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初级工程师
  
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题库很好,全部覆盖
. E @! V9 f- F& z, R0 e c$ R选择题还是Q71,多了个新选项,但并不影响结果,还是按题库的选。
2 C7 C1 O8 Z$ u7 V0 V$ a, f拖图考了Q2,Q3,Q4
3 a6 P- ]: v/ h. t, N/ {, {% G实验题还是老四样:eigrp case;ospf case;route-map;EIGRP OSPF Redistribution
- P7 c2 {' }% GOSPF的Q2,考试时候验证了B和C是正好写反的,所以选了A(理由见下= =)。
I3 B% x; ?6 t1 \( ?6 l6 T: I7 A& Q, i1 C& h4 K+ R( h: Y, }: n1 b
There are two things we should notice from the output :
8 W o0 b" v3 R% v! l" u+ The “network type” connection between R2-R3 is “NON_BROADCAST” (usually we have “BROADCAST”). OSPF neighbors are discovered using multicast Hello packets. In non broadcast environment, multicast (and broadcast) messages are not allowed so OSPF neighborship cannot be formed automatically. Therefore we have to establish OSPF neighborship manually by using “neighbor ” command under OSPF process (OSPF will send unicast Hello message to this address). For example on R2 we have to use these commands:
. B: e. E# q" _, Arouter ospf 1
# g, h4 o" a& e1 a2 t9 Zneighbor 192.168.23.3 | And on R3:
7 I+ M0 N% y3 `7 L' _2 y1 i& Q# qrouter ospf 1+ |6 w8 Q+ |" W# ^) S# D
neighbor 192.168.23.2 | + For non broadcast environment the default Hello timer is 30 seconds; Dead timer (time to wait before declaring a neighbor dead) is 120 seconds and Wait timer (causes the interface to exit out of the wait period and select a DR on a broadcast network. This timer is always equal to the dead timer interval) is 120 seconds. In the output we also see the default timers for non broadcast network., W% v- @; s. w9 a5 U% L
# X4 h! a- ?7 |1 d: V, u. h8 r% _ |
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