Communication systems Flashcards
What are the two types of Client Server Models
Thin and Fat client
What is the difference between thin and fat clients
Thin client servers rely on a network connection for computing and don’t do much processing on the hardware itself. Whereas Fat clients don’t need a network connection and the users does most of the processing on the applications.
What is an advantage of Thin client
Faster than fat clients
what is and disadvantage of Thin clients
it doest not work offline
What are advantages of Fat client
Processing is done locally
Can work offline
What is the disadvanatage of Fat Client
it does not work properly if all the devices do not have the same version.
What are forms of Wireless transmissions
Microwaves
Satellite
Radio
Infared
Wifi
What are distances can each wireless transmission reach
Microwave: 150km
Satellite: 20,000 km
Infared: 30 m
Wifi: 100 m
What is Fat client
Fat clients are devices that connect to serverse for file and basic resources but do most of the processing themselves
What is Thin Client
Thin clients are devices which connect to servers which do most of the processing and the client only does data collection and displaying.
what is the client-server architecture
it describes the software relationship between the client (user) and the server.
what are the two forms of data
analog or digital
what is a wireless access point
it is a network decice that allows wireless-capabale devices to connect to a wired network
what is a modem
it is a device that allows devices to connect to the internet. It converts digital signals into analog signals that can be transmitted over telephone lines or cable networks.
What are network adminstrators
It is a person who manages a network within an organisation.
what are the tasks of a network administrator
include network security
installing new applications
distributing software upgrades
monitoring daily activitiy
enforcing licencsing agreements
developing a storage system
providing backup routines.
what is a network operating system
it is an operating system that is desinged primarily to support computers connected to a LAN
what are the tasks of a Network operating system
administration: adds, removes and organises users; installs hardware devices, software applications, carry out maintenance operations such as backups.
File management: gives users access to the remote hard disks on the server and provide a file system and the ability to manage a network directory
applications—handles requests from users to share data and applications
resource management—allows network devices, such as printers and modems,
to be shared; assigns users to printers; and orders print jobs
security—monitors and restricts access to network resources.
What is a logon and a password
Logon is the procedure used to get access to the network. A password is a security measure for logins.
what is an intranet
it is a private network that uses a similar interface to the Web. The main purpose of an intranet is to share information and computing resources among the exployees of an organisation. They provide access to the internet through firewalls
What Extranent
it is an intranet that is accesible to customers, suppliers or others outside the organisation.
What is the difference between Extranet, intranet and the internet
Intranets are private networks that are used by an organisation
Extranets are intranets that are only available to the customers
Internets is a network that connects all computers around the world for everyone to use.
What is main similiarity intranet, extranet and internet
they all access the web and have similar interface designs.
what is a bcc in a email
short for Blind carbon copy, it where a recipient receives a copy of the email without their name being visible to the other recipients
what is a cc in a email
short for carbon copy, is where a recipient recieves a copy of the email that is apart of the primary recipient.
what is the difference between a CC and BCC
A recipient of an email in the CC can be seen by the primary recipients and etc whereas a BCC is invisible from the other recipients.
what are the two methods of Checksum
Method 1: is to count the number of bits in the message and append that number to the end of a message.
Method 2: it is to count the numebr of “ 1’s “ in the message and append this number to the end of the message
What is cycle redudancy check
it is an error detection method technique that checks the data if it was one long number. It does this through a handshake process between both devices to agree upon a divisor. the data is divided by this number and the remainder is sent along with the data
what is analog data
is it data that is represented by using contionus variable of physical quantities such as voltages. On encoding and decoding graphs they are represented as waves.
What is digital data
it is data that is represented in the form of digits or numbers. On encoding and decoding graphs they are represented as either one or zero’s.
what are the four encoding and decoding possibilities in transmission
Analog data to analog signal
Digital data to analog signal
Digital data to digital signal
Analog data to digital signal
What is the POP protocol
also known as the Post Office Protocol. It is a protocol that specifies how email messages may be exchanged between a computer and the ISP
what is ISP
internet service provider
