What is the vulnerable period of Pure ALOHA for a frame transmission time T?
A frame can collide with another transmission that starts within one frame time before or after it, giving a vulnerable period of 2T.
What is the vulnerable period of Slotted ALOHA for a frame transmission time T?
Because transmissions start only at slot boundaries, the vulnerable period is one frame time.
Which problem is specifically associated with wireless stations that cannot hear one another but can both reach the same receiver?
Hidden terminals can transmit simultaneously because they cannot sense each other, causing a collision at the receiver.
What is the role of the Network Allocation Vector (NAV) in IEEE 802.11?
NAV is a timer used for virtual carrier sensing.
Which 802.11 interframe space has the shortest duration and therefore the highest priority?
SIFS is shorter than PIFS and DIFS and is used for immediate responses such as ACK and CTS.