Spring 2025 Exam

In Linux, the______________ command can be used to create a text file.

touch

In Linux, the command that is used to terminate a process is ______________.

kill

In Python, the ______________ keyword is used to define a short anonymous function.

lambda

UDP and TCP are protocols that operate at the ______________ layer.

transport

The unit of data (or protocol data unit) at the link layer is called a ______________.

frame

______________ is a publish-subscribe protocol, while ______________ is a

client-server protocol.

MQTT, HTTP

A GET request to a REST API server typically gets as part of the HTTP response

content that is in ______________ format.

JSON (key-value)

A UDP socket program on a server must bind to a specific ______________ in order to

receive messages over the network from a client program.

port

If the data rate of a radio is increased, its receiver sensitivity threshold (RST) will

______________ (increase/decrease) and the corresponding communication range will

______________ (increase/decrease).

increase, decrease

A modulation scheme that encodes 8 symbols in the phase of the sinusoidal

electromagnetic (radio) wave is called ______________ .

8-PSK

Each symbol in the 64-QAM modulation scheme encodes ______________ bits.

6

The frequency associated with a 0.01m wavelength radio wave is ______________ .

(Assume the speed of light is 3 x 10

8 m/s).

3 × 10^10 Hz

A received radio power value of -30 dBm is equivalent to ______________ Watts.

10^(-6)

______________ is the term used to refer to the concept of the addition/removal of a

header containing relevant protocol-specific control information at each layer of the

network stack.

encapsulation

Paired Bluetooth devices must share the same ____________________________

sequence.

link key

Recall that the simple path loss equation is PrdBm (d) = PtdBm + KdB - η*10 log10

(d/d0). For a given wireless radio link, the transmit power is 0 dBm, KdB = -50 dB, η = 2, d0 = 1m,

and the receiver sensitivity threshold (RST) is -90 dBm; the corresponding

communication range will be ______________ .

100 m

Consider slotted Aloha with two users on a medium with a maximum single-user rate of

10 Mbps. If both users use the same probability of transmission, the highest total rate

achievable is ______________ .

5 Mbps

On a link with a data rate of 160 bits per second, it is desired to have a maximum

transmission delay (i.e. the time taken to transmit one frame) of 2 seconds. The

maximum frame size is ______________ bytes.

40 bytes