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Computer > CompTIA A+ > Flashcards

CompTIA A+ Flashcards

1
Q

What is VDI?

A

Virtual Desktop Infrastructure.

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2
Q

How many volts does do RAM slots typically use on a motherboard?

A

3.3v

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3
Q

How many volts to most common peripherals in PCIe slots use?

Other common motherboard components use 5v.

A

12v

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4
Q

What is the IMSI?

A

International mobile subscriber identity

The code that is put on a SIM card to uniquely identify it.

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5
Q

A WWAN is what kind of connection?

A

A wireless cellular connection. Sometimes found in laptops.

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6
Q

What is a PAN?

A

Personal Area Network.

Usually with Bluetooth.

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7
Q

What is SMTP for?

A

Sending emails

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8
Q

What are POP3 and IMAP for?

A

Retrieving emails.

Post office protocol 3

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9
Q

What are the network ports for POP3?

A

TCP port 110

SSL port 995

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10
Q

What port does ssl use?

A

Secure socket layer

TCP port 995

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11
Q

What can you do with POP3 protocol?

A

Download and (optionally) delete messages from the server, usually onto a single device.

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12
Q

What can you do with IMAP4?

A

Internet message access protocol.

Access mail on a central server.
Supports folders and server-side searching.

To configure:
Name of imap server.
Username and password.

Network ports:
TCP 143
IMAP ssl 993

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13
Q

SMTP ports?

A 
TCP 25
TCP 587 (with auth)
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14
Q

How is S/MIME used?

A

For MS Exchange.
Secure, multipurpose internet mail exchange.
Allows encrypt and digitally sign.

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15
Q

FTP ports?

A

TCP 20 - active mode data
TCP 21 - control

File functions:
List, add, delete, etc.

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16
Q

Ssh common port?

A

TCP 22

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17
Q

Telnet port?

A

TCP 23

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18
Q

DNS common port?

A

UDP 53

Uses tcp 53 as a fallback.

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19
Q

What is RDP?

A

Remote Desktop protocol.

TCP 3389

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20
Q

What does windows use instead of FTP?

A

SMB (server message block), also called CIFS (common internet file system).

TCP 445

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21
Q

What does Apple use instead of FTP?

A

AFP (Apple filing protocol).

Uses SLP (service location protocol) to find locations/servers.

TCP 427 & UDP 427.

22
Q

DHCP normal ports?

A

UDP 67 & 68.

23
Q

What is LDAP?

A

Lightweight directory access protocol.

TCP 389

Used in Microsoft Active Directory.

24
Q

What is SNMP?

A

Simple network management protocol.

Gathers statistics from network devices.

Queries: UDP 161
Traps/alarms: UDP 162

25
Q

What enhancements does SNMP v3 offer?

A

Message integrity
Authentication
Encryption

26
Q

Another name for a hub?

A

A multi port repeater.

27
Q

Based on what do today’s switches (and previously hubs) pass on incoming traffic?

A

The destination MAC address.

28
Q

What is an ASIC?

A

Application-specific integrated circuit.

A piece of hardware inside a switch (bridge) that forwards traffic based on data-link address.

29
Q

What makes a switch a layer-3 switch?

A

It can route traffic based on the data-link address (layer 2) and the up address (layer 3).

30
Q

What is a wireless LAN controller?

A

A device that controls many, even thousands, of WAPs (wireless access points) either with a physical device or in the cloud.

31
Q

Firewalls typically run on what OSI layer?

A

Layer 3, because they are often built into routers.

32
Q

Firewalls route traffic based on what OSI layer?

A

Layer 4, tcp/UDP.

33
Q

What is DOCSIS?

A

Cable internet.

Data over cable service interface specification.

34
Q

What does ADSL stand for?

A

Asymmetric digital subscriber line.

35
Q

What type of connector do landline telephones and POTS services in computers use?

A

RJ11.

36
Q

What is a Patch Panel?

A

A panel of RJ45 Ethernet connections that are run from all the computers in an office into a closet where they can then be connected to whatever switch necessary by running another cable from the patch panel to the desired switch.

37
Q

What does SOHO stand for?

A

A small-office home-office.

A SOHO router has many functions all in one.

38
Q

What do EOP and PLC do?

A

EoP is Ethernet over Power and PLC is Power Line Communication. It’s a way of connecting to Ethernet using power cables.

39
Q

Port Forwarding is also called what 2 things?

A

Destination NAT or Static NAT.

40
Q

What is whitelisting?

A

No traffic can pass thru the firewall unless it’s specifically allowed.

41
Q

What is blacklisting?

A

Nothing on the “bad list” is allowed.

42
Q

What is the highest encryption method available (usually) for wireless channels?

A

WPA2

WPA2-AES

43
Q

What is 802.11g?

A

Wireless standard made in 2003, backwards compatible with 802.11a and b and operates at 2.4Ghz.

44
Q

What is 802.11n?

A

Wireless standard made in 2009.
2.4GHz or 5GHz.
Total throughout 600 Mbit/s
Faster because of using 4 MIMO (multiple input multiple output).

45
Q

What is 802.11ac?

A

Made in 2014, much bigger frequency range than 802.11n, and only operates at 5GHz.

8 separate MIMO streams at the same time (called MU-MIMO, multiple user MIMO).

Total maximum throughput almost 7 Gbit/s.

46
Q

What 802.11 channels are best to use to avoid overlapping?

A

Channels 1, 6, 11.

47
Q

What is Zigbee?

A

An open standard IEEE 802.15.4 PAN (personal area network, like Bluetooth).

Longer distance than Bluetooth, less power than WiFi.

A mesh network, don’t need one centralized device.

Communicates over the ISM band (industrial, scientific and medical band) at 900MHz and 2.4GHz.

48
Q

What is Z-wave?

A

Proprietary home automation networking.

A mesh network like Zigbee.

Uses ISM band at 900MHz.

49
Q

What is a SIEM?

A

Security information and event management.

Used to consolidate logs.

50
Q

What does WORM mean?

A

Write once, read many.

Used for storing security/info logs, such as on a hard drive, it’s written once, but cannot be written again.

51
Q

What is an Endpoint Management System?

A

Manage all devices from one pane of glass.
- software, drivers, updates, patches, etc.

Install a client onto each computer/hardware you’re tracking and monitor all from “one pane of glass.”

Computer (11 decks)

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