CloudLabBox
Try the free demo

JNCIS-ENT lab 1 of 17

Layer 2 switching and MAC learning

Turn a new Junos switch into a working access switch. You configure access ports the ELS way, watch the switch learn, flood and forward, read and clear the MAC table, change the ageing time and use interface ranges to configure many ports at once.

Run this lab

It needs Lite: its 3 nodes are set to 6 vCPU and 7,168 MB in total. That fits the free demo too.

In your workspace: Shared, then JNCIS-ENT JN0-352 guided labs, then 01 - Layer 2 switching and MAC learning

Try it free for 30 minutesRun it on Lite from £3 a day

The free demo needs no card and no email. Every lab plan includes every guided lab.

Level
Intermediate
Time
About 45 minutes
Nodes need
6 vCPU, 7,168 MB
Smallest plan
Lite

The scenario

Ashby Freight is replacing an old hub in the depot office with a Junos switch, SW1. Two PCs are already cabled: PC1 on ge-0/0/0 and PC2 on ge-0/0/1, both in the office subnet 10.10.10.0/24. The switch has only a basic system configuration: none of its ports switches yet.

What you’ll practise

  • Explain the bridging components of a Junos switch: ports, VLANs and the MAC table
  • Describe how a switch learns, floods, forwards and filters frames
  • Configure access ports with family ethernet-switching (ELS syntax) and interface ranges
  • Read and clear the Ethernet switching table and set the MAC ageing time

The tasks

  1. A switch out of the box
  2. Make two access ports
  3. Learning, flooding and forwarding
  4. Configure many ports at once
  5. Look at the frames

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of Layer 2 switching and MAC learning3 nodes, 2 links. Every link is listed as text below the diagram.SW1PC1PC2ge-0/0/0eth0ge-0/0/1eth0
3 nodes, with the interface names each link uses.
Every link, as text
  • SW1 ge-0/0/0 to PC1 eth0
  • SW1 ge-0/0/1 to PC2 eth0
Nodes in Layer 2 switching and MAC learning, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
SW1Juniper vJunos-switchvjunosswitch-23.4R2-S2.14 vCPU, 5,120 MB
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
PC2VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder JNCIS-ENT JN0-352 guided labs.

  3. Open 01 - Layer 2 switching and MAC learning and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

More JNCIS-ENT labs

All JNCIS-ENT labs

CloudLabBox is independent of Juniper Networks. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.