Chapter one Flashcards
Server
Provides information such as emails and web pages to the other hosts on network
Advantage of peer to peer network
Easy to set up Its cheaper Transfer files and share printers
Disadvantage of peer to peer network
Not secure. Not scalable. The devices can act as server and client -slows performance No administration
Role of client
A client is computor host which requests and displays the information from the server
Define Fixed computing
You go to device
Define Internet of things
Age of devices
Define Internet of everything
People,data,things
Define peer to peer network
2 directly connected computers use wired/ wireless connection
Define Peer to peer file sharing
Share files with others without downloading or storing it from central server
Define Hosts and hosts device
Hosts- can send or receive messages on network can connect to multiply servers same time. Host device - source or destination of message transmitted over network and connects one host to another and uses IP address decide message goes
Define Network infrastructure and what they vary on
Supports the network and makes it stable Such as Devices ,media, servers. Network structures vary on size of area covered, no of users connected, and no and types of services available
What does Intermediary devices do
Interconnect end devices provides connectivity allows data flow across network Regenerates & transmits data signals Maintains information+chooses pathway Informs other device for error and communication failure
Eg of intermediary devices
Network access- switches, wireless Internet working- routers Security- firewall
3 types media to interconnect devices
Copper Fibre optic cable - rely on infrared/visible e.g glass, plastic. Wireless transmission - electromagnetic waves
Choose network depends on
Depends on environment if can be installed and distance can successfully carry signal
Network interface card
NIC or LAN connects to network at PC or host device
Physical port
Connector on network device so media is connected to host/ networking device
Interface
Specialised port on internetworking device and connects individual networks ( port on router are network interface which interconnects devices )
Define Physical topology
Identify the physical location of intermediary devices, configured parts, And cable installation
Logical topology
Identify the IP addressing, ports, device
Difference between LAN and WAN
LAN- connected by WAN and gives access to other users and end devices in small area such as schools , home WAN- wide area and gives access to other networks it is connected by service providers and Internet service providers
Difference between WLAN And SAN
WLAN- Interconnects users and end points in small area SAN- supports file servers and give data storage, retrieved and replicate and uses high bandwidth and fibre channel
Intranet and extranet
Intranet- private connection of LAN and WAN only organisation access it. Extranet- secure and safe access for individuals but require company data
DSL
Separates the DSL signal from the telephone and give Ethernet connection to host computor/ LAN Always connected to Internet, uses special modem and high bandwidth Depend on quality phone line and distance from company office
Dial up telephone
Uses any phone line and connects to ISP to access phone No . Uses any modem and its inexpensive low bandwidth and used for mobile travelling not for large data
Satellite
No access to DSL or cellular
Dedicated leased line
Connection service from service provider to customer premise and its reserved circuit which separate the office for private data and voice it’s rented monthly cost
Metro Ethernet
Gives customer over copper or fibre connection. fibre connection gives faster speed
Fault tolerance
Limits impact failure so less are affected and quicker recovery if occurred has multiple pathways
Scalability
Expand rapidly to support new users and application no affect on performance delivered such as WAN
Redundant connection
Allow alternative routes for device or link fails
Time sensitive communication and non time sensitive
Telephone or video disruption Non time sensitive - decreased priority for web pages or email
High importance organisation and undesirable communication
Increased priority for business transaction data. Undesirable - decreased priority or block unwanted activity
Network security and information security
Physical secure of device gives network connectivity and prevents unauthorised access to management software Information - protects information inside packets transmitted over network and information stored on network attached to device
Ensuring confediently and ensuring availability
Only authorised people devices access data strong system Availability - reliable acces to data services for authorised users end antivirus
Cloud computing
Allows you to store files and back up entire hard disk drive on servers and photo edit
WISP
An ISP which connects subscribers to designated acces point or hot spot using similar technology found in WLAN it’s found where DSL not available
Powerline networking
Home networking uses electrical wiring and connects to LAN if WAP not available or cannot reach device it saves cost installing cables and electrical bills
Virtualisation
Set of files and programmes running on physical system such as OS, storage device,hardware It reduces cost
Maintaining communication integrity
Data cannot be changed from source to destination only if information is corrupted
Data interception theft
Capture private information
Identity theft
Steal login credits of user to access private information
Example of intermediary devices
Wireless router , firewall appliance , router , LAN switch they only receive data
End devices
IP phone, laptops , printer , computor and will generate and receive data
Network architecture
Ensures connection of any device across network
Converged network
How much data you can put in Ip phone, video , voice , data
