Which Junos operational command shows the spanning-tree port role and state, including whether root protection is active?

show interfaces ge-0/0/1 extensive

show log messages | match root-protection

Which Junos configuration statement enables loop protection on an interface?

set interfaces ge-0/0/1 unit 0 family ethernet-switching loop-protection

set protocols rstp interface ge-0/0/1 loop-protection

set security spanning-tree loop-protection interface ge-0/0/1

set ethernet-switching-options loop-protection interface ge-0/0/1

Which log message would indicate that BPDU protection has been triggered on an interface?

MAC address limit exceeded on interface ge-0/0/1

BPDU received on protected port ge-0/0/1

Spanning tree topology change detected

A port is in a loop-inconsistent state. What is the most likely cause?

BPDUs have stopped being received on the port

The port has been manually disabled

The port has exceeded its MAC address limit

The port has received a superior BPDU

Juniper NetworksCertified Specialist, Enterprise Routing and Switching (JNCIS-ENT)

Domain 3Objective 6

Configure, Monitor, or Troubleshoot Layer 2 Protection and Port Security JN0-352 Practice Questions (Page 6)

Part of the Layer 2 Security domain, which makes up ~13% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~5–8 in this domain), expect 1–1 from this objective — we provide 30 practice questions to prepare you well beyond it. (estimate)

30questions here

6free pages

14concepts

14 Concepts in This Objective

Layer 2 protection mechanisms
Port security basics
Configuring port security
Monitoring port security
Troubleshooting port security
Configuring BPDU protection
Monitoring BPDU protection
Troubleshooting BPDU protection
Configuring root protection
Monitoring root protection
Troubleshooting root protection
Configuring loop protection
Monitoring loop protection
Troubleshooting loop protection

Questions 26–30

26foundation · easy
Which Junos operational command shows the spanning-tree port role and state, including whether root protection is active?
Select an answer first
27foundation · easy
Which Junos configuration statement enables loop protection on an interface?
Select an answer first
28foundation · easy
Which log message would indicate that BPDU protection has been triggered on an interface?
Select an answer first
29foundation · easy
A port is in a loop-inconsistent state. What is the most likely cause?
Select an answer first
30foundation · easy
Which Layer 2 protection feature places a port into an error-disabled state when it receives any BPDU, typically to prevent unauthorized switches from connecting?
Select an answer first

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