Networks Flashcards
Networks
A collection of computers and devices cpmmected by communication channels that facilitates communication between user and allows for sharing of resources
Advantages of a network
Sharing of data, information, hardware and software
Allowing communication
Disadvantages of a network
Need skilled staff to operate
Expensive to run and maintain
Types of networks
LAN
WAN
Network architecture
Peer to peer
Cilent server
Wireless Personal Network
Advantages of a Wired Networks
Faster data transfer
Better security
More reliable connection
Disadvantages of a Wired Networks
Lack of mobility
Installation requirement
Needs to be maintained
Types of cabling
Unshielded twisted pair
Fibre optic
Corexical
Advantages over UTP of Fibre optic
Can carry more signal
Faster transfer
Less susceptible to noise from other machines
Data loss is less over great distances
Disadvantages over UTP of fibre optic
Cable costs more
Cost alot to terminate at each end
Need specialist to maintain
Wireless networks standard
802/11X is the standard
a,b,g,n,ac,AX are categories
Wireless Networks
Wireless LAN
Mobile network
Satellite network
Microwave network
Infrared
Bluetooth
The internet of things
refers to the collective network of connected devices and the technology that faciliates communication between devices and the cloud as well as between the devices themselves
NIC
Allows a device to connect to a network
Where IP is stored
Server types
File Server
Web server
Proxy server
Database server
Mail Server
Print Server
DHCP
DHCP
Asigns an IP address to each device and gateway address in network
DNS
Links up the name of the device on network with IP
Back up server
control how back is performed
Active Directory Domain Controller
Responds to authentication request and verifies user. Also stores account information and enforces security policy
wAP
Acts as a central transmitter and receiver of wirless radio signals
Router
A device that connect multiple networks together
(Connects devices and protocols)
Switch
Device that provides connecting point for cables in a LAN
Decides which node that data is coming and going from
Modem
Connects LAN to internet by convertting analogy into digital and back
(not need in modern routers)
Firewall
Controls the traffic coming in and out of the network
(Network firewall or host-based firewall)
Network Operating System
Administration, file management, device managment and security. Controls computer systems and perpherals of network
Internet
Each devices as an IP address, either V6 or V4
Intranet
Private network accessible only by users within organisation
TCP
Converts data into packets.
Sends each packet towards the destination.
arranges the packets into the correct order when arriving
Reassembles the packets back into the correct format a the destination
IP
Responsible for the address and the routing of packets to the coorect destinatio, It uses packet switching to do this
Ethernet
A set of rules about how the data is communicated in wired network
Packet switching
Directs packets destination even if routes are different
File transfer protocol
Used to transfer files between devices
VPN
Allows users to use public networks as if they are using a private network
NAS
Device that offers data storage capabilities, users of the network can save and retrieve data from
Similar to file server but does not have the controll functions
Advantages of a NAS
- is it has a large storage capacity and it easy to add further storage capacity if
required. - It is relatively inexpensive and does not require a high level of expertise to set up and
manage - As it is located in the LAN, the organisation has full control over the data stored and
who has access to it.
Disadvantage of a NAS
- All the data is stored in one place, if there was a disaster the data would be lost.
- NAS is shared storage. As with other shared storage, system administrators must
enforce quotas without which a few users may hog all the storage at the expense of
other users
