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恐怖512

2008-05-19 17:09:27

       上周一，512汶川大地震强烈地撼动了我们的安宁生活。长这么大，第一次遭遇地震。一周以来，强烈余震时有来袭，弄得人心惶惶的。

    2:28分，同学们在学校的明德广场上为512汶川大地震的死难者默哀3分钟。是时，国旗降半旗、汽车鸣笛、防空警报响起，现场的气氛十分凝重！在那一刻，大家都屏住了呼吸，安静地为汶川大地震的死难者默哀。

    一想起上周一那场恐怖的大地震，心里就感到恐惧。地震发生时，我正坐在学校寝室里的电脑前，戴着耳塞�..

类别：生活杂侃 | 阅读全文(26) | 回复(0)

OSPF虚链路配置：中转区域

2008-05-10 11:26:08

OSPF采用由两层组成的分层结构，这要求所有的区域都与主干区域（区域0）直接相连。但是，当某个OSPF区域与OSPF主干区域（区域0）之间没有直接连接时，便会导致LSDB不一致以及该区域中的网络无法到达区域0。采用虚链路在该区域与主干区域之间建立起逻辑的连接，便可解决LSDB不一致以及该区域中的网络无法到达区域0的问题。

一、网络拓扑

二、具体配置

1、基本配置：

RA：
Router(config)#hostname RA
RA(config)#interface Loopback0
RA(config-if)#ip ..

类别：路由交换 | 阅读全文(133) | 回复(1)

CCNA2 - Module 11 Exam Answers （05/09/2008 14:30）

2008-05-09 19:52:16

1、Which statements are true regarding the significance of the access control list wildcard mask 0.0.0.7? (Choose two.)

• The first 29 bits of a given IP address will be ignored.
• The last 3 bits of a given IP address will be ignored.
• The first 32 bits of a given IP address will be checked.
• The first 29 bits of a given IP address will be checked.
• The last 3 bits of a given IP address will be checked.

2、Which of the following parameters can ACLs use to..

类别：CCNA练习题 | 阅读全文(198) | 回复(0)

CCNA2 - Module 10 Exam Answers （05/09/2008 14:30）

2008-05-09 19:43:18

1、Which of the following describe how TCP adds reliability to communication? (Choose three.)

• Hosts using TCP set up virtual circuits at the beginning of the transmission using the three-way handshake.
• Hosts using TCP set the error-checking frequency at the beginning of the transmission and maintain this frequency for the duration of the data transfer.
• When a sending host does not receive an acknowledgment within a timed interval it retransmits data.
• The rec..

类别：CCNA练习题 | 阅读全文(74) | 回复(0)

CCNA2 - Module 9 Exam Answers （05/09/2008 14:30）

2008-05-09 19:32:18

1、

After issuing the command traceroute 192.168.4.2 from Router A, the following information is returned
Tracing the route to Router_D (192.168.4.2)

1 Router_B (192.168.2.2) 16 msec 16 msec 16 msec
2 * * *
3 * * *

What can be concluded about the network shown in the graphic based on the output given?

• Network 192.168.5.0 is missing from the routing table on Router
• There is a problem with the connection between Router B and Router C.
• Router C is not ru..

类别：CCNA练习题 | 阅读全文(118) | 回复(0)

CCNA2 - Module 8 Exam Answers （05/09/2008 14:30）

2008-05-09 19:18:16

1、How does a source host use ICMP to confirm that a destination host is reachable?

• The source host sends an ICMP echo request to the destination router which responds with an ICMP echo reply confirming the reachability of the destination host.
• The source host sends a data packet and receives an ICMP host unreachable packet from the destination host if the data packet cannot be delivered.
• The source host sends an ICMP packet with a TTL value of 1 and receives an ICM..

类别：CCNA练习题 | 阅读全文(151) | 回复(0)

CCNA2 - Module 7 Exam Answers （05/09/2008 14:30）

2008-05-09 19:09:58

1、Which command or set of commands will stop the RIP routing process?

RouterB(config)# router rip
RouterB(config-router)# shutdown

RouterB(config)# router rip
RouterB(config-router)# network no 192.168.2.0

RouterB(config)# no router rip

RouterB(config)# router no rip

2、When does a distance vector routing protocol set a hold-down timer on a route?

• when the metric value of the route decreases
• when the route is marked as inaccessible
• when the metric valu..

类别：CCNA练习题 | 阅读全文(108) | 回复(0)

Vlan小实验

2008-05-08 14:38:17

一、场景设置

二、具体实现

首先，将所有的PC配置在192.168.10.0/24这个网络，并测试连通性：
PC1----192.168.10.2
PC2----192.168.10.3
PC3----192.168.10.4
PC4----192.168.10.5

PC1àPC2
C:>ping 192.168.10.3
Pinging 192.168.10.3 with 32 bytes of data:

Reply from 192.168.10.3: bytes=32 time=60ms TTL=241
Reply from 192.168.10.3: bytes=32 time=60ms TTL=241
Reply from 192.168.10.3: bytes=32 time=60ms TTL=241
Reply from 192.168.10.3: bytes=32 time=60..

类别：路由交换 | 阅读全文(69) | 回复(1)

CCNA2 - Module 6 Exam Answers （05/08/2008 14:30）

2008-05-08 14:02:53

1、What can be concluded about the routing process on a router if the commands router rip and network 192.5.5.0 have been issued? (Choose three.)

