An OSPF router has three directly connected networks; 10.0.0.0/16, 10.1.0.0/16, and 10.2.0.0/16. Which OSPF network command would advertise only the 10.1.0.0 network to neighbors?

IT Questions Bank › Category: CCNA › An OSPF router has three directly connected networks; 10.0.0.0/16, 10.1.0.0/16, and 10.2.0.0/16. Which OSPF network command would advertise only the 10.1.0.0 network to neighbors?

Question:
An OSPF router has three directly connected networks; 10.0.0.0/16, 10.1.0.0/16, and 10.2.0.0/16. Which OSPF network command would advertise only the 10.1.0.0 network to neighbors?

router(config-router)# network 10.1.0.0 0.0.255.255 area 0
router(config-router)# network 10.1.0.0 0.0.15.255 area 0
router(config-router)# network 10.1.0.0 255.255.255.0 area 0
router(config-router)# network 10.1.0.0 0.0.0.0 area 0

Explanation: To advertise only the 10.1.0.0/16 network the wildcard mask used in the network command must match the first 16-bits exactly. To match bits exactly, a wildcard mask uses a binary zero. This means that the first 16-bits of the wildcard mask must be zero. The low order 16-bits can all be set to 1.

Exam with this question: Enterprise Networking, Security, and Automation ( Version 7.00) - ENSA Final Exam