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CompTIA A+ 220-1101 Core 1 Study Flashcards 2025 Update., Exams of Computer Science

University of OxfordComputer Science

CompTIA A+ 220-1101 Core 1 Study Flashcards 2025 Update.CompTIA A+ 220-1101 Core 1 Study Flashcards 2025 Update.

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2024/2025

Available from 03/22/2025

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CompTIA A+ 220-1101 Core 1 Study
Flashcards 2025 Update.
Local Area Network (LAN) - Correct answer A network that covers
a relatively small area such as a building or group of buildings
(1.1 & 2.7)
Personal Area Network (PAN) - Correct answer - Provides
communication for devices owned by a single user that work over
a short distance
- Bluetooth, IR, NFC, etc.
(1.1 & 2.7)
LCD (Liquid Crystal Display) - Correct answer Lightweight &
Inexpensive - Poor black levels due to Separate Backlight
(1.2)
TN (twisted nematic) - Correct answer Fast response Times - Low
cost - Low Power Use - Limited Viewing Angles
(1.2)
IPS (In Plane Switching) - Correct answer Better Colors - Better
Viewing Angles - More Expensive
(1.2)
OLED (organic light-emitting diode) - Correct answer Thinner &
Brighter - No Need for Backlight
(1.2)
MDM (mobile device management) - Correct answer - Manage
company & user devices
- Centralized management system
- Ensures device security
(1.4)
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Download CompTIA A+ 220-1101 Core 1 Study Flashcards 2025 Update. and more Exams Computer Science in PDF only on Docsity!

CompTIA A+ 220-1101 Core 1 Study

Flashcards 2025 Update.

Local Area Network (LAN) - Correct answer A network that covers a relatively small area such as a building or group of buildings (1.1 & 2.7) Personal Area Network (PAN) - Correct answer - Provides communication for devices owned by a single user that work over a short distance

  • Bluetooth, IR, NFC, etc. (1.1 & 2.7) LCD (Liquid Crystal Display) - Correct answer Lightweight & Inexpensive - Poor black levels due to Separate Backlight (1.2) TN (twisted nematic) - Correct answer Fast response Times - Low cost - Low Power Use - Limited Viewing Angles (1.2) IPS (In Plane Switching) - Correct answer Better Colors - Better Viewing Angles - More Expensive (1.2) OLED (organic light-emitting diode) - Correct answer Thinner & Brighter - No Need for Backlight (1.2) MDM (mobile device management) - Correct answer - Manage company & user devices
  • Centralized management system
  • Ensures device security (1.4)

MAM (mobile application management) - Correct answer - Set policies & restrictions on apps

  • Control Company software (Update, Remove, Etc.) (1.4) PRL (Preferred Roaming List) - Correct answer - Allows phone to connect to the right tower (1.4) Port 20/21 - Correct answer FTP (File Transfer Protocol)
  • 20(TCP) for Data Transfers
  • 21(TCP) to Control Data Transfers (2.1) Port 22 - Correct answer SSH (Secure Shell) - TCP
  • Encrypted Communication
  • Looks/Acts the same as Telnet (2.1) Port 23 - Correct answer Telnet (Telecommunications Network) - TCP
  • Non-encrypted Communication
  • Log into devices remotely (2.1) Port 25 - Correct answer SMTP (Simple Mail Transfer Protocol) - TCP
  • Used to send mail from device to mail server (2.1) Port 53 - Correct answer DNS (Domain Name System) - UDP
  • Converts names to IP addresses
  • CRITICAL Resource (2.1)

