it 240

8/8/2019 IT 240

1/13

8/8/2019 IT 240

2/13

The D eployment Sc enario

y W e can us e an Infrastructur e wh e re th e WLANdev ice s conn e ct to a wir e d corporat e n e twork

through a wir e le ss acc e ss point.y M ost corporat e wir e le ss LANs op e rat e in

infrastructur e mod e and acc e ss th e wir e d n e twork for conn e ctions to print e rsand fil e se r ve rs.

2

8/8/2019 IT 240

3/13

Common N etwork ComponentsCommon N etwork Components In c ludeIn c lude

y P e rsonal comput e rs(P Cs)

y Switch e sy Rout e rs

y Acce ss pointsy Rout e rsy Conn e ctorsy Int e rconn e ctions

which also includ e Ne twork int e rfac e cards (NICs)

Hardwar e Compon e nts3

8/8/2019 IT 240

4/13

Topology

y P hysically star,logically bus

y Star topology is e asy to conn e ct nod e s andoth e r d ev ice s

y Easy to s e p up n e w us e rs

4

8/8/2019 IT 240

5/13

O pen S ystems Inter Conne c tion ( O S I)O pen S ystems Inter Conne c tion ( O S I) Layer : A ppli cationLayer : A ppli cation

Consists of application

programs that use

the

network

Th e 7 Lay e rs ex plain e d5

8/8/2019 IT 240

6/13

Layer : P resentationLayer : P resentation Layer : S essionLayer : S ession

Standardiz e s data

pr e se ntation to th e applications that us e th e n e twork.

Th e se dev ice s alsopro v id e an int e rfac e be tw ee n th e Lay e r 2dev ice and th e physicalm e dia.

y M anag e s se ssions

be tw ee n applications.y This lay e r e stablish e s

dialog control b e tw ee n th e two comput e rs in ase ssion, r e gulating whichsid e transmits, and wh e nand how long it transmits.

Th e 7 Lay e rs ex plain e d continu e d.6

8/8/2019 IT 240

7/13

Layer : TransportLayer : Transport Layer : N etwork Layer : N etwork

y This handl e s e rror

re cognition and r e co ve ry.y It also r e packag e s long

m e ssag e s wh e n n e ce ssary into small pack e ts fortransmission

y R e builds pack e ts into th e original m e ssag e .

y M anag e s conn e ctions

across th e n e twork for th e Upp e r Lay e rs.


8/8/2019 IT 240

8/13

Layer : D ata L ink Layer : D ata L ink Layer :P hysi calLayer :P hysi cal

y P ro v id e s r e liabl e data

de li ve ry across th e physical link.


y De fin e s th e physical

charact e ristics of th e n e twork m e dia.

y R e gulat e s th e transmission of a str e amof bits o ve r a physicalm e dium.

8/8/2019 IT 240

9/13

IP N etwork A ddressing

y IP addr e ss e s ar e us e d toid e ntify th e location of sp e cific d ev ice s on an e twork so that data can

be se nt corr e ctly to thos e locations.

y IP addr e ssing has v arious

asp e cts, including th e calculations forconstructing an I P addr e ss

y th e class e s of I P addr e ss e sde signat e d for sp e cificrouting purpos e s, andpublic ve rsus pri v at e IP

addr e ss e s.

9

8/8/2019 IT 240

10/13

8/8/2019 IT 240

11/13

Fir e wall11

WatchGuard WG5 0 753 75 000 Simultan e ous S e ssions Fir e wall Syst e m

Stateful Packet Firewall

Deep Application Inspection Firewall

Spyware Blocking

Application Proxies - HTTP, SMTP, FTP, DNS, TCP

8/8/2019 IT 240

12/13

A CCE SS CO N T R O L/ F I L T E R I NG

W I R E D EQU IV AL E N T PR IV A CY (W E P )

A U TH E N TI C A TI O N

Th e Se curity P olicy 12

8/8/2019 IT 240

13/13

R e f e re nc e s

A x ia Coll e ge of Uni ve rsity of P ho e ni x . (2 00 7). Local Ar e a N e tworks. P ublish e d by P re ntic e- Hall. WAN and R e mot e Acce ss T e chnologi e s. Chapt e r 5. R e tri eve d M ay 16,200 9, from A x ia Coll e ge , W ee k thr ee re ading, aXc e ss, IT 24 0 Intro to LAN T e chnologi e s Cours e W e b sit e .

