Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Networking + Self Made > Chapter 4 - Network Topology and Technology > Flashcards

Chapter 4 - Network Topology and Technology Flashcards

1
Q

Logical Topology

A

How data is transmitted between nodes and the way signals respond on network media.

Is a function of network protocols in use to transfer data across the network.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Physical Topology

A

The network layout of devices and how they’re arranged, connected and communicate with each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Star Topology

A

Most common

Each node connects to a central hub or switch. Creating a central connection point for all systems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Star Advantages

A

Easy to implement
Easy to troubleshoot
Easy to upgrade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Star Disadvantages

A

If Sentra hub fails, everything connected is disabled.

Recommend implementation or redundancy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Ring Topology

A

Each ring node is responsible for passing information to and from each other.

Can only directly communicate to devices net to each other in the ring.

Information passes through to the next system till arriving at the destination.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Ring Advantages

A

Reduced collision chance.

Can us a token ring to prevent collision as information is out into a token that moves around to the needed device.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Ring Disadvantages

A

If one node goes offline it effects the entire network.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Mesh Topology

A

A system is connected to every other system on the network.

Makes many redundant connections with no central connection which makes it complex to implement.

Critical devices are normally set up as mesh for redundancy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Mesh advantages

A

Withstand high traffic volumes
Redundancy
Expand network without interruptions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Mesh disadvantages

A

Difficult to manage

Expensive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Bus Topology (Linear Bus)

A

Network consists of a main trunk which devices are connected.

Needs two end points so signal doesn’t reflect back by using a terminator.

A terminator kills the signal with high resistance

All devices receive all messages

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Bus advantages

A

Easy to set up

Inexpensive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Bus disadvantages

A

Limit to the size
Hard to troubleshoot
Venerable to wire tapping

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Adhoc wireless

A

LAN

Built as devices are connected to each other and the wireless device

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Adhoc Wireless advantages

A 
Bribes need for a router
Affordable
Mobile
Easy setup
Fast to connect multiple devices and computers with no addition hardware
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Infrastructure Wireless Network

A

Devices with connect to a wired network using an access point
WLAN extends the wired LAN to wireless devices

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Infrastructure Wireless Advantages

A

Scalable
Uses wireless access points to reduce congestion and increase coverage
Move between access points without dropping connection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Infrastructure Wireless disadvantages

A

Complex
Costs more
Requires wireless access points

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

LAN

A

Local Area Connection
Smaller network typically in a room, building or group of buildings
Can be Ethernet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

LAN Characteristics

A

Topology of arrangement of devices as start, ring or mesh
Protocol rules and encoding specifications
Media of cabling used

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

WLAN

A

Wireless LAN
Enables wireless network communication
Uses WAP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

MAN

A

Metropolitan Area Network
Data network designed for a city or town
Connects multiple LANS
Can connect a central office to branches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

MAN Benefits

A

Efficient
Fast communication
High speed carriers using fiber
Dedicated connections

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

WAN

A

Wire Area Network
Spans large geographical areas (Internet)
Can use a dedicated connection using a Telco company internet instead of public internet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

CAN

A

Campus Area Network

Proprietary LAN used to Server a corporation, university or government agency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

SAN

A

Storage area network
Specialised high speed network to storage granting block level access.
Communicate with hard drives arrays and can only access a dedicated portion of the array (Block Access)

High storage and performance using a dedicated connection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

SAN Advantages

A

Able to offload app storage
Redundancy
Consolidation of resources
Tiered storage to access SSD or HDD depending on requirements
Data protection and security as everything is centrally locates
Use redundancy and dedicated staff at facility

29
Q

IoT

A

Internet of Things

Growth of internet enabled devices and communication between them.

Laptops
Smart Phones
Watches
Lighting
Entertainment systems
30
Q

Z-Wave

A 
Wireless communication protocol
Automated home devices like
Heating, Ventilation, Aircon (HVAC)
Home Cinema 
Security Systems
Garage
31
Q

ANT

A

Wireless communication protocol is open access wireless service technology
Uses 2.4GHz, sensor wireless type
Ultra low power
Used in fitness monitors for heart test, speed and temperature readings.

32
Q

Bluetooth Smart

A

Energy efficient and low power compared to original Bluetooth
Most devices support it
Used for precise location finding and senses when you leave a room to turn off lights

33
Q

NFC

A 
Near Field Communication 
Contactless 
Supported by smart phones and tablets
Fast
Convenient 
Zero configuration
Can use different protocols to transfer data
34
Q

RFID

A

Radio Frequency Identification

Uses radio frequency waves in LF, HF and UHF
Commonly used in chips and
Access control cards
Asset tracking
Parking management
Patient ID
Inventory management
35
Q

802.11 Wireless

A 
Wireless networking 
Uses radio frequencies 
Low energy consumption
Wider coverage range
Supports IoT

Familiar home implementation with a wireless router(modem)

36
Q

802.11 Standards?

A
  1. 11a (5GHz, 54mbps)
  2. 11b (2.4GHz, 11mbps)
  3. 11g (2.4GHz, 54mbps, compatible with 802.11b)
  4. 11n (both 2.4GHz and 5GHz, 300mbps, uses MIMO)
  5. 11ac (simultaneous use of 2.4 and 5GHz, compatible with b,g,n, 2.4GHZ @ 450mbps, 5GHz @ 1300mbps)
37
Q

GSM

A

Digital Cellular
900MHz and 1800MHz

Digitises and compresses sata prior to sending.

38
Q

TDMA

A

Time Division Multiple Access

Divides channels into three time zones.
Increase amount of data that can be carried.

Each channel is divided by time. Each device syncs to the time slot to accomodate multiple users on one channel.

39
Q

What’s cellular technologies is TDMA?

A

Global System for Mobile Communications (GSM)

Digital Advanced Mobile Phone Service (DAMPS)

Personal digital cellular (PDC) morning

40
Q

CDMA

A

Code division multiple access

Used in 2 and 3G
Form of multiplexing
Allows multiple signals on a single transmission to optimise bandwidth

Common in ultra high frequency 800 to 1.9GHz

Each transmission has a specific code. Your device only pays attention to that specific code which matches your connection.

41
Q

CDMA Advantages

A

Good signal quality
Flexible resource allocation
Easily scalable
Compatible with other cellular technologies

42
Q

CDMA Disadvantages

A

As network grows overall signal quality degrades

43
Q

Frequency

A

Refers to the number of complete cycles in a single second

Measured from peak to trough

44
Q

Low frequencies

A

Large radio wave lengths

45
Q

High Frequency

A

Short radio wave lengths

46
Q

IEEE 802.11 frequency ranges

A
  1. 4 to 2.5GHz

5. 15 to 5.876GHz

47
Q

2.4GHz Stabdards

A
  1. 11b - 11mbps
  2. 11g - 54mbps
  3. 11n - 150mbps (20MHz channel width), 300mbps (40MHz channel width)
    * Doubling channel width, doubles mbps through put*
48
Q

2.4GHz advantages

A

Wider coverage
Better object penetration
Supports b, g, n

49
Q

2.4GHz disadvantages

A

Greater interference

Less data speed

50
Q

5GHz Standards

A
  1. 11a - 54mbps
  2. 11n - 150mbps (20MHz channel width), 300mbps (40MHz channel width)
  3. 11ac - 6.8gps with 8 antennas running 160MHz channel width.
51
Q

5GHz advantages

A

Less congestion and interference
23 non overlapping channels
Supports higher network speeds of 802.11ac

52
Q

5GHz disadvantages

A

Small signal area
Poor obstacle penetration
May not support older devices

53
Q

Original IEEE 802.11 standard

A

2.4GHz
1 to 2 mbps
20ft range

54
Q

802.11a

A

5GHz
54mbps
25 to 75ft range

55
Q

802.11b

A

2.4GHz
11mbps
150ft transmission range

56
Q

802.11g

A

2.4GHz
54mbps
150ft ranger

57
Q

802.11n

A

2.4GHz and 5GHz
Up to 600 mbps
175ft range

58
Q

Channel Bandwidth

A

Directly effects data transfer rates

  1. 11n 20/40MHz Channels
  2. 11ac 20/40/80/160MHz Channels

MHz is a measurement of how often something is sent. The higher it is the more data can be sent.

59
Q

Channel Width

A

WiFi uses frequency and channels to transmit and receive data.

Default channels are 6 and 22 as they’re far apart, limiting channel overlap which reduces interference.

Eg Channel 6 bleeds into 4,5,7,8
Channel 11 bleeds into 9,10,12,13

60
Q

Channel Bonding

A

Use in 802.11
Is when two adjacent channels using different frequencies and combined.
Increases device through put.
Provides additional functionality and increased through out
Reduces # of channels

Eg 2 20MHz channels and be bonded to make one 40MHz channel.

61
Q

Channel bonding 2.4GHz

A

Support 3 non overlapping 20MHz channels
Total width 70MHz
Can only have 1 single bonded pair of 40MHz confirmed
Throughout up to 54mbps

62
Q

Channel bonding 5GHz

A

Up to 25 non overlapping 20MHz channels
Total 500MHz width
More bonded pairs can be confirmed
Up to 160MHz using 802.11ac for high through out

63
Q

MIMO

A

Multiple Inout Multiple Output

Wireless antenna technology.
Sends multiple signals at once using array of antennas.
Antennas combine to help minimise errors and optimise data speed.
Supports 802.11n and 802.11ac.

64
Q

Single user MIMO

A

Multiple sessions at a time between each device which gets its own turn
Not as fast as multi user

65
Q

Multi user MIMO

A

Multiple independent radio terminals to access a system
Enables 802.11ab max transfer of 6.93gbps

Usurps multiplexing to allow simultaneous communication with multiple devices.

Allows multiple users to simultaneously access the same channel and enhance performance.

66
Q

Passive site survey

A

Access points for signal strength, Interface and coverage

Provides good overall picture of Wireless characteristics of network.

No connection to access points.

67
Q

Active site survey

A

Gathers detailed information of

Network traffic patterns
Overall through put
Packet loss
Physical rates

You make connection to access points.

68
Q

Predictive site survey

A

Performed with no field measurements
Utilises RF planning software tools for coverage
Used when site is being built to help planning and budget

69
Q

Site survey documentation

A 
Site maps
Recommendations 
Issues relating to coverage, capacity and interference
Heat map signal strength 
Future coverage after implementations

Networking + Self Made (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions