CEH.V6.-.Module.20.Hacking.Wireless.Networks

9 mbps when tcp transmission control protocol is used

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Unformatted text preview: eds of upto 11 mbps Actual speeds depend on implementation: • 5.9 mbps when TCP (Transmission Control Protocol) is used (error checking) • 7.1 mbps when UDP (User Datagram Protocol) is used (no error checking) It can transmit upto 8 kms in the city EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Wireless Standard: 802.11b – “WiFi” (cont’d) (cont 802.11b 802.11b – “WiFi” is not as easily absorbed as WiFi 802.11a signal It can cause or receive interference from: • Microwave ovens (microwaves in general) • Wireless telephones • Other wireless appliances operating in the same frequency EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Wireless Standard: 802.11g 802.11g operates at the same frequency range as 802.11b It has theoretical throughput of 54 Mpbs Actual transmission rate is dependent on several factors, but averages 24.7 mbps Logical upgrade from 802.11b wireless networks – backwards compatibility It suffers from same limitations as 802.11b network System may suffer significant decrease in network speeds if network is not completely upgraded from 802.11b EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Wireless Standard: 802.11i 802.11i is a standard for wireless local area networks that provides improved encryption for networks that use the popular 802.11a, 802.11b & 802.11g standards The 802.11i standard was officially ratified by the IEEE in June, 2004 Security is made up of three factors: • 802.1x for Authentication (EAP and Authentication Server) • Robust Security Network (RSN) to keep track of associations • Counter-Mode/CBC-Mac Protocol (CCMP) to provide confidentiality, integrity, and origin authentication EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Wireless Standard: 802.11n Th 802 The 802.11n standard, which will be based on multiple-in/multiple out (MIMO) technology, is expected to boost throughput to potentially well over 100 Mbps EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Wi Wireless Concepts and Devices EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Related Technology and Carrier Networks Networks CDPD: Cellular Digital Packet Data (TDMA) 1xRTT on CDMA (Code Division Multiple Access): Mobile phone carrier networks GPRS: General Packet Radio Service on GSM (Global System for Mobile Communications) FRS (Family Radio Service) and GMRS (General Mobile Radio Service): Radio services HPNA (Home Phone Networking Alliance) and Powerline Ethernet: Non-traditional networking protocols 802.1x: Port security for network communications BSS (Basic Service Set): Access point ~ bridges wired and wireless network IBSS (Independent Basic Service Set): Peer-to-peer or ad-hoc operation mode EC-Council Copyright © by EC-Council All Rights Reserved. Reproduction is Strictly Prohibited Antennas Antennas are important for sending and receiving radio waves They convert electrical impulses into radio waves and vice versa There are two types of antennas: • Omni-directional antennas • Directional antennas Can antennas are also popular in the wireless c...
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