Section 3.4 Networked Computer Systems

lynxfatkidneyedNetworking and Communications

Oct 26, 2013 (3 years and 8 months ago)

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Section 3.4

Networked Computer Systems

This research task covers 3.4.1 to 3.4.5 in the Computer Science guide.

Task:

Under each paragraph, provide bulleted notes that address each of the requirements
and

the
context sections. You may collaborate with your classmates but you must at the end of the exercise
have a full set of notes, written in your own words, that you understand. Do not, for goodness’ sake,
paste stuff directly from the web. Write with your
self as the audience
, so that when you read over these
notes, you will understand them
.
Make sure your notes are a different colour from the question text.
Use
bold
,
italic
,
underlining

and
highlighting

to make your text more readable and comprehensible.

U
se
pictures and diagrams
wherever

possible.

Time:

3 lessons. You should aim to have this work done by this time next week.

Reading ahead:

Data security and data integrity, 3.4.6 and 3.4.7 in the guide.

Requirement:

Define LAN, WAN, Server and Client.

Cont
ext:

Give an example of a LAN, where would you find one? What is the key difference between a
LAN and WAN? Why do we even distinguish between them? How is security affected by each? What are
WLANs and PANs? Is a server a piece of hardware or a piece of sof
tware? How many different types of
server can you name? What are your email server and clients called? What type of network has no
concept of server or client? Give an example.

Requirement:

Draw
the basic network topologies using the drawi
ng tools: star, b
us and hybrid.

Context:

For each, add a text box
explaining

advantages and disadvantages (ie Don’t just say “Good for
small networks.” You have to say
why
.)
Do this on a separate page
at the end of this document.
The best
piece of work will be enlarged and put on the wall.

Requirement:

Define hub, switch, and router, explaining the
role
of each.
Define node.

Context:

Find a hub in school. Find a router in your house. Compare hubs and switches in terms of
network t
raffic. They are very similar devices


why do we need both? Can’t we just always use hubs, or
always use switches?

Required:

What is a protocol in the context of computing?

Why do protocols exist?

Context:

The word protocol can also be used in the context

of human social interactions. How does its
meaning in this context relate to the its meaning in a computing context? In lots of computing acronyms
the P stand for protocol. Find and briefly define three such acronyms.
Use the words “header”, “payload”
and

“trailer” to describe data packets. Some protocols do not use trailers


how?
“Frames”, “datagrams”
and “segments” are three different types of packet. Find their associated protocols.

Required:

Define data security and data integrity. How are each affect
ed by the transmission of data
across a network?

Context:

What
are

the main piece
s

of hardware that
makes a LAN more secure than a WLAN? Why is
data security much more of an issue now than it was twenty years ago?