Port 443 - Correct answer HTTPS (Hyper Text Transfer Protocol Secure) - TCP

  • Encrypted Communication in the Browser (2.1) Port 445 - Correct answer Server Message Block (SMB) & Common Internet File System (CIFS) - TCP
  • Provides direct connection & communication over TCP without the NetBIOS Transport (2.1) Port 3389 - Correct answer RDP (Remote Desktop Protocol) - TCP
  • Share a desktop from a remote location (2.1) Access Point - Correct answer Extends wired network & converts it into a wireless network. (2.2) Router - Correct answer Routes traffic between IP subnets (2.2) Patch Panel - Correct answer - Goes between work desks & switches
  • Work desk connections to patch panel are permanent. (2.2) Firewalls - Correct answer -Filters traffic by TCP/UDP port number (OSI Layer 4 filtering) -Some can filter based on the application -Can encrypt traffic in/out of the network (protect traffic between sites) -Can proxy traffic (common security technique) -Can be used as a Layer 3 device (routers)

PoE (Power over Ethernet) - Correct answer Devices that send Ethernet data and power over twisted-pair cable to compliant devices (for example, cameras, phones, etc). (2.2) Modem - Correct answer - Cable Version: Uses DOCSIS (Data over Cable Service Interface Specification) which is broadband.

  • DSL Version: Uses ADSL (Asymmetrical Digital Subscriber Line) where download speed is higher than upload speed. (2.2) ONT (optical network terminal) - Correct answer - Fiber
  • ISP fiber line stretches to demarc point at which your in-home copper wire takes over. (2.2) NIC (Network Interface Card) - Correct answer - A device that serves as an interface between the computer and the network. Also called a network adapter or network card.
  • Ethernet Connection
  • May need drivers installed before hardware is installed (Check Manual) (2.2) 802.11 Types - Correct answer a (10/1999) - 5Ghz & 54 mbit/s b (10/1999) - 2.4 Ghz & 11 mbit/s g (06/2003) - 2.4 Ghz & 54 mbit/s n (10/2009) - 2.4/5 Ghz & 600 mbit/s ac (01/2014) - 5 Ghz & Almost 7 Gb/s ax (02/2021) - 2.4/5 Ghz & About 9.6 Gb/s (2.3)

Web Server - Correct answer - A server that delivers requested webpages to your computer or mobile device

  • Uses HTTPS/HTTPS & HTML/HTML
  • Web pages are stored on the server (2.4) Authentication Server - Correct answer - A server that keeps track of who's logging on to the network and which services on the network are available to each user.
  • Redundant Server (Always Available) (2.4) Spam Gateway - Correct answer - Checks for Unsolicited Emails
  • Scans incoming mail to accept or reject it. (2.4) UTM Gateway (Unified Threat Management Gateway) - Correct answer Services:
  • URL Filter / Content Inspection
  • Firewall - Malware Inspection
  • Spam Filter - VPN Endpoint
  • IDP / IPS (2.4) Load Balancer - Correct answer - A dedicated network device that can direct requests to different servers based on a variety of factors.
  • Distributes load to multiple servers
  • Server outages have no effect
  • TCP & SSL Offload (2.4) Proxy Server - Correct answer - A server that acts as an intermediary between a user and the Internet.
  • Access control, URL Filtering, Content Scanning

SCADA / ICS (Supervisory Control and Data Acquisition / Industrial Control System) - Correct answer - Large-scale

  • PC Manages Equipment
  • Requires extensive segmentation
    • Usually expensive software, requires elevated permission to access. (2.4) IoT (Internet of Things) - Correct answer - Appliances such as fridges & microwaves
  • Air control (Smart Thermostats)
  • Access Devices (Smart doorbells and locks) (2.4) IPv4 - Correct answer - The dominant protocol for routing traffic on the Internet
  • 4 Numbers (X.X.X.X)
    • 32 bits or 4 bytes -> 8 bits per number
    • Max value for each number is 255 (2.5) IPv6 (Internet Protocol version 6) - Correct answer - 8 hexadecimals (X.X.X.X.X.X.X.X)
  • 128 bits or 16 bytes -> 16 bits per number APIPA (Automatic Private IP Addressing) - Correct answer - Link Local addresses (no router forwarding)
  • IETF has reserved 169.254.0.0 - 169.254.255.
  • Only communicates on your network (2.5)

Spam Management - Correct answer - Domain Keys Identified Mail (DKIM)

