How should I use these Ethernet Switching And Spanning Tree practice questions?

Read each scenario carefully and choose your answer before revealing the explanation. Then check why your choice was right or wrong. Repeat until the reasoning feels automatic.

JNCIP-ENT · topic practice

Ethernet Switching And Spanning Tree practice questions

Q: Can I practise just Ethernet Switching And Spanning Tree questions in a focused session?

Yes — use the session launcher on this page to start a 10-, 20-, 30- or 50-question session drawn entirely from the Ethernet Switching And Spanning Tree domain.

Practise identifying common networking hardware like routers, switches, access points, and their roles in a network.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Reviewed byJohnson Ajibi· MSc IT Security

20 questionsDomain: Ethernet Switching And Spanning Tree

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What the exam tests

What to know about Ethernet Switching And Spanning Tree

Tests identification, purpose, and configuration of routers, switches, access points, and patch panels.

Identify routers, switches, and access points by function

Understand PoE and PoE+ power requirements

Differentiate managed vs unmanaged switches

Recognize cable types: Cat5e, Cat6, fiber

Why learners struggle

Why Ethernet Switching And Spanning Tree questions are commonly missed

Common Networking Hardware questions are often missed because learners confuse device functions and port types. The exam tests specific hardware features like PoE and managed switching that are easy to mix up.

·Router vs switch — routing vs switching function
·PoE vs PoE+ — power budget differences
·Managed vs unmanaged — configuration capability
·Access point vs router — wireless vs routing
·Patch panel vs switch — termination vs active
·Cat5e vs Cat6 — speed and frequency limits

Watch out for

Common Ethernet Switching And Spanning Tree exam traps

▸Confusing a switch with a router on the exam
▸Thinking all switches support PoE by default
▸Mixing up patch panel and switch roles
▸Assuming fiber requires the same connectors as copper

Practice set

Ethernet Switching And Spanning Tree questions

20 questions · select your answer, then reveal the explanation

Question 1mediummultiple choice

Open the full VLAN trunking answer →

You are reviewing the MSTP configuration on an EX4300 switch. You want to assign VLANs 10 through 50 to Multiple Spanning Tree Instance (MSTI) 2. Which syntax under 'protocols mstp' is correct?

Trap 1: set protocols mstp configuration-name Region1 revision 1 instance…

The keyword 'msti2' is invalid; instance names are user-defined strings, and VLAN ranges use standard Junos array notation.

Trap 2: set protocols mstp region-name Region1 instance-map instance-2 vlan…

This is an incorrect command structure for Junos MSTP.

Trap 3: set protocols mstp msti-instance 2 vlan-members 10-50

MSTI configuration syntax requires 'instance <name> vlan <list>'.

Study all Ethernet Switching And Spanning Tree common traps →

A
set protocols mstp configuration-name Region1 revision 1 instance msti2 vlan [ 10-50 ]
Why wrong: The keyword 'msti2' is invalid; instance names are user-defined strings, and VLAN ranges use standard Junos array notation.
B
set protocols mstp configuration-name Region1 instance instance2 vlan [ 10..50 ] or set protocols mstp region-name Region1 instance instance2 vlan 10-50
Junos configuration for MST instance mapping uses 'set protocols mstp configuration-name <name> instance <instance-name> vlan <vlan-list>'.
C
set protocols mstp region-name Region1 instance-map instance-2 vlan 10 to 50
Why wrong: This is an incorrect command structure for Junos MSTP.
D
set protocols mstp msti-instance 2 vlan-members 10-50
Why wrong: MSTI configuration syntax requires 'instance <name> vlan <list>'.

Ethernet Switching And Spanning Tree practice questions

What to know about Ethernet Switching And Spanning Tree

Why Ethernet Switching And Spanning Tree questions are commonly missed

Common Ethernet Switching And Spanning Tree exam traps

Ethernet Switching And Spanning Tree questions

You are reviewing the MSTP configuration on an EX4300 switch. You want to assign VLANs 10 through 50 to Multiple Spanning Tree Instance (MSTI) 2. Which syntax under 'protocols mstp' is correct?

An enterprise network uses VSTP. During a topology change, network administrators notice excessive flooding of broadcast traffic. Which Juniper configuration statement under 'protocols vstp' prevents unnecessary topology change flooding by restricting TCN propagation?

An administrator needs to configure a port on an EX series switch to act as a Designated Port in MSTP, forcing it to forward traffic regardless of incoming superior BPDUs from an untrusted switch. Which feature should be enabled on this port?

You are configuring a Juniper EX Series switch to participate in an existing VSTP domain. You notice that certain VLANs are not participating in VSTP and are dropping traffic. What is the default behavior of VSTP on a newly created VLAN in Junos?

You are configuring VSTP (VLAN Spanning Tree Protocol) on Juniper EX switches to interoperate with legacy third-party switches running PVST+. Which operational command allows you to verify the VSTP bridge identifier and root bridge status per VLAN?

When configuring advanced VLAN mapping on a Juniper MX Series router using flexible VLAN tagging, which term describes the action of replacing an incoming inner VLAN tag with a new tag before forwarding into the provider core?

You need to design a scalable Layer 2 architecture across multiple data center buildings using Juniper switches, avoiding single points of failure while preventing bridging loops. Which scaling mechanism allows Active-Active multihoming without running Spanning Tree Protocol across the core?

An administrator implements MSTP (Multiple Spanning Tree Protocol) in a large data center using Juniper switches. Region boundaries must be maintained strictly. Which three parameters must match identically across all switches for them to be considered part of the same MST region?

An enterprise network engineer needs to configure a trunk port on a Juniper EX Series switch running Junos OS to allow multiple VLANs while explicitly blocking VLAN 99. Which configuration statement under 'interfaces ge-0/0/1 unit 0 family ethernet-switching' correctly achieves this?

You are configuring Q-in-Q tunneling on an MX Series router where customer frames arrive with VLAN tag 100, and you need to encapsulate them with a service provider outer VLAN tag 3000 using 'vlan-map'. Where is the VLAN map applied?

You are configuring private VLANs (PVLANs) on a Juniper EX switch to isolate customer ports from one another while sharing a common gateway. Which VLAN type is configured to allow communication only with promiscuous ports?

An administrator needs to enable BPDU protection on edge access ports in a VSTP environment to prevent loops caused by unauthorized switches. Which command under 'protocols vstp' accomplishes this globally or per-interface?

An enterprise network runs MSTP across an EX Series core. An administrator wants to ensure that a specific core port never becomes the root port for any MSTI, protecting the upstream core path. Which command achieves this?

You are configuring MAC limiting on an EX Series switch interface to restrict the maximum number of learned MAC addresses to 10. What happens when the 11th unique MAC address attempts to communicate through the interface?

In a Juniper Virtual Chassis scaling deployment comprising 10 EX4600 switches, how are control and management planes structured across member switches to maintain high availability and failover resilience?

An engineer is troubleshooting a large-scale enterprise network with multiple MSTP regions connected by a legacy RSTP region. How do boundary switches running MSTP interact with RSTP switches on shared segments?

You want to configure voice VLAN functionality on a Juniper EX switch so that IP phones automatically place voice traffic into VLAN 50 while passing PC data through unchanged. Which feature should you configure?

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