Show Interfaces
In modular router the interfaces are not fixed so that we will be able to installed cards latter on this router. But in case of non modular router the interfaces r fixed, we cannot able to add ports/interfaces latter on. That's all
default
In OSPFv3, the router ID is determined by selecting the highest IP address assigned to an active interface on the router. If no interfaces are available, OSPFv3 will use the highest IPv4 address among the router's loopback interfaces, if configured. If no loopback interfaces are present, and no active IP addresses are available, the router ID remains undefined until one is assigned or the router is restarted. The router ID is essential for uniquely identifying the OSPFv3 router within an OSPF network.
Zero. By default they do not implement any interfaces.
The router ID is used to uniquely identify each router in the OSPF routing domain.If no loopback interfaces are configured, the router chooses the highest active IP address of any of its physical interfaces.
ip default gateway
Configure the router ID on both routers. Configure the R2 router interfaces for area 0. Configure a loopback interface on both routers. Configure the proper subnet masks on the router interfaces.
To determine the number of Fast Ethernet interfaces on a specific router, you would need to refer to the router's technical specifications or product documentation. Fast Ethernet typically refers to interfaces operating at 100 Mbps, and many routers may have multiple Fast Ethernet ports. If you provide the model of the router, I can help you find that information.
172.16.1.1
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the router interface closest to the computer