  • Digitally sign a domains outgoing mail
  • Public key is available in DKIM TXT record
  • Sender Policy Framework (SPF)
  • List of all servers authorized to send emails on behalf of this domain; prevents email spoofing
  • Mail server validates mail is coming from authorized host
  • Domain-based Message Authentication, Reporting, & Conformance (DMARC)
  • Extension of DKIM / SPF
  • Decides what servers do with mail that isn't accepted by SPF/DKIM (2.6) Lease - Correct answer - Created by the DHCP server to allow a system requesting an IP to use that IP for a certain amount of time. (2.6) Reservation - Correct answer - An IP address that is set aside by a DHCP server for a specific network client, which is identified by its MAC address. (2.6) Scope - Correct answer - The predefined range of addresses that can be leased to any network device on a particular network. (2.6) VLAN (Virtual Local Area Network) - Correct answer - Separated logically instead of physically
  • Multiple domains under one physical switch (2.6) VPN (Virtual Private Network) - Correct answer - Concentrator
    • Encryption/Decryption access device
    • Actively encrypts & decrypts your data packets (2.6) Satellite Networking - Correct answer - Non-terrestrial communication
  • 50 Mbit/s down, 3 Mbit/s up
  • High latency (250 ms up/down)
  • High frequencies (2 GHz) (2.7) Fiber Newtwork - Correct answer - High Speed Communication
  • Higher install costs vs copper wire
  • Large installation in the WAN core
    • Supports high data rates
    • SONET, Wavelength Division Multiplexing (2.7) Cable - Correct answer - Broadband (Transmission across many multiple frequencies)
  • Data on "cable" network
    • DOCSIS
  • High Speed (50-1000 Mbit/s) (2.7) DSL - Correct answer - ADSL (Assymetrical Digital Subscriber Line)
  • 200 Mb down and 20 Mb up is common (2.7)

Cable Crimpers - Correct answer - "Pinch" the connector onto a wire

  • Coaxial, twisted pair, fiber
  • Connect the modular connector to the Ethernet cable
  • Metal prongs are pushed through the insulation (2.8) WiFi Analyzer - Correct answer - Everyone "hears" everything
  • Specializes in 802.11 analysis
  • Identify errors and interference
  • Validate antenna location and installation (2.8) Tone Generator / Probe - Correct answer - Tone generator
  • Sends an analog sound through the cable it is attached to
  • Probe
  • Makes noise and/or lights up when touching the cable with the generator attached
  • Easy wire tracing (2.8) Punch Down Tool - Correct answer - A pointed tool used to insert twisted-pair wire into receptors in a punch-down block
  • Organization is key
  • Maintain twists in cables (2.8) Cable Testers - Correct answer - Continuity test
  • Can identify missing pins or crossed wires
  • Not usually used for frequency testing (2.8) Loopback Plug - Correct answer - Useful for testing physical ports
  • Serial, Ethernet, T1, fiber
  • Data leaves the interface, loops back, and reenters

