ch2 Flashcards
(53 cards)
whats NIC
A device that allows a computer to connect to a network
associated with a MAC address
what’s an ethernet
a protocol used by many wired networks
standard cable used to connect devices
what’s a router
device that allows data packets to be routed between different networks ex Lan joint a wan
what’s a bridge
a device that connects LANS which use the same protocols
what’s a WAPPPP
a device that allows a computer to access a LAN without a wired connection
wireless access point
what’s a server
a powerful computer that provides functionality to other computers in a network
file server, email server, print server
what’s a repeater
a device used to boost a signal on both wired and wireless networks
what’s the function of a router in a network
- routes data packets — it determines the best path for data packets to travel across a network from the source to the destination, using routing tables and algorithms
- connects networks — routers link multiple networks together such as connecting a LAN to a WAN
- directs traffic —routers manage network traffic by forwarding data packets between different networks, ensuring that data reaches the correct destination
- network security — routers can filter incoming and outgoing data using access control lists helping to secure the network from a unauthorised access
how are collisions effect and avoided in ethernet
collisions occur when two devices try to send data simultaneously on the same network segment, leading to interference and data loss
you can avoid this by using a CSMA this allows device to check in communication channel is IDLE before transmitting if it’s busy it will wait until it’s idle
how can u detect a collision
by monitoring the voltage on cable if a sudden change happens then it indicates a collision
what happens after a collision
both devices stop transmitting when collision is detected
a jamming signal is sent to notify other devices of the collision
device waits for a random period before attempting to resend the data
what’s a subnet mask
a technique used to divide large networks into smaller more manageable subnetworks or subnets.
urs goood for organisation
securing networks
efficiency using IP addressses
the subnet mask divides an IP address into a network and a host part
subnetting creates SMALLER networks and makes it easier to manage and secure a network
what’s a network
when u connect one computing device to another either via cable or wireless
what’s a client server
a sever that controls access and security to one shared file store
a server manages printing jobs
a server provides email services
a server runs a backup of data
a client makes requests to the server for data and connections
adv and disadv of client servers
adv.
easier to manage security of files
easier to take backups of all shared files
easier to install software updates to all computers
disadv
- expensive to setup and maintain
- requires IT specialists to maintain
- the server is a single point of failure users will lose access if the server fails
whats peer to peer
a peer is a computer on the network which is equal to the other peers
- each peer is responsible for its own security
- peers serve their own files to each other
- each pear is responsible for its own backup
- they usually have they’re own printers so it takes time
adv and disadv of peer to peer
adv. easy to maintain
- no dependency on a single computer
- cheaper to set up
disadv
- network less secure
- users need to manage their own backups
- can be difficult to maintain a well ordered file store
what’s the diff between thick and thin client
thin client relies on a connection to a remote server or computer for it to work
while thick can run some features of software even when not connected to server
- thin requires very few local resources like RAM memory
while thick relies heavily on local resources - thin relies on good stable and fast network connection for it to work
while thick is more tolerant of a slow network connection - thin has data that’s stored on a remote server or computer
while thick stored data in local resources like HDd or SSD
whats thick and thin client computing
it’s a term which refers to the amount of processing and storage that it does in comparison to the server it is connected to
thick client
majority of processing and storage done on client
thin
very little processing and storage done by client but majority of processing and storage done on server
whats BUS topology
it uses a single central cable to which all computers and devices are connected.
it’s easy to expand and requires little cabling
data travels in one direction if data is being sent between devices others can’t transmit
disadvantages of bus and adv
if main cable fails the whole network fails
the performance of network deteriorated under heavy loading
the network is not secure since each packet passes through every node
adv
if one node fails the rest work
it’s easy to increase the size of the network by adding additional nodes
whats star network
used a central huh and each computer is connected to the hub data going from host to host is directed through the huh. each computer has it own dedicated connection to central node any tips of network cable can be used for connections this is usually a client server
what are adv and disadv of star
adv. data collisions are reduced due to the topology
more secure network since security methods can’ be allied to central nodes
easy to improve by installing an upgraded switch
if one connection breaks it affects on of the nodes
disadv
expensive to install
if central hub fails the whole network goes down
whats mesh top what are two types
two types
routing and flooding
routing works by giving the nodes routing logic so that data is directed to its destination by shortest route
flooding sends the data via all the nodes and uses no routing logic which leads to unnecessary loading on the network
it uses peer to peer network
