BIT 4554 Study Guide - Comprehensive Midterm Guide: Arpanet, System Administrator, Simple Mail Transfer Protocol

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BIT 4554
MIDTERM EXAM
STUDY GUIDE
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Networks and Telecommunications in Business - Chapter 1 (Class 2)
Growth of Computer Networking
Computers have been part of business infrastructure since
1970’s
o 1980 internet was a research project with a few sites
Dramatic economic shifts
o People can now telecommute
o Business communication changed
o New industry involving networking tech, products,
services
Used in every aspect of business
Why Networking Seems Complex
Video started with telegraph
Many technologies exist
Tech can be combined and interconnected in many ways
Commercial network products are often created by using
technologies in new unconventional ways
5 key aspects of networking
network applications ad network programming
data communications
packet switching and networking technologies
internetworking with TCP/IP
Additional Networking Concepts and Technologies
Network Applications and Network Programming
Network services are provided by application software(s)
Network applications may include
o Email
o File transfer
o Web browsing
o VoIP
o Distributed databases
o Skype
A Unified underlying network that supports all applications
makes a developer’s job much easier
It is possible to design network applications, & write code that
communicates over a network, without understanding the
hardware/software technologies
Data Communications
Low-level mechanisms and technologies used to send
information across a medium ex. A wire, radio wave, or light
beam
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Networks and Telecommunications in Business - Chapter 1 (Class 2)
Focuses on ways to use physical phenomena
(electricity, light, etc.) to transfer information
Packet Switching
Revolutionized data communications
Before packet switching ex. Telephone, had to form a
dedicated circuit only few could use at one time
Provided basis for the modem internet
Divides data into small blocks called packets
Allows multiple users to share a network
Each packet includes identification of the intended recipient
Packet Switching and Network Technologies
packet switching technologies have been created to meet
various requirements for speed, distance, and cost
Questions to answer:
o How should a destination be identified?
o How can a sender find the identification of a
destination?
o How large should a packet be?
o How can a network recognize the end of one packet?
o How can a network recognize the beginning of another
packet?
o If a network is shared, then how can they coordinate to
insure that each receives a fair opportunity to send?
Internetworking
Internet most revolutionary invention of the 70’s
Public and Private Parts of the Internet
Public network service providers run it as a service available
to subscribers
private network is controlled by one particular group -
network use is restricted to one group
Networks, Interoperability, and Standards
Communication always involves a Sender and Receiver
All entities in a network must agree on how information will
be represented and communicated
All communicating parties agree on details and follow the
same set of rules - Communication protocol or network
protocol
Internetworking with TCP/IP
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