An OSPF router does not have a router ID configured. In this scenario, which statement is correct about the router ID?

Question

Options

• AThe Junos OS will use the IP address assigned to the interface with the lowest MAC address.
• BA router ID will not be assigned until it is manually configured.
• CThe Junos OS will use the IP address assigned to the loopback interface for the router ID.
• DThe Junos OS will use the IP address assigned to the Interface with the highest priority.

• A
  3% (1)
• B
  6% (2)
• C
  73% (24)
• D
  18% (6)

Explanation

The router identifier is used by BGP and OSPF to identify the routing device from which a packet originated. The router identifier usually is the IP address of the local routing device. If you do not configure a router identifier, the IP address of the first interface to come online is used. This is usually the loopback interface. Otherwise, the first hardware interface with an IP address is used In OSPF, if a router ID is not manually configured, Junos OS will automatically select the router ID based on the highest IP address of any of the router's loopback interfaces. If no loopback interface exists, the highest IP address of any active interface will be used. Therefore, answer C

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