Cisco 100-105 Exam

OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Choose Three.)

  • A. Each OSPF area requires a loopback interface to be configured.
  • B. Areas may be assigned any number from 0 to 65535.
  • C. Area 0 is called the backbone area.
  • D. Hierarchical OSPF networks do not require multiple areas.
  • E. Multiple OSPF areas must connect to area 0.
  • F. Single area OSPF networks must be configured in area 1.
Answer: Option B. C. E.
Explanation: 

Definition of OSPF areas: An OSPF network may be structured, or subdivided, into routing areas to simplify administration and optimize traffic and resource utilization. Areas are identified by 32- bit numbers, expressed either simply in decimal, or often in octet-based dot-decimal notation, familiar from IPv4 address notation.
See discussion following Cisco Learning discussion.
https://learningnetwork.cisco.com/message/90832

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