CISCO Router ISSUE 100

The CCNA I took two years ago is now basically deserted, and the command is forgotten, but it should be no problem to ask me to configure, because it can be used"?", I'll probably say it.,The main thing is switch support.,If it's routing, there's no problem.,You first draw a VLAN.,Then install a firewall on the computer.,See what ports and what protocols those software take.,And then configure the firewall of the switch (I don't know if your switch supports),Only use the port of that software and the common port.。

The configuration command is available on the Internet, you can use Boson to simulate the configuration first, and Boson must be registered with a keygen.

What you said through the Cisco router should not be possible.

Through the router, different VLANs in the LAN can go through different Internet exits, but the performance requirements of the router are relatively high, and there are still special load balancing equipment F5 and so on.

Static load, you can turn different PCs into dedicated to different functions, such as PC1 dedicated IIS services, etc., commands, and convert their internal IP addresses into external IP addresses + ports.

Example: ip nat inside static: 80

In this way, the private address corresponds to the HTTP service of your public address.

You have to divide the VLAN, depending on which Cisco router you use

First of all, let's explain the meaning of the word login!

login: the meaning of user login.

There are two ways to log in on Cisco's devices:

One is the local mode, which uses the console port;

One is the remote mode (or network mode): telnet and other 1By default, Cisco remote access is prohibited.

In order to access Cisco devices remotely (networked), you must turn on the Allow Remote Access switch, which is the login command. Once login is enabled, you will also need to set a password to remotely access Cisco devices completely normally just to be on the safe side!

cisco(config) line vty 0 4cisco(config-line) password ciscocisco(config-line) logincisco(config-line) exit method: By default, you can access Cisco devices without any configuration. However, there are security risks, as long as anyone has a console cable, connects the computer and the Cisco device, and does not need to enter any information, they can log in directly to the Cisco device, in order to eliminate this effect, we usually do a similar configuration for the console port.

Set a password and turn on the login switch to prevent malicious logins!

cisco(config)# line console 0cisco(config-line)#password ciscocisco(config-line)# logincisco(config-line)# exit

Remote login.

There is no need to enter the data center for configuration.

The picture above is a Cisco router, and the biggest difference between the router and the switch in form factor is:Number of interfaces

If there is a large number of interfaces: a switch.

If the number of interfaces is small: routers.

The first thing we need to know about routers is:console port

This blue one isconsole port, which he uses to connect directly with the computer.

It's a lot like a network cable interface though. But it is not a network cable interface, and if you want to connect to the computer through it, you must have a special cable.

The one on the left is connected to the computer, and the one on the right is connected to the router. You can get up in the middle:

ButMore convenient or Bluetooth port

Secondly, you have to figure out where its network port is:

GE is the network port, GE (Gigabit Ethernet) Gigabit Ethernet (1000MB).

The corresponding is FE (Fast Ethernet) and is expressed as 100 megabits (100 MB).

At home... tp-link is very good, the cover is only round, Cisco is enterprise-level, the quality is the best, 3l, don't talk nonsense, at present, Cisco is still unsurpassed in terms of routing and switching, what domestic brands are macro, completely plagiarizing Cisco equipment, but changed the order, and Cisco's private protocol, domestic equipment can support? EIGRP is known as the fastest convergence routing protocol Can the domestic system support it?

If an enterprise is relatively large and needs more routing tables, Cisco's can run perfectly, and the domestic equipment wants to support the core layer of a large enterprise network, don't you wait to burn it out? PVRST+ is the fastest protocol that provides spanning trees for individual VLANs Domestic devices are not supported, and there are switching methods Domestic ones are all centralized** Only Cisco devices use distributed** **The rate difference is always double or two.

The Cisco Router is an integrated services router, a benefits integrated services network router, and a network router that pays off.

Advantage: The value of a systems approach.

The systems approach starts with a single always-on platform, such as Cisco's integrated multi-service registry router. The system approach combines intelligent services within and between them, packaging, weaving voice, security, routing and application services to make the program more automated and intelligent.

