CCNA Wireless Lan (WLAN)
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The document provides an overview of wireless LAN, covering its operations, security, and configuration, emphasizing the importance of mobility and connectivity. It discusses various wireless technologies, advantages of wireless networks, and outlines differences between wireless and wired LANs. Security measures against common wireless threats and methods for configuring wireless networks are also highlighted.
CCNA Wireless Lan (WLAN)
- 1. Copyright © www.networkel.com 4- Wireless LAN 4.1 Wireless LAN Overview 4.2 Wireless LAN Operations 4.3 Wireless LAN Security 4.4 Wireless LAN Configuration
- 2. Copyright © www.networkel.com 4.1 Wireless LAN Overview
- 3. Copyright © www.networkel.com WHYWENEEDWIRELESSNETWORK? • Today, mobility is very important • People want to connect to a LAN or internet from almost everywhere ( Home, cafe, stadium etc. ) • Solution : Wireless Network
- 4. Copyright © www.networkel.com BONUSSLIDE( PROMOTIONOFFER!) • To get our CCNA 200-125 Full Video Training with %90 discount click the link below now ! CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)
- 5. Copyright © www.networkel.com ADVANTAGESOFWIRELESS • Cost reduction (no cabling requirement) • Flexibility (location independent) • Productivity
- 6. Copyright © www.networkel.com WIRELESSTECHNOLOGIES • WI-FI : Network connection up to 7 Gbps (IEEE 802.11 Standards) • Blueetooth : Up to 14 Mbps transmission (IEEE 802.15) • Wi-MAX : Up to 50 km wireless broadband connection (Up to 1gbps) • Cellular Broadband : 3G, 4G • Satellite Broadband : Broadband from directional satellite dish
- 7. Copyright © www.networkel.com IEEE802.11WI-FISTANDARDS • Set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) communication.
- 8. Copyright © www.networkel.com WIRELESSLANvs WIREDLAN Characteristic 802.11 WLAN Ethernet LAN Physical Layer Radio Frequency (Very Low) Cable Media Access Collision Avoidance Collision Detection Availability Everybody in the range of AP Cable connection required Signal Interference Yes Inconsequential
- 9. Copyright © www.networkel.com WIRELESSNETWORKINTERFACECARDS • Provides wireless connection to Access to wireless networks
- 10. Copyright © www.networkel.com WIRELESSMODEM • Provides wireless broadband connection for home users over WI-FI
- 11. Copyright © www.networkel.com BUSINESSWIRELESSSOLUTIONS • Provides wireless LAN connection for corporate users • Autonomous AP : Access points are configured individually • Controller-Based AP : Access points are managed by a controller. Controller can provide a single configuration for multiple APs R1 SW1 PC2PC1 AUTONOMOUS OR CONTROLLER-BASED AP PC3 Laptop - 1 Laptop - 2 Laptop - 3
- 12. Copyright © www.networkel.com WIRELESSANTENNAS • Omnidirectional : Radiation cone is 360 degrees, working in all directions • Directional : Refers to signal coverage in a specified direction • Yagi : Used for moving Wi-Fi signals to longer distances (Directional)
- 13. Copyright © www.networkel.com 802.11TOPOLOGYMODES • Ad Hoc Mode : Direct wireless connection without an AP • Infrastructure Mode : Wireless connection with an AP Basic Service Area Extended Service Area
- 14. Copyright © www.networkel.com ADHOCMODE Laptop - 1 Laptop - 2
- 15. Copyright © www.networkel.com INFRASTRUCTUREMODE(BSA) Laptop - 1 Laptop - 2 • Basic Service Area • Number of APs : 1
- 16. Copyright © www.networkel.com INFRASTRUCTUREMODE(ESA) • Extended Service Area • Number of APs : 2 or more R1 SW2 PC2 PC3Laptop - 1 Laptop - 2 Laptop - 3 SW1 PC1
- 17. Copyright © www.networkel.com 4.2 Wireless LAN Operations
- 18. Copyright © www.networkel.com BONUSSLIDE( PROMOTIONOFFER!) • To get our CCNA 200-125 Full Video Training with %90 discount click the link below now ! CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)
- 21. Copyright © www.networkel.com CLIENT– ACCESSPOINTCONNECTION DISCOVER AP ( Active – Client must know SSID or Passive – AP advertises SSID AUTHENTICATE (Open authentication (no pw.) or Shared Keys ASSOCIATE
- 22. Copyright © www.networkel.com CONNECTIONPARAMETERS • SSID : Used as an identifier for a wireless LAN, and is intended to be unique for a particular area (Name of AP) • Security Key : Used for client authentication • Security Mode : WEP / WPA / WPA2 • Network Mode : 802.11a/b/g/n/ac/ad • Channel Settings : Frequency band
- 23. Copyright © www.networkel.com FREQUENCYCHANNELSATURATION • Frequency channels are used for communication between sender and wireless receiver devices • If channel is used so much by clients, it can saturate
- 24. Copyright © www.networkel.com FREQUENCYCHANNELSATURATION(cont) • To decrease the saturation ; Direct-sequence spread spectrum (DSSS) : Spread radio energy over a channel (802.11b) Frequency-hopping spread spectrum (FHSS) : Use the whole band in small intervals (802.11) Orthogonal Frequency-Division Multiplexing (OFDM) : Multiple transmissions simultaneously over a single channel (802.11a/g/n/ac)
- 25. Copyright © www.networkel.com 4.3 Wireless LAN Security
- 26. Copyright © www.networkel.com WIRELESSDOSATTACKS • DOS attacks are easily executed in a wireless network. • Emitting a very strong RF interference on the channel in which the wireless network is operating on will increase the noise on that channel and thus causing interference to all wireless networks that are operating at / near that channel
- 27. Copyright © www.networkel.com ROUGEACCESSPOINT • Access point that has been installed on a secure network without explicit authorization to capture client data or information such as MAC address
- 28. Copyright © www.networkel.com MANINTHEMIDDLEATTACK • Attacker secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other. • An attacker within reception range of an unencrypted Wi-Fi wireless access point can insert himself as a man-in-the-middle
- 29. Copyright © www.networkel.com HOWTOSECUREYOURWIRELESSNETWORK? • Use shared key authentication (WEP / WPA / WPA2) and encryption to secure your wireless network
- 30. Copyright © www.networkel.com 4.4 Wireless LAN Configuration
- 35. Copyright © www.networkel.com BONUSSLIDE( PROMOTIONOFFER!) • To get our CCNA 200-125 Full Video Training with %90 discount click the link below now ! CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)