成长值: 31720
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虽然失败,还是要分享下经验,再接再厉
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1、有一道选择题题库未见,题记不清了,是关于CEF(Cisco Express Forwarding)、FIB、 adjacency table 的,和答案选项包括8 Z, a9 ~! `7 I; I/ u# D7 N+ d
A.discard; a9 E" F' |" X0 N
B.punt
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1 x1 z# D9 b3 z: i5 |8 z4 o9 `) j D.glean
7 g& o! h/ e3 _$ Q( v/ W; f 现在我把收集到的选项的解释贴出来,供考试时遇到可以对照选答案(我选的null,应该错了,就是记不到题了,没猜错应该选glean)
( D: j: s$ r5 V3 ? ?, E$ EGlean: This is when the router doesn’t yet know the host MAC address in the adjacency table and therefor has to ARP. The CPU is responsible for ARPing, then the router will wait for an ARP reply. While waiting for the reply the Adjacency Table will store the host address without the MAC address. This will be the glean state.
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Punt: Directed at the CPU, for example if you’re running EIGRP you’ll get punt adjacency to 224.0.0.10 (the EIGRP multicast).- Q- @+ D9 j n6 X! Z4 O
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Null: This is a valid packet but needs to be dropped. You can point a Static Route to null0 to drop packets here.
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8 d4 I/ c3 o% R+ ZDiscard: A Security Policy blocks and drops the packet.: s1 w3 g2 a) O7 _- b" e
* A0 q" Z5 v" n w2、实验题 EIGRP OSPF Redistribution,在R2上输入distance eigrp 90 105 要全部输入,按补全建不会补全。因为补全建没有补全我就没有输入导致少得分。9 @/ h0 u, O0 `0 T: G) n8 M
R2还是R3的 interface 接口的数值和题库数值不一样(Bandwidth,Delay两项),大家要用show interface s0/0/0或f0/0获取实际的值作答。
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. \3 h0 S( @- A/ e9 o. X8 O/ I3、托图题和实验题都如最近战报分析的那几道。本次失利在选择题,好多双选都没选对。希望大家多做题,理解题干和答案。准确作答。, e+ k p: _( A1 @
祝各位考试顺利。 |
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