What is the minimum Hamming distance required between valid codewords to detect up to 3 bit errors?
To detect d single-bit errors, the minimum Hamming distance $d_{min}$ must satisfy: $d_{min}$ >= d + 1. For d = 3 errors, $d_{min}$ >= 3 + 1 = 4.
In wireless LANs (IEEE 802.11), what is the function of the Network Allocation Vector (NAV)?
The Network Allocation Vector (NAV) is a virtual carrier-sensing timer. Stations use the Duration information in frames such as RTS/CTS to determine how long they should defer access to the medium. Thus A and B are correct.
In a 10 Mbps Ethernet using CSMA/CD, what is the maximum backoff delay in slot times after the 3rd consecutive collision under Binary Exponential Backoff?
Under exponential backoff, after collision $k = 3$, the random delay r is chosen uniformly from [0, $2^k - 1$] = [0, $2^3 - 1$] = [0, 7]. The maximum delay is 7 slot times.
Which field in the standard IEEE 802.3 Ethernet frame specifies the length of the data payload or the higher-layer protocol type?
Values <= 1500 designate the payload length in bytes (802.3 raw), while values >= 1536 (0x0600) designate EtherType (e.g., 0x0800 for IPv4).
What is the maximum data rate of a classic Bluetooth 1.2 Basic Rate connection?
Classic Bluetooth (Basic Rate IEEE 802.15.1) operates in the 2.4 GHz ISM band with a nominal raw bit rate of 1 Mbps using GFSK modulation.