1. (TCO B) Data link layer protocols perform all of the following functions exce
ID: 3647244 • Letter: 1
Question
1. (TCO B) Data link layer protocols perform all of the following functions except:Identifies the start and end of a message by using a PDU
Detects and corrects transmission errors
Is responsible for packet regeneration
Controls when computers transmit
2. (TCO B) All of the following are ways to prevent errors except?
Moving cables away from power cables
Using unshielded cables
Implement repeaters or amplifiers
Tune transmission equipment
3. (TCO B) Which of the following is true about roll calling polling?
It cannot be modified to increase priority of client or terminals
It does not require a server or host or special device that performs the polling
It is a type of contention approach to media access control
It typically involves some waiting because the front-end processor or server has to wait for a response from the polled client or terminal.
4. (TCO B) With odd parity (assume that the party bit (in bold) has been placed at the end of each of the following) and a 7-bit ASCII code, which of the following is incorrect?
00011011
01101011
11111110
00100101
5. (TCO B) Your new position requires that you maintain a Token Ring network that includes several IBM mainframes. What type of access control would this network most likely use?
Contention based
Mixed Mode
Relative performance based
Controlled based
Explanation / Answer
Identifies the start and end of a message by using a PDU It is a type of contention approach to media access control
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