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Juniper JN0-690 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Data Plane & Interfaces Troubleshooting | 20% | - Interface configuration, status & errors - CoS, filters & policer issues - Forwarding table & packet flow analysis |
| Topic 2: High Availability & Network Services | 15% | - Graceful restart & non-stop routing - DHCP, DNS, NTP & authentication services - Chassis cluster & redundancy groups |
| Topic 3: Troubleshooting Methodology & Tools | 15% | - Logging, monitoring & packet capture tools - Junos CLI commands & diagnostic utilities - Systematic troubleshooting approach |
| Topic 4: Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - Ethernet, VLAN, STP & LACP - VRRP, BFD & high availability protocols |
| Topic 5: Control Plane Troubleshooting | 20% | - Protocol control messages & routing tables - Routing Engine operations & health - Control plane protection & DDoS mitigation |
| Topic 6: Chassis & Hardware Troubleshooting | 15% | - Power, cooling & FPC/PIC issues - Boot process & system startup problems - Hardware components & status monitoring |
Juniper Junos Troubleshooting Sample Questions:
1. Click the Exhibit button.
-- Exhibit -user@host > show chassis craft-interface
Front Panel System LEDs: Routing Engine 0 1
OK * . Fail . * Master * .
Front Panel Alarm Indicators:
Red LED .
Yellow LED *
Major relay .
Minor relay *
Front Panel FPC LEDs:
FPC 0 1 2 3 4 5 6 7 8 9
Red . . . . . . . . . . Green * * . . . . . . * * CB LEDs:
CB 0 1
Amber . . Green * *
PS LEDs: PS 0 1 2 3 4 5 6 7 8
Red . . . . . . . . . Green . . . . * * * * *
Fan Tray LEDs: FT 0 1 2 3
Red . . . . Green * * * *
Front Panel SFB LEDs: SFB 0 1 2 3 4 5 6 7
Red . . . . . . . . Green * * * * * * * *
Front Panel Chassis Info: Chassis Number 0x0 Chassis Role S
-- Exhibit -
Referring to the exhibit, which statement is true?
A) Routing Engine 1 is OK, the red LED is lit, and the major alarm relay is on.
B) Routing Engine 1 has failed, yellow LED is lit, and the major alarm relay is on.
C) Routing Engine 1 has failed, yellow LED is lit, and the minor alarm relay is on.
D) Routing Engine 1 is OK, the red LED is lit, and the minor alarm relay is on.
2. Which route would a packet destined to 192.168.14. take?
A) 192.168.14.0/24 *[BGP/70]
B) 192.168.14.0/24 *[BGP/100]
C) 192.168.64.0/21 *[Direct/0]
D) 192.168.14.0/24 *[BGP/200]
3. Click the Exhibit button.
-- Exhibit -user@router> show snmp statistics
SNMP statistics: Input: Packets: 246213, Bad versions: 12, Bad community names: 12, Bad community uses: 0, ASN parse errors: 0, Too bigs: 0, No such names: 0, Bad values: 0, Read onlys: 0, General errors: 0,
Total request varbinds: 227084, Total set varbinds: 67,
Get requests: 44942, Get nexts: 1 , Set requests: 10712,
Get responses: 0, Traps: 0,
Silent drops: 0, Proxy drops: 0, Commit pending drops: 0,
Throttle drops: 0,
V3 Input:
Unknown security models: 0, Invalid messages: 0
Unknown pdu handlers: 0, Unavailable contexts: 0
Unknown contexts: 0, Unsupported security levels: 0
Not in time windows: 0, Unknown user names: 0
Unknown engine ids: 0, Wrong digests: 0, Decryption errors: 0
Output:
Packets: 246093, Too bigs: 0, No such names: 0,
Bad values: 0, General errors: 0,
Get requests: 0, Get nexts: 0, Set requests: 0,
Get responses: 246025, Traps: 0
-- Exhibit --
A new SNMP session has recently been implemented on this router and is experiencing problems sending and receiving SNMP information.
Referring to the exhibit, which two problems are indicated by the received messages from the NMS? (Choose two.)
A) unsupported SNMP community name
B) invalid SNMP version indicated
C) unknown SNMP community name
D) unsupported SNMP version indicated
4. In Junos, which process has its own internal task scheduler?
A) rpd
B) chassisd
C) ppmd
D) mgd
5. 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 route entries in the routing table that were learned through OSPF.
C) show ospf route displays the route entries in the routing table that were learned through OSPF.
D) show route protocols ospf displays the entries in the Open Shortest Path First (OSPF) routing table.
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: A | Question # 3 Answer: C,D | Question # 4 Answer: A | Question # 5 Answer: A,B |
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