Ch 4 MIS 4123
In general, controlled approaches do not require a host, server, or active monitor to assign media access control.
False
Media access control is not very important in a multipoint configuration.
False
Media access control is not very important in a point-to-point with a half-duplex configuration.
False
Polling is the process of permitting all clients to transmit or receive at any time.
False
Synchronous transmission uses start bits before each character to be sent.
False
The data link layer is responsible for encoding the bit-stream as a series of electronic voltages.
False
The data link protocol, PPP is a bit-oriented protocol.
False
Using parity, the probability for detecting an error, given that one has occurred, is about 25% for either even or odd parity.
False
Using parity, the probability for detecting an error, given that one has occurred, is about 30% for even parity and 70% for odd parity.
False
With contention, a computer does not have to wait before it can transmit. A computer can transmit at any time.
False
____________ refers to bits that have been changed, in error, from 1 to 0, or vice versa, in a data transmission.
Flipped bits
Cyclical redundancy check is one of the most popular polynomial error-checking schemes.
True
Media access controls refer to the need to control when computers transmit.
True
Which of the following is not a type of synchronous protocol?
VT100
In an odd parity-checking scheme, the parity bit is set to make the total number of ones in the byte (including the parity bit) an even number.
False
__________ is a software-enabled technique that can change the hardcoded MAC address to any MAC address and thus overcome MAC address filtering.
MAC address spoofing
Crosstalk occurs when the signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.
True
Errors on a network can occur:
because of noise on the line.
When a signal is reflected back to the transmitting equipment, it is called a(n) _________.
echo
Cross-talk:
occurs when one circuit picks up signals in another.