Multiple choice

Refer to the exhibit. The corporate network that is shown has been assigned network 172.16.128.0/19 for use at branch office LANs. If VLSM is used, what mask should be used for addressing hosts at Branch4 with minimal waste from unused addresses?

  1. /19

  2. /20

  3. /21

  4. /22

  5. /23
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For a /19 network (172.16.128.0 to 172.16.159.255), we need to address 500+ hosts efficiently. A /22 provides 1022 usable addresses (2^10-2), which is sufficient with minimal waste. Smaller masks (/19-/21) waste addresses; /23 only gives 510 hosts, which is insufficient. Branch4 likely needs 500-1000 hosts.

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