Service Provider Routing and Switching

Here you have the best Juniper JN0-661 practice exam questions

  • You have 62 total questions to study from
  • Each page has 5 questions, making a total of 13 pages
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  • This questions were last updated on October 17, 2025
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Question 1 of 62
Click the Exhibit button.
[edit]
user@PE-1# run show l2 circuit connections
Layer-2 Circuit Connections:
Legend for connection status (St)
EI - - encapsulation invalid NP - - interface h/w not present
MM - - mtu mismatch Dn - - down
EM - - encapsulation mismatch VC-Dn - -

Virtual circuit Down -
CM - - control-word mismatch Up - -
operational
VM - - vlan id mismatch CF - - Call
admission control failure
OL - - no outgoing label IB - - TDM
incompatible bitrare
NC - - intf encaps not CCC/TCC TM - - TDM
misconfiguration
BK - - Backup Connection ST - - Standby

Connection -
CB - - rcvd cell-bundle size bad SP - - Static

Pseudowire -
LD - - local site signaled down RS - - remote
site standby
RD - - remote site signaled down XX - - unknown

Legend for interface status -

Up - - operational -

Dn - - down -

Neighbor: 4.4.4.4 -
Interface Type St Time
last up #Up trans
ge-0/0/1.512 (vc 1) rmt OL
[edit]
user@PE-1# show protocols ldp
interface ge-0/0/2.0;
[edit]
user@PE-1# show protocols l2circuit
neighbor 4.4.4.4 {
interface ge-0/0/1.512 {
virtual-circuit-id 1
}
}
[edit]
user@PE-1# show interfaces ge-0/0/1
vlan-tagging;
encapsulation vlan-ccc;
unit 512 {
encapsulation vlan-ccc;
vlan-id 512;
}
[edit]
uxer@P-1 # show protocols ldp
interface all;
[edit]
user@P-2# show protocols ldp
interface all;
[edit]
user@PE-2# run show l2circuit connections
Layer-2 Circuit Connections:
Legend For connection status (St)
EI - - encapsulation invalid NP - - interface h/w not present
MM - - mtu mismatch Dn - - down
EM - - encapsulation mismatch VC-Dn - -

Virtual circuit Down -
CM - - control-word mismatch Up - -
operational
VM - - vlan id mismatch CF - - Call
admission control failure
OL - - no outgoing label IB - - TDM
incompatible bitrate
NC - - intf encaps not CCC/TCC TM - - TDM
misconfiguration
BK - - Backup Connection ST - - Standby

Connection -
CB - - rcvd cell-bundle size bad SP - - Static

Psewdowire -
LD - - Local site signaled down RS - - remote
site standby
RD - - remote site signaled down XX - - unknown

Legend for interface status -

UP - - operational -

DN - - down -

Neighbor: 1.1.1.1 -
Interface Type St Time
last up #Up trans
ge-0/0/1.512 (vc 1) rmt OL
[edit]
user@PE-2# show protocols ldp
interface ge-0/0/2.0;
[edit]
user@PE-2# show protocols l2circuit
neighbor 1.1.1.1 {
interface ge-0/0/1.512 {
virtual-circuit-id 1;
}
}
[edit]
user@PE-2# show interfaces ge-0/0/1
vlan-tagging;
encapsulation vlan-ccc;
unit 512 {
encapsulation vlan-ccc;
vlan-id 512;
}
Referring to the exhibit, you have configured an L2 circuit that connects Site-1 and Site-2, but the L2 circuit is not functioning. The topology in this scenario is shown below.
Site-1 > PE-1 > P-1 > P-2 > PE-2 Site-2
Which action will allow communication between Site-1 and Site-2?
    Correct Answer: C

Question 2 of 62
Click the exhibit button.
[edit protocols pim]
user@R1# show
rp {
bootstrap {
family inet {
priority 250;
}
}
local {
address 10.220.1.1;
priority 1;
group-ranges {
224.1.1.11/32;
224.0.0.0/4;
}
}
}
interface all;
interface fxp0.0 {
disable;
}
[edit protocols pim]
user@R4# show
rp {
bootstrap {
family inet {
priority 249;
}
}
local {
address 10.220.1.4;
priority 5;
group-ranges {
224.1.1.12/32;
224.0.0.0/4;
}
}
}
interface all;
interface fxp0.0 {
disable;
}
Referring to the exhibit, which router will be the RP?
    Correct Answer: A

Question 3 of 62
Click the Exhibit button.
[edit] [edit]
lab@r1# show protocols lab@r2# show protocols
ospf3 { ospf3 {
area 0.0.0.0 { area 0.0.0.0 {
interface 1o0.0; interface 1o0.0;
interface ge-1/0/6.0; interface ge-1/0/7.0;
}
}
lo0 = 172.16.100.1/32 [edit]
fc00:1000::1/128 lab@r2# show protocols
ospf3 {
area 0.0.0.0 {
interface 1o0.0;
interface ge-1/1/7.0;
interface ge-1/1/6.0;
}
}
You must ensure that r1's IPv4 loopback address exists in r3's inet 0 routing table.
Referring to the exhibit, which statement is true?
    Correct Answer: C

Question 4 of 62
Click the Exhibit button.
Exam JN0-661: Question 4 - Image 1
Referring to the exhibit, you have a network that uses PIM-SM and you need to block certain PIM register messages.
Which two statements are correct in this situation? (Choose two.)
    Correct Answer: A

Question 5 of 62
Which statements are true about NG MVPNs? (Choose two.)
    Correct Answer: B, D