CompTIA A+ Flashcards
What is VDI?
Virtual Desktop Infrastructure.
How many volts does do RAM slots typically use on a motherboard?
3.3v
How many volts to most common peripherals in PCIe slots use?
Other common motherboard components use 5v.
12v
What is the IMSI?
International mobile subscriber identity
The code that is put on a SIM card to uniquely identify it.
A WWAN is what kind of connection?
A wireless cellular connection. Sometimes found in laptops.
What is a PAN?
Personal Area Network.
Usually with Bluetooth.
What is SMTP for?
Sending emails
What are POP3 and IMAP for?
Retrieving emails.
Post office protocol 3
What are the network ports for POP3?
TCP port 110
SSL port 995
What port does ssl use?
Secure socket layer
TCP port 995
What can you do with POP3 protocol?
Download and (optionally) delete messages from the server, usually onto a single device.
What can you do with IMAP4?
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
SMTP ports?
TCP 25 TCP 587 (with auth)
How is S/MIME used?
For MS Exchange.
Secure, multipurpose internet mail exchange.
Allows encrypt and digitally sign.
FTP ports?
TCP 20 - active mode data
TCP 21 - control
File functions:
List, add, delete, etc.
Ssh common port?
TCP 22
Telnet port?
TCP 23
DNS common port?
UDP 53
Uses tcp 53 as a fallback.
What is RDP?
Remote Desktop protocol.
TCP 3389
What does windows use instead of FTP?
SMB (server message block), also called CIFS (common internet file system).
TCP 445
What does Apple use instead of FTP?
AFP (Apple filing protocol).
Uses SLP (service location protocol) to find locations/servers.
TCP 427 & UDP 427.
DHCP normal ports?
UDP 67 & 68.
What is LDAP?
Lightweight directory access protocol.
TCP 389
Used in Microsoft Active Directory.
What is SNMP?
Simple network management protocol.
Gathers statistics from network devices.
Queries: UDP 161
Traps/alarms: UDP 162
What enhancements does SNMP v3 offer?
Message integrity
Authentication
Encryption
Another name for a hub?
A multi port repeater.
Based on what do today’s switches (and previously hubs) pass on incoming traffic?
The destination MAC address.
What is an ASIC?
Application-specific integrated circuit.
A piece of hardware inside a switch (bridge) that forwards traffic based on data-link address.
What makes a switch a layer-3 switch?
It can route traffic based on the data-link address (layer 2) and the up address (layer 3).
What is a wireless LAN controller?
A device that controls many, even thousands, of WAPs (wireless access points) either with a physical device or in the cloud.
Firewalls typically run on what OSI layer?
Layer 3, because they are often built into routers.
Firewalls route traffic based on what OSI layer?
Layer 4, tcp/UDP.
What is DOCSIS?
Cable internet.
Data over cable service interface specification.
What does ADSL stand for?
Asymmetric digital subscriber line.
What type of connector do landline telephones and POTS services in computers use?
RJ11.
What is a Patch Panel?
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.
What does SOHO stand for?
A small-office home-office.
A SOHO router has many functions all in one.
What do EOP and PLC do?
EoP is Ethernet over Power and PLC is Power Line Communication. It’s a way of connecting to Ethernet using power cables.
Port Forwarding is also called what 2 things?
Destination NAT or Static NAT.
What is whitelisting?
No traffic can pass thru the firewall unless it’s specifically allowed.
What is blacklisting?
Nothing on the “bad list” is allowed.
What is the highest encryption method available (usually) for wireless channels?
WPA2
WPA2-AES
What is 802.11g?
Wireless standard made in 2003, backwards compatible with 802.11a and b and operates at 2.4Ghz.
What is 802.11n?
Wireless standard made in 2009.
2.4GHz or 5GHz.
Total throughout 600 Mbit/s
Faster because of using 4 MIMO (multiple input multiple output).
What is 802.11ac?
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.
What 802.11 channels are best to use to avoid overlapping?
Channels 1, 6, 11.
What is Zigbee?
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.
What is Z-wave?
Proprietary home automation networking.
A mesh network like Zigbee.
Uses ISM band at 900MHz.
What is a SIEM?
Security information and event management.
Used to consolidate logs.
What does WORM mean?
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.
What is an Endpoint Management System?
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.”
