You are deploying two core switches， one in each building， 50 km away from each other. The cross-connection between them will be a Layer 2 2-gigabit EtherChannel with an 802.1Q trunk. You configured it correctly but the link does not come up. The port is in the "admin up" state， and the line protocol is in the "down" state. The fiber link is OK. What would be the most likely reason for the link not to come up？（） ["The switches are not the same model.","You are not using the correct SFP.","You are not using correct optical media converters.","Configuration should be modified， because the distance is longer."]
为什么说班级是学生成长的重要环境。
当许多国人为美丽城市夜景感到骄傲的时候，并没有考虑到：这些所谓的“不夜城”恰恰是中国光污染的重灾区。下列现象中会造成光污染的是（）。 ["汽车车窗玻璃上贴太阳膜","城市建筑大面积安装玻璃幕墙","利用太阳能制氢燃料","用家用汽车代替公交车"]
为防止绞接顶梁梁头扎破金属网，可利用旧木料在（）处垫好。 ["梁头","网头","梁尾","梁窝"]
Refer to the exhibit. How would you get the 1.1.1.1 network into the OSPF database？ （） [" Configure RTA as an ASBR"," Redistribute connected routes on RTA into OSPF"," Set up a virtual link between area 1 and area 0"," Set up a virtual link between area 1 and area 2"," Add a static route into RTB and enter it into OSPF"," Place a network 1.1.1.0 0.0.0.0 command into RTB"," Set up a unique router ID on RTA using an RFC 1918 address"," Change area 0 on RTB to area 1"]
写传道书的总意识什么？
