【单选题】当一个IP数据报的TTL(生存周期)值为0时,路由器将产生一个报文,通知源主机该数据报已被抛弃。
【单选题】IP 数据报的“ TTL 生存时间”值为()时数据报文将被丢弃。
【简答题】Susan wanted to be independent of her parents.She tried _________ alone.but she didn’t like it and moved back home. A.living B.to live C.to be living D.having lived
【单选题】“被之僮僮,夙夜在公”中“公”指的是()。
【简答题】Susan wanted to be independent of her parents.She tried _________ alone.but she didn’t like it and moved back home. A.living B.to live C.to be living D.having rived
【判断题】生存周期TTL指的是 IP 数据报在网络中的有效时间。 实际操作中,生存周期被设为一个正整数,每过一个路由器其值减一,生存周期为零的数据报被路由器删除不再转发。
【简答题】Why didn’t the mom see her daughter had become a toddler? (Para. 1) Because she had been so busy trying to ______________ ________ . 2.What did the mom try to protect her daughter from? (Para. 2) She ...
【单选题】为了防止因出现网络路由环路,而导致IP数据报在网络中无休止地转发,IP协议在IP包头设置了表示(1)的TTL位,它是一个计数器,每经过(2),其值加1。空白处(1)应选择()