3 In Token Ring network any station must detect collisions a (2 points) TRUE FALSE Greater transmission range can be obtained by using optical fiber: (1 Point) single mode O multimode 5 Spanning Tree Protocol creates (2 points) single path between networks multiple paths between networks virtual link between networks Which sentence is true? (2 Points) WiFi networks must detect collisions WiFi frames have four physical addresses In WiFi networks all stations must always see each other O in WiFi networks the the Access Point is mandatory Fresnel zones are shaped like (2 Points) cones O rollers ellipsoids O cuboids none of the above An attenuation of 3 dB means that the signal strength has dropped (2 points) 20 times O 10 times O4 times O 2 times O none of the above 9 Point the correct answers. The length of the MAC Ethernet address is: (2 Points O 64 bits O 32 bits 48 bits O none of the above 10 In optical fiber light beam must obey the (3 Points) Kirchhoff law, O Newton's law Snell's law, Coulomb law O none of the above 11 Hexadecimal presentation of binary number 111001 is: (2 points) Ox41 Ox93 Ox91 Ox39 Ox11 0x77 O none of the above 12 You know that the youngest bit of the MSB of the destination address in the ethernet frame is set to O. It may be an address type (2 points) O unicast multicast O broadcast O anycast