Networking Flashcards
Which type of network is the most common and how large are they?
LAN, usually up to 255 machines but can be higher
Which topology is better is better for security?
Star topology, as messages are sent from one machine to another and not widely broadcast
Which topology is better for large amounts of data sent between two machines?
Star, as the data flowing between those machines will not stop other machines transmitting
Which protocol is used for wired networks?
CSMA/CA, it minimises the communication overhead and so maximises the space for useful data
Explain the hidden terminals problem for CSMA/CA
Two or more stations who are out of range of each other transmit simultaneously to a common recipient believing the network is clear so the 3rd machine receives both data at once leading to incomplete and garbled data
What media would be best used for a network between several sites in the same city?
Fibre optic for longer distances as they are smaller and easier to run. Ethernet cable for shorter runs, they are what most machines are set up to connect to
What would be the effect on the network if a router, switch and access point were removed from a home network?
Router: no internet access
Switch: no ability to connect wired devices
Access Point: no ability to connect wireless devices
How are networks built over a long distance?
Repeaters are used to boost the signal but this can add a slight delay and costs money/ required power
Three real-world examples of Client Server systems
Games, Login system, Social Media/Chat apps. The most common reason is that they depend on Security Reliability as data is needed around the clock so the server must be reliable
Why are peer-to-peer models are typically used for file sharing?
Large number of peers allows high file transfer speeds without large server costs
Give an example of a major distributed system that is in use today and what are its benefits?
Amazon Web Services and other large cloud systems. It ensures it’s always accessible and can help keep access if the system is distributed worldwide
What are the benefits of a VPN?
It allows access to local network resources over an encrypted connection that keeps the transferred data secure and allows for more control over the route connection take
Advantages of IPv6 over IPv4 and how is the wide scale implementation of that going?
Large number of IPs, easier routing, local IPs more accessible online. Older hardware systems may need to be updated. Some countries not yet hitting problems.
How does a VPN work?
By routing a device’s internet connection through a private service rather than the user’s regular internet service provider (ISP)
What is a VPN?
A Virtual Private Network creates a virtual network over the internet
