The Fiber jumper (also known as the optical fiber connector), which is the optical connector to access the optical module, also has many kinds, and can not be mutually used. The SFP module is connected to the LC fibre optic connector, while the GBIC is connected to the SC fiber optic connector. The following is a detailed description of several commonly used optical fiber connectors in Network engineering: ①FC Type fiber jumper: The external streng
Of the six Ethernet switches we tested, the Edimax es-5800r and LeaPComm6004 switches are not managed switches, Accton ES4508, and the Thinker3800 switches of the creators are all network-management switches, 3Com 4900 is to support the three-layer and four-layer switch, Shenzhou digital D-link DGS3308TG is a three-tier switch.
Performance is the brunt
The 6 products include all copper ports, all fiber ports, and gbic ports, of which 3Com 4900 has 1
, easy installation, simple maintenance, stable and reliable performance, and a large space for upgrading. It provides high-speed access to the Internet, which is especially suitable for a variety of stand-alone, lan and Internet games. It is more suitable for game enthusiasts.
The main devices required for networking are one adsl moodem, one Broadband Router, and two switches. In consideration of security, we also need to install a hardware firewall.
The topology is as follows:
P
With the development of China's wireless routing industry, we have also promoted the upgrade of the wireless router technology. Here we mainly explain the wireless router's network security and ease of use. WPN824 has rich functions, it inherits the traditional advantages and features of NETGEAR and has a simple and easy-to-use WEB configuration interface.
In addition to the basic functions of WLAN gateway, it also provides advanced functions such as
ProSAFE NMS300 Security Vulnerability exploitation Guide
A security researcher has released Code stating that two critical security vulnerabilities are available in the Netgear ProSAFE NMS300 network management system.
Are you using the Netgear ProSAFE NMS300 Management System? If the answer is yes, you may have to worry about it-because Pefro Ribeiro, a security researcher, has discovered two serious s
1, Catalyst 35500XL/2950XL stack is how to achieve?
A. Special tiered cabling is required, 1 m long or 50 cm long (cab-gs-1m or cab-gs-50cm) and a dedicated gigabit stacked card Gigastack GBIC (WS-X3550-XL) (which already contains cab-gs-50cm stacked cables).
B. There are 2 stacking methods available: Daisy Chain (providing 1G of bandwidth) or point-to-point method (2G bandwidth available).
C. 2 ways to do backups.
D. Daisy chain method can suppor
A. About stacking technology: How does the 1.Catalyst 3500XL/2900XL stack be implemented?
A. Special tiered cabling is required, 1 m long or 50 cm long (cab-gs-1m or cab-gs-50cm) and a dedicated gigabit stacked card Gigastack GBIC (WS-X3500-XL) (which already contains cab-gs-50cm stacked cables).
B. There are 2 stacking methods available: Daisy Chain (providing 1G of bandwidth) or point-to-point method (2G bandwidth available).
C. 2 ways to do back
cracking tool for a week. This may be useful to most people, but Bill is an information security guy. The WPA key is likely to contain more than 32 characters.
At this point, you may wonder why I didn't use Java's 0-day vulnerability to attack him, and then enjoy my beer. The answer is simple-I know my goal. He is dedicated to scanning, repairing, and repeating spells. I have a browser 0-day vulnerability, And I won it last week.
After I visited Bill's website, I left with some useful informat
BGP experiment, you can even use this configuration to establish full-network connectivity, and then create a tunnel port to implement the experiment topology. During remote configuration, you can save multiple configuration files and switch between them. The configuration file named router-confg can be used as a final backup-if you accidentally delete the configuration, there will still be an available configuration after the system restarts.Conclusion: The initial enchanting phenomenon is cau
port is in the err-disable State because it detects a loop on port 20th.
Check the port status
Switch # showinterfa0/20 status
PortNameStatusVlanDuplexSpeedType
Fa0/20linktodatabackuperr-disabled562auto10/100 BaseTX
This more clearly implies that the port is in the err-disabled state.
Now that the port is in the wrong state, we should have a step to repeat it into a normal state.
