WGU D316 (EASY STUDY) Comptia A+ 220-1201 complete questions with expert solutions + rationales

storage area network (SAN)

pool of storage devices for servers to use.

isolated from the main network.

can only be accessed by servers, not clients

port replicator

an external device for laptops that provides connections to ports like keyboard,monitor,mice, network devices.

shared resources

hardware or data made available over a network for multiple users/computers.

what causes mobile battery to swell?

-Faulty Charging circuit

POP3

-Post Office Protocol 3 uses TCP port 110. but 995 encrypted.

-It retrieves email messages from server mailbox.

IMAP4

-Internet Mail Access protocol uses TCP 143. but 993 is encrypted.

-Reads and manages mail messages. (delete, archive)

SMTP

-Simple Mail Transfer Protocol

- Port 25 (legacy)

- Sends /Relays email from client

-Only job is outgoing (no storing)

RDP uses what port?

TCP port 3389

DHCP

UDP 67, 68

SMB

- Used by Windows

- Also called CIFS (Common Internet File system)

- File Sharing, Printer Sharing

NetBIOS

- UDP 137 (name service)

- TCP 139 (session service)

If printer paper faded, what should they check?

Toner Cartridge

What port is Direct SMB communication over TCP without NetBIOS transport?

tcp 445

LDAP port?

TCP 389/636

BSOD causes

- Faulty drivers

- Corrupt files

- Defective hardware

- Overheating / PS issues

Copper Cables

- Rj45 connectors

- Rj122 connectors ( used in telephone)

Type 1 vs Type 2 Hypervisor

Type 1: Directly on hardware, more secure and faster.

Type 2: On an OS. Laptop/PC use this.

What is PCIe x1 used for?

-WiFi Cards

-Sound Cards

-USB expansion

What is PCIe x4 used for?

-NVMe SSDs

-Network Cards

-Capture cards

What is PCIe x8 used for?

-Mainly in servers

-RAID cards

- 40/100 GB network cards

What is PCIe x16 used for?

- Graphic Cards (GPU)

VGA vs DVI

- DVI = Digital

- VGA = Analog

-DVI supports higher resolution and sharper

- VGA has blue connector, DVI has white

- Both DO NOT carry audio

RAID 0 and RAID 1

- RAID 0 stripes with no parity ( if fails, all fails)

- RAID 1 mirroring. exact copies on both drives.

-striping means it sends data blocks to both drives.

RAID 5 and RAID 10

- RAID 5 stripes with parity. atleast 3 drives.

- can survive one disk fail. Data rebuilds using other drives information/data.

-RAID 10 stripes of mirrors. atleast 4 drives.

- all 4 drives are mirrored( exact copy).

- expensive but fast and best fail tolerance.

RAID 6

- Striping + double parity. Minimum 4 drives

- Like RAID 5, Rebuilds using other drives data/information

-can lost two drives instead of one.

-Common in servers for large arrays

- Literally RAID 5 with an extra dead drive allowed (2).

SD types

SDHC

SDHCX

UHS

SD Express

SMP and CMP

-Symmetric Multiprocessing

-Chip-level multiprocessing

Remember:

CMP is the physical part of multiprocessing, its up to SMP to read it and execute it

Proxy Server

-Filters, Caching

-Hide IP

- Bypass restrictions

- Monitor web traffic

ARM

- SoC that controls video,sound, network,etc as part of the CPU

- Used in apple, and most android mobile, and chromebook. sometimes on windows.

Trouble with laser printer, the light from the laser is not shining on that part of the printer. what part has a photosensitive surface?

A: Transfer roller

B: Toner

C: Developer roller

D: Imaging drum

Answer: Imaging Drum

- Its the charging stage of the printer. its round rotating cylinder conditioned by the PCR

Incorrect Answers:

A: Transfer Roller- applies positive charge to the underside of paper.

B: Toner - charged with high negative and applies to drum.

C: Developer roller - close to the photosensitive drum. carries the same negative charge as the drum

SCADA (supervisory control and data acquisition)

control systems used to monitor/control chemical, energy, logistics

DKIM (domainKeys identified mail)

authentication method that uses encryption to verify the domain name of an email's sender.

SPF

Sender Policy Framework

- List of servers authorized to send email for this domain

DMARC

Domain-based Message Authentication, Reporting, and Conformance

- Prevent unauthorized email use (spoof)

-Extension of SPF and DKIM

Copper Connectors

RJ11:

- Telephone/DSL connection

RJ45:

- Modular/Ethernet connection

F-connector:

- Coax Cable

- Cable TV/Modem

-DOCSIS

Punchdown block:

- Wires are 'punched' into the block

Copper Connectors (continued)

USB:

- USB A/B/C

- Mini/Micro plug

Molex Connector:

- 4 pin

- Powers Storage devices and fans

Lighting:

- Apple devices

- Higher output to mobiles over micro

DB-9 ( D- subminiature):

- Used for RS-232

- Built for modem comms, printer,mouse,network

- Used nowadays for config port

Fiber connectors

- ST (straight tip)

- SC (subscriber connector) used in data centers

- LC (Lucent connector)

Parity Memory vs Error Correction Code (ECC)

Parity:

- won't always detect an error

-cant correct error

ECC:

- Detects and corrects on the fly

- Not all systems use ECC

CPU to RAM throughput

ATX vs microATX vs ITX. What are its uses and details?

ATX:

-Modern 24 connector

microATX:

- Same standards as ATX just smaller and more limited

mini ITX:

- screw compatible with ATX cases

- for single purpose( only stream media, etc)

What connects to pin headers?

- Speakers

- Power buttons

- USB

HSM vs TPM

TPM: Trusted Platform Module

- Single system

- Links key to computer, also root of trust.

HSM: Hardware Security Module

- Often used in server cluster

- Key backup for many systems

- Also use light HSMs like USB

-Protect Certificate Authority (CA) key

What does 12V, 5V, and 3.3V power?

+12V:

-PCIe adapters, hard drive, cool fan

-12V:

- Integrated LAN, old port, some PCI

5V:

- some components

- Now use +3.3V

3.3V:

- M.2 , RAM, Motherboard circuits

SCP

SNMP

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