4 Flashcards
4 advantages of Wireless Mesh
- Self Healing (Self adapt when a node is added/ network failure or removed)
- Scalable
- Reliability (redundant paths)
- Cost (Cuts down cost of wires)
5 Toplogies
Bus, Ring, Star, Mesh and Wireless
Advantages of a Mesh (2)
- Redundant paths
- Scalability
Advantages of a star topology (3)
- Cable failures affect one user
- Scalability
- Easy to troubleshoot
Advantages of a Ring (2)
- Easy to implement
- Easy to troubleshoot
Advantages of Bus Topology (3)
- Easy to implement
- Less cabling
- No extra network equipment
As the data moves down, is it Encapsulating or Decapsulating?
Encapsulating.
True or False
client-server network require a server
True
Difference between LAN and WAN (4)
- 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
Disadvantages of a Mesh (2)
- More cables/cost
- Implementation is complicated
Disadvantages of a Ring (2)
- Scalability
- Single break will break the network
Disadvantages of a star topology (3)
- Higher cost for cabling
- Single point of failure
- Additional network to create network layout
Disadvantages of Bus Topology (3)
- Scalability
- Broken wire will disrupt the whole network
- Difficult to troubleshoot
Explain Ad Hoc Infrastructure Wireless Topology
Devices communicate directly among themselves without requiring an access point. This is Peer-to-Peer network designed to connect a few computers and devices
Explain ADSL
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
Explain Bus Toplogy
A Bus Topology uses a trunk or backbone to connect all the computers together. These computers are connected via a T-Connector
Explain HDSL
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
Explain Infrastructure Wireless Topology
This network extends a wired local area network to include a network device. This is communicated via an access point such as a router
Explain Mesh Infrastructure Wireless Topology
Wireless mesh is a network where all nodes in the network are interconnected wirelessly. These are all connected via wireless access points
Explain Mesh and Hybrid toplogy
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.
Explain MON
Metro-Optical networks are optical networks that span over hundred kilometres in metropolitan areas.
Explain PAN
Personal Area Network which are devices that are close within proximity. This usually has a peer-to-peer connection such as Bluetooth
Explain SONET
Synchronous Optical Network is a fiber optic WAN that delivers voice and speed at 51.84 Mbps
Explain Star Toplogy
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
Explain Token Ring
Token ring is a network that utilised MSAU with Ring In and Ring Out
Functions of a CSU/DSU
Functionality of a channel service unit/data service unit is convert digital signals from a router to a network circuit
How do you reduce risks with multi-tenancy?
Multi-tenancy is where data in the cloud is accessible to individuals. Setting up different access policies will create Data Segregation.
How does Cable Broadband connect
Connectivity is done through a cable modem and connected by a coaxial connection to a system
What is PDU?
Protocol Data Unit
How is a CSU/DSU connected
The LAN is connected via a physical connection and WAN by serial interface
How is Cable Broadband available
Cable broadband is available through areas that have digital cable television.
How many types of T-Carrier lines
4
List 2 advantages of a Virtual Switch
- Multiport devices which improve network efficiency
- Improves network security due to virtual circuits more difficult to examine with network monitors
List 2 disadvantages of Satellite
- Cost is high
- High Latency
List 2 indicators that termination is working
- Network interface card is lit
- If you connect to client systems and ping other devices
Name 3 termination points
Wall Jack
Plug
Patch Panel
Name the 7 Layers
- Physical
- Data Link
- Network
- Transport
- Session
- Presentation
- Application
PSTN drawback in WAN
PSTN drawback is the limited transfer speed
Explain RADSL
Rate Adaptive DSL is a variation of ADSL that can modify transmission speed depending on the signal strength
True of False
Home Satellite systems are asymmetric
True.
True or False
Lease lines are always-open and always-available
True
True or False
Modems are not used to convert the computer system’s digital signals into analog
False
Modems are used to convert digital signals to analog
True or False
Networks are classified according to their geographical size and coverage
True
True or False
Peer-to-Peer require a server
False
True or False
Satellite is an always-on and always-available connection
False.
Satellite is only always-on connection
True or False
T-Carrier lines only support voice transmission
False
The support voice and data transmission using point-to-point
Explain VHDSL or VDSL
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
What are the 3 components of a DWDM?
- Terminal Multiplexer
- Line Repeaters
- Terminal Demultiplexer
What are CSU/DSU?
Channel Service Unit/ Data Service Unit
What are leased lines
Leased lines are T-Carrier lines that are high speed digital lines leased from the telephone companies
What are smart jacks?
Smart jacks are hardware demarcation point also known as network interface device (NID).
What are two components that make up a PON?
Optical Line Termination (OLT) and Optical Network Units (ONU)
What data do switches contain
Table of MAC Addresses
What did Europe call their SOnet
Synchronous Digital Hierarchy SDH
What did T3 lines achieve
T3 provide high capacity over long distance which were used by large companies
What do Europe and Japan call their T-Carrier service
Europe refers to E-Carriers
Japan refers to J-Carriers
What does DWDM replace?
It replaces SOnet/SDH regenerators as it increases the bandwidth of the fiber networks
What encryption protocol does the Presentation Layer use?
Transport Layer Security (TLS), which takes place for encryption and decryption function
What hardware does the physical layer have?
Cable and Connectors
What model has only 4 layers?
TCP/IP
What is a WAN’s geographical location bounded to?
More than one geographical Location
What is a Demarc Extension?
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
What is a fractional T
This is where you can lease portions of the T-Carrier service which is a subscription on based on 64 Kbps channel
What is a LAN’s geographical location bounded to?
Single Geographical Location
What is a Toplogy?
Topology is made up of Physical and logical layout of a network
What is CAN
Campus Area Network
What is CWDM?
Coarse Wavelength-Division Multiplexing for television cables.
What is Data Encapsulation/Decapsulation
Adding or stripping the header or trailer of the data.
What is Demarc?
Demarcation point is to extinguish the operator’s part of the network and customer portion.
Explain IDSL
Integrated Services Digital Network ISDN DSL is Symmetric DSL and does not support analog phones
What is MAN
Metropolitan Area Network
What is MSAU
Multistation Access Unit
What is NFV?
Network function virtualisation is a method of virtualising network services instead of running them on physical hardware.
What is one disadvantage of Cable Broadband
Sharing the cable access with everyone in the cable area can cause speed to drop
What is SOnet goal?
SOnet goal was to standardise access methods for all carriers within the US market
What is the form of multiplexing Optical Signals?
Dense Wavelength-Division Multiplexing (DWDM)
What is the physical component of a network?
Physical component is the network, computer and connections of the network
What is WLANs
Wireless LAN are providing wireless network to a LAN. This is done via an access point. WLAN receive data through radio frequencies
What new system did SOnet produce?
SOnet produced a new system defining data rates called Optical Carrier (OCx)
Name Protocols that are in the Transport Layer?
- UDP
- TCP
What twisted pair does Cable Broadband use
Unshielded Twisted Pair
Who is the host and guest between Virtualisation software and virtual machines?
Guest is virtual machines
Host is the virtualisation software
Why is Demarc important?
Demarcation allow the network administrator establish which part of the network is covered by who.
Why is it called PON?
Passive Optical NetworkIt is known as a passive system because the components have no power.
