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思科考试全面涨价-24th,June,2008

Jerome — Tue, 24 Jun 2008 07:56:00 GMT

CCNA认证考试费价格翻倍！由125美元调到250美元

CCNP认证考试642-901、642-812、642-825、642-845现在价格每门150美元，在原价125美元的基础涨了20%。
CCNP认证的642-892考试费用现在为300美元，价格在原价187.5美元基础上上调60%。

CCSP认证考试每门考试为150美元，均在原价125美元基础上调20%。

CCIE认证笔试350美元，在原价315美元基础涨了11.11%

Cisco has announced a price increase for its exams effective June 24, 2008.  The following FAQ from Cisco provides
additional information on this increase.
FAQ for Price Adjustment to CCNA Comprehensive, Professional-level Composite and CCIE Exams
June 24, 2008

Q: What exactly is the price adjustment being made at this time?
A:  As of June 24, 2008, the price of the CCNA comprehensive exam #640-802, the single exam option for achieving CCNA
certification, will be $250 USD, the professional-level Composite exam #642-892, will be $300 USD and the CCIE written
exams will be $350 USD or the local currency equivalent in all regions.

Q: Why is the price being adjusted at this time?
A:  Our market analysis indicates the prices of these exams are out of line with the market value they provide and with
other IT certification exams at the Associate, Professional and Expert level.  Cisco Career Certifications is one of the
industry’s most recognizable and highly valued programs for IT professionals.  Achieving a CCNA, Professional or Expert
certification validates knowledge and hands-on skill with the world’s leading networking solutions.

Q: Will the price be adjusted in all worldwide locations?
A:  Yes, the price will be adjusted in all regions.  Cisco Certified Learning Partners in some areas may include the
exam along with a training course for a single price.

Q: Will the price to Networking Academy students also be changed?
A:  Consistent with our past years strategy, Cisco will provide financial assistance to Cisco Networking Academy
students in the form of discounts to offset the cost of key certification exams.

Q:  Will the price increase impact the Cisco CA employee discount?
A:  CA employee voucher program will not change ($50USD)

Jerome 2008-06-24 15:56 发表评论

How to configure a routed port on a Multilayer switch

Jerome — Tue, 17 Jun 2008 01:28:00 GMT

Configuring routed port on a physical port like as following:

Here,give an example of it.
Switch#conf t
switch(config)#ip routing
Switch(config)#int f1/2
Switch(config-if)#no switchport
Switch(config-if)#ip add 10.1.10.1 255.255.255.0
Switch(config-if)#no shut
switch(config)#router rip
switch(config-router)#version 2
switch(config-router)#network 10.1.10.0
switch(config-router)#end
switch#write

Jerome 2008-06-17 09:28 发表评论

Inter-vlan routing on external router

Jerome — Mon, 16 Jun 2008 07:16:00 GMT

在没有三层交换机的情况下，二层交换机的不同vlan可以通过外部路由器进行路由。实现不同vlan间的互访。其实就是在交换机外部加了一个路由模块。对于这种情况有一种叫法---单臂路由。
下面看看在使用ISL trunk的端口上如何实现。入图所示：

在图中，我们划分了两个vlan10，vlan20.假设终端10.10.1.2接在端口f1/2上，10.20.1.2接在端口f1/3。那么在交换机上只需要将端口分配到合适的vlan就可以了。交换机的f1/24端口和路由器相连。采用以下命令即可实现。
switch#vlan database
switch(vlan)#vlan 10
switch(vlan)#vlan 20
switch#conf t
switch(config)#int f1/2
switch(config-if)#switchport mode access
switch(config-if)#swithport access vlan 10
switch(config-if)#exit
switch(config)#int f1/3
switch(config-if)#switchport mode access
switch(config-if)#swithport access vlan 10
switch(config-if)#exit
switch(config)#int f1/24
switch（config-if)#encapsulation ISL
switch(config-if)#switchport mode trunk allowed vlan all
switch(config-if)#no shut
swith#wr
如果要配置管理vlan的话，先给vlan10和vlan20分配一个地址。
switch(config)#int vlan 10
switch(config-vlan)#ip add 10.10.1.100 255.255.255.0
switch(config-vlan)#no shut
switch(config-vlan)#int vlan 20
switch(config-vlan)#ip add 10.20.1.100 255.255.255.0
switch(confgi-vlan#end
要能够路由vlan间的流量，在路由器端需要做的设置。
router#conf t
router(config)#int f0/0
router(config-if)#no ip address
router(config-if)#no shut
router(config)#int f0/0.10
router(config-if)#encapsulation isl 10
router(config-if)#ip address 10.10.1.1 255.255.255.0
router(config-if)#no shut
router(config)#int f0/0.20
router(config-if)#encapsulation isl 20
router(config-if)#ip address 10.20.1.1 255.255.255.0
router(config-if)#no shut
router#wr
配置完成后，可以在router上进行测试。
router#ping 10.10.1.2
或者router#ping 10.20.1.2
也可以在终端上
client#ping 10.10.1.1
client#ping 10.20.1.2
看是否能够通讯。如果可以，则表明vlan间的流量是可以互通的。

