cisco 1921 router

Cisco router has become a commonly used network device, but we are not very clear about its storage classification. Here we will introduce it in detail. Memory category: 1: RAM: Random Access to memory, equivalent to computer memory 2: ROM: read-only memory. Some microcodes used to start and maintain the router are resident in the ROM. 3: FLASH Memory, equiva

: single two-way authentication: www.2cto.com 2.2, CHAP authentication: CHAP: Challenge Handshake Authentication Protocol, full name: challenge Handshake Authentication Protocol. CHAP verifies the identity of the authenticated end through a three-way handshake. It is completed when the initial link is established. To improve security, it is periodically verified after the link is established. CHAP is safer than PAP because CHAP does not send plain text online, but instead sends a random number s

we are using Console connect the router and the computer, start the router and use the Putty connect to the router's console ( Console ), it is recommended that you first configure the hostname of the router ( hostname ) To facilitate identification, configure the privileged mode ( Enable ) Password and vty ( telnet ) password to protect the

This article uses VPN technology to achieve interconnection between two parts of the network, simulate ISP, close to practicality, the article mainly shows us the specific operation steps, mainly the input of basic commands. In this experiment, we use the Cisco 2600 router and VPN technology to achieve the network interconnection between one branch and two parts. To stay close to practicality, we still use

Router Access ADSL configuration detailed 1, Cisco router connection to the ADSL modem configuration: Note: The case for Beijing Telecom ADSL PPPoE access, need to use a common ADSL modem and a Cisco 2500 router (dual Ethernet port), IOS 12.2 (T), Be able to realize LAN sha

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

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

Cisco router security-TCP connections are common attacks on the network. In fact, most attacks are based on TCP connections, and a large amount of request data is sent to cause Server Denial of Service, is a connection attack. Next, I will take a Cisco router as an example to introduce how to intercept illegal TCP conn

...Writing monlib sectors........................................................................................................Monlib Write complete Format:all system sectors written. Ok...Format:operation completed successfully. Format of Flash:completeProgram load complete, entry point:0x8000f000, size:0xcb80(5) TFTP to see if iOS upload is complete.(6) Rommon 8 > Reset//Restart routerCisco

Cisco router IOS upload and download 1. Prepare a console line and a network cable. The connection cable is connected to the console port of the computer. The network cable is connected to the computer and the F0/0 port of the router. (Only F0/0 can be used. The router has no system, the IP address configured for the

To emulate the password of the reset router with the Cisco Packet Tracer Simulator, the packet tracer default router port is off and needs to be manually enabled 650) this.width=650; "Src=" http://s3.51cto.com/ Wyfs02/m01/5a/21/wkiol1t3xxiqjwmeaakcapd2ghs648.jpg "title=" 2.png "alt=" Wkiol1t3xxiqjwmeaakcapd2ghs648.jpg "/>1. Shut down the

There are still many things worth learning about the Cisco router configuration mode. Here we will mainly introduce how to enter the detailed steps of the Cisco router configuration mode. In the Cisco router configuration mode, th

Topology map: 1. Configure the router R4 as a Frame relay switch Frame-relay switching * configured as Frame Relay switch 2. Configure the interface's clock frequency, package type, LMI type and Frame Relay DCE on the router R4 int s0/0 No shut Clock rate 64000 * Set clock frequency Encapsulation Frame-relay * Encapsulated as Frame Relay Frame-relay lmi-type

How should we connect to the Cisco router port? Many people want to know the specific role of the control port and the Auxiliary port. The port content is not detailed on the network. Here is just a few words about the port. The Cisco router port has a control port: the control port console port) and the Auxiliary port

Dynamic and robust routing is extremely important for Internet networks. Therefore, any network engineer who is first involved in this field must not only understand the concept of routing, but also be able to control it in a real environment. However, the products provided by high-end network equipment suppliers such as Cisco in the routing field are all over the world. This means that most people can only learn routes in school or laboratory environ

Some time ago, someone familiar with me asked me how to set up a bridge on a Cisco router )? At that time, due to the relationship between work, I just briefly talked to him. Today, we set up a Cisco router as a complete configuration command for bridging. Through this instance, you can learn how to use a

address of the TFTP server be entered. After the Server IP address is correctly entered, the router also requires the network administrator to provide the configuration file name to be backed up. Generally, we recommend that you use a file name that is easily remembered by the Administrator. At this time, the router will prompt the Administrator to press YES to confirm the operation. 3. copy tftp running-c

Netizens have their own preferences for Cisco router simulation software. The following describes three software models. I hope you can give it a try and give it a better reference to more friends. Everyone should know that the price of a router is very expensive, and it is very expensive to build a router lab. Howeve

Many people may not have a special understanding of Cisco router configuration, so I have studied the detailed knowledge of Cisco router configuration. I will share it with you here, hoping it will be useful to you. Have you ever encountered a situation where you have modified the