With the integration of the Services Router, Cisco provides a comprehensive, future-proof solution that minimizes network disruption and ensures access to the most business-critical applications. Cisco's focus on combining performance with new infrastructure services is to enable companies to create networks that are smarter, more resilient, and more reliable.

For the need for fast, secure access at all scales, today's mission is to serve as the foundation and key applications for future growth, Cisco Router Organization:

embed security and voice services into a single routing system;

Adopt an integrated systems approach to embedded services, application deployment speed, reduced operational costs and complexity;

Deliver unmatched service performance and investment protection;

Different specialized gadgets, Cisco Integrated Services Routers are embedded as a single resilient system, facilitating the deployment of simplified management, security, and voice services, and reducing operational costs. Cisco routers provide the secure communications solutions you need today, while providing the foundation for tomorrow's intelligent information networks.

In addition, Cisco Integrated Services Routers:

Provide fast, all-in-one access to mission-critical business applications and unmatched investment protection for future growth, enabling enterprises to easily deploy and manage converged, communications solutions that get end-user productivity end-to-end security;

Features industry-leading service density, bandwidth, availability and maximum configuration flexibility and scalability performance options in the most demanding network environments;

The voice capacity and wide range of services provided make it easy for customers to achieve end-to-end, best-in-class IP communication solutions, while providing a foundation for future growth and investment protection;

is the only router that allows enterprises to build a smart, self-defending network foundation with the best service, best-in-class security and routing with the lowest total cost of ownership technology and the highest return on investment.

Cisco is smiling? There is nothing wrong with routing such electronic products, there is no need to make a conscious choice, just buy one.

This one is not bad either. Bend Han. Fights.

I don't know, that's how it should be.

It is equivalent to the black box of the router, and according to the information inside, it is constantly analyzed and summarized to find out the cause and avoid the rebirth of the fault.

Important troubleshooting commands that you need to use when your Cisco router crashes.

Show Version: This command displays available information including the router's hardware configuration, Cisco Internet OS version, memory, interfaces, and more. It may just be a hardware bug that causes the router to crash.

This information can also help you understand which version your router is running, as well as how much memory and flash memory is available.

Show stacks: This is also a very useful command that can be used to monitor stack usage and interrupt routines. This command can display information at times such as bus errors or software-induced crashes.

Show Context: This command can save information such as the reason for rebooting the system and stack trace information, and in addition to the core dump information, the Cisco Technical Assistance Center may ask you to provide the information displayed by the show tech-support command. This command displays configuration, statistics, and other information and logs in to the router.

The most recommended mode is to use File Transfer Protocol (FTP), so this article will provide configuration in this case. By the way, whether you're using FTP, RCP, or any other method like the above, make sure the protocol is working properly before creating a core dump file. In other words, before using the pattern, do a test to make sure the system is functioning properly.

For example, you can test that the File Transfer Protocol is working reliably by copying the router's configuration to the server that is set to save the core dump files

router# copy running-config ftp

Since there is no reboot, you need to manually create the core dump file, enter the following command in global mode:

This command is useful in cases where the router is out of order and not the Cisco router crashes. Note this, it will dump all the information in memory, not just the information in use, so it's important to make sure you have enough memory to accept the relevant information. And, I don't recommend doing this for a running router.

The steps to go into the Cisco router configuration and install the settings are as follows:

1. First of all, after connecting the wireless router, you need to check whether it is powered on and whether the wireless router is running normally.

2. After checking that it is correct, open the browser and enter: press Enter to enter, at this time a dialog box pops up, you need to enter the account name and password, there will be in the back of the router, in general: account name:

admin password: admin.

3. After entering the password behind the router, you can log in to the settings page of the router.

4. Click on the setup wizard on the page and follow its requirements step by step.

5. Click Next to enter the account password setting, this account password is the account password of the current network network, if you don't know, you can consult the network operator.

6. After setting the account and password for surfing the Internet, the function of wireless Internet access is set, set the wifi name and wifi password, it is recommended that the password is not too simple, it is easy to be cracked, and the encryption method can be recommended by the system.

7. Click Done, restart the router, and the settings have been successful.

1，rip、ospf、is-is、igrp、eigrp、bgp

2. They are all shared LANs with shared media and bandwidth.