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Juniper JN0-690 Exam Syllabus Topics:

Juniper Junos Troubleshooting Sample Questions:

1. Which two statements are correct about the show ospf route and the show route protocols ospf commands? (Choose two.)

A) show ospf route displays the entries in the Open Shortest Path First (OSPF) routing table.
B) show route protocols ospf displays the entries in the Open Shortest Path First (OSPF) routing table.
C) show route protocols ospf displays the route entries in the routing table that were learned through OSPF.
D) show ospf route displays the route entries in the routing table that were learned through OSPF.

2. Which two features would be deployed to prevent DoS attacks? (Choose two.)

A) loopback filter
B) Bidirectional Forward Detection (BFD)
C) ARP policer
D) periodic packet management (PPM)

3. Which operational CLI command would you use to troubleshoot hardware-related problems?

A) show system
B) show route
C) show cli
D) show chassis

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

5. Click the Exhibit button.
-- Exhibit -user@R1> show configuration interfaces xe-1/1/0 {
unit 0 { family inet {
address 17.1.1.1/24;
}
family mpls;
}
}
user@R1> ping 17.1.1.2 size 1473 do-not-fragment
PING 17.1.1.2 (17.1.1.2): 1473 data bytes
ping: sendto: Message too long
ping: sendto: Message too long
ping: sendto: Message too long
user@R1> ping 17.1.1.2 logical-system R1 size 1472 do-not-fragment
PING 17.1.1.2 (17.1.1.2): 1472 data bytes
1480 bytes from 17.1.1.2: icmp_seq=0 ttl=64 time=0.933 ms
1480 bytes from 17.1.1.2: icmp_seq=1 ttl=64 time=0.838 ms
1480 bytes from 17.1.1.2: icmp_seq=2 ttl=64 time=4.688 ms
-- Exhibit --
You are using the ping command to troubleshoot a suspected MTU problem.

A) The first ping fails because the Junos OS takes into account the CRC header while calculating the MTU.
B) Referring to the exhibit, which two statements are true? (Choose two.) The first ping fails because the do-not-fragment option is set.
C) The first ping fails because the Junos OS takes into account Layer 2 headers while calculating the MTU.
D) The first ping fails because the Junos OS takes into account ICMP and IP headers while calculating the MTU.

Solutions: