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yes each and every device in a network will have unique mac address.
Modern networks used two devices for the data packets within the network will flow easily. The two devices are the routers and switches.
The physical layer is layer 1. It comprises the hardware (routers, repeaters, hubs, switches, etc.) that are used to form the physical basis of a network. They receive, process, and transmit raw electric (or optical) signals, rather than logical data packets.
Routers support a variety of interface types. Switches typically support Ethernet interfaces.
yes they do.
Routers don't use MAC addresses for routing. They use IP address.
Yes
Yes
A logical topology shows how a network is configured logically rather than physically. The main difference is that you could have 10 routers, 25 switches, and 5,000 computers in a logical topology and it doesn't matter where they are on the screen, it matters how they are connected to one another.
a. Routers are more expensive than bridges. b. Routers operate at the first three-layers; bridges operates at the first two layers. Routers are not designed to provide direct filtering the way the bridges do. A router needs to search a routing table which is normally longer and more time consuming than a filtering table. c. A router needs to decapsulate and encapsulate the frame and change physical addresses in the frame because the physical addresses in the arriving frame define the previous node and the current router; they must be changed to the physical addresses of the current router and the next hop. A bridge does not change the physical addresses. Changing addresses, and other fields, in the frame means much unnecessary overhead.
Bridges, Switches and Routers will all separate collision domains.
Depends on how many switches each router takes. You need a router to connect all the other routers, and then enough switches to make 81. For example, you can use 6 16 port routers to connect the computers and 1 8 port router to connect those routers together