Compare and contrast unicast, broadcast, and multicast communications at the MAC sublayer
What will be an ideal response?
Unicast, broadcast, and multicast are all 48-bit MAC address types. All of them can be desti
nation MAC addresses. Only unicast can be a source address. A unicast address is a unique
address used when a frame is sent from a single transmitting device to a single destination
device. In the case of a broadcast, the frame is destined for all devices in the broadcast
domain and is addressed to a MAC broadcast address of 48 1s (or FF-FF-FF-FF-FF-FF in
hexadecimal). With multicast, a source can send to a group of devices. The low-order bit of
the first byte must be a 1 for the address to be a multicast. If the multicast is also an IP multi
cast, the first 24 bits of the MAC address are 01-00-5E in hexadecimal.
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Charlie likes Alice's picture-password system of the previous exercise, but he has changed the login so that it just shows the user 40 different pictures in random order and they have to indicate which 20 of these are from their set of favorites. Is this an improvement over Alice's system? Why or why not?
What will be an ideal response?
How can a derived class call a base class constructor?
a) implicitly b) explicitly c) a and b d) the derived class cannot call the base class constructor