--- title: "IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux" source_name: "freeCodeCamp.org" original_url: "https://www.youtube.com/watch?v=4m9j6hlbf4g" canonical_url: "https://www.traeai.com/articles/553144b3-baac-460d-83af-b51c0e85f172" content_type: "video" language: "中文" score: 6 tags: ["IT基础","freeCodeCamp","在线课程","云计算","DevOps"] published_at: "2026-04-28T14:38:54+00:00" created_at: "2026-05-01T01:03:45.395601+00:00" --- # IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux Canonical URL: https://www.traeai.com/articles/553144b3-baac-460d-83af-b51c0e85f172 Original source: https://www.youtube.com/watch?v=4m9j6hlbf4g ## Summary 免费课程介绍：涵盖IT基础，包括硬件、云、DevOps、网络、安全、数据库、DNS、Git和Linux。 ## Key Takeaways - 课程内容广泛，涉及IT多个基础领域。 - 由freeCodeCamp.org提供，适合初学者或希望系统学习IT基础的人员。 - 视频形式，包含多个相关主题的链接供进一步学习。 ## Content Title: IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux URL Source: http://www.youtube.com/watch?v=4m9j6hlbf4g Markdown Content: # IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux - YouTube Back [![Image 1](http://www.youtube.com/watch?v=4m9j6hlbf4g)](http://www.youtube.com/ "YouTube Home") Skip navigation Search Search with your voice [](http://www.youtube.com/watch?v=4m9j6hlbf4g) [Sign in](https://accounts.google.com/ServiceLogin?service=youtube&uilel=3&passive=true&continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26app%3Ddesktop%26hl%3Den%26next%3Dhttps%253A%252F%252Fwww.youtube.com%252Fwatch%253Fv%253D4m9j6hlbf4g&hl=en&ec=65620) [![Image 2](http://www.youtube.com/watch?v=4m9j6hlbf4g)](http://www.youtube.com/ "YouTube Home") [](http://www.youtube.com/watch?v=4m9j6hlbf4g) [](http://www.youtube.com/watch?v=4m9j6hlbf4g) [](http://www.youtube.com/watch?v=4m9j6hlbf4g) [](http://www.youtube.com/watch?v=4m9j6hlbf4g) [IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux](http://www.youtube.com/watch?v=4m9j6hlbf4g) [](http://www.youtube.com/watch?v=4m9j6hlbf4g) Tap to unmute 2x [![Image 3](http://www.youtube.com/watch?v=4m9j6hlbf4g)](http://www.youtube.com/watch?v=4m9j6hlbf4g) ## IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux freeCodeCamp.org 57,099 views 2 days ago [](http://www.youtube.com/watch?v=4m9j6hlbf4g) Search Copy link Info Shopping ![Image 4](http://www.youtube.com/watch?v=4m9j6hlbf4g) [![Image 5](http://www.youtube.com/watch?v=4m9j6hlbf4g)](http://www.youtube.com/watch?v=4m9j6hlbf4g) If playback doesn't begin shortly, try restarting your device. • You're signed out Videos you watch may be added to the TV's watch history and influence TV recommendations. 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More courses from Eissa Abousherif:…...more ...more Transcript Follow along using the transcript. Show transcript [![Image 8](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### freeCodeCamp.org 11.6M subscribers](http://www.youtube.com/@freecodecamp) [Videos](http://www.youtube.com/channel/UC8butISFwT-Wl7EV0hUK0BQ/videos)[About](http://www.youtube.com/channel/UC8butISFwT-Wl7EV0hUK0BQ/about) Show less [](http://www.youtube.com/watch?v=4m9j6hlbf4g) # IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux 57,099 views 57K views Apr 28, 2026 3.8K Share Save Download Download Shop the freeCodeCamp.org store [![Image 9](https://encrypted-tbn3.gstatic.com/shopping?q=tbn:ANd9GcQN91f-fyOu9GQgPRaDkKFHgrlcTumpmH7RVBNKX2Um272qtAIZtwEtmiSLkTDTJIu7Fyz3gbo) Men's T-shirt Black L $20.00 freecodecamp Represent the freeCodeCamp community. Available in all 50 US States. Free shipping. A vintage-black, triblend T-shirt, featuring the iconic “bonfire function call” logo. This rugged shirt is made of 25% cotton, 25% rayon, and 50% polyester, and it will withstand hundreds of washes without losing its snugness or color. All proceeds above cost will go toward improving freeCodeCamp. Shop freecodecamp](http://www.youtube.com/watch?v=4m9j6hlbf4g)[![Image 10](https://encrypted-tbn0.gstatic.com/shopping?q=tbn:ANd9GcSR5fnbG8Iqk7w78sm1VBw75gwy2Vv1r_Tzg04vDyekrhGIfRNECvR6IOaoXMCDRcavZDQxfOU) Women's T-shirt Black M $20.00 freecodecamp Represent the freeCodeCamp community. Available in all 50 US States. Free shipping. A charcoal-black, relaxed-fit triblend T-shirt, featuring the iconic “bonfire function call” logo. This rugged shirt is made of 25% cotton, 25% rayon, and 50% polyester, and it will withstand hundreds of washes without losing