• A distance vector routing protocol was used.
• A link-state routing protocol was used.
• Routing updates will broadcast every 30 seconds.
• Routing updates will broadcast every 90 seconds.
• Hop count is the metric used for route selection.
• Bandwidth, load, delay, and reliability are the metrics used for ro..

类别：CCNA练习题 | 阅读全文(144) | 回复(0)

CCNA2 - Module 5 Exam Answers （05/08/2008 14:30）

2008-05-08 13:55:41

1、Which command will display the source of the system boot image?

• Router# show version
• Router# show config-register
• Router# show start-up config
• Router# show running-config
• Router# show flash

2、Routers have different types of memory. Choose the answer that describes flash memory.

• provides working storage
• stores a fully functional IOS image
• stores the startup configuration file
• initializes the ..

类别：CCNA练习题 | 阅读全文(280) | 回复(0)

CCNA2 - Module 4 Exam Answers （05/08/2008 14:30）

2008-05-08 13:27:13

1、A network administrator was called away from the terminal while using Telnet to monitor a remote router. The Telnet session was left connected. If the default Telnet configuration is used, what will the administrator find upon returning 15 minutes later?

• The Telnet session entered a "sleep" state and will resume when the spacebar is pressed.
• The Telnet session remained connected and is on the same screen it was left on.
• The Telnet session suspended itself and wil..

类别：CCNA练习题 | 阅读全文(208) | 回复(0)

CCNA2 - Module 3 Exam Answers （05/07/2008 14:30）

2008-05-07 12:50:13

1.Why is it important to create standards for network consistency? (Choose three.)

• reduces network complexity
• increases unplanned downtime
• limits unplanned downtime
• increases bandwidth by regulating networking performance
• limits events that may impact network performance

2.Select the recommended locations to save a running-config file. (Choose three.)

• all network hosts
• network server
• floppy disk
• TFTP server..

类别：CCNA练习题 | 阅读全文(184) | 回复(0)

CCNA2 - Module 2 Exam Answers （05/07/2008 14:30）

2008-05-07 12:46:24

1.Cisco IOS software is separated into two levels as a security feature. What are those two levels? (Choose two.)

• global
• privileged
• local
• user
• interface

2.When the router output is being viewed through a terminal program, which statements are true regarding the --More-- prompt at the bottom of the router display? (Choose two.)

• Press the Spacebar to display the next line.
• Press the Spacebar to view the next screen.
• Press th..

类别：CCNA练习题 | 阅读全文(163) | 回复(0)

CCNA2 - Module 1 Exam Answers （05/07/2008 14:30）

2008-05-07 12:42:17

1.Which of the following descriptions are true regarding the management connections on a Cisco router? (Choose three.)

• They are non-network connections.
• They are used to connect the router to the rest of the production network.
• They are synchronous serial ports.
• They are used for initial router configuration.
• They are asynchronous serial ports.
• They are accessed using their assigned IP address.

2.The console port can be used fo..

类别：CCNA练习题 | 阅读全文(235) | 回复(0)

骂死日本狗

2008-05-02 10:58:30

类别：图吧 | 阅读全文(41) | 回复(0)

多区域OSPF的路由重发布

2008-04-30 13:12:02

一、场景设置

说明：R1 Serial1/0 R2 Serial1/1 R3 Serial1/0 R4。需要在RB上配置路由再分配。

二、具体配置

1、RA的配置如下：
Router(config)#hostname RA
RA(config)#interface Loopback0
RA(config-if)#ip address 1.1.1.1 255.255.255.0
RA(config-if)#ip ospf network point-to-point
RA(config-if)#exit
RA(config)#interface Serial1/0
RA(config-if)#ip address 199.99.1.1 255.255.255.0
RA(config-if)#no shutdown
RA(config-if)#exit
RA(config)#route..

类别：路由交换 | 阅读全文(64) | 回复(1)

多区域OSPF的基本配置

2008-04-30 12:15:36

一、场景设置

二、具体配置

1、RA的配置如下：
Router(config)#hostname RA
RA(config)#interface Loopback0
RA(config-if)#ip address 1.1.1.1 255.255.255.0
RA(config-if)#ip ospf network point-to-point
RA(config-if)#exit
RA(config)#interface Serial1/0
RA(config-if)#ip address 200.200.10.1 255.255.255.0
RA(config-if)#no shutdown
RA(config-if)#exit
RA(config)#router ospf 1
RA(config-router)#network 1.1.1.0 0.0.0.255 area 1
RA(config-router)#network 200.200.10.0 0.0.0.255 a..

类别：路由交换 | 阅读全文(65) | 回复(1)

中国空军飞豹A战机多角度细节特写

2008-04-29 12:08:31

类别：图吧 | 阅读全文(36) | 回复(0)

忘记Linux系统root帐号密码的解决方法

2008-04-26 13:56:47

当我们忘记了Linux系统root帐号密码的时候，我们可以进入单用户模式修改root帐号的密码。具体步骤如下：

1、启动Linux系统，进入系统启动提示界面。如下图所示：

2、按“e”进入下一个界面，如下图所示：

3、按向下箭头键将光标移动至第二行，如下图所示：

4、按“e”进入下一个界面编辑选定的项（首先要空一格，再输入single），如下图所示：

类别：操作系统 | 阅读全文(74) | 回复(0)

十二星座精美壁纸

2008-04-25 22:38:53

类别：图吧 | 阅读全文(105) | 回复(0)

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