CS1001CS1001

Lecture 6Lecture 6

OverviewOverview

Homework 1Homework 1 Memory, Data StorageMemory, Data Storage Architecture ComparisonsArchitecture Comparisons Computer NetworksComputer Networks

GoalsGoals

Understand how information is Understand how information is stored in a variety of mediastored in a variety of media

Know tradeoffs between memory Know tradeoffs between memory typestypes

Examine how computer networks Examine how computer networks affect this memory hierarchyaffect this memory hierarchy

Goals (2)Goals (2)

Learn fundamentals of networkingLearn fundamentals of networking Examine network security issuesExamine network security issues

AssignmentsAssignments

Brookshear: Ch 2, Ch 3.5, 3.6, Brookshear: Ch 2, Ch 3.5, 3.6, 3.7 (Read)3.7 (Read)

Know factual material (bolded Know factual material (bolded terms) in 3.5, 3.6, 3.7terms) in 3.5, 3.6, 3.7

Read linked documents on these Read linked documents on these slides (slides will be posted in slides (slides will be posted in courseworks)courseworks)

Memory HierarchiesMemory Hierarchies

Every type of storage has pros/consEvery type of storage has pros/cons All digital storage represents data as All digital storage represents data as

a sequence of “on” or “off” values.a sequence of “on” or “off” values.– In Electrical Storage, Electricity (hi In Electrical Storage, Electricity (hi

voltage/no voltage) represents thisvoltage/no voltage) represents this– In magnetic storage, + and – polarities In magnetic storage, + and – polarities

represent thisrepresent this– In optical storage, reflect/absorb In optical storage, reflect/absorb

represent thisrepresent this

NetworksNetworks

Local Area Networks – (LANS)Local Area Networks – (LANS) Wide Area Networks – (WANS)Wide Area Networks – (WANS) An “Enterprise” NetworkAn “Enterprise” Network Distributed Storage/ProcessingDistributed Storage/Processing

Figure 3.10: Network Figure 3.10: Network topologiestopologies

Figure 3.10: Network Figure 3.10: Network topologies (continued)topologies (continued)

Figure 3.12: Figure 3.12: A typical A typical approach to approach to connecting to connecting to the the InternetInternet

Figure 3.13: A typical Figure 3.13: A typical URLURL

Figure 3.14: A simple Figure 3.14: A simple Web page expressed Web page expressed in in HTMLHTML

Figure 3.17: Package-Figure 3.17: Package-shipping exampleshipping example

Figure 3.18: The Figure 3.18: The Internet software Internet software layerslayers

Figure Figure 3.19: 3.19: Following a Following a message message through the through the Internet Internet (continued)(continued)

Figure 3.19: Figure 3.19: Following a Following a message message through the through the

InternetInternet

Figure 3.20: Choosing Figure 3.20: Choosing between TCP and UDPbetween TCP and UDP