The short version of everything I study — key commands and facts by topic, each linking to the full chapter notes.
Ultimate Cheatsheet
#networking
37 entries across collections.
Networking for Sysadmins ch. 3 — IPv4 addressing, subnets/netmasks, viewing config on Windows/Debian/FreeBSD, private addressing/NAT, and troubleshooting.
Resource Cheatsheet
Full class notes for Networking for Sysadmins ch. 3: IPv4 addressing, subnets/netmasks, viewing config on Windows/Debian/FreeBSD, private addressing and NAT, and troubleshooting.
Lesson Note
Professor Messer A+ 220-1201 objective 2.7 — satellite (GEO vs LEO), fibre, cable and DOCSIS, DSL, cellular tethering vs hotspot, and WISPs.
Resource Cheatsheet
Professor Messer A+ 220-1201 objective 2.8 — crimpers, Wi-Fi and spectrum analysers, tone generator and probe, punch-down tools, cable testers, loopback plugs, taps and SPAN.
Resource Cheatsheet
Full class notes for Professor Messer A+ 220-1201 objective 2.7: satellite (GEO vs LEO), fibre, cable and DOCSIS, DSL, cellular tethering and hotspots, and WISPs.
Lesson Note
Full class notes for Professor Messer A+ 220-1201 objective 2.8: crimpers, Wi-Fi and spectrum analysers, tone generator and probe, punch-down tools, cable testers, loopback plugs, taps and port mirrors.
Lesson Note
Professor Messer A+ 220-1201 section 2 — IP, TCP/UDP and ports, wireless, network services, DNS/DHCP/VLAN/VPN, devices, IP addressing, connection types and tools.
Resource Cheatsheet
Professor Messer A+ 220-1201 objective 2.5 — routers, managed vs unmanaged switches, access points, patch panels, firewalls, PoE standards, cable/DSL/ONT and NICs.
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Professor Messer A+ 220-1201 objective 2.6 — IPv4 octets and binary, RFC 1918 private ranges and NAT, IPv6 hex notation, shortening rules, address types and /64.
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Professor Messer A+ 220-1201 objective 2.6 — IP address, subnet mask and gateway; static vs dynamic vs DHCP reservation; APIPA range and its ARP check.
Resource Cheatsheet
Lucas, Networking for System Administrators (2nd ed.) ch. 1 — the four layers, encapsulation, what changes at each hop, and troubleshooting commands by layer.
Resource Cheatsheet
Lucas, Networking for System Administrators (2nd ed.) ch. 2 — interfaces, autonegotiation, MTU and DF ping, ARP and NDP, VLAN terms and datalink error counters.
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Pre Security module 5, What is Networking? — networks and the internet, private vs public, IP vs MAC addresses, MAC spoofing, IPv4 vs IPv6, and ping.
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Pre Security module 5, Intro to LAN — star, bus and ring topologies, switches vs hubs, routers, subnetting and address roles, ARP request/reply, and DHCP DORA.
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Pre Security module 5, OSI Model — the seven layers and what each does, addresses and devices per layer, TCP vs UDP, and encapsulation.
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Pre Security module 5, Packets & Frames — packet vs frame, IP and TCP headers, the three-way handshake and close, UDP, and port numbers and ranges.
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Pre Security module 5, Extending Your Network — port forwarding, stateful vs stateless firewalls, VPNs and VPN protocols, routers, layer 2 vs layer 3 switches, and VLANs.
Resource Cheatsheet
Full class notes for Professor Messer A+ 220-1201 objective 2.5: routers, managed and unmanaged switches, access points, firewalls, PoE and ISP devices.
Lesson Note
Full class notes for Professor Messer A+ 220-1201 objective 2.6: IPv4 structure and binary, RFC 1918 private ranges and NAT, IPv6 notation and /64 prefixes.
Lesson Note
Full class notes for Professor Messer A+ 220-1201 objective 2.6: IP address, subnet mask and gateway; static addressing vs DHCP reservations; APIPA.
Lesson Note
Full class notes for Lucas, Networking for System Administrators (2nd ed.) ch. 1: the four network layers, encapsulation and troubleshooting layer by layer.
Lesson Note
Full class notes for Lucas, Networking for System Administrators (2nd ed.) ch. 2: interfaces, autonegotiation, MTU, ARP and Neighbor Discovery, VLANs and datalink errors.
Lesson Note
Full class notes for TryHackMe Pre Security (2026 path) module 5, What is Networking?: networks and the internet, IP and MAC addresses, and ping.
Lesson Note
Full class notes for TryHackMe Pre Security (2026 path) module 5, Intro to LAN: star, bus and ring topologies, switches and routers, subnetting, ARP and DHCP.
Lesson Note
Full class notes for TryHackMe Pre Security (2026 path) module 5, OSI Model: the seven layers, what each one does, TCP versus UDP, and encapsulation.
Lesson Note
Full class notes for TryHackMe Pre Security (2026 path) module 5, Packets & Frames: packets vs frames, the TCP/IP model, TCP headers and the three-way handshake, UDP and ports.
Lesson Note
Full class notes for TryHackMe Pre Security (2026 path) module 5, Extending Your Network: port forwarding, stateful and stateless firewalls, VPNs, routers, switches and VLANs.
Lesson Note
Professor Messer A+ 220-1201 networking primer — encapsulation, TCP vs UDP, multiplexing, IP addresses, well-known vs ephemeral ports, reading a protocol decode.
Resource Cheatsheet
Professor Messer A+ 220-1201 objective 2.1 — FTP, SSH, Telnet, SMTP, DNS, DHCP, HTTP/HTTPS, POP3, IMAP, SMB/CIFS, NetBIOS, LDAP and RDP port numbers.
Resource Cheatsheet
Professor Messer A+ 220-1201 objective 2.2 — 802.11/Wi-Fi naming, frequency bands, channels and bandwidth, Bluetooth and ISM, RFID passive/active tags, and NFC.
Resource Cheatsheet
Professor Messer A+ 220-1201 objective 2.3 — DNS, DHCP, file/print sharing, email, syslog/SIEM, web, AAA, database, NTP, spam gateway, UTM, load balancer, proxy, SCADA/ICS, legacy, embedded and IoT.
Resource Cheatsheet
Professor Messer A+ 220-1201 objective 2.4 — DNS hierarchy and root servers, dig/nslookup, resource records, A/AAAA, CNAME, MX, TXT, DKIM, SPF and DMARC.
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Professor Messer A+ 220-1201 objective 2.4 — why DHCP exists, the DORA process with exact packet fields, scopes, pools and exclusions, and DHCP reservations.
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Professor Messer A+ 220-1201 objective 2.4 — broadcast domains, LANs, VLANs and inter-VLAN routing, VPN concentrators, client-to-site vs site-to-site VPN.
Resource Cheatsheet
Code ch. 28 — graphics, sound, networks, the internet and the web tying it all together, plus a look at where computing goes next.
Resource Cheatsheet
DNS, TCP, TLS and the first byte, in the order they actually occur
Explainer