1 point Which sentence is correct for hubs and switches? A switch operates at OSI Layer-2, whereas a hub operates at OSI Layer-1 When you increase the number of computers connected to a switch, the performance degrades considerably because of more processing within the switch When you increase the number of computers connected to a hub, the performance is not affected because hubs simply repeat the signals without processing CSMA/CD is implemented in switches but is not implemented in hubs Item at position 2 2 1 point Which sentence is incorrect for MAC and IP addresses? A MAC address is represented by 48 bits; an IP address is represented by 32 bits A MAC address is also called physical address; an IP address is also called logical address A MAC address is processed by Hubs; an IP address is processed by switches A MAC address is burned into the chips of NIC; an IP address is stored in the software Item at position 3 3 1 point Which one is used to give a receiving NIC time to realize a frame is coming and exactly where the frame start? Destination MAC address Frame Check Sequence

(FCS) Preamble Type field Item at position 4 4 1 point Which sentence is correct for two computers in the same network? They should have unique IP addresses to communicate They can communicate over MAC addresses even if they do not have IP addresses They can use the same IP addresses if they are using a switch instead of a hub They can always use the same IP address because they have different MAC addresses Item at position 5 5 1 point Think about a switched network of three computers The communication between any two of the computers can be seen by the third computer If every computer is talking with each other (meaning that there are three one-to-one connections), every connection runs at the full network speed Every port on this switch is on its own collision domain Switch stores MAC addresses of these computers