1. Answer C is correct. Bridges are data link layer devices that are software based where as the Switches use the ASIC switching hardware to achieve the same results of bridges but with more speed and reliability.

2. Answer D is correct. Carrier Sense Multiple Access collision avoidance is the media access scheme used by wireless networks to overcome collision.

3. Answer A is correct. Source quench is an ICMP request generated by the receiving end on buffer overflow to alert the sending end and slow down the sending rate.

4. Answer B is correct. The only layer of the OSI that can data is the Presentation layer.

5. Answer B is correct. All devices having Ethernet interface, including a router, will have a MAC address assigned to them.

6. Answer A is correct. OSPF sends individual routing entries that have changed in the form of link packets to all the designated routers.

7. Answer D is correct. A hardware address is 48 bits long (6 bytes).

8. Answer A is correct. Designated routers are so called because they are designated to receive routing updates for a particular area on an OSPF network.

9. Answer A is correct. 100 denotes the bandwidth, Base denotes the base band media type and Fx denotes the Fiber optic media.

10. Answer B is correct. Wireless network use broadband media.

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