Add lab-01-trace-request

lab-01-trace-request/portfolio-summary.md

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+# Lab 1: Trace the Request
+
+## What I practiced
+
+In this lab, I worked with a simple virtual Linux network and used networking tools to examine:
+
+- name resolution,
+- route selection,
+- next-hop addressing,
+- outgoing interface and source addressing,
+- and neighbor information.
+
+## Request trace
+
+In one or two sentences, explain how the client moves from `web.minicorp.test` to its next-hop device.
+
+> Replace this line with your explanation.
+
+## Key takeaway
+
+Explain why the client needs both an IP address and a link-layer address when sending traffic to the next hop.
+
+> Replace this line with your explanation.