its snugness or color. All proceeds above cost will go toward improving freeCodeCamp. Shop freecodecamp](http://www.youtube.com/watch?v=4m9j6hlbf4g) ## 99 Comments Sort comments Sort by [Top Show featured comments](http://www.youtube.com/watch?v=4m9j6hlbf4g)[Newest Show recent comments, including potential spam](http://www.youtube.com/watch?v=4m9j6hlbf4g) ![Image 11: Default profile photo](https://yt3.ggpht.com/a/default-user=s48-c-k-c0x00ffffff-no-rj) Add a comment... ![Image 12](https://yt3.ggpht.com/ytc/AIdro_lVoVr5r5YL5uCtCco0bnlX_p0pa_TRdWOWlLtcrTFWQwU=s88-c-k-c0x00ffffff-no-rj) ### [@rahulnl6665](http://www.youtube.com/@rahulnl6665) [1 day ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgzjO6MufkDHNTAXgzx4AaABAg) IT Basics & Certifications: [0:00](http://www.youtube.com/watch?v=4m9j6hlbf4g) IT Roles (DevOps, SRE, Platform Engineering): [5:04](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=304s) Hardware (CPU, RAM, SSD, NICs): [7:58](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=478s) Software (OS, GUI vs. CLI, Apps): [17:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1033s) Windows vs. Linux & Open Source: [24:21](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1461s) Servers (Virtualization, Hypervisors): [32:00](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1920s&pp=0gcJCTAAlc8ueATH) AWS Account Setup & EC2 Launch: [50:31](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=3031s) Cloud Fundamentals (Data Centers, CapEx/OpEx): [1:07:37](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=4057s) Cloud Service Models (IaaS, PaaS, SaaS): [1:27:03](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=5223s) Cloud Providers (AWS, Azure, GCP): [1:36:56](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=5816s) Networking (LAN, WAN, CAN): [1:41:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=6065s) Networking Devices (Hubs, Switches, Routers): [1:52:45](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=6765s) Cabling & Data Center Networks: [2:05:40](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=7540s) Wireless (WLAN) & Internet Connectivity: [2:17:01](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=8221s) IP Addressing (IPv4, IPv6, Binary): [2:24:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=8645s) Network Portions, Subnets, & CIDR: [3:14:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=11645s) IP Classes & Subnetting: [3:41:53](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=13313s) Public/Private IPs, NAT, IANA: [4:10:18](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=15018s) Routing (Route Tables, BGP): [4:49:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=17345s) IP Packet Anatomy: [5:16:11](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=18971s) VPC (AWS Regions, AZs): [5:21:30](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=19290s) Lab: Custom VPC & Internet Gateway: [5:37:16](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=20236s) Public vs. Private Subnets & NAT: [6:11:22](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=22282s) OSI 7-Layer Model & Encapsulation: [6:40:41](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=24041s) TCP vs. UDP & Ports: [6:54:16](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=24856s) Protocols (ICMP, SSH, HTTP/HTTPS): [7:11:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=25873s) Security (Firewalls, DMZ): [7:44:00](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=27840s) Security Groups vs. NACLs: [8:00:23](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=28823s) Services (DNS, Monitoring, Logging): [8:14:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=29653s) Databases (Relational, NoSQL, SQL): [8:33:01](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=30781s) Tools (Linux, Bash, Python): [8:47:11](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=31631s) Architecture Design Masterclass: [9:07:42](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=32862s) Course Summary & Next Steps: [13:00:50](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=46850s) Show less Read more Like 67 Dislike Reply 2 replies Hide replies 2 replies ![Image 