LAN Switching and Wireless

641. To guarantee correction of up to 5 errors in all cases, the minimum Hamming distance in a block code must be __________.

  1. 5
  2. 6
  3. 11
  4. none of the above

Correct answer: (C)
11

642. To guarantee the detection of up to 5 errors in all cases, the minimum Hamming distance in a block code must be __________.

  1. 5
  2. 6
  3. 11
  4. none of the above

Correct answer: (B)
6

643. To handle frames arriving from other protocols, Frame Relay uses a device called a _________.

  1. VOFR
  2. FRAD
  3. MUX
  4. none of the above

Correct answer: (B)
FRAD

644. To make addresses more readable, IPv6 specifies _________ notation.

  1. dotted decimal
  2. hexadecimal colon
  3. both a and b
  4. none of the above

Correct answer: (B)
hexadecimal colon

645. To make SONET backward-compatible with the current hierarchy, its frame design includes a system of.

  1. OCs
  2. STMs
  3. STSs
  4. VTs

Correct answer: (D)
VTs

646. To use a cable network for data transmission, we need two key devices: a _________ and a _________

  1. CM; CMS
  2. CT; CMTS
  3. CM; CMTS
  4. none of the above

Correct answer: (C)
CM; CMTS

647. Traditionally, _________ methods of switching have been important.

  1. four
  2. three
  3. five
  4. six

Correct answer: (B)
three

648. Transmission media are usually categorized as _________.

  1. fixed or unfixed
  2. guided or unguided
  3. determinate or indeterminate
  4. metallic or nonmetallic

Correct answer: (B)
guided or unguided

649. Transmission media lie below the _________ layer.

  1. physical
  2. network
  3. transport
  4. application

Correct answer: (A)
physical

650. Two common scrambling techniques are _________.

  1. NRZ and RZ
  2. AMI and NRZ
  3. B8ZS and HDB3
  4. Manchester and differential Manchester

Correct answer: (C)
B8ZS and HDB3

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