Jerome 2008-06-16 15:16 发表评论

Fix up the task RSS FeedS error of Microsoft outlook 2007

Jerome — Tue, 03 Jun 2008 03:06:00 GMT

Have you ever experienced this problem? when you start your outlook 2007 and check whether there are some new emails when you notice that an error reported in the status bar, that is, "Task 'RSS Feeds' reported error (0x8004010F): 'The operation failed. An object cannot be found'",when encountered this problem, i am so puzzled, but try to solve it. Fortunatly, i find the way to cope with it. Because of thie problem, it seems that the mailbox cann't sychronize with the exchange server in time but have a delay. it indeed a serious problem, however, how to overcome it? i'll share the method of mine.
if you use Micorosft Outlook 2007, then you are very familiar with the operation.
Step 1: please click menu File->choose "import and export...",then you will see a screen as following:

choose "export Rss feeds to an OPML", according to tips till finish the operation.
Step 2: Close the outlook and restart the outlook with command of "outlook /cleansharing" in the run window.
Step 3: Enter memu "tool"->"option"->"mail setup"->"email accounts",a window will appear like below:

step 4: Remove the original RSS folders and Feed name, re-create yours. You can by choosing "change folder" to define your favarite RRS. the red pane just a mark which you should pay more attention.
sten 5: After creating new RSS folder and import the file of OPML file you exported before.

Now pls have a try and press the button of "send and receive",to have a look at whether still have the same probem. Here only a way of thinking, Maybe have you any diffenences about this. Finally, i get rid of the problem and have a record of this process.

Jerome 2008-06-03 11:06 发表评论

无法获得路由更新

Jerome — Tue, 27 May 2008 08:49:00 GMT

昨天在做HSRP实验时，遇到了一个很不解的问题。就是用路由器R3的loopback0接口模拟外部网路。R3的s1/0和S1/1接口分别接R1的S1/0和R2的。
S1/0接口。使用拓扑图如下

在配置完成后，在R1和R2上用Show standby查看，发现HSRP已然生效。就打算在PC上进行测试，看当R1和R2接口F0/0的优先级改变时，选择哪条路径。或者当R1或者R2上的S1/0 shutdown的时候，备份路由会起作用，所以在R1,R2,R3上面配置动态路由协议Rip。IP地址的分配如图所示。R1和R2都可以学到R3的路由，但R3怎么也不能学到R1和R2的路由。所以就没法在PC上进行tranceroute了。检查了好久。才发现由于在路由器的IOS中默认启用了ip classless功能，路由因该是按最长匹配的。在R1和R2上宣告路由的时候因该是network 192.168.1.0，而我原来是用network 192.168.0.0。当把路由改过来后，发现一起正常了。在PC上使用traceroute 202.101.8.12，完全可以按照预先设定的情况选择备份路径。

Jerome 2008-05-27 16:49 发表评论

Hp6510b Latitude启动报告SMART属性失败

Jerome — Thu, 08 May 2008 08:59:00 GMT

前天晚上用的都好好的，第二天早晨开机，发现莫名的跳出来一个对话框，说让我按F1忽略，仔细一看，原来是检测到硬盘的SMART属性失败。具体信息如下：
1720-Smart hard drive detects imminent failure（failure attr:184),please backup the content of the hard drive and run HDD selftest in F10 setup.
虽然按F1能够进入系统，但有点担心以后硬盘数据丢失，还是联系惠普维修。明天准备换个硬盘，这样保险一点。