13](https://yt3.ggpht.com/9REMMm54Ec99AVg_4LqTqxRIxB7BQzjZt_njHpsjcZq_uu26j3qmQ99J3qYGS6b2xVVztCPBFQ=s88-c-k-c0x00ffffff-no-rj) ### [@MirMuniruzzaman](http://www.youtube.com/@MirMuniruzzaman) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=Ugyg7eCFDu9qKfGDLIh4AaABAg) I think I don't need any CSE university; this channel is enough to become a master in CSE. Show less Read more Like 95 Dislike Reply 6 replies Hide replies 6 replies ![Image 14](https://yt3.ggpht.com/ytc/AIdro_nF2ZOaO7gQEK-Bp-UloclC4mfAFjGmsQ6jraqAleaQZLQ=s88-c-k-c0x00ffffff-no-rj) ### [@mokhles8](http://www.youtube.com/@mokhles8) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgzAMFBachhcmcaUMhN4AaABAg) Egyption instructor![Image 15: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 16: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 17: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 18: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 30 Dislike Reply ![Image 19](https://yt3.ggpht.com/ytc/AIdro_lNHLFD9GH9Am-wlg92uPBMo65zdHSuReWW9hU5_oAHCalUtqEc2BnY4xdFNHLK1xI8tiMsOg=s88-c-k-c0x00ffffff-no-rj) ### [@psevdonim257](http://www.youtube.com/@psevdonim257) [2 days ago (edited)](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=Ugz3hU3lczoUVT8spet4AaABAg) I started watching your channel to learn English, now I am trying to find job as a programmer ![Image 20: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 4 Dislike Reply ![Image 21](https://yt3.ggpht.com/S8TN86o91VMbi1TScTf5jcfJ_c-sOzCLP9ph5C2MAGMsRyotx7Fdbcjon8b3qQQWCKELtVr50C8=s88-c-k-c0x00ffffff-no-rj) ### [@VOLTAGExMILIN](http://www.youtube.com/@VOLTAGExMILIN) [1 day ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgwR4bba0VjWJuPrbxR4AaABAg) # ![Image 22: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Overall Idea of the Video This course is a **complete IT → Networking → Cloud → DevOps foundation roadmap**. It teaches: * How computers work * How networks connect systems * How the internet functions * How AWS cloud infrastructure is built * How security and system design works ![Image 23: 👉](http://www.youtube.com/watch?v=4m9j6hlbf4g) Think of it as: *“How the internet + cloud systems actually run behind the scenes”* --- # ![Image 24: 🧱](http://www.youtube.com/watch?v=4m9j6hlbf4g) 1. IT Basics & Career Roles ![Image 25: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [00:00](http://www.youtube.com/watch?v=4m9j6hlbf4g) – [07:58](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=478s) ### ![Image 26: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * IT certifications: * A+ → Hardware & basics * Network+ → Networking fundamentals * CCNA → Cisco networking (advanced level) * Job roles: * DevOps Engineer → automates deployment * SRE → keeps systems reliable * Platform Engineer → builds internal infrastructure ### ![Image 27: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: You learn who does what in IT companies and what skills matter. --- # ![Image 28: 💻](http://www.youtube.com/watch?v=4m9j6hlbf4g) 2. Hardware & Software Basics ![Image 29: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [07:58](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=478s) – [24:21](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1461s) ### ![Image 30: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Hardware: * CPU = brain * RAM = short-term memory * SSD = storage * NIC = network connection ### ![Image 31: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Software: * OS = Windows/Linux manager * GUI = visual interface * CLI = command line (powerful for engineers) ### ![Image 32: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: Hardware runs software, OS connects user to machine. --- # ![Image 33: 🐧](http://www.youtube.com/watch?v=4m9j6hlbf4g) 3. Windows vs Linux ![Image 34: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [24:21](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1461s) – [32:00](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1920s) ### ![Image 35: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * Windows = user-friendly, GUI-based * Linux = server + DevOps standard * Open-source = free, customizable ### ![Image 36: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: ![Image 37: 👉](http://www.youtube.com/watch?v=4m9j6hlbf4g) Most servers in cloud run Linux, not Windows. --- # ![Image 38: ☁](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ 4. Servers & Virtualization ![Image 