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HCIA-Datacom lab 2 of 22

IPv4 subnetting with ARP and ICMP

Carve one /24 into right-sized subnets with VLSM, address two routers and two hosts, then use ARP and ICMP to prove what works and to explain what doesn't, including the classic missing return route.

Run this lab

It needs Lite: its 4 nodes are set to 4 vCPU and 6,144 MB in total. That fits the free demo too.

In your workspace: Shared, then HCIA-Datacom H12-811 guided labs, then 02 - IPv4 subnetting with ARP and ICMP

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Level
Beginner
Time
About 50 minutes
Nodes need
4 vCPU, 6,144 MB
Smallest plan
Lite

The scenario

Northwind Logistics has been given the block 172.16.10.0/24 for its new site. Router R1 serves two LANs (the HQ office and the warehouse), and a point-to-point link leads to R2, which stands in for the data centre (its loopback 2.2.2.2 is the "server"). You'll design the subnets, address everything, and use ARP and ICMP to troubleshoot until PC1 reaches the data centre.

Requirements (use as little address space as possible, largest subnet first):

SegmentHosts neededGateway
HQ office (R1 GE0/0/1, PC1)100first usable address
Warehouse (R1 GE0/0/2, PC2)50first usable address
R1–R2 link (GE0/0/0 on both)2R1 first usable, R2 second

The PCs are already addressed for the plan. Work out the plan yourself in Task 1 before you look at their addresses.

What you’ll practise

  • Subnet a block with VLSM and work out network, broadcast and host ranges by hand
  • Configure interface addresses with prefix lengths and dotted masks
  • Read the ARP table on a router and a host, and explain how ARP resolves a next hop
  • Use ping and tracert options, and interpret ICMP echo, unreachable and TTL-exceeded messages
  • Find and fix a missing return route

The tasks

  • Task 1: Design the plan
  • Task 2: Address the routers
  • Concept: ARP
  • Task 3: Watch ARP work
  • Concept: ICMP
  • Task 4: Reach the data-centre link
  • Task 5: Reach the "server"
  • Task 6: Ping options on VRP

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 IPv4 subnetting with ARP and ICMP4 nodes, 3 links. Every link is listed as text below the diagram.R1R2PC1PC2GE0/0/2eth0GE0/0/1eth0GE0/0/0GE0/0/0
4 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 GE0/0/1 to PC1 eth0
  • R1 GE0/0/2 to PC2 eth0
  • R1 GE0/0/0 to R2 GE0/0/0
Nodes in IPv4 subnetting with ARP and ICMP, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 MB
R2Huawei AR1000V routerhuaweiar1k-5.170-V300R022C00SPC100-Auto-update-esn1 vCPU, 2,048 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 HCIA-Datacom H12-811 guided labs.

  3. Open 02 - IPv4 subnetting with ARP and ICMP 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.

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