

CIST regional-root-id 4000.5c:5e:ab:72:da:41 

MSTP Configuration Name regio-2, revision 0, digest ca136a235706b316c8db8f921067a68f 

CIST remaining-hops 20 

MSTI 1, Flags [Proposal, Forward, Agreement], port-role Designated 

MSTI regional-root-id 4001.5c:5e:ab:72:da:41, pathcost 0 

MSTI bridge-prio 4, port-prio 8, hops 2010:36:00.594220 

10:36:00.594223 Out 802.1s, Rapid STP, CIST Flags [Forward, Agreement], CIST bridge-id 

4000.5c:5e:ab:72:da:41.8215, length 118 

message-age 0.00s, max-age 20.00s, hello-time 2.00s, forwarding-delay 15.00s 

CIST root-id 4000.5c:5e:ab:72:da:41, ext-pathcost 0 int-pathcost 0, port-role Designated 

CIST regional-root-id 4000.5c:5e:ab:72:da:41 

MSTP Configuration Name regio-2, revision 0, digest ca136a235706b316c8db8f921067a68f 

CIST remaining-hops 20 MSTI 1, Flags [Proposal, Forward, Agreement], port-role Designated 

MSTI regional-root-id 4001.5c:5e:ab:72:da:41, pathcost 0 

MSTI bridge-prio 4, port-prio 8, hops 20 

-- Exhibit --

Click the Exhibit button. 

Referring to the exhibit, a customer notices that MSTP is not converging on MSTI 2. To troubleshoot the problem, the customer captured traffic on the link (xe-0/0/0) of SwitchA connecting to SwitchB. 

Which two situations would cause the problem? (Choose two.) 

A. MSTI 1 and MSTI 2 are part of the same MSTP region. 

B. The bridge priority value of the MSTI 2 is the same on SwitchA and SwitchB. 

C. VLAN 30 and VLAN 40 are not configured on SwitchA. 

D. VLAN 30 and VLAN 40 are not members of trunk link xe-0/0/0 on SwitchA. 

Answer: C,D 


Rebirth JN0-643 practice:

Q46. -- 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 


Q47. On your EX Series switch you must configure a delay buffer for the best effort queue scheduler named BE-sch which restricts the buffer usage to only 25 percent of the available buffer size. 

Which configuration statement will accomplish this task? 

A. [edit class-of-service schedulers BE-sch] 

user@switch# set buffer-size buffer-size temporal 25 

B. [edit class-of-service schedulers BE-sch] 

user@switch# set buffer-size buffer-size temporal 25 exact 

C. [edit class-of-service schedulers BE-sch] 

user@switch# set buffer-size percent 25 

D. [edit class-of-service schedulers BE-sch] 

user@switch# set buffer-size exact percent 25 

Answer: D 


Q48. -- Exhibit – 

-- Exhibit --

Click the Exhibit button. 

R1 is connected to both R2 and R3 and you want to load-balance outbound traffic. You have provided the configuration shown in the exhibit; however, after checking the links you notice that the traffic is not load-balancing. 

Which configuration must be added? 

A. set protocols bgp group external multihop 

B. set protocols bgp group external multipath 

C. set protocols bgp group external advertise-external 

D. set policy-options policy-statement loadbal then accept 

Answer: B 


Q49. Area 1 is configured as an NSSA with no summaries. 

Which three types of LSAs are allowed in Area 1's database? (Choose three.) 

A. Type 1 

B. Type 2 

C. Type 3 

D. Type 5 

E. Type 7 

Answer: A,B,E 


Q50. Click the Exhibit button. 

You are asked to connect Area 2 to the backbone. 

Which configuration would be required on R3? 

A. [edit protocols ospf3] 

user@R3# show 

area 0.0.0.0 { 

virtual-link neighbor-id 10.0.10.1 transit-area 0.0.0.1; 

interface ge-0/0/5.0; 

} 

B. [edit protocols ospf] 

user@R3# show 

area 0.0.0.0 { 

virtual-link neighbor-id 192.168.1.2 transit-area 0.0.0.1; 

interface ge-0/0/5.0 { 

interface-type p2p; 

} 

} 

C. [edit protocols ospf3] 

user@R3# show 

area 0.0.0.0 { 

virtual-link neighbor-id 192.168.1.2 transit-area 0.0.0.1; 

interface ge-0/0/5.0; 

} 

D. [edit protocols ospf3] 

user@R3# show 

area 0.0.0.1 { 

virtual-link neighbor-id 192.168.1.2 transit-area 0.0.0.1; 

interface ge-0/0/5.0; 

} 

Answer: C