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ITM 301 - Notes (Lesson 6)

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Information Technology Management
ITM 301
Farid Shirazi

1. Chapter 5 Final Notes 2. Review Midterm LAN Technology Around (100m, 1G/s) CSMA/CD carrier sense multiple access / Collision detected = 802.3 a. Token Ring = Collision Free = 802.5 a. If ring is broken, all connections are broken. b. But collision won’t occur, data is sent through a ring. c. 60,000 loops per second. b. Bus topology = Collisions a. If data is sent from both sides, collision may occur. c. Hub topology =looks like a spider. a. Divide bandwidth(speed) evenly b. Divide bandwidth evenly to all users. c. Layer 1 device. d. Switch will divide bandwidth depending on active users. a. Dynamic (depending on whos on) b. Layer 2 device CSMA/CA Carrier Sense multiple access/collision Avoidance 802.8 (“8” is usually fiber optic) a. FDDI = Fiber distributed data interface (*~ Note Circle within a circle) a. Each workstations are connected to two fiber optic cables. b. Data travels through outer ring, if outer ring is broken, data shifts to inner ring which goes in the opposite direction. Connection Backup (Redundancy) a. Fiber distributed data interface is faster than token ring. Metropolitan Area Network (kilometers, 10g/s) a. SONET Topology ( Synchronous optical net): (*~ Multiple FDDI models that are connected) a. High speed WAN Topology (Mesh Topology)(*~ Visual note, a grid chart. Each cross contains a node “aka a router”) Multiple paths to take in terms of sending data (Fault tolerance) Wireless topology 802.11a,b,g,I and Wimax All of the 802.11 are baseband 802.11a: 1. 5GHz Frequency 2. 54m/s Speed 802.11b: 1. 2.5GHz frequency (2.4-2.5) 2.22m/s speed 802.11g: 1. 2.5GHz Frequency(2.4-2.5) 2. 52m/s speed(Security WEP) 802.11i: 1. 2.5GHz Frequency (2.4-2.5) 2. 52m/s Security AES (Advance encryption standard) Mostly interested in a, b, g Wireless Layers Wireless Application Protocol (WAP) Top Level Wireless Session Protocol (WSP) Wireless Transport Layer Security (WTLS) Wireless Access Point (WAP) 802.11 a, b, g Physical WTLS: The following security setting is provided by WTLS: a. Wireless Secure Socket Layer (IP + Port = Socket SSL) b. Wireless Equivalent Privacy (WEP) RC4 Security(Rivest Cipher Algorithm ) *~ Just FYI not on mt or exam. Wireless Mechanism to handle collis
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