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Network+ > 4 > Flashcards

4 Flashcards

1
Q

4 advantages of Wireless Mesh

A
  • Self Healing (Self adapt when a node is added/ network failure or removed)
  • Scalable
  • Reliability (redundant paths)
  • Cost (Cuts down cost of wires)
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2
Q

5 Toplogies

A

Bus, Ring, Star, Mesh and Wireless

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3
Q

Advantages of a Mesh (2)

A
  • Redundant paths
  • Scalability
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4
Q

Advantages of a star topology (3)

A
  • Cable failures affect one user
  • Scalability
  • Easy to troubleshoot
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5
Q

Advantages of a Ring (2)

A
  • Easy to implement
  • Easy to troubleshoot
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6
Q

Advantages of Bus Topology (3)

A
  • Easy to implement
  • Less cabling
  • No extra network equipment
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7
Q

As the data moves down, is it Encapsulating or Decapsulating?

A

Encapsulating.

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8
Q

True or False
client-server network require a server

A

True

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9
Q

Difference between LAN and WAN (4)

A
  • WAN are slower than LAN
  • WAN requires additional cost for routers, leased lines, hardware and complicated implementations procedure
  • LAN is usually high speed and cheaper
  • LAN is for sharing files and resources
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10
Q

Disadvantages of a Mesh (2)

A
  • More cables/cost
  • Implementation is complicated
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11
Q

Disadvantages of a Ring (2)

A
  • Scalability
  • Single break will break the network
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12
Q

Disadvantages of a star topology (3)

A
  • Higher cost for cabling
  • Single point of failure
  • Additional network to create network layout
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13
Q

Disadvantages of Bus Topology (3)

A
  • Scalability
  • Broken wire will disrupt the whole network
  • Difficult to troubleshoot
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14
Q

Explain Ad Hoc Infrastructure Wireless Topology

A

Devices communicate directly among themselves without requiring an access point. This is Peer-to-Peer network designed to connect a few computers and devices

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15
Q

Explain ADSL

A

Asymmetric Digital Subscriber Line is a high data rate in one direction. The high data rate is the downloading of the data but slower upload

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16
Q

Explain Bus Toplogy

A

A Bus Topology uses a trunk or backbone to connect all the computers together. These computers are connected via a T-Connector

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17
Q

Explain HDSL

A

Hight-Rate DSL is a bidirectional rate of upload and download speed. This is great for video conferencing. It does not allow line sharing with analog device

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18
Q

Explain Infrastructure Wireless Topology

A

This network extends a wired local area network to include a network device. This is communicated via an access point such as a router

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19
Q

Explain Mesh Infrastructure Wireless Topology

A

Wireless mesh is a network where all nodes in the network are interconnected wirelessly. These are all connected via wireless access points

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20
Q

Explain Mesh and Hybrid toplogy

A

Mesh is a fully cable connected network. All devices are connected to each other. A hybrid topology uses a point-to-point connection between specified networks devices. Such as a mixture of topologies such as a bus and star can be in a scope of a topology. Not everything is connected to each other.

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21
Q

Explain MON

A

Metro-Optical networks are optical networks that span over hundred kilometres in metropolitan areas.

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22
Q

Explain PAN

A

Personal Area Network which are devices that are close within proximity. This usually has a peer-to-peer connection such as Bluetooth

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23
Q

Explain SONET

A

Synchronous Optical Network is a fiber optic WAN that delivers voice and speed at 51.84 Mbps

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24
Q

Explain Star Toplogy

A

Star topology uses a central device which can be a hub or switch. This central device is connected to all devices on the network. A cable connects the device to the central network with a point-to-point connection

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25
Q

Explain Token Ring

A

Token ring is a network that utilised MSAU with Ring In and Ring Out

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26
Q

Functions of a CSU/DSU

A

Functionality of a channel service unit/data service unit is convert digital signals from a router to a network circuit

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27
Q

How do you reduce risks with multi-tenancy?

A

Multi-tenancy is where data in the cloud is accessible to individuals. Setting up different access policies will create Data Segregation.

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28
Q

How does Cable Broadband connect

A

Connectivity is done through a cable modem and connected by a coaxial connection to a system

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29
Q

What is PDU?

A

Protocol Data Unit

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30
Q

How is a CSU/DSU connected

A

The LAN is connected via a physical connection and WAN by serial interface

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31
Q

How is Cable Broadband available

A

Cable broadband is available through areas that have digital cable television.

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32
Q

How many types of T-Carrier lines

A

4

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33
Q

List 2 advantages of a Virtual Switch

A
  • Multiport devices which improve network efficiency
  • Improves network security due to virtual circuits more difficult to examine with network monitors
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34
Q

List 2 disadvantages of Satellite

A
  • Cost is high
  • High Latency
35
Q

List 2 indicators that termination is working

A
  • Network interface card is lit
  • If you connect to client systems and ping other devices
36
Q

Name 3 termination points

A

Wall Jack
Plug
Patch Panel

37
Q

Name the 7 Layers

A
  1. Physical
  2. Data Link
  3. Network
  4. Transport
  5. Session
  6. Presentation
  7. Application
38
Q

PSTN drawback in WAN

A

PSTN drawback is the limited transfer speed

39
Q

Explain RADSL

A

Rate Adaptive DSL is a variation of ADSL that can modify transmission speed depending on the signal strength

40
Q

True of False
Home Satellite systems are asymmetric

A

True.

