200-301: Cisco Certified Network AssociateDemo

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QuestionQ483

IP Connectivity

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Refer to the exhibit. A network engineer must configure the link with these requirements:

  • Consume as few IP addresses as possible.
  • Leave at least two additional useable IP addresses for future growth.

Which set of configurations must be applied?

  • A R1(config-if)#ip address 10.10.10.1 255.255.255.252R2(config-if)#ip address 10.10.10.2 255.255.255.252
  • B R1(config-if)#ip address 10.10.10.1 255.255.255.240R2(config-if)#ip address 10.10.10.12 255.255.255.240
  • C R1(config-if)#ip address 10.10.10.1 255.255.255.248R2(config-if)#ip address 10.10.10.4 255.255.255.248
  • D R1(config-if)#ip address 10.10.10.1 255.255.255.0R2(config-if)#ip address 10.10.10.5 255.255.255.0
Explanation

A /29 subnet is the smallest mask that satisfies both requirements. It provides 6 usable host addresses, which allows 2 addresses for the current router-to-router link and at least 2 more usable addresses for future expansion. A /30 provides only 2 usable addresses and does not leave room for growth, while /28 and /24 waste more addresses than necessary. With 255.255.255.248, the addresses 10.10.10.1 and 10.10.10.4 are valid hosts in the same subnet.

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