Study guide · Topic overview
A subject-based path for the ideas behind everyday networks and cloud platforms: addresses and ports, the devices that move traffic, how names become IP addresses, and who manages what in IaaS, PaaS, and SaaS.
Scope notice: Networking & Cloud Fundamentals is an independent study topic, not CompTIA Network+, Cloud+, CCNA, or a vendor cloud exam. The domains below organize foundational skills. Items tagged Extra sit outside that everyday set. Port numbers, private ranges, and cloud models match the facts used in the CompTIA A+ networking notes.
A network moves data between hosts. An address says where a host lives, a port says which program should receive the message, and a name such as www.example.com has to be translated into an address before anything is sent. Cloud computing rents those same ideas: virtual networks, virtual machines, storage, and applications, billed by use and scaled with demand.
This path stays at the foundation. You should be able to explain why a laptop shows 169.254.x.x, which port HTTPS uses, why channels 1, 6, and 11 matter on 2.4 GHz, and why the customer still patches the operating system on an IaaS virtual machine.
These weights organize the notes, flashcards, and 200 practice questions. They are not official exam weights.
Where a packet is going, and which program should receive it.
The boxes and the air that carry the frames.
How a host gets an address and a name, and what to test first.
What you rent, and what still runs on virtual hardware.
Who locks the door after the provider builds the building.
Memorize the ranges and ports you will see in troubleshooting. The same facts are in the core notes and flashcards.
| Item | Value | Remember |
|---|---|---|
| Private IPv4 | 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 | Not routed on the public internet. 172.16.0.0/12 is 172.16 through 172.31. |
| APIPA | 169.254.0.0/16 | The host could not get a DHCP lease. |
| Loopback | 127.0.0.1 and ::1 | The host talking to itself. |
| IPv6 link-local | fe80::/10 | Used on the local link, similar in purpose to APIPA. |
| IPv6 global unicast | 2000::/3 | Publicly routable IPv6 space. |
| /24 | Mask 255.255.255.0, 254 usable hosts | Usable hosts are 2(32 − prefix) − 2. |
| SSH / HTTP / HTTPS | TCP 22 / 80 / 443 | 22 and 443 are encrypted. 80 is not. |
| DNS / DHCP | 53 / UDP 67 and 68 | DNS also uses TCP for large replies and zone transfers. |
| SMTP / IMAP / POP3 | TCP 25 / 143 / 110 | SMTP sends mail. IMAP leaves it on the server. POP3 usually downloads it. |
| SMB / RDP / LDAP | TCP 445 / 3389 / 389 | File sharing, graphical remote desktop, and directory queries. |
Ask two questions: who operates the stack, and who else shares the infrastructure. Examples are illustrations, not a requirement to use that vendor.
| Model | Customer still manages | Concrete picture |
|---|---|---|
| IaaS | Operating system, middleware, applications, and data | A virtual machine you patch yourself |
| PaaS | Applications and data | A runtime where you deploy code, not the OS |
| SaaS | Settings, user accounts, and data | Microsoft 365, Google Workspace, or Salesforce |
| Public | Your configuration and data on shared provider hardware | Multitenant infrastructure over the internet |
| Private | Often more of the stack, dedicated to one organization | Single-tenant cloud, on premises or hosted |
| Hybrid | Both sides, plus the link between them | Public and private connected, often by VPN |
The ideas are testable from the notes. A small lab makes them stick.
On your own machine, find the IPv4 address, mask, default gateway, and DNS servers. Decide whether the address is private, APIPA, or public before you renew a lease.
If a name fails and the IP address works, start with DNS. If the default gateway does not answer, start with the local link, the address, or the DHCP lease.
For any service, say what the provider operates and what you still configure. A virtual machine and a mailbox do not have the same patching job.
A practical sequence if IP addresses and cloud names still blur together.
Private ranges, APIPA, loopback, and a /24 mask. If you cannot say why 169.254.12.8 is a DHCP clue, stay here.
SSH, HTTP, HTTPS, DNS, DHCP, SMTP, IMAP, SMB, and RDP. Say whether the traffic is encrypted by default.
A switch forwards by MAC address. A router forwards between IP networks. An access point attaches wireless clients. Then add Wi-Fi bands and channels 1, 6, and 11.
Gateway versus public IP versus hostname. Pair that with DHCP DORA and the A, AAAA, CNAME, and MX records.
Use the flashcards for IaaS, PaaS, SaaS, regions versus availability zones, and who is responsible for data and access.
Work through original questions, review every explanation, and return to the notes on domains below 75%.
The overview, core notes, flashcards, and practice exams are all published.
Scope, domains, address and port map, cloud models, and a study plan.
Reference notes for layers, addresses, ports, devices, Wi-Fi, DNS, DHCP, and cloud models.
40 recall cards in four decks, plus memory notes for ports, ranges, and service models.
200 original questions with custom exams, explanations, and a score report by domain.
No. This is a subject-based learning path for everyday networking and cloud ideas. It is not CompTIA Network+, Cloud+, CCNA, or AWS Cloud Practitioner, and it does not award a credential.
The notes stay vendor-neutral. Examples name common services only to make a model concrete, such as a virtual machine for IaaS or Microsoft 365 for SaaS. Console steps differ by provider.
No. The pages explain the ideas and include practice questions. A free-tier account is optional if you want to click through a console. Do not put real data in a practice account.
Items tagged Extra are useful context that sits outside the everyday set this path emphasizes, such as Wi-Fi 7 or legacy ports like TFTP.
Scores are unofficial percentages. There is no scaled 100-900 score because this is not a named certification exam. Domains below 75% are marked as focus areas.
Address plans, Wi-Fi rules, and cloud console names change. Confirm current behavior with the network you administer and the provider you use.
Useful companions while you study.
Generate strong random passwords with custom length, characters, symbols, and security options.
Encode text and files to Base64 or decode Base64 data with UTF-8 support.
Convert structured data between JSON and YAML with formatting and validation.
Compare two text blocks and highlight added, removed, and changed content.
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