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ISEM3410 Telecommunications and Networking in Business

ISEM3410 Telecommunications and Networking in Business . WiFi System in HKBU. Group 4 members: 11008660 Yau Oi Man, Rainie 11013427 Tong Shing Shan, Irene 11007931 Chap Yuen Kwan, Rachel 11009667 chan Lai Kwan Irene 12050148, DENG BO, Mark 12009113 Tam Yu Wai, Ecu

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ISEM3410 Telecommunications and Networking in Business

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  1. 1 ISEM3410Telecommunications and Networking in Business WiFi System in HKBU Group 4 members: 11008660 YauOi Man, Rainie 11013427 Tong Shing Shan, Irene 11007931 Chap Yuen Kwan, Rachel 11009667 chan Lai Kwan Irene 12050148, DENG BO, Mark 12009113 Tam Yu Wai, Ecu 13508490 Wang Hyerim, Emily

  2. 2 What is WiFi?

  3. 3 What is WiFi?(1/4) • Wi-Fi = "wireless fidelity" • Wireless networking technology • wireless internet and network connections • using radio waves

  4. What is WiFi?(2/4) 4 The Wi-Fi Alliance • Define as any “wireless local area network” (WLAN) • based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards.

  5. 5 What is WiFi?(3/4) • Commonly used and supported by many applications and devices

  6. 6 WiFi in HKBU (4/4) infrastructure? challenges and difficulties? Difference among different WiFi? Security?

  7. 7 WiFi infrastructure

  8. 8 WiFi infrastructure in HKBU Campus(1/8) HARNET Internet HKBU Server RADIUS Switch (PoE) Router (AP) Router (AP) Router (AP) Router (AP) Desktop Computer with PCI wifi card/wifi USB Adapter Notebook Netbook Mobile Device

  9. 9 Components of WiFi infrastructure(2/8) • Router • A computer networking device • Connected to two or more data lines from different networks • Performs the “traffic directing” functions on the internet.

  10. 10 Components of Wifiinfrastructure(3/8) • Access Point (AP) • Usually connects to a router as a standalone device, but it can also be the router itself • Allows wireless devices to connect to a wired network • About 1,800 APs in Kowloon Tong Campus • Hidden in the ceiling or in containers • Connected by twisted pair cable to switch

  11. 11 (4/8) An access point in a plastic box located in ITO office

  12. 12 Components of Wifi infrastructure(5/8) • Network Switch • Connects devices together on a computer network physically • Multiple cables can be connected to a switch • Power over Ethernet (PoE) • Describes any of several standardized or ad-hoc systems which pass electrical power along with data on Ethernet cabling • Less expensive and more convenient

  13. 13 Components of Wifiinfrastructure(6/8) • Remote Authentication Dial-In User Service (RADIUS) • Authenticate users and authorizes access • An accounting system used by Internet Service Providers (ISPs) • When a user dials in to the ISP, the user must provide the username and the password • Information is passed to the RADIUS server • If the identification is verified-> authorizes access to the ISP’s network • Eg. BU-Standard: Student id, password

  14. 14 Components of Wifiinfrastructure(7/8) • The Hong Kong Academic and Research NETwork(HARNET) • The wide area network which links up the campus networks of the eight tertiary institutions in Hong Kong • Under the management of the Joint Universities Computer Centre (JUCC) • An advanced network infrastructure to facilitate the exchange of information

  15. (8/8) 15

  16. 16 The comparisons of different WiFis of HKBU

  17. 5 Others 17 Different WiFis of BU(1/9) 1 BU Standard 2 BUSRH 3 BU Web 4 BU Guest

  18. 1 BU Standard 18 (2/9) Target Users Characteristics Location Staff and students Campus buildings and public areas • Secured connection by 802.1x authentication • Connected to HARNET • Fast and stable connection • 1,800 AP in Kowloon Tong Campus

  19. 2 BUSRH 19 (3/9) Characteristics Target Users Location Staff and students Student Halls • 802.3 authentication • only available in Student Hostels • Provided by a different ISP, HKBN • 1st and 19th floor are connected to HARNET • 10 Aps per floor

