Both host IP router 4 host 192.168.1.? Subnet 255.255.255.?
O:
Host A gateway IP subnet
Host B IP subnet gateway
IP subnet gateway host C
IP subnet gateway host D
The S1 interface of the router A IP subnet, IP subnet of E0, E1 IP subnet
The S1 interface of the router B IP subnet, IP subnet of E0, E1 IP subnet

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This is examination questions,

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Host A IP 192.168.1.0/26 192.168.1.1-62
Host B/IP 192.168.1.64 192.168.1.65 26-126
The host IP 192.168.1.128/C 192.168.1.129 26-190
Host D IP 192.168.1.192/26 192.168.1.193-254
The S1 interface of the router A IP subnet 192.168.1.0/25, E0 IP subnet 192.168.1.0/26, E1/IP subnet 192.168.1.64 26
The S1 interface of the router B IP subnet 192.168.1.128/25, E0 IP subnet 192.168.1.128/26, E1 192.168.1.192 IP subnet/26