Global debugging
When configuring a Cisco router, the boundaries between global and interface commands are obvious. In this case, we use "Global" to identify commands that cannot be used for interface debugging or specific transmission media types and Protocol debugging. For example, in vrouters 2500, you can use Debugging commands to analyze the Cisco Discovery Protocol (CDP ). We remotely log on to the vrotelnet through telnet. By default, the outpu
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mode of data processing commands: immediate number, register, and register shift.
The addressing method of the load/store command of characters and unsigned bytes, miscellaneous, and batch data transmission.
Chapter 3 Introduction to arm Instruction Sets. Some basic arm Instruction Function segments.
Four jump commands B (jump command), BL (jump command with return), blx (jump command with return and status switch), and Bx (jump command with status switch)
Three data processing commands: Data T
) smlal {cond} {s}
Iv. Jump commandsThere are two methods to achieve program jump in arm. One is to use Jump commands to directly jump, and the other is to directly assign values to PC registers to achieve jump.Operator condition Code LocationB label jump command PC terminal Label B {cond}BL label jump command LR ← PC-4 with Link, PC ← label BL {cond}Bx rm jump command PC terminal label with status switch, switch processing status BX {cond}
5. Arm coprocessor commandsArm supports coprocessor ope
Delay secport Vl An port-state cost priority Fast-start Group-method------------------------------------------------------------- 1/1 1 Forwarding Disabled 1 blocking disabled
Although this information indicates that the root bridge bid is 100.00-e0-f9-16-28-00, it is still very difficult to locate a switch in a large network that specifies that the Mac is 00-e0-f9-16-28-00. A lengthy and error-prone method is to list all the MAC addresses of all catalyst switches, and a more efficien
informationRouter#show CDP nei; show neighbor informationRouter#reload; Start again!Router Password settings:router>enable; Enter privileged modeRouter#config terminal; Go to global configuration modeRouter (config) #hostname; set the hostname of the switchRouter (config) #enable secret xxx; set privileged encryption passwordRouter (config) #enable password xxb; set privileged non-secret passwordRouter (config) #line console 0; Enter the console port
server, network, security, and storage teams. inside VMware Virtual Center, the VM is configured the same as before. Now you don't need to define the network configuration in virtual Center, the port profile defined on the Cisco Nexus 1000V control engine can be displayed as a port group in virtual Center. Virtualization administrators can take advantage of pre-configured port groups to focus on VM management, while network administrators can use port profiles to configure a large number of po
, so that people can see at a glance what the page is doing. In addition, the title in the font and color, but also try to choose some simple, color single effect, so that the vision will be more pure.
For example: "The most professional DNF" theme station, in order to create the most rich and personalized professional system, the use of exquisite large title design, combined with a simple background, highlighting and not without losing beauty.
http://dnf.qq.com/act/a20141105career
not be able to connect. Next, check the port configuration to ensure that the port is available and configured with the correct VLAN. For best results, you should use a tool that supports 10/100/gig connections. However, typically 10/100 connected tools work. to handle network connectivity failures Step 3rd: Request a DHCP address once you have established a link, you can use the tool to request a DHCP address from the server. You should ensure that the assigned addresses match the correspo
supported. § When a packet from a virtual machine is sent out from the virtual switch, the corresponding token is added. § when these packets return to the virtual machine, the tokens are canceled. § minimal impact on performance. 650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/47/E6/wKioL1QC7qGguIsyAADeJPdhOkg680.jpg "style=" float: none; "title=" n8.jpg "alt=" Wkiol1qc7qgguisyaadejpdhokg680.jpg "/>650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/47/E4/wKiom1QC7YrAtBNGAAHP
+xArc bic angle of 2β=2arcsin (A/R)The Arc bic length is 2rβ
Attached code:
#include
Supplementary Proof
Re-describe the problem againOn the outside of the circle O as a tangent ab, ac,m for BC Midpoint, even am intersection o in P, F. Take a little q on the 劣弧 BC, and extend the AG to a circle o to D.Verification: P is the heart of ΔABC, ∠bqm+∠aqc=180°Proof: You can learn a little bit about the harmonic dots and the harmonic wiring harness .Because APMF is the harmonic point column, so CA, C
provider Edge: ISP, PSTN, Frame Relay/ATM.
