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CompTIA Terminology > Network Theories > Flashcards

Network Theories Flashcards

1
Q

Network

A

A systems ability to connect, share and communicate with other systems.

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2
Q

Types of Networks

A

PAN - Personal Area Network
LAN - Local Area Network
WLAN - Wireless Local Area Network
MAN - Metropolitan Area Network
WAN - Wide Area Network
SAN - Storage Area Network

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3
Q

Ethernet Standards

A

Cat 5 - 100Mbps @ 100m
Cat 5e - 1Gbps @ 100m
Cat 6 - 1Gbps @ 100m
Cat 6 - 10Gbps @ 50m
Cat 6A - 10Gbps @ 100m

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4
Q

SOHO

A

Small Office/ Home Office is a network using single internet appliances as access points (Ethernet Switch, Internet Router)

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5
Q

Unshielded Twisted Pair (UTP)

A

Most common type of ethernet cable with 4 twisted pairs of wires that carry equal signals.
- easily workable
- protection against Crosstalk & EMI

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6
Q

Shielded Twisted Pair (STP)

A

Each twisted copper pair is covered in a conductive metal foil to protect against Crosstalk and EMI. metal foil makes cable harder to work with

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7
Q

Plenum Cables

A

An Ethernet cables that is graded to be used in ventilation ducts, which does not produce any harmful gases when heated.
- PVC jacket
- fire rated cable
- not flexible

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8
Q

Patch Panel

A

A pass through devices where network cables form a computer gets hard wired into the back of the devices and then rewired from the front into a switch

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9
Q

Switch

A

a device that connects other devices together on a network
- forwards data based in data link address (MAC)
- up to 48 ports
- can provide Power over Ethernet (PoE)

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10
Q

Fiber Optic

A

A cable that sends data via light to prevent interference and signal attenuation

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11
Q

Single Mode Fiber (SMF)

A
  • Long range (100Km)
  • small core = long wavelength
  • more expensive than MMF
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12
Q

Multi-Mode Fiber (MMF)

A
  • Short range (2Km)
  • Larger core = shorter wavelength
  • Less expensive than SMF
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13
Q

Coaxial Cable

A

Used for carrying cable TV signals as well as broadband cable internet
-Copper cable (No twisted pair)
- Protection against EMI

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14
Q

Network Interface Card (NIC)

A

A built in component of a motherboard or an expansion card used to connect the system to a network

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15
Q

Unmanaged Switch

A
  • works without configuration
  • used in SOHO
  • 4 or 8 ports
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16
Q

Managed Switch

A
  • Used in large corporate networks
  • Traffic prioritization
  • Redundancy support
  • Port Mirroring
  • Simple Network Management Protocol (SNMP)
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17
Q

Power over Ethernet (PoE)

A

A switch cable of sending power to a device on a network via an ethernet cable Cat 5 or better
- PoE = 15.4W
- PoE+ = 25.5W
- PoE++ = 71.3W

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18
Q

MAC Address

A

Media Access Control
- the physical address of a device on a network
- unique 48-bit identifier code

19
Q

802.11n (Wi-fi 4)

A
  • 5GHz or 2.4 GHz
  • 600Mbps
  • 4x MIMO (Multiple-Input Multiple-Output
20
Q

802.11ac (Wi-Fi 5)

A
  • 5GHz
  • 7Gbps
  • 8x DL MU-MIMO (Download Multiple user MIMO)
21
Q

802.11ax (Wi-Fi6)

A
  • 5GHz or 2.4GHz
  • 1.2 - 9.6Gbps
  • 8x DL & UL MU-MIMO (DL & Upload MU-MIMO)
22
Q

Wireless Frequencies

A

2.4GHz
- Longer wavelength = long distance & able to moves through solids easily
- Limited amount of channels = more congestion
- Slower data rate
5GHz
- Shorter wavelength = shorter distance & difficulty moving through solids
- more channels = less congested
- Higher data rate

23
Q

Wireless Channels

A

2.4GHz
- 30-45m
- 14 overlapping channels (1, 6, 11)
5GHz
- 30m
- 23 non-overlapping channels

24
Q

Wireless Network Types

A

Basic Service Set (BSS)
- A network with a singular access point
Extended Service Set (ESS)
- A network with multiple access points
BSSID
- MAC address for the access point of a BSS

25
Q

Public IP Address

A

Is the IP address that the ISP assigns to a network via a router that allows the network to access the internet

26
Q

Private IP Address

A

The physical address of a device’s NIC in a network that is assigned by DNS.
Private IP range:
10.0.0.0
172.16.0.0
192.168.0.0

27
Q

NAT

A

Network Access Translator
A part of a router that translates a devices private IP address into a public IP address, so that the device can access the internet.

28
Q

TCP/IP

A

Is a protocol suite that specifies how devices exchange data over a network, by breaking down how the data will be:
- Broken down
- Addressed
- Transmitted
- Routed
- Received

29
Q

TCP/IP Layers

A

1 Application Layer
- Provides applications with standardised data exchange (HTTPs = web browsing, FTP = file transfer from server to a PC)
2 Transport Layer
- Responsible for maintaining end to end communications across the network
3 Internet Layer
- Connects independent networks to transport packets across the network
4 Network Link Layer
- The components that connects hosts on the network (ethernet, router)

30
Q

ISP

A

Internet Service Provider
- Provides the gateway for a network to access the internet
- ISPs administers IP address to all routers

31
Q

TCP or UDP

A

Protocols used to transport data across a network
TCP (Transmission Control Protocol)
- connected orientated
- Secured Communication
- data transmission verification
- Reorder out of order data transmission
- Flow Rate control over of data transmission
UDP (User Data Protocol)
- connectionless
- Fast communication (live )
- No data transmission verification
- No flow rate Control of data transmission

32
Q

DNS

A

Domain Name Server
A server that fetches IP address for webpages

33
Q

IPv4

A

Primary IP address protocol used to communicate on an network
- 4 numbers separated with a period:
= 192.168.1.131
-Can be translated into binary with 8 bits = 1 byte = 1 octet:
= 11000000. 10101000. 00000001. 10000011

34
Q

IPv6

A

Newer form of IPv4 that has 340undecillion IP address eg: fe80:0000:0000:0000:5d18:0652:cffd:8f52
- 128bits = 16bytes total
- Consists of 8 groups with 2 bytes = 2 octets
- Hexadecimal (0-9 a-f)
- first 64bits = network IP address (public)
- last 64bits = Host IP address (private)

35
Q

Satellite Internet Connection

A

Communicates with devices via satellites
- Expensive
- High latency 250ms
- Line of sight required

36
Q

Fiber Internet connection

A
  • more expensive than copper
    -High bandwidth
  • long distances
37
Q

Cable Broadband

A

Copper wire that transmits different frequencies for different types of data
DOCSIS
-Data Over Cable Service Interface Specification
- high speed
DSL / ADSL
- Digital Subscriber Line
- Asymmetric DSL
- different upload and download speeds
- uses telephone lines

38
Q

Cellular Internet Connections

A

Cellar Networks
- data being sent over mobile phones that are connected via tethering/ hotspot

39
Q

WISP

A

Wireless Service provider
- transmits signals via local antenna

40
Q

Dynamic IP Addresses

A

IP address are automatically assigned to devices within a network by a DHCP server
Dynamic Host Configuration Protocols
- Server that automatically assigns IP addresses of all systems on a network
- 4 Steps DORA
1 Discover - devices tries to locate DHCP
2 Offer - DHCP offers IP to device
3 Request - device request IP from offer list
4 Acknowledge - DHCP confirms new device IP

41
Q

Static IP Addresses

A

IP address for devices on a network that has been manually assigned so that it doesn’t change
- Disable DHCP on the device
- set IP reservation on the IP address that will associate a MAC address with an IP address

42
Q

APIPA

A

Automatic Private IP Addressing
(link-local address)
- An address assigned to a devices when it cannot access a DHCP
- Devices will not be able to access the internet but will be able to communicate with other devices on the network
- IP address range:
169.254.0.0 - 169.254.254.255

43
Q

IPv6 short hand notation

A

1) Remove leading zeros
2) first multiple sequences of zeros can be replaced with :
2001:0db8:0000:0000:0abc:0000:def0:1234
= 2001:db8:0000:0000:abc:0:def0:1234
= 201:db8::abc:0:def0:1234

44
Q

Port

A

Unique ID for a service using TCP or UPD for transport.

CompTIA Terminology (7 decks)

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