JN0-694 Enterprise Routing and Switching Support, Professional (JNCSP-ENT)

JNCSP-ENT Exam Objectives (Exam: JN0-694)

IGP Troubleshooting
Given a scenario, demonstrate knowledge of how to troubleshoot OSPFv2 and OSPFv3 issues on Junos devices
Routing issues
Neighbor/adjacency issues
Configuration issues

BGP Troubleshooting
Given a scenario, demonstrate knowledge of how to troubleshoot BGP issues on Junos devices
Peering issues
Routing issues
Next hop resolution issues
Configuration issues

Routing Policy Troubleshooting
Given a scenario, demonstrate knowledge of how to troubleshoot routing policy issues on Junos devices
Forwarding table policy issues
Routing instance issues
IGP policy issues
BGP policy issues
Configuration issues

Layer 2 Switching Troubleshooting
Given a scenario, demonstrate knowledge of how to troubleshoot Spanning Tree issues on Junos devices
STP
RSTP
MSTP
VSTP
Configuration issues
Given a scenario, demonstrate knowledge of how to troubleshoot other Layer 2 switching and High Availability issues on Junos devices
VLAN issues
Q-in-Q tunneling and L2PT issues
Layer 2 port security issues
Authentication and access control issues
Virtual chassis
Configuration issues

Multicast Troubleshooting
Given a scenario, demonstrate knowledge of how to troubleshoot multicast issues on Junos devices
RP issues
SPT issues
PIM issues
IGMP issues
Configuration issues

Class of Service (CoS) Troubleshooting
Given a scenario, demonstrate knowledge of how to troubleshoot CoS issues
Classification and rewrite issues
Policer issues
Queuing/scheduling issues
Packet drop issues
Configuration issues

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QUESTION 1
You are implementing Q-in-Q tunneling on an EX Series switch. You want the tunnel to support all
C-VLANs; however, only some VLANs are able to send traffic across the tunnel. Switch-1 has the
following configuration:
[edit vlans]
user@Switch-1# show
v100 {
vlan-id 100;
interface {
ge-0/0/0.10;
ge-0/0/1.20;
}
dot1q-tunneling {
customer-vlans [ ];
}
}
What would solve this problem?

A. Add family ethernet-switching to the tunnel-side interface on Switch-1.
B. Implement RSTP.
C. Q-in-Q tunneling will not work in this scenario; use a Layer 2 VPN instead.
D. Remove the customer-vlans statement.

Answer: C

Explanation:

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QUESTION 2
You are troubleshooting a problem where an OSPF adjacency between two neighboring routers will not form.
What are two reasons for this problem? (Choose two.)

A. One or both of the connected interfaces are missing the family inet statement.
B. One or both of the connected interfaces are missing the family iso statement.
C. The connected interfaces are not on the same subnet.
D. Another IGP is running on one or both of the routers, overriding OSPF.

Answer: B,D

Explanation:

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QUESTION 3
Your Junos device is dropping certain traffic flows, while allowing other traffic flows to pass through the device unaffected.
Which CoS component is causing this problem?

A. BA classification
B. RED
C. MF classification
D. Rewrite rules

Answer: D

Explanation:

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QUESTION 4
Two neighboring routers are able to form an OSPF adjacency, but are not able to establish an IBGP neighborship.
What are two reasons for the IBGP neighborship problem? (Choose two.)

A. One of the devices has a misconfigured BGP peer address.
B. One or both of the connected interfaces are missing the family iso statement.
C. OSPF has a lower route preference than BGP.
D. A firewall filter on one of the interfaces is blocking TCP traffic.

Answer: B,C

Explanation:

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