39: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [32:00](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1920s) – [50:31](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=3031s&pp=0gcJCTAAlc8ueATH) ### ![Image 40: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * Server = powerful computer running services * Virtualization = multiple virtual machines on one machine * Hypervisor: * Type 1 → runs directly on hardware (cloud servers) * Type 2 → runs on OS (VirtualBox, VMware) ### ![Image 41: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: Cloud is just **virtual machines running on big servers**. --- # ![Image 42: ☁](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ 5. AWS & Cloud Introduction ![Image 43: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [50:31](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=3031s) – [1:36:56](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=5816s) ### ![Image 44: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * AWS EC2 = virtual computer in cloud * Cloud setup replaces physical servers * Data centers = massive server farms * CapEx vs OpEx: * CapEx = buying hardware * OpEx = paying for usage (cloud) ### ![Image 45: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Cloud Models: * IaaS → rent servers (AWS EC2) * PaaS → platform to deploy apps * SaaS → ready apps (Gmail, Netflix) ### ![Image 46: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: Cloud = pay-as-you-use computing infrastructure. --- # ![Image 47: 🌐](http://www.youtube.com/watch?v=4m9j6hlbf4g) 6. Networking Fundamentals (VERY IMPORTANT) ![Image 48: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [1:41:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=6065s) – [2:17:01](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=8221s&pp=0gcJCTAAlc8ueATH) ### ![Image 49: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Concepts: * LAN = local network (home/office) * WAN = large network (internet) * Switch = connects devices inside LAN * Router = connects different networks * VLAN = virtual separation in networks ### ![Image 50: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Cabling: * UTP = copper cables * Fiber = faster long-distance ### ![Image 51: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: Networking = how devices talk to each other. --- # ![Image 52: 📡](http://www.youtube.com/watch?v=4m9j6hlbf4g) 7. Internet & IP Addressing ![Image 53: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [2:24:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=8645s) – [4:49:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=17345s) ### ![Image 54: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Core Concepts: * IPv4 vs IPv6 * Binary math = how IPs are calculated * Subnetting = dividing networks * CIDR = efficient IP allocation ### ![Image 55: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Public vs Private IP: * Private IP = internal network * Public IP = internet-accessible ### ![Image 56: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) NAT: * Allows multiple devices to share one public IP ### ![Image 57: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Routing: * Route tables decide traffic path * BGP = internet backbone routing protocol ### ![Image 58: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: ![Image 59: 👉](http://www.youtube.com/watch?v=4m9j6hlbf4g) This is how your message reaches a website. --- # ![Image 60: ☁](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ 8. AWS Networking (VPC) ![Image 61: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [5:21:30](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=19290s) – [6:40:41](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=24041s) ### ![Image 62: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * VPC = private network in AWS * Subnets: * Public subnet → internet access * Private subnet → internal only * Internet Gateway → connects AWS to internet * NAT → allows private subnet internet access ### ![Image 63: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Security: * OSI model = layers of networking * TCP vs UDP: * TCP = reliable * UDP = faster, no guarantee ### ![Image 64: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: ![Image 65: 👉](http://www.youtube.com/watch?v=4m9j6hlbf4g) AWS lets you build your own virtual