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A local area network is: A. An exclusive social club. B. A group of computers, usually in a single building, connected by cables.
Typology: Study notes
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A local area network is:
A. An exclusive social club.A. An exclusive social club.B. A group of computers, usually in a
single building, connected by cables.
g
g,
y
C. Local television affiliates of the big
networks.
A local area network is:
A. An exclusive social club.A. An exclusive social club.B. A group of computers, usually in a
single building, connected by cables.
g
g,
y
C. Local television affiliates of the big
networks.
∗
HW1 and Lab 2HW1 and Lab 2
Student tab in the CS paneStudent tab in the CS pane
St
d
t^
h
d th
t RAM i
∗
St
udents who answered that RAM is measured in MB
or
GB will receive
credit for that questioncredit for that question.
available within a couple hours after
p
each lecture^ ∗
Linked at top of Calendar on theLinked at top of Calendar on the^ course Web site
More than just a social interaction
© 2004 Lawrence Snyder
Computers are useful alone, but are
better when connected (networked)
∗
Access more information and softwarethan is stored locally
y
∗
Help users to communicate, exchangeinformation … changing ideas aboutsocial interaction ∗
Perform other services -- printing, Web,...
UW’s networks move more than trillion bytes per day
Networks are structured differently
based (mostly) on how far apart the
y)
p
computers are^ ∗
Local area network (LAN)
-- a small
Local area network (LAN)
a small
area such as a room or building ∗
Wide area networks (WAN) -- large
(^
)^
g
area, e.g. distance is more than 1 Km Internet: all of the wires, fibers, switches, Internet: all of the wires, fibers, switches, routers etc. connecting named computers
Network Type
Differentiating Factors
Peer-to-Peer
-^ No computer running server software
Server-Based Networks
-^ Computer running server software
p^
g
manages network traffic
-^ Local Area Network (LAN) -^ Limited geographical area •^
One-time capital cost (wire or fiber optics cable installation)
-^ Wide Area Network (WAN) -^ Across town or across the globe • Third-party service provider (monthly $$)More band
idth
more e pense
-^ More
band
width = more expense
-^ Connects to LANs with a router -^ Campus Network -^ One-time capital expense • Buildings in close proximity•Buildings in close proximity -^ Metropolitan Area Network(MAN) -^ Clusters of buildings in close proximityseparated from other clusters • Third-party service provider (monthly $$)
11
EtherNet is a popular LAN protocol
p
y^
p Typical MGH or OUGL Lab
Connection to campusnetwork infrastructure
PC
PC
PC
PC
PC
PC
Ether NetCable Cable
The campus subnetworks interconnect
computers of the UW domain whichconnects to Internet via a gateway
Switch
Homer
MGH
Switch Gate
Dante
Student
CS
Gateway
washington edu
All communication by TCP/IP
Student
CS
Switch
washington.edu
A packet sent from UW to ETH (Swiss
Fed. Tech. University) took 21 hops
y)
p
UW Gateway
Packet-SwitchingAnimationAnimation
People name computers by a domain
name -- a hierarchical scheme thatgroups like computers
.edu
All educational computers
.washington.edu
All computers at UW
dante.washington.edu A UW computerischool washington edu
iSchool computers
.ischool.washington.edu
iSchool computers
.cs.washington.edu CSE computers
june.cs.washington.edu
A CSE computer
Peers
june.cs.washington.edu
A CSE computer
Domains begin with a “dot” and get “larger” going right
Computers are named by IP address,
four numbers in the range 0-
cse.washington.edu: 128.95.1.4ischool.washington.edu: 128.208.100.150R^
b
i^
IP
dd
ld b
∗
R
emembering IP addresses would be brutal for humans, so we use domainsC
t^
fi
d th
IP
dd
f
∗
C
omputers find the IP address for a domain name from the
Domain Name
System
-- an IP address-book computer
System
an IP address
book computer
A computer needs to know IP address of DNS server!
