3.1 - Networks Flashcards
3.1.1. What is a network?
A group of nodes connected via a transmission medium used to share resources
3.1.1 What is a LAN?
- it is a local area network, that acts over a small geographic area, and devices are private infrastructure
- they are switched based using MAC addresses
3.1.1 What is a WLAN
- a wireless LAN
- it uses radiowaves
3.1.1 What is a VLAN
- a virtual LAN
- a software based partition of a physical LAN
3.1.1 - What is a WAN
- a wide area network that acts over a large geographical area, connecting multiple LANs
- they are router based using IP addresses
3.1.1 What is a PAN?
- a Personal Area Network that usually uses bluetooth
3.1.1 What is a SAN?
- a Storage Area Network using shared server base file management
- it gives shared access to a storage area
3.1.1 - What is a Intranet
- a restricted access private network
- resources on this can only be accessed via the private LAN
- intranets are very secure
3.1.1 - What is an extranet?
- it provides remote access to most intranet services and apps, using authentication as a security method
3.1.1 - What is a VPN?
- a Virtual Private Network that extends private networks across a public network
3.1.2 - What is a Newtork Standard
- they are an an agreed way of doing things, ensuring interoperability between devices
3.1.2 - Why are network standards important?
- describes accurately how information is transmitted -> enables reliable communication between devices
- without standards communication would be impossible
3.1.4 - What is encryption?
- converts plaintext into cipher text, and requires a key to be read protecting the data
3.1.4 What is Tunneling?
- it is a secure pathway through a public network
- the tunnel js created using protocols
3.1.5 - Benefits of Teleworking via VPNs
- increased productivity
- reduced chance of resigning -> happier employees
- less stress
- smaller environmental impact
3.1.5 - Disadvantages of Teleworking via VPNs
- needs a professional with detailed understanding of the work to support the employees
- not all VPNs are compatible with products
-blurring boundaries for a work-life balance
3.1.3 - Why do we need layers?
- self contained (errors in one layer won’t affect the other)
- similar protocols are grouped into a layer
- software developers can work on one layer without affecting the others
3.1.3 - OSI name of all 7 layers
application
presentation
session
transport
network
data link
physical
3.1. 3 - What layers are within TCP/IP stack? And their purpose.
(ATNL)
- Application: presents and prepares data for transmission
- Transport: splits data into packets
- Network: IP addresses are added (sender + receiver)
- Link: MAC addresses are added and data is transmitted (packet switching)
3.1.6 - What is a protocol?
A set of rules for data transmission over a network
3.1.7 - 3 purposes of protocols
- to allow communication -> without protocols, different devices would use different rules for transmission
- manage flow control -> rate at which sender is transmitting data is in proportion to receiver’s receiving capabilities
- perform error checking -> ensures data is accurate and consistent
3.1.8 - What are some primary factors that affect network speed?
- the ISP (internet service provider) being used
- cable quality
- type of connection
3.1.8 - What are some secondary factors that affect network speed?
- traffic
- time of day
- distance
- infrastructure
3.1.9 - What can we use compression for?
- backups
- file transfer
- media transfer
- encryption and protection