internet. --- # ![Image 66: 🔐](http://www.youtube.com/watch?v=4m9j6hlbf4g) 9. Security + Protocols ![Image 67: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [7:11:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=25873s) – [8:14:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=29653s) ### ![Image 68: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * HTTP/HTTPS = web traffic * SSH = secure server login * ICMP = ping test ### ![Image 69: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Security: * Firewalls = traffic filter * Security Groups = AWS-level firewall (stateful) * NACLs = subnet firewall (stateless) * DMZ = isolated security zone ### ![Image 70: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: ![Image 71: 👉](http://www.youtube.com/watch?v=4m9j6hlbf4g) Security controls who can access what. --- # ![Image 72: 🧰](http://www.youtube.com/watch?v=4m9j6hlbf4g) 10. Services & Tools ![Image 73: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [8:14:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=29653s&pp=0gcJCTAAlc8ueATH) – [8:47:11](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=31631s) ### ![Image 74: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * DNS = converts domain → IP * Monitoring = system health tracking * Logging = event tracking * Databases: * SQL = structured data * NoSQL = flexible data * Linux + Bash = server control * Python = automation scripting ### ![Image 75: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: ![Image 76: 👉](http://www.youtube.com/watch?v=4m9j6hlbf4g) These tools run and automate modern systems. --- # ![Image 77: 🏗](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ 11. System Design & Architecture ![Image 78: ⏱](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ [9:07:42](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=32862s) – [13:00:50](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=46850s) ### ![Image 79: 📌](http://www.youtube.com/watch?v=4m9j6hlbf4g) Key Points: * Architecture diagrams = system blueprint * Shows how services connect * Helps design scalable systems ### ![Image 80: 🧠](http://www.youtube.com/watch?v=4m9j6hlbf4g) Meaning: ![Image 81: 👉](http://www.youtube.com/watch?v=4m9j6hlbf4g) This is “thinking like an engineer”, not just using tools. --- # ![Image 82: 🎯](http://www.youtube.com/watch?v=4m9j6hlbf4g) FINAL SUMMARY (SUPER IMPORTANT) This video teaches 5 big pillars: ### 1. Computers CPU, RAM, OS, Linux basics ### 2. Networking IP, DNS, routing, internet flow ### 3. Cloud (AWS) EC2, VPC, subnets, cloud design ### 4. Security Firewalls, authentication, encryption basics ### 5. DevOps mindset Automation, Linux, scripting, system design Show less Read more Like 11 Dislike Reply 2 replies Hide replies 2 replies ![Image 83](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@OmranMosa](http://www.youtube.com/@OmranMosa) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgwSFX7-b9AS0vITkhJ4AaABAg) هندسة حاسبات - 4 سنوات بكلوريوس اختصرها هنا ب 13 ساعة ![Image 84: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 85: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 86: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 87: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 88: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 89: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 90: 😂](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 16 Dislike Reply ![Image 91](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@ramadanmohamed9511](http://www.youtube.com/@ramadanmohamed9511) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgzNh1v1QPvRuJ6f5Rl4AaABAg) فخر مصر 🇪🇬 وأفريقيا اللى رافع راسنا. بالتوفيق. Show less Read more Like 13 Dislike Reply 1 reply Hide replies 1 reply ![Image 92](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@Eng.Mohammed.Eshinnawy](http://www.youtube.com/@Eng.Mohammed.Eshinnawy) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=Ugx4So1VUO5GyNjgx0x4AaABAg) حبيبنا باشمهندس عيسى المحترم افضل من يشرح المجال ![Image 93: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 94: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 95: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 5 Dislike Reply ![Image 96](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@SayedMahmoud-mv2yi](http://www.youtube.com/@SayedMahmoud-mv2yi) [13 