A.網(wǎng)絡(luò)層 B.傳輸層 C.會(huì)話層 D.表示層 E.應(yīng)用層
A.224.0.0.1 B.224.0.0.5 C.224.0.0.6 D.224.0.0.9
A.backup 30 60 B.backup delay 30 60 C.backup delay 60 30 D.backup delay enable-delay 30 disable-delay 60