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ITM 301 - Notes (Lesson 7)

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Information Technology Management
ITM 301
Farid Shirazi

Network Hardware (Switches & Routers) OSI & Hardware 7 Application }Router, Gateway }(Email Gateway) 6 Presentation }Router, Gateway }(Email Gateway) 5 Session }Router, Gateway }(Email Gateway) 4 Transport }Router, Gateway }(Email Gateway) 3 Network }Router, Gateway }(Email Gateway) 2 Data Link(Logical Link Control, Mac) }Network Interface Card - Switch & Bridge 1 Physical }Network Interface Card -Repeater & Hub 1) Repeater & Hub a. A Repeater is used to extend cable b. A Hub has the same function as a repeater, but is used with star topology ( Cat 5) i. *Note~ We have 2 types of repeaters 1. Passive repeater ( Requires no power source) 2. Active repeater, amplifying repeater ( Needs Power Source) ii. Active Repeaters not only extend cable but also amplify the signal. 2) Bridge a. A bridge layer is a layer 2 device used for connecting two different Net topologies. i. E.g Laptop >>> Access point – Wireless access point (wireless topology)(>> = signal) & a star topology on the right side. A bridge is needed in the middle to connect the two topologies. ii. A bridge contains a “Database” of all MAC Addresses detected. iii. A Bridge operates based on an algorithm called “Spanning Tree Protocol” iv. STP is used to arrange multiple bridges in a parent/child relationship format (Master/slave) v. *~Bridge(root bridge) Bridge(child 1,2,etc) vi. *~ Note is Root bridge is down, one of the child bridges can claim the role of the Root. 3) Switch a. A switch has the functionality of a bridge & a hub b. In contrast to hubs, switches allocate network bandwidth dynamically. c. In addition to bridging function, a switch can be used to implement virtual Lan d. A Virtual Lan defines broadcast domain e. A broadcast domain allows multiple nodes to communicate securely. VLAN Root Switch (Stp) >> Switch (1,2, child switches) (Each switch can represent a division in a company e.g HR and Sales, also branching out from each of these divisions would contain workstations) a. *~ Note Only registered members of a Virtual Lan can participate in a two way communication b.  Non-members cannot access Virtual Lan data communication. 4) Network Interface Card: A NIC contains two types of hardware components: a. Media Access Control b. Physical Interfa
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