[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fZwV8pHpX4QhzinhCmcl2Qhiku9yYcX0pV9zwJPK0JJE":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-06-15 13:19:25",151706813,[8,9,10,11],"IPv4头校验和字段长度为8位","校验和对IP分组头与分组数据进行的计算","IP分组头的头校验和是为了保证分组头传输安全性","IP分组头中只有TTL值每经过一个路由器都一定会变化",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},42,"c81896f4c4ad99fc6f2d89361eb5fc05","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa846b7a6fb18eaad84b93d27f7791f62.jpg","计算机网络","work_35598435","第四章作业","以下关于IPv4分组校验和的描述中,错误的是",[21,33,43,52,61,64,73,83,93,102],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-06-15 13:19:18",151706802,[26,27,28,29],"网络层要实现路由选择、拥塞控制与网络互联","网络层服务要依赖于通信子网所采用的技术","网络层向传输层端端传输连接提供服务","网络层具有跨局域网、城域网与广域网的互联网络寻址能力","以下关于网络层基本概念的描述中,错误的是","v1",0,{"answer":34,"createTime":35,"id":36,"options":37,"question":42,"source":31,"type":32},[],"2024-06-15 13:19:23",151706805,[38,39,40,41],"异构性是指网络和通信协议、计算机硬件或操作系统上","网络互联异构性主要表现之一是广域网、城域网、局域网的互联","利用路由器将两个或两个以,上网络互连起来构成的系统叫作互联网络","利用集线器实现多层级联方法组建的大型局域网系统也是一种互联网络","以下关于异构网络互联的描述中,错误的是",{"answer":44,"createTime":5,"id":45,"options":46,"question":51,"source":31,"type":32},[],151706807,[47,48,49,50],"IP协议是点对点的网络层通信协议","IP协议提供的是--种"尽力而为"的服务","无连接并不意味着IP协议不维护IP分组发送后的状态信息","不可靠意味着IP协议不能保证每个IP分组都能够正确的到达目的节点","以下关于IP协议特点的描述中, 错误的是",{"answer":53,"createTime":5,"id":54,"options":55,"question":60,"source":31,"type":32},[],151706810,[56,57,58,59],"IPv4分组头的长度是可变的","分组头长度最小为20B,最大为60B","协议字段表示IP协议版本号,值为4表示IPv4","生存时间字段表示--个分组一次传输过程中可以经过的最多的跳数","以下关于IP分组结构的描述中,错误的是",{"answer":62,"createTime":5,"id":6,"options":63,"question":19,"source":31,"type":32},[],[8,9,10,11],{"answer":65,"createTime":5,"id":66,"options":67,"question":72,"source":31,"type":32},[],151706815,[68,69,70,71],"片偏移值是以8字节为单位来计数的","IP 分组长度大于MTU时,就对IP分组进行分片","分片MF值为1表示接收的分片不是最后的-一个分片","DF=1,分组的长度又超过MTU,则丢弃该分组,不需要向源主机报告","以下关于IP分组分片基本方法的描述中,错误的是",{"answer":74,"createTime":75,"id":76,"options":77,"question":82,"source":31,"type":32},[],"2024-06-15 13:19:26",151706817,[78,79,80,81],"65535B","536B","1500B","可变","IPv4 分组的最大长度理论上可达到_",{"answer":84,"createTime":85,"id":86,"options":87,"question":92,"source":31,"type":32},[],"2024-06-15 13:19:27",151706818,[88,89,90,91],"源路由是由发送分组的源主机制定的传输路径","源路由主要用于测试某个网络的吞吐量,绕开出错网络","严格源路由规定分组要经过的路径上每个路由器,顺序可以改变","松散源路由规定的不是一条完整的传输路径,中间可以经过其他路由器","以 下关于IP分组头选项特点的描述中,错误的是",{"answer":94,"createTime":85,"id":95,"options":96,"question":101,"source":31,"type":32},[],151706819,[97,98,99,100],"191.1. 76.0","191. 1.76.255","191.1.77.255","191. 1. 79.255","主机的 IP地址为191. 1. 77.55,子网掩码为255. 255. 252. 0,那么它向其所在子网内发送广播分组,使用的目的地址为",{"answer":103,"createTime":85,"id":104,"options":105,"question":110,"source":31,"type":32},[],151706820,[106,107,108,109],"全1","全0","相同","不同","同一子网中两台主机的IP地址与子网掩码"相与"的结果是"]