A x ia Coll e ge of Uni ve rsity of P ho e ni x . (2 00 7). Disast e r P reve ntion and R e co ve ry. R e tri eve d M ay 17 200 9, from A x ia Coll e ge , W ee k e ight r e ading, aXc e ss, IT24 0 Intoto LAN T e chnologi e s Cours e W e b sit e .

Cisco (2 00 9) Int e raction B e tw ee n OSI M od e l Lay e rs. R e tri eve d on M ay 22, 2 00 9 fromhttp://www.cisco.com/ e n/US/docs/int e rn e tworking/t e chnology/handbook/Intro - to - Int e rn e t.html#wp 10 20 627

Cisco ( 2 00 9) N e twork M anag e m e nt Introduction. Information r e tri eve d on M ay 16 , 2 00 9 from http://www.cisco.com/ e n/US/products/sw/n e tmgtsw/Cisco. L Sysadmin ( 2 00 9) Th e Int e rn e t P rotocol Journal - V olum e 6, Numb e r 4. Low - te ch N e twork M aint e nanc e was r e tri eve d from

http://www.cisco.com/w e b/about/ac 123/ac 147/archi ve d_issu e s/ipj_6 - 4/low_t e ch_n e twork_maint e nanc e .html on M ay 23, 2 00 9.

Cisco ( 2 00 9) I P Addr e ssing and Sub n e tting for N e w Us e rs. Docum e nt ID: 13788. Information was r e tri eve d fromhttp://www.cisco.com/ e n/US/t e ch/tk365/t e chnologi e s_t e ch_not e0 9186a 00 8 00 a67f5.shtml

Ne w e gg (n.d.) It e m#:N82E 16833 12001 4 N e tworking P roducts 1. Wir e le ss Rout e rs2. Cisco Syst e ms information was r e tri eve d fromhttp://www.n e w e gg.com/ P roduct/ P roduct.asp x? It e m=N82E 16833 12001 4

Te ch - FAQ (2 00 9) What is th e OSI M od e l? . R e tri eve d M ay 23, 2 00 9 from http://www.t e ch - faq.com/osi - mod e l.shtml

Th e pictur e was r e tri eve d on M ay 24 from http://www.tromp e te r - ita.com/uploads/m e dia/consulting.jpg for slid e 1 Th e pictur e was r e tri eve d on M ay 24 from http://www.mobis.com.tw/imag e s/products/SW -01 /sd - wlan_application.jpg for slid e 2

Th e pictur e was r e tri eve d on M ay 24 from http://www.omnitron - syst e ms.com/imag e s/products/m e tro_star_larg e .jpg for slid e 4Th e pictur e was r e tri eve d on M ay 24 from http://catalyst.washington. e du/h e lp/computing_fundam e ntals/n e tworking/img/osi_mod e l.jpg slid e 5Th e pictur e was r e tri eve d on M ay 24 from http://www.ac e gain.com/imag e s/diagrams/lay e r7diagram.jpg slid e 5Th e pictur e was r e tri eve d on M ay 23 from http://www.n e w e gg.com/ P roduct/ShowImag e .asp x? Imag e =33 -1 20-0 66 -01 .jpg&CurImag e =33 -1 20-0 66 -

01 .jpg&Wat e rM ark= 1&Ite m=N82E 16833 1200 66&D e scription=CISCO%2 0 Catalyst%2 0 375 0 %20 WS - C3750- 48TS -E%2 010 %2F 100 M bps%2 0 %2B%2 01000 M bps%2 0 Switch%2 0- %20 R e tail for imag e in slid e 8

Th e pictur e was r e tri eve d on M ay 24 from http://www.zant e ch.n e t/img/ e cms4 000- diagram.jpg for slid e 9Th e pictur e was r e tri eve d on M ay 24 from http://imag e s.inmagin e .com/img/w e st e nd6 1 /ws e s0 28/ws e s0 28 0 26.jpg pictur e for slid e 10

13

it 240

Documents