Taps & Port Mirrors - Correct answer - Used to intercept network traffic

  • Physical Taps
    • Disconnect link & put tap in the middle
    • Active or Passive Tap
  • Port Mirror
    • Software based tap
    • SPAN (Switched Port ANalyzer)
    • Limited Functionality (2.8) Cat 5 & Cat 5e (enhanced) - Correct answer - Cable used to connect a network infrastructure
  • 1000Base-T Ethernet Standard
  • Work up to 100 meters (3.1) Cat 6 & Cat 6a (Augmented) - Correct answer - Use 10GBase-T Ethernet Standard
  • Unshielded Cat 6 works up to 55 meters
  • Shielded Cat 6 and Cat 6a work up to 100 meters (3.1) Coaxial - Correct answer - Single copper wire cable surrounded in layers
  • Uses RG-6 connector
  • Commonly used in TV's and High-Speed internet over cable (3.1) STP (Shielded Twisted Pair) - Correct answer - A type of cable containing twisted-wire pairs that are not only individually insulated, but also surrounded by a shielding.
  • Many organizations typically use T568B (3.1) USB 2.0 - Correct answer - HighSpeed: 480 megabits per second
  • 5 meters max length (3.1) USB 3.0 - Correct answer - SuperSpeed: 5 gigabits per second
  • 3 meters (No specified Length) (3.1) Serial (Console Cable) - Correct answer - Used to configure telephone and networking equipment
  • Commonly used for RS- (3.1) Thunderbolt Cable - Correct answer - High-speed serial connector
  • Thunderbolt v -20 Gbit/s aggregated channels -Mini DisplayPort connector
  • Thunderbolt v -40 Gbit/s aggregated throughput -USB-C connector
    • 3 meters w/ copper, 60 meters w/ optical (3.1) HDMI (High-Definition Multimedia Interface) - Correct answer - Digital audio and video interface
  • 19-pin type a connector
  • Around a 20 meter range (3.1) DisplayPort - Correct answer - Digital video connector in packetized form
  • Carries audio and video
  • Compatible with HDMI & DVI (With an adapter) (3.1) DVI (Digital Visual Interface) - Correct answer - Single & Dual link video
    • Single = 3.7 GB/s &. Dual = 7.4 GB/s
  • DVI-A (Analog)
  • DVI-D (Digital)
  • DVI-I (Integrated) - Analog and Digital (3.1) VGA (Video Graphics Array) - Correct answer -DB-15 connector (Also known as DE-15) -Blue color -Analog signal (No digital option) -Image degrades after 5 to 10 meters (3.1) SATA (Serial Advanced Technology Attachment) - Correct answer
  • Uses serial signals to transfer data
  • SATA 3.0 (6 GB/s)
  • SATA 3.2 (16 GB/s) SCSI (Small Computer System Interface) - Correct answer - Designed to string up to 16 devices on one cable
  • LUN (Logical Unit) are defined within each SCSI ID
  • SAS (Serial Attached SCSI) devices have no jumpers, terminators, or settings
  • SCSI pronounced "scuzzy" (3.1) eSATA (External SATA) - Correct answer - A modern type of connector for attaching external hard disks (3.1)
  • Uses a 1.25 mm furrule, half the size of the ST. (3.1) Punch down Block - Correct answer - A panel of data receptors into which twisted pair wire is inserted, or punched down, to complete a circuit. (3.1) microUSB - Correct answer - Smaller than a standard USB and used usually for mobile devices to charge and pass information. (3.1) miniUSB - Correct answer - This connector is used by portable electronic devices, such as digital cameras and some portable storage devices. (3.1) USB-C - Correct answer - 24 pin double sided USB connector
  • Smaller than regular USB connector
  • Used for USB, Thunderbolt, etc. (3.1) Molex Connector - Correct answer - 4 pin power connector used by optical drives, hard drives, and case fans
  • Keyed to prevent it from being inserted into a port improperly.
  • Provides +12V and +5V (3.1) Lightning Port - Correct answer - The proprietary Apple connector used on Apple iPhones, iPods, and iPads for power and communication (3.1)

DB-9 Connector - Correct answer - A type of connector with nine pins that's used in serial communication and conforms to the RS- 232 standard.

  • Built for modem communication
  • Now used as a configuration port (3.1) Virtual RAM - Correct answer - Swap File
  • Swap unused app data to storage to free up RAM (3.2) SODIMM (Small Outline Dual Inline Memory) - Correct answer - Used in laptops
  • Smaller form factor (3.2) DDR3 Memory - Correct answer - Max 16GB per DIMM
  • Twice the data rate as previous gen (3.2) DDR4 Memory - Correct answer - Max 64GB per DIMM
  • Speed increases over previous generation (3.2) DDR5 Memory - Correct answer - Faster Data Travel between memory and motherboard
  • Still max 64GB per DIMM (3.2) ECC (error-correcting code) RAM - Correct answer - Data detects and corrects errors on the fly
  • Looks identical to non-ECC memory (3.2)