12: Networking Flashcards
to enable a device to access any type of network they will need a …….
network interface card (NIC)
what are the two main types of networks
- local area network (LAN)
- wide area network (WAN)
explain what a LAN is
network thats confined to relatively small areas such as a building
explain what a WAN is
network that spans a large area such as possible several continents
give 3 advantages of a LAN
- enhanced security
- low error rate
- higher transmission rates
- cost effective
- reliable
give 2 advantages of a WAN
- wider coverage
- highly scalabale
explain a star network toplogy
consists of a central computer to which all other devices are attached to
give 2 advantages of a star toplogy
- easier to maintain
- access files on all computers
- high speed
give 2 disadvantages of a star toplogy
- if main computer breaks then this affects all other devices
- requires more cabling
- limited number of connections
explain a bus network topology
single length of transmission cable onto which various devices are attached
give 2 advantages of a bus topology
- simple layout - not as much cabling is needed
- easy to extend
give 2 disadvantages of a bus topology
- if main cable breaks then entire network is affected
- hard to find where fault is
- less secure
- collisions more likely
what does physical topology mean
the actual layout and connection of the cables
what does logical topology mean
the way data is transmitted around a network
explain what a client server network is
computer uses resources housed inside a central server
explain what a thin client is
all processing done on central server
explain what a thick client is
powerful pcs connected to a network where all processing is done on the pc
explain what a peer to peer network is
two or more computers connect and share resources
give 3 advantages of a wireless network
- no cabling required
- can handle large number of users
- user can move around freely
give 3 disadvantanges of a wireless network
- slower speeds
- connections become weaker further away u are
- signal can be easily obstructed
- less secure
what is an SSID
the way a wireless network can be identified
what is a mac address
uniquely identifies a unique device
explain CSMA/CA without RTS/CTS in a flow diagram format
explain CSMA/CA with RTS/CTS
- assemble a frame
- check if channel is idle
- if not it will wait
- if idle than a request to send is sent
- a clear to send is then sent
- if clear to send is no then wait
- if clear to send is yes then transmit data
why is a wireless signal less secure than a wired network
signal is easier to intercept
give 3 ways to enhance security of a wireless network
- change SSID and hide it from transmission
- ensure all devices are WPA/WPA2
- create a list of mac addresses from devices you know to be trustworthy
explain how encytping data with WPA/WPA2, disabling SSID broadcasting and mac address whitelisting could enhance the security of a wireless network
- WPA = encyrpts data do reduces chance of unwanted devices to be able to read data
- mac address = only trusted devices will be able to join network
- SSID = disabling it means it wont show in a search
explain the process the receiving device does when receiving data
majority voting
- the transmitting device would send each bit an odd number of times
- the receiver checks the bits and assumes the one it receives the most copies of is the correct value
Explain the operation of a logical bus network topology
- node broadcasts data to the entire network
- all nodes recieve the data
- a node examins the recieved data to check if it the intended recipient