41
Q

True or False
Lease lines are always-open and always-available

A

True

42
Q

True or False
Modems are not used to convert the computer system’s digital signals into analog

A

False
Modems are used to convert digital signals to analog

43
Q

True or False
Networks are classified according to their geographical size and coverage

A

True

44
Q

True or False
Peer-to-Peer require a server

A

False

45
Q

True or False
Satellite is an always-on and always-available connection

A

False.

Satellite is only always-on connection

46
Q

True or False
T-Carrier lines only support voice transmission

A

False
The support voice and data transmission using point-to-point

47
Q

Explain VHDSL or VDSL

A

Very High Bit Rate DSL is asymmetric version of DSL which supports high bandwidth such as VoIP. VHDSL uses fiber optic and rates of 10 Mbps

48
Q

What are the 3 components of a DWDM?

A
  • Terminal Multiplexer
  • Line Repeaters
  • Terminal Demultiplexer
49
Q

What are CSU/DSU?

A

Channel Service Unit/ Data Service Unit

50
Q

What are leased lines

A

Leased lines are T-Carrier lines that are high speed digital lines leased from the telephone companies

51
Q

What are smart jacks?

A

Smart jacks are hardware demarcation point also known as network interface device (NID).

52
Q

What are two components that make up a PON?

A

Optical Line Termination (OLT) and Optical Network Units (ONU)

53
Q

What data do switches contain

A

Table of MAC Addresses

54
Q

What did Europe call their SOnet

A

Synchronous Digital Hierarchy SDH

55
Q

What did T3 lines achieve

A

T3 provide high capacity over long distance which were used by large companies

56
Q

What do Europe and Japan call their T-Carrier service

A

Europe refers to E-Carriers

Japan refers to J-Carriers

57
Q

What does DWDM replace?

A

It replaces SOnet/SDH regenerators as it increases the bandwidth of the fiber networks

58
Q

What encryption protocol does the Presentation Layer use?

A

Transport Layer Security (TLS), which takes place for encryption and decryption function

59
Q

What hardware does the physical layer have?

A

Cable and Connectors

60
Q

What model has only 4 layers?

A

TCP/IP

61
Q

What is a WAN’s geographical location bounded to?

A

More than one geographical Location

62
Q

What is a Demarc Extension?

A

An existing point of the demarc box might not be ideal demarcation point. A demarc extension is required when location is not where it is located

63
Q

What is a fractional T

A

This is where you can lease portions of the T-Carrier service which is a subscription on based on 64 Kbps channel

64
Q

What is a LAN’s geographical location bounded to?

A

Single Geographical Location

65
Q

What is a Toplogy?

A

Topology is made up of Physical and logical layout of a network

66
Q

What is CAN

A

Campus Area Network

67
Q

What is CWDM?

A

Coarse Wavelength-Division Multiplexing for television cables.

68
Q

What is Data Encapsulation/Decapsulation

A

Adding or stripping the header or trailer of the data.

69
Q

What is Demarc?

A

Demarcation point is to extinguish the operator’s part of the network and customer portion.

70
Q

Explain IDSL

A

Integrated Services Digital Network ISDN DSL is Symmetric DSL and does not support analog phones

71
Q

What is MAN

A

Metropolitan Area Network

72
Q

What is MSAU

A

Multistation Access Unit

73
Q

What is NFV?

A

Network function virtualisation is a method of virtualising network services instead of running them on physical hardware.

74
Q

What is one disadvantage of Cable Broadband

A

Sharing the cable access with everyone in the cable area can cause speed to drop

75
Q

What is SOnet goal?

A

SOnet goal was to standardise access methods for all carriers within the US market

76
Q

What is the form of multiplexing Optical Signals?

A

Dense Wavelength-Division Multiplexing (DWDM)

77
Q

What is the physical component of a network?

A

Physical component is the network, computer and connections of the network

78
Q

What is WLANs

A

Wireless LAN are providing wireless network to a LAN. This is done via an access point. WLAN receive data through radio frequencies

79
Q

What new system did SOnet produce?

A

SOnet produced a new system defining data rates called Optical Carrier (OCx)

80
Q

Name Protocols that are in the Transport Layer?

A
  • UDP
  • TCP
81
Q

What twisted pair does Cable Broadband use

A

Unshielded Twisted Pair

82
Q

Who is the host and guest between Virtualisation software and virtual machines?

A

Guest is virtual machines

Host is the virtualisation software

83
Q

Why is Demarc important?

A

Demarcation allow the network administrator establish which part of the network is covered by who.

84
Q

Why is it called PON?

A

Passive Optical NetworkIt is known as a passive system because the components have no power.

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