networks Flashcards
What is LAN and how is it connected
- Small geographical area
- Hardware owned by organisation
- connected with ethernet or wifi
What is WAN and how is connectuded
- WAN connects LANs that are in different geographical locations
- Infrastructure is hired
- Connected using either fibre optic, copper, sattelite links or radio links
What factors affect Performance of networks
- Bandwidth (amount of data transferred in a given time). Bandwidth is shared amongst users
- If using wired or wireless
- Choice of hardware and network topology
What is an NIC
Allows a device to connect to a network. Used for wireless and wired
What is a switch
- Switches receive data from one device and transmits the data to the device with the correct MAC address.
What is a router
- Connects networks together
What is a wireless access point?
- Hardware that connects to a switch and allows WiFi devices to access the networks
What is an ethernet cable?
- Twisted pair cables
- four copper wires joined together
What are coaxial cables?
- Single copper wire surrounded by insulation to prevent interference
What are fibre optic cables
- Transmit data as light
- expensive
- high performance
What does DNS stand for and how does it work?
- Domain name service
- Send a request to the DNS server for the IP linked to the domain name
- The DNS server will send the IP back to the client who can then continue with their request
What are the advantages of the cloud?
- Secure
- Easy to access
- It updates automatically
What are the disadvantages of the cloud?
- No control over date
- Pricing
- Internet required
What are the mail protocols
FTP - move files between devices on a network
POP - holds email on server until you download it
IMAP - retrieve emails. holds email on server till deleted
STMP - send emails
What are the internet protocols?
HTTP
HTTPS
TCP - Set rules for how devices connect on a network
IP - responsible for packet switching
What are layers and their advantages
- A layer is a group of protocols which have similar functions
- Layers are self-contained
- Breaks down network communication into manageable pieces
- Having set rules forces companies to make compatible and universal hardware
