200-301: Cisco Certified Network AssociateDemo

By Cisco · Question Mode

QuestionQ532

IP Connectivity

An office building has 8 floors, with roughly 30–40 users on each floor. Only one subnet can be used. Which command should be configured on the router Switched Virtual Interface to use the address space efficiently?

  • A ip address 192.168.0.0 255.255.0.0
  • B ip address 192.168.0.0 255.255.254.0
  • C ip address 192.168.0.0 255.255.255.128
  • D ip address 192.168.0.0 255.255.255.224
Explanation

A single subnet for 8 floors with approximately 30–40 users per floor must support as many as 320 hosts. The smallest option that provides at least that many usable IPv4 addresses is a /23 mask (255.255.254.0), which supports 510 usable host addresses. A /25 supports only 126 hosts, and a /27 supports only 30 hosts, so both are too small. A /16 would work but wastes far more address space than necessary. Therefore the correct command is the one using 255.255.254.0.

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