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LS ACK packet errors:

0 : Neighbor state low 0 : Bad ack

0 : Duplicate ack 0 : Unknown LSA type LS REQ packet errors:

0 : Neighbor state low 0 : Empty request 0 : Bad request

LS UPD packet errors:

0 : Neighbor state low 0 : Newer self-generate LSA 0 : LSA checksum bad 0 : Received less recent LSA 0 : Unknown LSA type Opaque errors:

0 : 9-out of flooding scope 0 : 10-out of flooding scope 0 : 11-out of flooding scope

Retransmission for packet over Limitation errors:

0 : Number for DD Packet 0 : Number for Update Packet 0 : Number for Request Packet Receive Grace LSA errors:

0 : Number of invalid LSAs 0 : Number of policy failed LSAs 0 : Number of wrong period LSAs Configuration errors: 0 : Tunnel cost mistake

0 : The network type of the neighboring interface is not consistent. A.Router ID 冲突

B.Hello 时间间隔和Dead 时间间隔不一致 C.验证类型不一致 D.网络掩码不一致

116.OSPF 邻居无法建立,display ospf error 给出如下信息,有可能的原因是 [RTB]display ospf error

OSPF Process 1 with Router ID 2.2.2.2 OSPF error statistics: General packet errors:

0 : IP: received my own packet 0 : Bad packet 0 : Bad version 0 : Bad checksum

0 : Bad area id 0 : Drop on unnumbered interface 0 : Bad virtual link 0 : Bad authentication type 3 : Bad authentication key 0 : Packet too small 0 : Packet size > ip length 0 : Transmit error 0 : Interface down 0 : Unknown neighbor HELLO packet errors:

0 : Netmask mismatch 0 : Hello timer mismatch

0 : Dead timer mismatch 0 : Extern option mismatch 0 : Router id confusion 0 : Virtual neighbor unknown 0 : NBMA neighbor unknown DD packet errors:

0 : Neighbor state low 0 : Router id confusion

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0 : Extern option mismatch 0 : Unknown LSA type 0 : MTU option mismatch LS ACK packet errors:

0 : Neighbor state low 0 : Bad ack

0 : Duplicate ack 0 : Unknown LSA type LS REQ packet errors:

0 : Neighbor state low 0 : Empty request 0 : Bad request

LS UPD packet errors:

0 : Neighbor state low 0 : Newer self-generate LSA 0 : LSA checksum bad 0 : Received less recent LSA 0 : Unknown LSA type Opaque errors:

0 : 9-out of flooding scope 0 : 10-out of flooding scope 0 : 11-out of flooding scope

Retransmission for packet over Limitation errors:

0 : Number for DD Packet 0 : Number for Update Packet 0 : Number for Request Packet Receive Grace LSA errors:

0 : Number of invalid LSAs 0 : Number of policy failed LSAs 0 : Number of wrong period LSAs Configuration errors: 0 : Tunnel cost mistake

0 : The network type of the neighboring interface is not consistent. A.Router ID 冲突 B.区域ID 不匹配 C.验证密码不一致 D.验证类型不一致

117.OSPF 邻居无法建立,display ospf error 给出如下信息,有可能的原因是 [RTB]display ospf error

OSPF Process 1 with Router ID 2.2.2.2 OSPF error statistics: General packet errors:

0 : IP: received my own packet 0 : Bad packet 0 : Bad version 0 : Bad checksum

7 : Bad area id 0 : Drop on unnumbered interface 0 : Bad virtual link 0 : Bad authentication type 0 : Bad authentication key 0 : Packet too small 0 : Packet size > ip length 0 : Transmit error 0 : Interface down 0 : Unknown neighbor HELLO packet errors:

0 : Netmask mismatch 0 : Hello timer mismatch

0 : Dead timer mismatch 0 : Extern option mismatch 9 : Router id confusion 0 : Virtual neighbor unknown 0 : NBMA neighbor unknown

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DD packet errors:

0 : Neighbor state low 0 : Router id confusion

0 : Extern option mismatch 0 : Unknown LSA type 0 : MTU option mismatch LS ACK packet errors:

