![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
POS(Packet Over SONET/SDH,SONET/SDH上的分组)将长度固定的数据包直接映射进SONET同步载荷中,
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
OSPF选举DR、BDR时会使用如下的那些报文? 。()
A.HELLO报文(Hello Packet);
B.DD报文(Database Description Packet);
C.LSR报文(Link State Request Packet);
D.LSU报文(Link State Update Packet);
E.LSAck报文(Link State Acknowledgmen Packet);
LSAck报文是对下列那些OSPF报文的确认? 。()
A.HELLO报文(Hello Packet);
B.DD报文(Database Description Packet);
C.LSR报文(Link State Request Packet);
D.LSU报文(Link State Update Packet);
E.LSAck报文(Link State Acknowledgmen Packet);
下列那些OSPF报文中会出现完整的LSA信息? 。()
A.HELLO报文(Hello Packet);
B.DD报文(Database Description Packet);
C.LSR报文(Link State Request Packet);
D.LSU报文(Link State Update Packet);
E.LSAck报文(Link State Acknowledgmen Packet);
A.can be
B.will be
C.shall be
D.should be
A.bit—frame----packet—data—segment
B.bit—packet—frame—data—segment
C.bit—frame—packet—segment—data
D.bit—packet—frame—segment—data
A.Switch(config-if)#
B.Switch#
C.Switch>
D.Switch(config)#