[ LiB ]Chapter 5 Chapter 7

Chapter 6

1:

Which of the following digital services does ISDN provide?

  1. Voice

  2. Data

  3. Text

  4. Graphics

  5. Music

  6. Video

  7. All of the above

A1:

Answer: G

2:

Which of the following services does an NT2 device perform?

  1. Compression

  2. Switching

  3. Concentrating

  4. Encryption

A2:

Answer: B, C

3:

What type of interface can make up the R reference point?

  1. EIA/TIA 232-C

  2. X.25

  3. c.V.24

  4. V.35

A3:

Answer: A, C, D

4:

What type of standard cable does the BRI U interface use?

  1. Two-wire

  2. Four-wire

  3. Six-wire

  4. BRI-wire

A4:

Answer: A

5:

What happens when no more traffic is transmitted over the ISDN call?

  1. An idle timer starts.

  2. The call disconnects.

  3. The bandwidth deteriorates.

  4. Unidirectional flow changes directions.

A5:

Answer: A

6:

What happens if the isdn switch-type command is used in global mode?

  1. Only one interface accepts that switch type.

  2. All ISDN interfaces assume the same switch type.

  3. A few ISDN interfaces assume the same switch type.

  4. Integrated services are enhanced.

A6:

Answer: B, C

7:

True or false: Static routes are used in stub environments to save costs.

A7:

Answer: False

8:

What type of framing is used for modern T1 PRI configurations?

  1. sf

  2. esf

  3. crc4

  4. no-crc4

A8:

Answer: B

9:

Which linecode type is specified for T1 PRI configuration?

  1. ami

  2. b8zs

  3. hdb3

  4. None of the above

A9:

Answer: B

10:

True or false: Rate adaptation can increase the ISDN channel speed.

A10:

Answer: False

[ LiB ]Chapter 5 Chapter 7