What field in IP packet is prevent the packet from a route to router forever？
水体的富营养作用
以健身为目的的体育锻炼一般以（）的准备活动为宜。 5~10分钟。 10~15分钟。 15~20分钟。 20~25分钟。
夏目漱石的全集共多少卷：（） 7.0。 17.0。 27.0。 37.0。
Which of the following describe the process identifier that is used to run OSPF on a router?（） It is locally significant.。 It is globally significant.。 It is needed to identify a unique instance of an OSPF database.。 It is an optional parameter required only if multiple OSPF processes are running on the router.。 All routers in the same OSPF area must have the same process ID if they are to exchange routing information.。
汽油机燃烧过程中最主要的阶段是（）
