Week 4 Flashcards
means communication at a distance
Telecommunication
refers to information presented in whatever form is agreed upon by the parties creating and using the ________.
Data
are the exchange of data between two devices via some form of transmission medium such as a wire cable
Data Communication
What are the 4 Characteristics for effective data communication system?
Delivery
Accuracy
Timeliness
Jitter
the system must deliver data to the correct destination. Where and how the data can be delivered.
Delivery
Where and how the data can be delivered.
Delivery
The system must deliver the data without error and accurately
Accuracy
Meaning the data will be delivered without any errors and flawless.
Accuracy
The system must deliver data in timely manner.
Timeliness
Data can be sent and received to its destination without any delays.
Timeliness
refers to the variation in the packet arrival time.
Jitter
refers to how long does it take for data will be arrived
Jitter
What are the 5 components of data communication system
Message
Sender
Receiver
Transmission Medium
Protocol
It is the information (data) to be communicated. E.g. text, numbers, pictures, audio, and video.
Message
is the device that sends the data message. E.g. computer, workstation, telephone handset, video camera.
Sender
is the device that receives the message. E.g. computer, workstation, telephone handset, television.
Receiver
it is the physical path by which a message travels from sender to receiver. E.g. twisted-pair wire, coaxial cable, fiber-optic cable, radio waves.
Transmission Medium
is a set of rules that govern data communication.
Protocol
A connection of 2 or more computers via communication channel for the purpose of sharing files and resources such as printers, scanners, cd rom and other peripheral devices.
Network
what are the network supports the way we live
- Decide what to wear using online current weather conditions.
- Find the least congested route to your destination, displaying weather and traffic video from webcams.
- Check your bank balance and pay bills electronically.
- Receive and send e-mail, or make an internet phone call, at an internet cafe over lunch.
- Obtain health information and nutritional advice from experts all over the world, and post to a forum to share related health or treatment information.
- Download new recipes and cooking techniques to create a spectacular dinner.
- Post and share you photographs, home videos, and experiences with friends or with the world.
What are the examples of todays popular communication tools
- Instant Messaging (online chat)
- Weblogs (personal web pages)
- Wikis (collaborative tool)
- Podcasting (pull audio files)
- Collaboration Tools (conferencing tools)
What are the “Network support the way we learn
- Online Instructional Materials
- Portals
- Collaboration Tools
What are the “Network support the way we work”
- Remote Access
- Multiple Resources
What are the “Network support the way we play”
- Online Games
- Online Entertainment
- Instant Messaging
- Online Travel
What are the elements of a network
Rules
Medium
Message
Devices
the most common device for interconnecting local area networks
Swtich
provides security to networks
Firewall
helps direct messages as they travel across a network
Router
a specific type of router often found in home networks
Wireless Router
used to summarize a group of networking devices, the details of which may be unimportant to the discussion at hand.
Cloud
one form of WAN interconnection, represented by the lightning bolt-shaped line
Serial Link
used physical cables to connect devices.
Wired Networks
use radio waves to communicate between devices.
Wireless Network
These are also connected to wire networks, at some point.
Wireless Network
Host/devices that are running in multiple network
Multiple
Multiple host/devices that are running in single network
Converge
services are running on multiple networks
Multiple
data networks carry multiple services on one network
Converge
increase priority for services like telephony or video distribution.
Time-sensitive communication
decrease priority for web page retrieval or e-mail.
Non time-sensitive communication
increase priority for production control or business transaction data.
High importance to organization
decrease priority or block unwanted activity, like peer-to-peer file sharing or live entertainment.
Undesirable communication
that prevents communications and transactions occurring, with consequent loss of business. Meaning some application in a single network prohibiting user to access it that may result loss of business/organization
Network Outage
If network security is weak, attackers may have an access to business/personal accounts that may lead to financial loss
Company Financial Loss
If your organization have weaker security, some of the confidential information of your company may expose to other
Intellectual Property Theft
______- and loss personal or business funds.
Misdirection
Customer contract details that become known to competitors or made public, resulting in a ______confidence in the business.
loss of market
What are the Quality Services
- The internet is currently providing an acceptable level of fault tolerance and scalability for its users.
- New applications available to users over internet works create higher expectations for the quality of the delivered services.
- Managing the delay and packet loss parameters on a network becomes the secret to a successful end-to-end application quality solution.
- Prioritize which types of data packets must be delivered at the expense of other types of packets that can be delayed or dropped.
- Classification
* Assign a precise priority for each type f communication.
* Assigning priorities
