"hard" operations on network devices. The security factor is high, but the obtained information is not accurate. For example, if the IP address of a server has been changed, we can think that the server is not connected to the network because the original IP address cannot be found on the switch. The system administrator first checks the IP address information on the server, and then finds out which port of the s
relay mode on the port connecting a switch to a vswitch or connecting a vswitch to a vro, this enables data frames belonging to different VLANs to be transmitted through this relay link.
The frame format of VLAN relay is divided into two types: ISL (Inter-Switch Link, connection between switches) and 802.1Q. The former is the protocol unique to the Cisco
Pen name is also large, the motto of the gameToday it is the command of the Cisco switch which is the practice of the work operation, I feel that sometimes it may be necessary to trace the port of which the MAC address belongs to the switching device, and to determine the object quickly, I share my exercise to the lovers who need it.The first thing you need to know is the IP address and account password of
Tags: cisco switch password resetCisco switch, what do we do when we forget its login password? How do I clear its password? principle: Enter the bottom of the switch, by modifying the switch original profile name, after restarting the s
and a switch are connected with the console lineHow it works: Switch password recovery fundamentals: Change the Config.text file name in the switch to a different file name, and then enter the configuration mode to change the password, and finally restore the Config.text file nameSteps:1. Power off first2. Power off while holding down the mode key on the
Lab Environment:650) this.width=650; "alt=" Cisco Packet Tracert three-tier switch VLAN configuration-Ibm.chick-mingkang.zhou "src=" Http://img2.ph.126.net/2N Qfixjyba1gdiqtbuknhq==/6630601572768576164.png "style=" border:0px;height:auto;margin:0px 10px 0px 0px; "/>Experimental Purpose:1, the three layer switch divides three VLANs, is Vlan2\vnal3\vlan4, and the V
When switching data frames, a switch can select different modes to meet network and user needs. Cisco switches provide three switching modes:
Storage forwarding Mode
The Store-and-forward mode means that the switch can complete the entire data frame and perform the forwarding operation only after the CRC verification is passed. If CRC verification fails, that
When configuring the Cisco 3560 switch in the morning with the Cisco Packet Tracer practice, it is found that the IP address of the port cannot be configured in port configuration mode.Switch>Switch>enableSwitch#configure TerminalSwitch (config) #interface F0/1Switch (config-if) #?DhcpOnly DHCP commands are available.
Use a cisco router to simulate how to configure a frame relay switch (configure 3640 as a frame relay switch): 3640 (config) # frame-relay switching ---------------------- enable the frame relay switching function of the router 3640 (config) # int s0/0 ------------------------------------- enter the s0/0 interface 3640 (config-if) # no ip add --------------------
Upgrade object: WS-C3750-24TS-E Ingredients: Cisco TFTP server, one cable (connecting hosts and switches), my ThinkPad Local Area Connection: 2.2.2.1 3750-vlan 1:2.2.2.2 Telnet to the switch for configuration 1. Setting up a TFTP server Close other network connections on the host to ensure that the TFTP server address is a locally attached IP (2.2.2.1). Copy the new iOS to the TFTP server root directory.
Cisco switch recover master diskRecovering from a Software Failure1. download the system image from the cisco website. The cco account is required. unzip the system image, decompress the unzipping is binary executable binfile Unix using tar-tvf command unzip unix-1 % tar-tvf image_filename.tarunix-1 % ls-l image_filename.bin3. select 96004 at the speed of the con
Configuration of a layer-3 Cisco switch 1. Start a route on a layer-3 switch. Otherwise, layer-3 switch does not have the routing function switch (config) # ip routing2. Configure the VLAN ip address switch (config) # interface vl
Encapsulation Frame-relay boot Frame Relay Package
Encapsulation Novell-ether rules the Novell unique format used on the network segment
Encapsulation PPP set PPP to the encapsulation method used by the serial port or ISDN interface
Encapsulation SAP rules the Ethernet 802.2 format used on the network segment the Cisco password is SAP
End Exit Configuration mode
Erase Remove flash memory or configure cache
Erase Startup-config Delete the conte
The IT Certification Examination Resources Network has collected a number of training materials for Cisco agents, including answers to pre-sales questions concerning routers, switches, IP/TV, firewalls, VPNs, network management, HFCs, VOIP, and equipment procurement., it can also be used as an entry-level document.12. Question: Which switches Does Cisco currently support layer-3 switching?Answer: Catalyst 2
The Cisco router switch sets automatic backup for IOS files and restores the automatic backup and rollback of Cisco IOS configuration files. The archive configuration mode function of IOS is required. Generally, only IOS versions 12.3 (4) All commands for automatic backup of the Cisco IOS configuration file are as foll
want to initialize the switch, you need to enter the Privileged EXEC mode. Enter setup in the command prompt symbol to start the initialization operation.The Privileged EXEC mode is introduced just now. In this case, we need to talk about several modes of machine change. Different modes can execute different operation commands. First, we need to talk about two basic modes.For the sake of security, CISCO di
Cisco 3550 switch stp learning notes STP (Spanning Tree Protocol) (IEEE 802.1D) Spanning Tree Protocol-review the working principles of SW: 1. the frame it forwards cannot be modified. create a MAC-PORT ing table based on source MAC learning. forward the frames in the target MAC ing table directly from the corresponding port. for frames without target MAC ing/Target wide (Group) broadcasting, SW learns diff
interruptRommon 1 > "Interrupt"2.2go in Rommon mode start using the command configuration as follows Step:Rommon 1 > Confreg Choose y or N below the word bad I'll tell Y or N in the order of choice. Excuse me. The order is as follows: 1. Y 2.N 3.N 4.N 5.N 6.N 7.Y 8.N 9.N 10.N650) this.width=650; "style=" Float:none; "title=" 123.png "src=" http://s3.51cto.com/wyfs02/M02/71/37/ Wkiom1xjr8dtoehaaagcy3dy9aw290.jpg "alt=" Wkiom1xjr8dtoehaaagcy3dy9aw290.jpg "/>650) this.width=650; "style=" Float:non
message are correctIf a large number of messages are sent, the network bandwidth will be exhausted to form another Denial-of-Service attack.3. The client can specify the IP address at will.The client does not have to use the DHCP service. It can set IP addresses in a static way. If any,This will greatly increase the possibility of network IP address conflict.II. Introduction to DHCP Snooping TechnologyDHCP Snooping is a DHCP security feature. Cisco s
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