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INSY 3303 EXAM 1 QUESTIONS AND ANSWERS
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INSY 3303 EXAM 1 QUESTIONS AND ANSWERS
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INSY 3303 EXAM 1 QUESTIONS AND ANSWERSThree basic components of a network: - Answers- A server, client, and a circuit.
What is a client? - Answers- Is the inout-output device at the user end. (I.E. clients
computer)
What is a circuit? - Answers- It is the pathway through which a message (data) travels.
Think everything in-between the server and client, connects them together.
What is a server? - Answers- Typically servers provide some service for the clients.
(data access, application logic, etc)
Types of networks: - Answers- LAN(local area network) - is a group of computers
located in the same general area.
Backbone Networks - larger, central networks connecting several LANs, other BNs, and
WANs. Typically span 100's of feet to several miles.
specifies the type of connection and the signals/radio waves/or light waves that pass
through it.
Role is to transfer series of signals through the circuit.
Data Link Layer - Answers- responsible for moving a message from one computer to
the other in the network path (sender to receiver).
Controls physical layer by deciding when the physical layer will transmit messages.
formats messages by indicating where they start and end.
detects and may correct errors that occurred during transmission.
Network Layer - Answers- Performs routing, selects the next computer to which the
message should be sent.
finds the address of the computer (receiver) if it is unknown
Transport Layer - Answers- Responsible for linking the application layer software to the
network and establishing end to end connection between the sender and receiver.
responsible for breaking long messages into several smaller ones, and then
reassembling them into the original one at receiving end.
Application Layer - Answers- It is the users access to the network.
, user defines what messages are sent over the network.
Layer PDUs - Answers- 1. application layer - HTTP packet
2. transport layer - TCP segment
3. network layer - IP packet
4. datalink layer - Ethernet frame
Pros and Cons of layers - Answers- 1. easy to develop new software
2.ensuring the software used at different layers is the same
3. It is somewhat inefficient because of encapsulation.
protocol stack - Answers- set of software used to understand the different protocols
Application Architecture - Answers- the way in which the functions of the application
layer software are spread among clients and servers in the network
(Client-Server Arch, P2P, etc)
Application Layer Functions - Answers- 1. Data Storage - data storage and retrieval
2. Data Access Logic - the processing required to access the data (database queries)
3. Application Logic -simple or complex depending on the application
4. Presentation Logic - the presentation of information to the user and acceptance of the
users commands.
WAN(wide area networks)- connect BNs and MANs (metropolitan area networks).
typically span hundreds or thousands of miles.
Intranets- Is a LAN that uses the same technology as the internet but is only available to
those inside the organization
Extranets- Use the same technology as the internet, but provided to invited users
Two most important network models: - Answers- OSI (open systems interconnection
reference)
Internet model
Internet Model - Answers- Most commonly used model of the two. Its the network
model that dominates current hardware and software.
Simple five layer
Collapses the top three layers of the OSI model into one layer. ( application layer,
presentation layer, and session layer collapses down into the application layer.)
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