  20. 20 (4/9) Hall way

  21. 3 BU Web 21 (5/9) Characteristics Target Users Location Staff and students Campus buildings and public areas • Authentication via web login • Restricted to web browsing and email • Used only if 802.1x is not supported by users’ devices • Currently not used (replaced by BU Standard)

  22. 4 BU Guest 22 (6/9) Characteristics Target Users Location Visitors Campus buildings and public areas • Login ticket (issued by ITO) is required • Requires money to buy the ticket

  23. 23 The Comparison of Different Wifis (7/9)

  24. 5 Others 24 (8/9) PCCW For Customers of PCCW and BU students How to use PCCW with BU student ID

  25. Eduroam, UniversitiesWiFi 25 (9/9) For Visitors from local and international educational institutes Y5ZONE For Customers of Y5ZONE and University students

  26. 26 Security Measure

  27. 27 - encodes the data sent wirelessly between your device and the routerType of encryption:1. Wired Equivalent Privacy (WEP)- option for older routers and equipment- outdated!!2. Wi-Fi Protected Access (WPA & WPA2)- more common advanced security protocols- encryption keys they use change each time a device accesses the network, making it more difficult to hack than WEP (1/8) • ENCRYPTION

  28. 28 WiFiencryption in HKBU(2/8) • Security measures when choosing wifi access: BU- Guest; BU-Web Why are there two type of wifisecurity standard? BU-Standard; BUSRH

  29. 29 When you choose …. (3/8) • - You need to type ID (identity) and Password • to verify your identity • - Then your request will be transmit to RADIUS • for checking • RADIUS servers checked the user's information against a locally stored flat file database • RADIUS (Remote Authentication Dial In User Service) • A networking protocol of: • authentication • authorization • accounting

  30. 30 Digital Certificate(4/8) • it is a digital identifier used to authenticate a machine or user to a network • it contains information about who owns the certificate, certificate issuer, a unique serial number or other unique identification, expiration dates, and encrypted information that can be used to verify the information held within the certificate • Function: • - to authenticate and associate with access points (APs) or broadband Wi-Fi routers. APs and routers then connect to the Internet via a DSL, cable or other types of modems. • How it works: • - A certificate authority (CA) is an authority (security server) in a network, or a third-party entity, that issues and manages security credentials and public keys for message encryption and decryption. As part of a public key infrastructure (PKI), a CA checks with a registration authority (RA) to verify information provided by the requestor of a digital certificate.

  31. 31 Certificate of Bu-standard(5/8)

  32. 32 (6/8)

  33. 33 When transmitting info to internet…(7/8) No encryption when the information pass through controller People can easily get what you are searching online! How to protect privacy????

  34. 34 The answer is… HTTPS!(8/8) • HTTPS (Hypertext Transfer Protocol Secure) • a communications protocol for secure communication over a computer network • provides authenticationof the web site and associated web server that one is communicating with, whichprotects against man-in-the-middle attacks • providesbidirectional encryptionof communications between a client and server, which protects against eavesdroppingandtamperingwith and/or forging the contents of the communication. • guarantee user is communicating with precisely the web site that is intended to communicate with • ensure that the contents of communications between the user and site cannot be read or forged by any third party.

  35. 35 Potential Problem

  36. 36 (1/6) Overlapping

  37. 37 About overlapping(2/6) • Channels range • UK: 2.400 GHz and 2.497 GHz This is subdivided into 13 channels of 25 MHz • US: Just 11 of those channels are available • Overlapping High-incidence area: • Between adjacent bands

  38. 38 Visualization of channels and overlapping situation(3/6)

  39. 39 Signalstrength(spread)(4/6) • Different medium: • Concrete wall • Wood • Glass

  40. 40 Signal strength(spread)(5/6) • The Distance • For instance : different rooms in residence hall holds different Wi-Fi Signal strength. It depends on the distance between user and APs

  41. 41 Safety(6/6) • Access points and routers all use a network name called the SSID(Service Set Identifier) And usually it’s a Default SSID • Public free Wi-Fi : exposes your computer to security risk (Hackers)

  42. 42 Conclusion • Digital and Internet generation • Wifi system  Essential • Provide high speed and stabile WiFi • Improving the teaching and learning environment

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