Juniper Junos Troubleshooting : JN0-690

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Juniper Junos Troubleshooting Sample Questions:

1. Which two statements are true regarding BGP path MTU discovery? (Choose two.)

A) BGP path MTU discovery alleviates fragmentation problems.
B) BGP path MTU discovery must be configured on every router along the path.
C) BGP path MTU discovery can be enabled only for IBGP sessions.
D) BGP path MTU discovery provides the most efficient use of link bandwidth.

2. Click the Exhibit button.
-- Exhibit -[edit] user@router# show interfaces
ge-1/1/2 {
vlan-tagging;
unit 100 {
vlan-id 100;
family inet {
address 192.168.0.1/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.10.10.1/32;
}
}
}
[edit]
user@router# show protocols ospf
area 0.0.0.0 {
interface ge-1/1/2.0 {
interface-type p2p;
metric 250;
}
interface lo0.0;
}
[edit]
user@router# run show ospf interface Interface State Area DR ID BDR ID Nbrs lo0.0 DR 0.0.0.0 10.10.10.1 0.0.0.0 0
[edit] user@router# -- Exhibit -
Referring to the exhibit, why does only the loopback interface appear in the show ospf interface output?

A) The incorrect logical unit for the ge-1/1/2 interface is configured under the OSPF hierarchy.
B) The metric configured on ge-1/1/2 is not valid.
C) The interface-type is not configured properly on the ge-1/1/2 interface.
D) The ge-1/1/2 interface is configured under the wrong OSPF area.

3. You want to reset all the PFE components with graceful Routing Engine switchover (GRES) disabled on the system. Which command should you use?

A) restart chassis-control immediately
B) restart chassis-control
C) restart routing
D) restart chassis-control soft

4. A customer operates a multi-vendor production network. They report that LSAs are aging out on Junos devices. Which OSPF parameter must be tuned to prevent this behavior?

A) hello interval
B) dead interval
C) LSA refresh interval
D) LSA retransmission interval

5. Click the Exhibit button.
-- Exhibit -user@r2# run show route 100.1.1.0/24 detail
inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
100.1.1.0/24 (1 entry, 1 announced) *Static PreferencE. 5 Next hop typE. Reject Address: 0x8f7b5a4 Next-hop reference count: 2 StatE. Local AS: 65001 AgE. 59 Task: RT Announcement bits (1): 2-KRT AS path: 65005 I
user@r2# show protocols bgp
group ibgp { type external; export to-bgp; neighbor 10.1.2.1 { local-address 10.1.2.2; family inet { unicast; } family inet6 { unicast; } peer-as 65005; }
}
user@r2# run show bgp summary Groups: 1 Peers: 1 Down peers: 0 Table Tot Paths Act Paths Suppressed History Damp State Pending inet6.0
0 0 0 0 0 0 inet.0 0 0 0 0 0 0 Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
10.1.2.1 65005 31 31 0 0 12:08 Establ inet6.0: 0/0/0/0 inet.0: 0/0/0/
user@r2# show policy-options
policy-statement to-bgp { from protocol static; then accept;
}
user@r2# run show route advertising-protocol bgp 10.1.2.1
[edit] user@r2# -- Exhibit -
Referring to the exhibit, router r2 does not advertise the static route to peer 10.1.2.1. What is the problem?

A) The export policy should be applied under the [edit protocols bgp group ibgp neighbor 10.1.2.1] hierarchy.
B) An AS path loop is detected.
C) The static route has Next hop typE. Reject.
D) The export policy is incorrect.

Solutions: