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Showing 20 results for “CompTIA”. More results are available below.
A+ · Hardware
RAID 0 stripes data across drives for speed with zero redundancy; one failure loses everything. RAID 1 mirrors two drives, tolerating one failure at the cost of half the capacity. RAID 5 str…
A+ · Hardware
M.2 is a form factor, not an interface, so the notch on the card tells you what it speaks. M-key drives use up to four PCIe lanes and are NVMe SSDs, the fast option. B-key drives use SATA or…
A+ · Hardware
The laser imaging process runs in a fixed order. Processing builds the page image. Charging puts a uniform negative charge on the drum. Exposing uses the laser to draw the image by dischargi…
A+ · Networking
A+ expects the common port numbers cold. FTP uses 20 and 21, SSH and SFTP 22, Telnet 23, SMTP 25, DNS 53, DHCP 67 and 68, HTTP 80, POP3 110, NetBIOS 137 to 139, IMAP 143, SNMP 161 and 162, L…
A+ · Networking
An address starting 169.254 is APIPA, self-assigned when a client cannot reach a DHCP server; it can talk to other APIPA hosts on the same segment but not the internet, so the fix is to chec…
A+ · Networking
2.4 GHz penetrates walls best and reaches furthest but has only three non-overlapping channels (1, 6, 11) and shares the band with microwaves and Bluetooth, so it is slow and congested. 5 GH…
A+ · Mobile Devices
Most laptop screens are LCD panels that need a backlight, now LED, behind the liquid crystal layer. IPS panels give wide viewing angles and accurate colour, TN panels are cheaper and faster …
A+ · Mobile Devices
Mobile device management enrols phones and tablets so an organisation can push settings, require a passcode, enforce encryption, install apps and locate or wipe devices. In a bring-your-own-…
A+ · Mobile Devices
Phones and tablets carry several sensors that A+ expects you to match to symptoms. The accelerometer measures movement and triggers screen rotation; unwanted rotation or no rotation points h…
A+ · Virtualization and Cloud Computing
A Type 1 hypervisor installs directly on the hardware with no operating system underneath, as with VMware ESXi, Microsoft Hyper-V and KVM, and is used in data centres for performance and iso…
A+ · Virtualization and Cloud Computing
Infrastructure as a Service provides virtual machines, storage and networks you manage from the OS up. Platform as a Service provides a managed runtime or database so you deploy code without…
A+ · Virtualization and Cloud Computing
Virtual desktop infrastructure hosts user desktops as VMs on central servers, delivered to thin clients or any device over a remote display protocol; it centralises patching and data but dep…
A+ · Operating Systems
sfc /scannow verifies protected Windows system files and replaces corrupted ones from the component store. If SFC cannot repair because the store itself is damaged, run DISM /Online /Cleanup…
A+ · Operating Systems
FAT32 is universally readable but caps individual files at 4 GB and volumes at 32 GB when formatted by Windows, so a large ISO will not copy to it. exFAT removes those limits while staying c…
A+ · Operating Systems
A+ covers a survival set of Linux commands. ls lists files, cd changes directory, pwd prints where you are, cp, mv and rm copy, move and delete, and mkdir creates directories. cat shows a fi…
A+ · Security
WEP is broken and should never be used. WPA with TKIP is deprecated. WPA2 with AES-CCMP remains acceptable, and WPA3 is the current standard with stronger encryption, protection against offl…
A+ · Security
Social engineering attacks people rather than systems. Phishing is deceptive email; spear phishing targets a specific person; whaling targets executives; vishing uses voice calls and smishin…
A+ · Security
CompTIA's malware removal procedure has seven ordered steps. First, investigate and verify the malware symptoms. Second, quarantine the infected system by disconnecting it from the network. …
A+ · Troubleshooting
CompTIA's method is tested constantly. One: identify the problem by gathering information, questioning the user, identifying symptoms and changes, and backing up before making changes. Two: …
A+ · Troubleshooting
When a desktop powers on with spinning fans but no display and no beep codes, start by stripping to minimum: one RAM stick, CPU, motherboard, power supply, and onboard or a single graphics c…
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