0 : Neighbor state low 0 : Bad ack

0 : Duplicate ack 0 : Unknown LSA type LS REQ packet errors:

0 : Neighbor state low 0 : Empty request 0 : Bad request

LS UPD packet errors:

0 : Neighbor state low 0 : Newer self-generate LSA 0 : LSA checksum bad 0 : Received less recent LSA 0 : Unknown LSA type Opaque errors:

0 : 9-out of flooding scope 0 : 10-out of flooding scope 0 : 11-out of flooding scope

Retransmission for packet over Limitation errors:

0 : Number for DD Packet 0 : Number for Update Packet 0 : Number for Request Packet Receive Grace LSA errors:

0 : Number of invalid LSAs 0 : Number of policy failed LSAs 0 : Number of wrong period LSAs Configuration errors: 0 : Tunnel cost mistake

0 : The network type of the neighboring interface is not consistent. A.Hello 时间间隔和Dead 时间间隔不一致 B.区域ID 不匹配 C.网络掩码不一致 D.验证类型不一致

118.OSPF 邻居无法建立,display ospf error 给出如下信息,有可能的原因是 [RTB]display ospf error

OSPF Process 1 with Router ID 2.2.2.2 OSPF error statistics: General packet errors:

0 : IP: received my own packet 0 : Bad packet 0 : Bad version 0 : Bad checksum

0 : Bad area id 0 : Drop on unnumbered interface 0 : Bad virtual link 0 : Bad authentication type 0 : Bad authentication key 0 : Packet too small 0 : Packet size > ip length 0 : Transmit error 0 : Interface down 0 : Unknown neighbor HELLO packet errors:

9 : Netmask mismatch 0 : Hello timer mismatch

0 : Dead timer mismatch 0 : Extern option mismatch

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0 : Router id confusion 0 : Virtual neighbor unknown 0 : NBMA neighbor unknown DD packet errors:

0 : Neighbor state low 0 : Router id confusion

0 : Extern option mismatch 0 : Unknown LSA type 0 : MTU option mismatch LS ACK packet errors:

0 : Neighbor state low 0 : Bad ack

0 : Duplicate ack 0 : Unknown LSA type LS REQ packet errors:

0 : Neighbor state low 0 : Empty request 0 : Bad request

LS UPD packet errors:

0 : Neighbor state low 0 : Newer self-generate LSA 0 : LSA checksum bad 0 : Received less recent LSA 0 : Unknown LSA type Opaque errors:

0 : 9-out of flooding scope 0 : 10-out of flooding scope 0 : 11-out of flooding scope

Retransmission for packet over Limitation errors:

0 : Number for DD Packet 0 : Number for Update Packet 0 : Number for Request Packet Receive Grace LSA errors:

0 : Number of invalid LSAs 0 : Number of policy failed LSAs 0 : Number of wrong period LSAs Configuration errors: 0 : Tunnel cost mistake

0 : The network type of the neighboring interface is not consistent. A.Router ID 冲突 B.网络掩码不一致 C.验证密码不一致 D.验证类型不一致

119.下面关于运行在按需链路上的OSPF 描述错误的是: A.在按需链路上发送HELLO 时,要设置DC 位

B.在建立邻接关系之前,每隔120s 间隔发送一次HELLO 报文,用于检测邻居

C.在建立邻接关系之后,不再发送HELLO 报文,即始终认为对端邻居处于活动状态 D.在建立邻接关系之后,LSA 每隔30min 需要进行一次刷新

120.下面关于LSA age 字段描述正确的是:(请选择2 个答案)

A.LSA age 的单位为秒,在LSDB 中的LSA 的LS age 随时间增长而减少 B.LSA age 的单位为秒,在LSDB 中的LSA 的LS age 随时间增长而增长

C.如果一条LSA 的LS age 达到了LSRefreshTime(30min),这条LSA 的生产者需要重新生成一个该LSA的实例

D.如果一条LSA 的LS age 达到了LSRefreshTime(30min),任意一台路由器都可以对这条LSA 重新生成一个该LSA 的实例

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