Exercise 1: Naming Which Chapter Explains Each Unexplained Term — Possible Solution
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Three examples from the chapter's own "Gap This Course Fills" section:

1. ssh1's "How SSH Works" chapter -- connecting to a "host" over a
"port" without explaining what a port is.

Explained in: net1-8 (Ports & Sockets). Per the chapter's own roadmap
table, "Port -- The specific 'door' on a machine a connection is
aimed at -- Fully explained in net1-8." ssh1 uses port 22 as a given
fact throughout its own material; net1-8 is where the concept of a
port itself -- why connections need one, how well-known ports like 22
get assigned -- actually gets built from scratch.

2. https1 -- covering the TLS handshake without explaining the TCP
handshake it rides on top of.

Explained in: net1-7 (TCP vs. UDP). Per the chapter's own roadmap
table, "TCP handshake -- The setup exchange that establishes a
reliable connection -- Fully explained in net1-7." https1's own TLS
handshake material assumes a reliable, already-established connection
exists to build the encrypted session on top of; net1-7 is where that
underlying TCP handshake itself gets explained.

3. vpn1 -- talking about routing traffic through a tunnel without
explaining what routing normally does.

Explained in: net1-6 (Routing Basics). Per the chapter's own roadmap
table, "Routing / default gateway -- How a packet finds its way to a
destination on another network -- Fully explained in net1-6." vpn1's
own tunnel material assumes the reader already understands normal,
non-tunneled routing as a baseline to contrast the tunnel against;
net1-6 is where that baseline actually gets taught.

WHY THIS WORKS AS AN ANSWER
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This selects three distinct examples straight from the chapter's own
list, matches each to the specific upcoming chapter named in the
chapter's own roadmap table (not a guess), and explains briefly why
that specific chapter is the right match for that specific gap.