Jerome 2008-05-08 16:59 发表评论

the error information of Cisco router startup

Jerome — Thu, 24 Apr 2008 02:16:00 GMT

I have never encountered this problem ever before,except this morning. I intend to finish a lab, and startup the cisco router when some error information appearing. During bootup of Cisco hardware through Cisco IOS software,error messages similar to these are displayed every time, what's more, it also appeared occasionally when you checked the interfaces' status, once you operate the router with commands, error messages similar to these are displayed:
Occasionally, during bootup of Cisco hardware through Cisco IOS software, error messages similar to these are displayed:

            %Error opening tftp://255.255.255.255/network-confg (Socket error)
            %Error opening tftp://255.255.255.255/cisconet.cfg (Socket error)
            %Error opening tftp://255.255.255.255/3620-confg (Socket error)

These error messages are related to the default service configuration option built into Cisco IOS software, which attempts to access the service configuration files from a network Trivial File Transfer Protocol (TFTP) server.

Solution

To disable this feature, execute the no service config global command.
           Router#config terminal
          Enter configuration commands, one per line.
           Router(config)#no service config
           Router(config)#exit
           Router#copy running-config startup-config
           Router#reload
Hereafter,these error messages no longer appear at the next bootup of the router.

Jerome 2008-04-24 10:16 发表评论

光线布线中计算信号损耗

Jerome — Wed, 23 Apr 2008 05:28:00 GMT

1，一种计算方法是用于确定一段事先存在的光纤中的最大的信号损耗。
2，另一种方法是用于确定在已知预算和损耗变量的情况下最大的光纤距离。
　　第一种方法：损耗=光纤衰减*公里数+接头衰减*接头数量+连接器衰减*连接器的数量+安全富余数
　　第二种方法：功率预算=最小起始功率-接收灵敏度
　　光纤每公里的最大衰减数如下：

　　850波长（625）=3DB/KM
　　1300波长（625）=1DB/KM
　　1300波长（9）=0。3DB/KM
　　1550波长（9）=0。2DB/KM

　　例如，引用下面所用过的数字：

　　功率预算=13DB
　　接头的损耗=-0.1DB
　　连接器的损耗=-1。5DB
　　安全富佘=-3DB
　　净功率预算=8。4DB
　　如果光纤的损耗按规定不得超过0。3DB/KM，则：
　　（8．4DB）/（0。3DB/KM）=28KM

　　现在就可以知道，在接收端信号强度耗光之前可以走线的光纤长度。

　　光纤的长度要取决于距离的计算，或是模态色散，而不管哪一种是最低的。例如，假设正在使用经过850纳米多模光纤的100兆比特/每秒的快速以太网（这种以太网具有125兆比特/每秒的实际比特率）。850纳米多模电缆的模态色散为185兆比特/每秒一公里。使用下面的公式来计算一个125兆比特/每秒信号的最大距离：
　　距离=185兆赫兹-公里/125兆赫兹=1。5公里。
　　同样地，计算一个10兆比特/每秒以太网数据速率的最大距离：
　　距离=185兆赫兹-公里/10兆赫兹=18。5公里。

Jerome 2008-04-23 13:28 发表评论

Windows command prompt中内部命令或外部命令不可用

Jerome — Wed, 16 Apr 2008 02:31:00 GMT

经常出现在命令窗口中不能运行命令的事情。甚是让人头疼。今天又遇到了。在“运行”中输入“cmd”，进入命令窗口，运行“ipconfig”，“ping”，“route print”等，全不能运行。而在窗口中输入“%systemRoot%\system32\ipconfig”，却能正常运行。从而判断应该是系统变量中路径没了。在窗口中使用命令“set path=c:\windows;c:\windows\system32;c:\windows\system32\wbem”。然后在prompt下运行“ipconfig”,一切ok.
重新启动系统，发现故障依旧。进入“我的电脑”- >“属性”->“高级”->“环境变量”，选择系统变量，找到path，进入“编辑”。将其值设为“c:\windows;c:\windows\system32;c:\windows\system32\wbem”。这次彻底解决问题。

Jerome 2008-04-16 10:31 发表评论

ISIS实验中碰到的一个问题

Jerome — Tue, 15 Apr 2008 05:15:00 GMT

在做ISIS实验中，使用的拓扑图如下图所示：

在所有接口上开启ISIS时，忘记将R4的Loopback接口上使用命令ip router isis，而其它所有接口上都应用ip router isis 启用ISIS。则当使用命令trace从R3 trace R4时，发现只能到达边缘路由器R1。相反，从R4 trace R3时，可以正常的经由边缘路由器R2到达R3的loopback。

Jerome 2008-04-15 13:15 发表评论