The command line port of a cisco router uses a hierarchical structure, which requires logging on to different modes to complete detailed configuration tasks. From a security perspective, cisco IOS divides EXEC sessions into USER mode and privileged mode.
Features of the USER mode:
In USER mode, only basic monitoring commands are allowed. In this mode, the confi
Network security management involves many aspects. However, looking at many security events, we can draw a basic conclusion that the harm is caused by ignoring basic security measures. This article will discuss the importance of maintaining Cisco Router password security, explain the three modes of Cisco router IOS, an
In network management, we usually handle the problem about Cisco router DHCP. Our netizens also participated in some of the discussions. Here we will summarize them for your reference. There may be no specific mode to describe Cisco router DHCP problems, so the following questions and replies from netizens may not help
It is very important to know more about the configuration of Cisco routers. Here we mainly analyze the configuration steps of Cisco routers, have you ever encountered this problem: Because you forgot your password, you were forced to reject the original friendly "friend"-A vro or vswitch, and you were unable to reset parameters and collect statistics. The following describes how to clear passwords for sever
By David Davis CCIE, MCSE + I, scsa | more from David Davis CCIE, MCSE + I, scsa | published: 5/26/05Category: Home | audience: Networking Communications
Takeaway:It's critical that all devices on an organization's network display the accurate time and date. if they don't, things can go wrong in a hurry. david Davis explains why Cisco devices need to use Network Time Protocol (NTP) for their time synchronization needs, and he tells you how to configu
CISCO PT Simulation Experiment (11) router single-arm routing configurationExperimental Purpose : Master The configuration method of single-arm routingImplementing different VLANs to communicate with each otherIn-depth understanding of VLAN communication Principles and routing sub-interfacesExperimental Background :the company's technical and sales departments in different offices, technical department and
I. i0s process
The i0s process is a special software task that runs on a router and is used primarily to implement a function. When we configure i0s with the command-release profile, it is actually the same as controlling the behavior that makes up the 10S processes, all of which run concurrently on the router. The number and type of processes that can be run on one ro
This article describes in detail how to set the default settings for Cisco routers in terms of security analysis, specific measures, and default settings. I believe this article will help you.
Security Analysis
Readers who have experience configuring routers should know that network administrators often set access control lists on routers or switches to prevent viruses and hackers. By default, the "deny any" statement is added to the access control li
access vlan 4
Switch (config-if) # no shutdown
Switch (config-if) # exit
Switch (config) # interface f0/3
Switch (config-if) # switchport mode trunk sets this port to relay mode)
Switch (config-if) # no shutdown
Witch (config-if) # exit. You can directly use ctrl + z or end to exit the privileged mode)
2. Configure single-arm routing on vrocisco Cisco 2611)
Router # con
There are many things worth learning about the configuration mode of a Cisco router. Here we mainly introduce the mode of user execution and privilege of a Cisco router. Ping is the most commonly used troubleshooting command. It consists of a group of ICMP response request packets. If the network runs normally, a group
Basic configurations of Cisco routers and switches: www.2cto.com Router> \ enter the user mode Router when the vro is started> enable \ type the command to enter the Router mode # \ This display mode indicates that the Router mode has been entered # configure terminal \ type
When a Cisco router forgets or loses the enable password, there are two methods to restore it, depending on the series of products you are using.
Method 1
You can use this method to restore the following vrouters: cisco 2000 Series, 2500 series, 3000 series, Cisco 680 series with 4000x0 Motorola CPU, and 10.0 series r
Cisco router Startup ProcessThe Startup Process of a Cisco router is divided into four main stages: 1. execute POST 2. load the bootstrap program 3. search for and load Cisco IOS software 4. find and load the startup configuration file, or enter the setup Mode 1. executing P
Before giving you a detailed introduction to the Cisco router ACL, first let everyone know about the ACL, and then give a full introduction to the mask to block the scam attack. Wildcard-mask wildcard mask in the Cisco router ACL Access Control List ).
Brief: The wildcard mask (or anti-mask) used in the
It is very important to know some questions about Cisco router configuration. So I have studied the detailed introduction of Cisco router configuration statements, and I will share them with you here, hoping to help you. Cisco routers once dominated enterprise wide area netw
Analysis of Cisco router IOS backup and recovery
Introduction:
I. Wiring
Serial Interface-> console and pc Nic interfaces-> F0/0
// The IP address of the PC and the F0/0 interface (of course, other interfaces can be connected to the network cable). The IP address can be in the same network segment. You can also use an Internet ip address!
Ii. Tools
3 CDaemon (tftp server) and CRT (access routing tool)
Iii.
Here we will mainly introduce the configuration and initial installation of Cisco routers. Describes how to configure Cisco router settings and remote access, this article discusses how to use the DHCP service function of the internal network to allocate address information for users who remotely dial in and how to troubleshoot common vro faults.
1. Initial insta
This article uses a specific example to illustrate how to configure the access to ADSL through the vro. What problems should we pay attention to during access? The following articles will benefit you a lot.
Note: In this case, a common adsl modem and a cisco 25001841) router (dual Ethernet port) and IOS 12.2 (15) T need to be used to connect to the China Telecom adsl PPPoE, able to achieve LAN Internet shar
With the development of China's routing industry, Wireless routers are also widely used. Here we mainly explain a new Wireless-N Wireless router launched by Cisco, cisco Wireless Router WRT320NWRT320N is the latest Wireless-N Wireless router launched by Linksys. This product
-list 10 deny 192.168.1.0 0.0.255Router (Config) # access-list 10 permit any! The router is prohibited from receiving and updating the route information of the 192.168.1.0 network.Router (Config) # router ospf 100Router (Config-router) # distribute-list 10 in! Disable router forwarding to spread route information of 19
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