hours ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgxMFK56PL04oGHs1sx4AaABAg) بشمهندس عيسي عاش![Image 97: 🔥](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 98: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)️ Show less Read more Like 1 Dislike Reply ![Image 99](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@mohamedelezmazy4345](http://www.youtube.com/@mohamedelezmazy4345) [1 day ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=Ugxr3NEzCJ-go-1OJ9h4AaABAg) فخر العرب ![Image 100: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 101: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 3 Dislike Reply ![Image 102](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@sedosadat4174](http://www.youtube.com/@sedosadat4174) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgwxBCQgBD_XCtpLDBt4AaABAg&pp=0gcJCSIANpG00pGi) ياااه مبسوط بيك ياهندسة بجد ![Image 103: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g)![Image 104: 🎉](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 8 Dislike Reply ![Image 105](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@sauravsharma7677](http://www.youtube.com/@sauravsharma7677) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgwmB9K6ITjTyrJlWtZ4AaABAg) First of its kind, very much required Show less Read more Like 12 Dislike Reply ![Image 106](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@TPkarov](http://www.youtube.com/@TPkarov) [12 hours ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgyfjEbtj1RyrvDOt4F4AaABAg) I wish i got a credit card to register and learn AWS ... Show less Read more Like 2 Dislike Reply ![Image 107](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@Jaber_Dev](http://www.youtube.com/@Jaber_Dev) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=Ugz_POHYajDFWvpj0_94AaABAg) عاش يا هندسة ![Image 108: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 4 Dislike Reply ![Image 109](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@alyanhabib-h4p](http://www.youtube.com/@alyanhabib-h4p) [1 day ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgzrBdpWnPFdgC5qHQl4AaABAg) هندسه عيسي انا مشترك معه في الكورس واحد من اعظم المهندسين Show less Read more Like Dislike Reply ![Image 110](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@ahmedabdelshafy7582](http://www.youtube.com/@ahmedabdelshafy7582) [1 day ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgxKLPWv84pdOYMCTMN4AaABAg) Thank you for your great efforts ![Image 111: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like Dislike Reply ![Image 112](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@mohamedhashem7372](http://www.youtube.com/@mohamedhashem7372) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgzxO7578mLn00XCsgd4AaABAg) هندسه الي مشرفنا ![Image 113: ❤](http://www.youtube.com/watch?v=4m9j6hlbf4g) Show less Read more Like 3 Dislike Reply ![Image 114](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@Thehighskies](http://www.youtube.com/@Thehighskies) [1 day ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=Ugxj1Uoox48FqZHBRbR4AaABAg) Thank you Eissa Abousherif, this is what I was looking for. This is going to be a game changer for me. Thanks to everyone who made it available, I have deep respect for your service. Show less Read more Like Dislike Reply ![Image 115](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@Dmitriy163-89](http://www.youtube.com/@Dmitriy163-89) [2 days ago](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=UgxjWPRmL5mfSiZ9h0N4AaABAg) Yes, these are the requirements for the entry level position of a web developer in 2026 Show less Read more Like 30 Dislike Reply 2 replies Hide replies 2 replies ![Image 116](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [@centipedekid9824](http://www.youtube.com/@centipedekid9824) [2 days ago (edited)](http://www.youtube.com/watch?v=4m9j6hlbf4g&lc=Ugzk3axdw134xz3UULp4AaABAg) How's the job market? Cause it sounds like this guy traded IT for teaching it. Which isn't the same. Job market isn't the same as 30 years ago. Show less Read more Like 3 Dislike Reply ## Comments 99 [Top Show featured comments](http://www.youtube.com/watch?v=4m9j6hlbf4g)[Newest Show recent comments, including potential spam](http://www.youtube.com/watch?v=4m9j6hlbf4g) ## In this video Transcript ## Products freeCodeCamp.org tagged products below.