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When routers and switches work normally, you do not need to worry too much about wiring issues. However, when the network encounters problems or changes, wiring knowledge may be of great help to you. In this article, we will introduce you to some basic wiring knowledge, and describe the details of the Cisco console dedicated network cable. The network cable belongs to the first layer of the Network: physical layer. Only the correct network cable can e

Visio OS opera linux ieCisco Systems IOS is vulnerable to a denial-of-service attack using ICMPRedirect messages.When flooded with ICMP redirect messages, the IOS uses up all its memoryTo store the new host routes. The device is then unable to performOperations that need additional memory such as processing ing routing updatesAnd accepting inbound telnet (1) connections.DETAILSKnown vulnerable combinations:* Cisco 1005 with IOS 11.0 (18)*

Fast Ethernet and Gigabit Ethernet line cards The Cisco Catalyst 4500 series scalable, modular, and high-density switches provide second, third, and fourth-layer switches and intelligent services with outstanding performance, enabling network control and permanent deployment. These switches provide a variety of Fast Ethernet and Gigabit Ethernet line cards, including desktops, branch backbone and servers for enterprise and commercial exchange solution

A technology, especially network-centric and communication-centric technology, has its own transmission protocol. Now we will introduce some knowledge about Cisco Unified Communication Protocols. So what is SIP when Cisco's unified communication protocol is used? Why is it used? Support for the SIP protocol in Cisco Unified CommunicationThe SIP Protocol provides a standard-based IP communication method for

The Cisco PIX 506E Firewall is an enhanced version of the most widely used Cisco PIX 506 Firewall, providing enterprise-class security for remote offices and branches through a robust, robust security device. The Cisco PIX 506E Firewall is part of the market-leading Cisco PIX Firewall series, offering rich security fea

The Cisco PIX 506E Firewall is an enhanced version of the most widely used Cisco PIX 506 Firewall, providing enterprise-class security for remote offices and branches through a robust, robust security device. The Cisco PIX 506E Firewall is part of the market-leading Cisco PIX Firewall series, offering rich security fea

Welcome to the network technology community forum, and interact with 2 million technical staff to enter the settings and skills of the two CISCO switches, mainly: Cisco switch setup skills to find the MAC address corresponding to the IP address, cisco switch setup tips: Find the port corresponding to the MAC address on the switch. The IP address of a machine is k

When using a cisco router as an Internet Router, cisco's IP packet filtering function is generally used to count IP traffic. The method is to add the ipaccountingoutput-packets command at each entrance of the cisco router. The cisco router automatically counts the IP traffic of these ports. Common snmp or telnet terminal simulation (showipaccount) methods to obta

After decades of development, from the first four-node ARPANET to the ubiquitous Internet, computer networks have penetrated into our lives. With the explosive growth of the computer network scale, as a router to connect devices also become more important. When a company builds a network, how to reasonably configure and manage the router becomes one of the important tasks of the Network Manager. This topic describes how to configure a cisco router fro

Install Cisco Packet Tracer in Linux What is Cisco Packet tracer? Cisco Packet Tracer is a powerful network simulation tool used for Cisco authentication training. It provides us with a good interface view for various routers and network devices. These simulation devices have many options. Like physical machines, we c

transfer to a directly connected network destination host.Routing:To implement a router you need to know: Destination address, source address, all possible paths, best routing path, manage routing information (that is, store non-optimal routing path)Administrative distance (administrative Distance):The management distance mainly shows the credibility between different routing protocols. The path where the optimal route is selected when there are multiple reachable path conditions.• The range of

Cisco switch QoS Speed limit configuration steps:1. Enable Global QoS2. Set the ACL matching traffic3. Set a class-map to match the ACL set in the second step4, set a Policy-map match Class-map, and then define a series of policies here, limit the bandwidth bitwise (BIT) for the calculation, burst in bytes (byte) calculation5, apply the POLICY-MAP to the corresponding interfaceMLS QoSIP Access-list Extended list83Permit IP host 192.168.120.83 anyClass

A Cisco 4506 switch in the user's actual environment could not log on, and the system could only be cracked because the maintenance staff did not remember the modified password.Environment:Cisco Catalyst 4506E switch, engine for WS-X45-SUP8-E, system version is cat4500es8-universal-mCrack steps:To restart the switch, press CTRL + C to abort the switch's boot process as follows:Verifying FPGA (P) Signature ......... ....... PASSEDVerifying ROMMON (P) S

. The switch works on the second layer of the OSI Reference Model, the data link layer. The CPU inside the switch is connected to each port successfully, and the MAC address and port correspond to form a Mac table. In future communications, packets destined for that MAC address will be sent only to their corresponding port, not all ports. Therefore, the switch can be used to divide the data link layer broadcast, namely the conflict domain, but it cannot divide the network layer broadcast, namely

192.168.61.128 as the remote server IP address of GNS3, perhaps everyone is more curious about the configuration of the address there is no need to pay attention to the place, the answer is there, as long as the IP address to the IOU virtual machine IP address.In fact, this place is currently reserved for IOU settings. You can simply think that GNS3 can not only use the local dynamips as iOS running server, it can also designate a remote UNIX virtual machine as a GNS3 server, let the server run

Although the 12 series AP has been eliminated, but like our company with no money for 10 years but still in use, fortunately it has the value of learning, or can be seen from the 12 series of APS some Cisco deployment of wireless ideas.First spit trough a bit of the domestic often said fat, thin ap of this argument, because when using Thin/thick mode to Google, often do not search the results, so first to tidy up the fat and thin what is it?Fat AP, to

"Data Collation" Cisco [ACL]Access-list{1) Standardaccesslist:range: (1to99) check: Ipusage:access-listaccess-list-number{permit|deny}source[wildcard-mask]test conditions:Checkalltheaddressbits (Matchall) anip hostaddress,i.e.192.168.20.330.0.0.0//equivalent to:host192.168.20.330.0.0.0-> checkallbitsTestconditions:Ignorealltheaddressbits (Matchany) anyiphostaddress,i.e.0.0.0.0255.255.255.255//equivalent to: any255.255.255.255- >ignoreallbits#1Permitmy

"Data Collation" Cisco [Shell, Command]Promotmode{usermode:router> (input:enable) privilegemode:router# (input:conft) Globalconfigmode:router (Config) #----ctrl-z->pm,exit-> Gcminterface:router (config-if) #Sub-interface:router (config-subif) #Controller: Router (config-controller) #Line: Router (config-line) #Router: Router (config-router) #IPX router:router (config-ipx-router) #}command{ NBSP;1) privilegeenable//enters the privileged mode from user

"Data Collation" Cisco [VLAN]VLAN{ISL (Inter-switchlink) 802.1qVTP (vlantrunkingprotocol):server,client, transparent# build VlanS1 (config) #vlan 2s1 (Config-vlan) #name saless1 (config) #vlan 3s1 (Config-vlan) # namemarketing# assigning interface S1 (config) #int f0/1s1 (config-if) #switchport modeaccesss1 (config-if) # switchportaccessvlan2switchportmode/access permanent non-trunk mode/ dynamicauto default mode/dynamicdesirable If the neighbor inter

GNS3 with IOU simulation degree is very high, but in doing the experiment, still will encounter many problems;The following are some of the recent problems encountered in the experiment, in the learning process will continue to update; When doing NTP, a router do NTP master, another router do NTP client to synchronize, the settings are correct, in the Cisco Packet Tracer configuration can pass, in IOU, a router is always unable to sync to The ti