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LANs and WANsPM0801 - Huflit

Nhm thuyt trnh:

Trn Th QunPhng Diu XngNg ChTonNguyn V Hng Phng

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LAN - Local Area Network

LAN(Local Area Network) is a group

of computers and networking

devices connected together within alimited geographical region.

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LAN - HistoryAs larger universities and research labs obtained more computers duringthe late 1960s, there was an increasing pressure to provide high-speed

interconnections. A report in 1970 from the Lawrence Radiation

Laboratory detailing the growth of their "Octopus" network gives a good

indication of the situation.

Cambridge Ring was developed at Cambridge University in 1974 butwas never developed into a successful commercial product.

Ethernet was developed at Xerox PARC in 19731975, and filed as U.S.

Patent 4,063,220. In 1976, after the system was deployed at PARC,

Metcalfe and Boggs published a seminal paper, "Ethernet: Distributed

Packet-Switching For Local Computer Networks."

ARCNET was developed by Datapoint Corporation in 1976 and

announced in 1977. It had the first commercial installation in December

1977 at Chase Manhattan Bank in New York.

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WIDE AREA NETWORK

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TYPE OF WAN

CONNECTION

Leased Line

Circuit Switching

Packet Switching

Cell Relay

Wireless WAN

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ADVANTAGES AND DISAVANTAGES

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Difference Between LAN and WAN

Summary:

- LAN covers a small area while

WAN covers a significantly

larger area.

- LAN speeds are also

significantly faster than WAN.

- LAN is more secure than WAN.

- WAN is much more expensive

to implement than LAN.

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LAN WAN

Data transfer

rates:

LANs have a high data

transferrate

WANs have a lower data transfer

rate as compared to LANs

Connection: one LAN can beconnected toother

LANs over any distance

via telephone lines and

radio waves

Computers connected to a wide-area network areoften connected

throughpublic networks, such as

the telephone system.They can

also beconnected through leased

lines or satellites

Example: Network in anorganization can be a

LAN

Internet is the best exampleof aWAN

Difference Between LAN and WAN

LAN WAN

Set-up costs: If there is a need to set-

up a coupleofextra

devices on the network,

it is not very expensive todo that

In this case since networks in

remote areas have to beconnected

hence the set-upcosts arehigher

Definition: LAN (Local Area Network)

is a computer network

covering a small

geographic area, like a

home, office, schools, or

groupof buildings

WAN (Wide Area Network) is a

computer network that covers a

broad area (e.g., any network

whosecommunications links cross

metropolitan, regional, or national

boundaries over a long distance

LAN WAN

Maintenance

costs:

Because it covers a

relatively small

geographical area, LAN is

easier tomaintain at

relatively low costs.

Maintaining WAN is difficult

becauseof its wider geographical

coverage, and and is its

maintenancecosts.

Technology: Tend to usecertain

connectivity

technologies, primarily

Ethernet and Token Ring

WANs tend to use technology like

ATM, Frame Relay and X.25 for

connectivity over the longer

distances

LAN WAN

Geographical

spread:

Have a small

geographical range and

do not need any leased

telecommunication lines

Have a large geographical range

generally spreading across

boundaries and need leased

telecommunication lines

Ownership: Typically owned,

controlled, and managed

by a singleperson or

organization

WANs (like the Internet) are not

owned by any oneorganization but

ratherexist undercollectiveor

distributed ownership andmanagement over long distances

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LAN WAN

Data transfer

rates:

LANs have a high data

transferrate

WANs have a lower data transfer

rate as compared to LANs

Connection: one LAN can be

connected tootherLANs over any distance

via telephone lines and

radio waves

Computers connected to a wide-

area network areoften connectedthroughpublic networks, such as

the telephone system.They can

also beconnected through leased

lines or satellites

Difference Between LAN and WAN

LAN WAN

Set-up costs: If there is a need to set-

up a coupleofextradevices on the network,

it is not very expensive

to do that

In this case since networks in

remote areas have to beconnected hence the set-upcosts

arehigher

Definition: LAN (Local Area

Network) is a computer

networkcovering a smallgeographic area, like a

home, office, schools, or

groupof buildings

WAN (Wide Area Network) is a

computer network that covers a

broad area (e.g., any networkwhosecommunications links cross

metropolitan, regional, or national

boundaries over a long distance

LAN WAN

Maintenance

costs:

Because it covers a

relatively small

geographical area, LAN is

easier tomaintain at

relatively low costs.

Maintaining WAN is difficult

becauseof its wider geographical

coverage, and and is its

maintenancecosts.

Technology: Tend to usecertain

connectivity

technologies, primarily

Ethernet and Token Ring

WANs tend to use technology like

ATM, Frame Relay and X.25 for

connectivity over the longer

distances

LAN WAN

Geographical

spread:

Have a small

geographical range and

do not need any leased

telecommunication lines

Have a large geographical range

generally spreading across

boundaries and need leased

telecommunication lines

Ownership: Typically owned,

controlled, and managed

by a singleperson or

organization

WANs (like the Internet) are not

owned by any oneorganization

but ratherexist undercollectiveor

distributed ownership and

management over long distances

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NetworkTopologies

Bus Topology

Bus networks use a common backbone to connect all

devices

Ring Topology

Every device has exactly two neighbors for

communication purposes.

All messages travel through a ring in the same direction

Star Topology

Many home networks use the star topology.

A star network features a central connection point called a

"hub"

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Tree Topology

NetworkTopologies

Tree topologies integrate multiple star topologies together onto a

bus.

Mesh Topology

Mesh topologies involve the concept of routes.

Provides redundant communication paths between some or

all devices (partial or full mesh).