[Learn more](http://www.youtube.com/watch?v=4m9j6hlbf4g) [![Image 117](http://www.youtube.com/watch?v=4m9j6hlbf4g) #### Men's T-shirt Black L freecodecamp $20.00 View](http://www.youtube.com/watch?v=4m9j6hlbf4g) [![Image 118](http://www.youtube.com/watch?v=4m9j6hlbf4g) #### Women's T-shirt Black M freecodecamp $20.00 View](http://www.youtube.com/watch?v=4m9j6hlbf4g) ## Description IT Fundamentals Course – Hardware, Cloud, DevOps, Networking, Security, Databases, DNS, Git, Linux 3.8K Likes 57,099 Views Apr 28 2026 This course provides a solid foundation to start building your technical skills and understanding of modern IT concepts. More courses from Eissa Abousherif: [https://www.udemy.com/user/dolfined/](https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbkRpdlQ1NHBQRktoNDhITGNIazN4MjFFSFY3Z3xBQ3Jtc0tuZ0tnR0Rmb2NPdGR1Z3ZJMFVBVzA2VW5aMkVWTVhnMzZSNlZrVnkzdVgxYk5sSnp4MG05UmZBd29iekNkM2tiWTRKUW1JVFpzRkdnbUFtNTFIMi0ybkJlQ0t6cXlyVnlKSXdMdGdNNld1UmNMS2VzSQ&q=https%3A%2F%2Fwww.udemy.com%2Fuser%2Fdolfined%2F&v=4m9j6hlbf4g) ❤️ Support for this channel comes from our friends at Scrimba – the coding platform that's reinvented interactive learning: [https://scrimba.com/freecodecamp](https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqa1JSWVVpQjk4b1ZUTGt6bkltR1pXZzFUb0VRd3xBQ3Jtc0tsbEVjS0dxSGFuYnFzeDlYUmRUcDZXYXY0TkNmN3hDb2l6b3ZhZmNJbm1QRG95bjh0SGdkVENhWF81REFOSWZ5RjlFOUl0MGt6OXhFTTVTT2NXZ0JXSEoydGVfbHJMbDFNWUZwVDl4dlpNcE1HZkdtNA&q=https%3A%2F%2Fscrimba.com%2Ffreecodecamp&v=4m9j6hlbf4g) Contents * [00:00](http://www.youtube.com/watch?v=4m9j6hlbf4g) IT Basics & Certifications (A+, Net+, CCNA) * [05:04](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=304s) IT Roles: DevOps, SRE, & Platform Engineering * [07:58](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=478s) Hardware: CPU, RAM, SSD, & NICs * [17:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1033s) Software: OS, GUI vs. CLI, & Application Types * [24:21](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1461s) Windows vs. Linux & Open Source * [32:00](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=1920s) Servers: Virtualization, Hypervisors, & Type 1 vs. 2 * [50:31](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=3031s) AWS Account Setup & EC2 VM Launch * [1:07:37](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=4057s) Cloud: Data Centers, CapEx vs. OpEx, & Benefits * [1:27:03](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=5223s) Service Models (IaaS, PaaS, SaaS) & Cloud Deployment * [1:36:56](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=5816s) Choosing Providers: AWS, Azure, & GCP * [1:41:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=6065s) Networking: LAN, WAN, CAN, & Traffic Flows * [1:52:45](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=6765s) Devices: Hubs, Switches, VLANs, & Routers * [2:05:40](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=7540s) Cabling (UTP vs. Fiber) & Data Center Networks (DCN) * [2:17:01](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=8221s) Wireless (WLAN) & How the Internet Connects * [2:24:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=8645s) IP Addressing: IPv4 vs. IPv6 & Binary Math * [3:14:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=11645s) Network Portions, Subnet Masks, & CIDR Notation * [3:41:53](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=13313s) IP Classes & Subnetting (Pizza Analogy) * [4:10:18](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=15018s) Public vs. Private IPs, NAT, & IANA Hierarchy * [4:49:05](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=17345s) Routing: Route Tables, BGP, & Default Routes * [5:16:11](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=18971s) IP Packet Anatomy: Headers vs. Payload * [5:21:30](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=19290s) VPC: AWS Regions, AZs, & Virtual Data Centers * [5:37:16](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=20236s) Lab: Creating a Custom VPC & Internet Gateway * [6:11:22](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=22282s) Public vs. Private Subnets & NAT Configuration * [6:40:41](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=24041s) Models: OSI 7-Layer Reference & Encapsulation * [6:54:16](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=24856s) TCP vs. UDP & Common Port Allocations * [7:11:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=25873s) Protocols: ICMP (Ping), SSH, & HTTP/HTTPS * [7:44:00](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=27840s) Security: Firewalls, Zoning, & DMZ Architectures * [8:00:23](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=28823s) Security Groups (Stateful) vs. NACLs (Stateless) * [8:14:13](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=29653s) Services: DNS, Monitoring, Alerting, & Logging * [8:33:01](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=30781s) Databases: Relational, NoSQL, & SQL Queries * [8:47:11](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=31631s) Tools: Linux Skills, Bash Scripting, & Python * [9:07:42](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=32862s) Design: Professional Architecture Diagram Masterclass * [13:00:50](http://www.youtube.com/watch?v=4m9j6hlbf4g&t=46850s) Course Summary & Next Steps …...more ...more Show less Transcript Follow along using the transcript. Show transcript [![Image 119](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### freeCodeCamp.org 11.6M subscribers](http://www.youtube.com/@freecodecamp) [Videos](http://www.youtube.com/channel/UC8butISFwT-Wl7EV0hUK0BQ/videos)[About](http://www.youtube.com/channel/UC8butISFwT-Wl7EV0hUK0BQ/about) ## Transcript NaN / NaN [![Image 120](https://i.ytimg.com/vi/-QFHIoCo-Ko/hqdefault.jpg?sqp=-oaymwEmCKgBEF5IWvKriqkDGQgBFQAAiEIYAdgBAeIBCggYEAIYBjgBQAE=&rs=AOn4CLAjqfhVXCym1J3M1Q5FFsmLv37FBg) 1:36:30](http://www.youtube.com/watch?v=-QFHIoCo-Ko&pp=ugUEEgJlbtIHCQnfCgGHKiGM7w%3D%3D) ![Image 121](http://www.youtube.com/watch?v=4m9j6hlbf4g) ![Image 122](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [Full Walkthrough: Workflow for AI Coding — Matt Pocock](http://www.youtube.com/watch?v=-QFHIoCo-Ko&pp=ugUEEgJlbtIHCQnfCgGHKiGM7w%3D%3D) AI Engineer and Matt Pocock 253K views • 6 days ago New [![Image 123](https://i.ytimg.com/vi/OpcuqePIL7k/hqdefault.jpg?sqp=-oaymwEmCKgBEF5IWvKriqkDGQgBFQAAiEIYAdgBAeIBCggYEAIYBjgBQAE=&rs=AOn4CLCFACZGyghUGxZ6BGoRmLNTPGKX5Q) 17:36](http://www.youtube.com/watch?v=OpcuqePIL7k) ![Image 124](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [Why Adam Savage Won't Trust USB Keys](http://www.youtube.com/watch?v=OpcuqePIL7k) Adam Savage’s Tested 854K views • 1 month ago [![Image 125](https://i.ytimg.com/vi/96jN2OCOfLs/hqdefault.jpg?sqp=-oaymwEmCKgBEF5IWvKriqkDGQgBFQAAiEIYAdgBAeIBCggYEAIYBjgBQAE=&rs=AOn4CLBZdp1cX62GE_0F_7p8NNyecd0HIQ) 29:49](http://www.youtube.com/watch?v=96jN2OCOfLs&pp=ugUEEgJlbg%3D%3D) ![Image 126](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [Andrej Karpathy: From Vibe Coding to Agentic Engineering](http://www.youtube.com/watch?v=96jN2OCOfLs&pp=ugUEEgJlbg%3D%3D) Sequoia Capital 281K views • 1 day ago New [![Image 127](https://i.ytimg.com/vi/xj_GjnD4uyI/hqdefault.jpg?sqp=-oaymwEmCKgBEF5IWvKriqkDGQgBFQAAiEIYAdgBAeIBCggYEAIYBjgBQAE=&rs=AOn4CLCBNlFiPHgg0tK8qos0Cy9fsnBPsw) 23:21](http://www.youtube.com/watch?v=xj_GjnD4uyI) ![Image 128](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [Every Networking Concept Explained In 20 Minutes](http://www.youtube.com/watch?v=xj_GjnD4uyI) TechWorld with Nana 502K views • 4 months ago [![Image 129](https://i.ytimg.com/vi/0NGdHSvRH9M/hqdefault.jpg?sqp=-oaymwEmCKgBEF5IWvKriqkDGQgBFQAAiEIYAdgBAeIBCggYEAIYBjgBQAE=&rs=AOn4CLA_BPo3xlWML2ErYANAncr95mLj8Q) 11:16](http://www.youtube.com/watch?v=0NGdHSvRH9M&pp=ugUEEgJlbtIHCQnfCgGHKiGM7w%3D%3D) ![Image 130](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [LINUS TORVALDS WAS RIGHT ABOUT MICROSOFT BUT NOBODY LISTENED....](http://www.youtube.com/watch?v=0NGdHSvRH9M&pp=ugUEEgJlbtIHCQnfCgGHKiGM7w%3D%3D) Innovation Uncovered 30K views • 11 hours ago New [![Image 131](https://i.ytimg.com/vi/RCbJKkG_mZs/hqdefault.jpg?sqp=-oaymwEmCKgBEF5IWvKriqkDGQgBFQAAiEIYAdgBAeIBCggYEAIYBjgBQAE=&rs=AOn4CLDUIAJCk4KmfdOzH1D-dbgZIZ0ZKA) 2:18:44](http://www.youtube.com/watch?v=RCbJKkG_mZs&pp=0gcJCd8KAYcqIYzv) ![Image 132](http://www.youtube.com/watch?v=4m9j6hlbf4g) ### [Google Invests $40B Into Anthropic, GPT 5.5 Drops, and Google Cloud Dominates | EP #252](http://www.youtube.com/watch?v=RCbJKkG_mZs&pp=0gcJCd8KAYcqIYzv) Peter H. 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