Show:
Intro to Communication Systems
Characteristics of Communication Systems
Examples of Communication Systems
Transmitting and Receiving in Communication Systems/Issues related to Communication Systems
Networks and Network Software/Other Information Processes/ Current & Emerging Trends
100
True or False – The message is encoded and decoded in the transmission level.
False- Control and Addressing Level
100
Define- ‘Protocol’
This defines the format and meaning of the information that the computers exchange. It describes standards for parameters such as speed of transmission, transmission mode, handshake, parity, error detection and correction.
100
True or False- VoIP stands for ‘Voice over Internet Program’
False- Voice over Internet Protocol
100
Define- ‘Netiquette’
Proper or ethical behaviour on the Internet when posting messages, interacting with newsgroups or talking in chat rooms
100
To encode analog data into a digital signal requires the data to first be converted into a digital signal using a ___________ ____ _______________ __________________.
Analog to digital converter -ADC
200
Describe the role of the TCP and TCP/IP in a network
Ensure that each data packet is delivered to its correct destination
200
True or False- Handshaking is used to establish a communication channel for senders.
False- Handshaking is used to establish a communication channel for senders and receivers
200
Recognise and name the 4 main fields which can be found in an email header.
To: The recipient/s email address/es. Subject: A brief description of what the message is about. Cc- Carbon Copy, which means that identical copies of the email will be sent to any email addresses entered here. The addresses will be visible to others. Bcc- Blind carbon copy, same as Cc except these addresses will be hidden
200
True or False- ‘Optic fibre can transmit faster and is more reliable but is expensive to make and repair’.
True
200
Define ‘Podcast’
A podcast is a digital-media RSS feed that is downloaded to a computer and copied to an MP3 player
300
Identify the 3 levels of protocols in the communication systems model?
Application level, Control and Addressing Level and Transmission level
300
Packet switching is the process of ___________________ and ______________________ data in packets, directing each packet along the most appropriate route at the time of transmission.
routing and transferring
300
Define ‘Teleconferencing’
Teleconferencing is a method whereby people in different geographical locations can have a real-time meeting using computers and communication systems
300
The _____________ _________________ _______________ system uses a network of satellites that orbit the earth to form a complete grid.
Global Positioning System
300
Identify 4 tasks that a network administrator performs in a network
Adding/removing users, assigning users to printers, giving users file access rights, installation of software and sharing with users, client installation and protocol assignment, logon and logoff procedures & network based applications
400
Define- ‘ Transmission Media’
The material through which data passes to get from one place to another. These may include cables (of various kinds) and/or wireless.
400
Identify CSMA/CD and explain its role in Ethernet.
Carrier Sense Multiple Access with Collision Detection. Its role is to deal with collisions when messages are sent at the same time.
400
The process of converting images and sound into binary numbers is called ___________________
Digitisation
400
There are two different types of computers on the network: _________________ and ______________.
Clients and Servers
400
Describe and explain data packets and its structure
A packet is a group of binary digits containing data and control characters that form part of a digital message. Each data packet consists of: A header (destination, source, number of packets sent, packet identifier and information about data), The data and a Trailer or error-checking code.
500
Recognise and name 3 protocols that take place in the application level
HTTP: For webpages, to establish connection with a html server SMTP: For emails, to allow connection to the e-mail server FTP: For direct file transfer from one computer to another, regardless of operating system being used SSL: Secure Socket Layer: For e-commerce, applies encryption of the data using a public key to ensure that the message cannot be read or tampered with by unauthorised agents)
500
Describe how parity checking works as a error-checking method
Originating computer counts the number of 1s in each transmitted byte and determines whether there is an odd or even number. The eighth bit in the byte is then used to produce a byte with an even number of 1s if even parity is set or with an odd number of 1s if odd parity is set in the protocol governing the particular communication session.
500
Describe and compare the ‘Internet’ and the ‘World Wide Web’
Internet: Public network based on the Internet Protocol where all data moves between computers at various places around the world. No single authority that controls the Internet overall. World Wide Web: Stores information in multimedia forms.
500
Explain how ‘Globalisation’ is both a positive and negative for communication systems
Companies can benefit by trading with partners across the world, but smaller agents and communities may feel disempowered by this.
500
To ensure that highly sensitive data is secure for transmission over a network is must be ___________________ and _____________ with the use of a _______.
encrypted and decrypted, key