CompTIA A+ 220-1101 Core 1 Study Flashcards Part 3

- IP address assigned by DHCP server.
- This method insures there are no overlapping IP addresses within a network.
- Changes when lease expires
(2.5)

- A node that handles communication between its LAN and other networks.
(2.5)

- 13 root server clusters (Over 1,000 actual servers)
- 100's of Generic Top Level Domains (gTLD)
- Over 275 Country-Code Top-Level Domains (ccTLD)
(2.6)

- A records are for IPv4 addresses
- AAAA records are for IPv6 addresses
(2.6)

- Determines host name for mail server
(2.6)

- Can be used for verification purposes
- Commonly used for email security
- External email servers validate info from your DNS.
(2.6)

- 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)

- Created by the DHCP server to allow a system requesting an IP to use that IP for a certain amount of time.
(2.6)

- 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)

- The predefined range of addresses that can be leased to any network device on a particular network.
(2.6)

- Separated logically instead of physically
- Multiple domains under one physical switch
(2.6)

- Concentrator
- Encryption/Decryption access device
- Actively encrypts & decrypts your data packets
(2.6)

- Non-terrestrial communication
- 50 Mbit/s down, 3 Mbit/s up
- High latency (250 ms up/down)
- High frequencies (2 GHz)
(2.7)

- 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)

- Broadband (Transmission across many multiple frequencies)
- Data on "cable" network
- DOCSIS
- High Speed (50-1000 Mbit/s)
(2.7)

- ADSL (Assymetrical Digital Subscriber Line)
- 200 Mb down and 20 Mb up is common
(2.7)

- Separates land into "cells" and each cell covers a different frequency
- Tethering (Turn your phone into a router)
- Mobile Hotspot
(2.7)

- Wireless Internet Service Provider
- Connects rural/remote locations
- Need an outdoor antenna to connect typically
(2.7)

- Generally connects LANs across a distance
- Many different technologies
- Point-to-point Serial, MPLS, etc.
(2.7)

- A network covering a city
- Bigger than LAN, usually smaller than WAN
- Common to see government ownership
(2.7)

- Looks & feels like a local storage device
- Requires high bandwidth
- Some people may use an isolated network solely for the SAN
(2.7)

- A self-contained network of two or more computers connected using a wireless connection.
- Usually within a building
(2.7)

- "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)

- Everyone "hears" everything
- Specializes in 802.11 analysis
- Identify errors and interference
- Validate antenna location and installation
(2.8)

- 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)