LAN Switching and Wireless

431. In modulo-11 arithmetic, we use only the integers in the range __________, inclusive.

1. 1 to 10
2. 1 to 11
3. 0 to 10
4. none of the above

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432. In modulo-2 arithmetic, __________ give the same results.

1. addition and multiplication
2. addition and division
3. addition and subtraction
4. none of the above

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433. In modulo-2 arithmetic, we use only __________.

1. 1 and 2
2. 0 and 2
3. 0 and 1
4. none of the above

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434. In modulo-2 arithmetic, we use the __________ operation for both addition and subtraction.

1. XOR
2. OR
3. AND
4. none of the above

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435. In one's complement arithmetic, if positive 7 is 0111, then negative 7 is __________.

1. 1111
2. 1101
3. 1000
4. none of the above

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436. In PPP, _________ is a simple authentication procedure with a two-step process:

1. NCP
2. LCP
3. CHAP
4. PAP

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437. In PPP, _________ is a three-way hand-shaking authentication protocol in which the password is kept secret; it is never sent online.

1. NCP
2. LCP
3. CHAP
4. PAP

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438. In PPP, the _________ is responsible for establishing, maintaining, configuring, and terminating links.

1. NCP
2. LCP
3. CHAP
4. PAP

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439. In pure ALOHA, the vulnerable time is _________ the frame transmission time.

1. the same as
2. two times
3. three times
4. none of the above

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440. In QAM, both _________ of a carrier frequency are varied.

1. frequency and amplitude
2. phase and frequency
3. amplitude and phase
4. none of the above

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