220-1101 Cheat Sheet

Key concepts

• ✓Connection types: cellular (4G/5G), Wi-Fi, Bluetooth, NFC, USB, hotspot.
• ✓Mobile OS management: MDM, MAM, corporate vs personal data separation.
• ✓Common symptoms: battery drain, overheating, connectivity, slow performance.
• ✓Synchronisation methods and data backup for iOS and Android.

Watch out for

• ⚠NFC requires very close proximity (a few centimetres) to function.
• ⚠Airplane mode disables cellular, Wi-Fi AND Bluetooth by default.
• ⚠MDM manages the whole device; MAM manages only the corporate apps.
• ⚠A factory reset solves software issues but wipes all user data.

Key concepts

• ✓Matching TCP and UDP ports to services such as SSH 22, DNS 53, HTTPS 443, RDP 3389
• ✓Distinguishing 802.11 wireless standards, frequencies, and 2.4 GHz versus 5 GHz channel behavior
• ✓Configuring IPv4 addressing, subnet masks, default gateways, DNS servers, and DHCP versus static assignment
• ✓Using ipconfig, ping, tracert, nslookup, netstat, and net use to diagnose connectivity faults

Watch out for

• ⚠Confusing TCP and UDP ports for the same service, such as DNS using both 53 TCP and 53 UDP depending on the query type.
• ⚠Mixing up 2.4 GHz and 5 GHz tradeoffs, assuming higher frequency always gives longer range instead of faster speeds with shorter reach.
• ⚠Forgetting APIPA 169.254.x.x means DHCP failed, then blaming DNS or the default gateway for the connectivity problem.

Key concepts

• ✓Match USB, Thunderbolt, Lightning, and RJ45 ports to laptop and mobile device functions
• ✓Differentiate DDR3, DDR4, DDR5, SODIMM, and ECC RAM by speed, voltage, and use case
• ✓Identify motherboard form factors (ATX, microATX, Mini-ITX) and header functions like front-panel connectors
• ✓Diagnose laser printer defects such as ghosting, smearing, and repeated marks by component

Watch out for

• ⚠Confusing Thunderbolt 3 with USB-C: both use the same connector, but only Thunderbolt carries PCIe and DisplayPort natively.
• ⚠Assuming all M.2 slots support NVMe; some are SATA-only, so a PCIe SSD won't be recognized in those slots.
• ⚠Mixing up DDR generations: DDR4 and DDR5 are keyed differently and cannot be installed in the same motherboard slot.

Key concepts

• ✓Distinguish IaaS, PaaS, and SaaS by which layer the provider manages versus the customer
• ✓Match public, private, hybrid, and community cloud models to given business scenarios
• ✓Identify client-side virtualization requirements: CPU virtualization extensions, RAM, and storage
• ✓Recognize cloud characteristics such as rapid elasticity, measured service, and resource pooling

Watch out for

• ⚠Confusing IaaS with PaaS: IaaS supplies raw compute, storage, and networking, while PaaS adds a managed runtime and development environment.
• ⚠Assuming any modern CPU supports virtualization without checking that VT-x or AMD-V is enabled in BIOS/UEFI.
• ⚠Treating hybrid cloud as identical to public cloud, ignoring that hybrid keeps some workloads on-premises or in a private cloud.

Key concepts

• ✓Diagnosing POST errors, boot failures and power supply symptoms.
• ✓Identifying failed storage, RAM or GPU components from observed symptoms.
• ✓Safe component handling: ESD precautions and proper tool use.
• ✓Printer troubleshooting: paper jams, print quality, connectivity.

Watch out for

• ⚠A POST beep code indicates a hardware failure before the OS loads.
• ⚠No display does not always mean a bad monitor — check GPU and cable first.
• ⚠SMART errors indicate storage health issues, not OS corruption.
• ⚠Capacitor bulge is a definitive sign of a failing motherboard or PSU.