7. There are two methods of implementing network change: ad hoc method and structured method.
The 4-medium model used in the 8.IT service lifecycle: Cisco Lifecycle Services (PPDIOO), ITIL, Fcaps, and TMN.
9. Develop an implementation plan, which is part of the network design phase, which includes the following:
A. Network information
B. Tools in Need
C. Resources required
D. Implementation of the mandate
E. Verification tasks
F. Performance m
Requirements: Suppose the AS65001 network is a telecommunication network AS65002 Network is a mobile network, the network segment 202.106.15.0 is the telecommunication service segment, the network 202.106.48.0 is the mobile service segment
Mutual access, and R4 can remotely control R1.
Configuration on R1:
R1#en
R1#conf T
R1 (config-if) #inter f1/0 Configure IP Address
R1 (config-if) #ip address 202.106.16.1 255.255.255.0
R1 (config-if) #no shut
R1 (config-if) #inter f0/0
R1 (config-if)
802.3AF supports two modes of power supply, 1236 or 4578. Supports 5 power supply levels:
0: Default 15.4W
1:4w
2:7w
3:15.4w
4: Not defined, extended use.
Cisco's previous Ethernet power was 6.3W
Cisco's previous Ethernet ┑ paragraph 跞, lt;br/>power panel uses 45, 78 power.
The inline power uses 12, 36, and needs to be combined with CDP.
Full support for 802.3AF products are as follows:
Catalyst 6000 Platform:
Ws-x6148-45af
Ws-x6148-21af
There are a lot of users using Cisco routers, So I studied the global debugging of Cisco routers and shared it with you here. I hope it will be useful to you. When configuring a Cisco router, the boundaries between global and interface commands are obvious. In this case, we use "Global" to identify commands that cannot be used for interface debugging or specific transmission media types and Protocol debugging.
For example, in the 2500 series Cisco routers, you can use Debugging commands to analy
.
Prevent Packet sniffing
Hackers often install the sniffing software on computers that have intruded into the network, monitor network data streams, and steal passwords, including SNMP communication passwords, as well as vro logon and privileged passwords, in this way, it is difficult for the network administrator to Ensure network security. Do not log on to the vro using non-encrypted protocols on untrusted networks. If the vro supports the encryption protocol, use SSH or KerberizedTelnet, or
route 0.0.0.0 0.0.0.0 dialer1No ip http server!Access-list 1 permit 192.168.0.0 0.0.255
2. You can use another Ethernet port to connect to the adsl modem and then connect to the line.
Hostname xxxxIp name-server x. x dns addressVpdn enableVpdn-group pppoeRequest-dialinProtocol pppoeInter f 0/0Ip add 192.168.0.1 255.255.255.0Ip nat insideInter f 0/1No ip addressPppoe enablePppoe-client dial-pool-number 1Inter dialer 1Mut 1492Ip address negotiatedIp nat outsideEncap pppNo ip mro
device for backup and storage management.
NetVault represents another trend in the Linux backup software field. It provides continuous data protection (CDP) through a feature called NetVault: Replicator ). This feature copies byte-level data changes through the LAN or WAN.
Data deduplication is also implemented through Data Domain and other companies in the Linux backup function. These companies provide Data deduplication technology as part of their
In the Router, there is a command: auto secure, which is convenient to use, and can disable some insecure services and enable some secure services. Then, the command is summarized. (Note: ios 12.3 (1) or later versions are supported)
Summary:
1. Disable some global insecure services as follows:
Finger
PAD
Small Servers
Bootp
HTTP service
Identification Service
CDP
NTP
Source Routing2. enable some global security services as follows:
Password-encryptio
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