Save pace 2: Configure the port from the error status
Go to the Global Setting Mode of the switch and run errdisable
)ConfigurationNative VLAN (802.1q) Switch (config-if) # switchport trunk native vlan-num // The trunk port that encapsulates 802.1q can accept data streams with or without tags,VswitchTransmits unlabeled data streams to the native vlan. By default, the native VLAN is VLAN 1. Use no switchport trunk native vlan PortConfigurationThe command returns to the default status. (6)ConfigurationA group of Ports 4006 # configure terminal 4006 (config) # interface range fastethernet2/1-5 4006 (config-if-ran
CISCO 6509 core switch WS-C6509-1300AC = Catalyst 6509 Chassis w/1300 w ac Power SupplyRedundant Power WS-CAC-1300W/2 Catalyst 6000 Second 1300 w ac Power SupplySwitch Engine WS-X6K-S2-MSFC2 Catalyst 6500 Supervisor Engine-2, 2GE, plus MSFC-2/PFC-2Redundant switching engine WS-X6K-S2-MSFC2/2 Catalyst 6500 Red. Sup2, 2GE, MSFC2 and PFC2 (In Chassis Only)Backplane expansion Module WS-C6500-SFM Catalyst 6500 Switch Fabric ModuleElectrical port module WS-X6316-GE-TX Catalyst 6000 16-port 1000TX GE M
Fvx538/fvs338V2.0 how to deploy remote access to the enterprise VPN using Xauth Technology
1. Tutorial Purpose2. Understand Xauth applications3. experiment environment4. Experiment operations. Select the appropriate RADIUS service4.2.fvx538 firewall Xauth configuration...4.2.1. Set the Xauth mode of the VPN firewall...4.2.2. Configure the VPN to prevent fire and use the local database for verification4.3.configure the IPSec VPN Client Software Xauth4. Test the connection
1.1 tutorial Purpose
Th
are gateway devices and implement the NAT Function of broadband shared access. Most of them are client software of a third-party DDNS service provider integrated into the sub-device. For example, NETGEAR) The FVL328 VPN firewall, a VPN product of the company, integrates the DDNS client of the domain company.
DDNS-based VPN is simple and easy, but the reliability cannot be guaranteed. If the DDNS service provider stops the service or the service is un
the NAT feature of broadband shared access, most of which are integrated with a Third-party DDNS service provider's client software inside the machine. such as Network (NETGEAR) company's VPN products FVL328 VPN firewall on the integration of the network domain company's Peanut shell DDNS client.
VPN based on DDNS is easy to do, but the reliability is not guaranteed, if the DDNS service provider stops the service or the service is unstable, the VPN
VLAN 1. Use the no switchport trunk native vlan port configuration command to return to the default status.
6) configure a group of Ports
4006 # configure terminal
4006 (config) # interface range fastethernet2/1-5
4006 (config-if-range) # no shutdown
// Note: a space must be added between the port numbers. For example, interface range fastethernet 2/1-5 is valid, while interface range fastethernet 2/1-5 is invalid.
The following example shows how to configure groups
Investment Protection and Development Options
With the development and changes of the Enterprise, you can leverage the Scalable Cisco stack architecture to ensure the synchronous development of your LAN. Cisco provides the industry's most flexible, scalable, and manageable stacking architecture for the Catalyst 3500 XL series and the Catalyst 2900 XL series switches with gigabit performance. You can create a switch stack in the same wiring room, or use the Cisco switch cluster technology to crea
Comprehensive example of configuring layer-3 Switching
This configuration has no problems.
As long as you can understand and remember the key commands, I believe you have a deeper understanding of Layer 3.
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Basic Network Conditions
The network topology is as follows: the center switch uses Cisco Catalyst 4006-S3,
Supervisor Engine iii g Engine is located in 1st slots for layer-3 switching; one 24-Port
The 1000Base-T module is l
Basic information of the network
The network topology is: The central switch uses Cisco Catalyst 4006-s3,supervisor Engine III G engine in the 1th slot, for three-layer exchange, 1 24-Port 1000base-t module in the 2nd slot, for connecting to the network server; The 1 Block 6 Port 1000base-x module is located in the 3rd slot for connecting 6 backbone switches. One switch uses Cisco Catalyst 3550-24-emi and installs 1 1000base-x gbic Gigabit modules. A
Some knowledge about storageAccording to the different transmission protocols, the network card can be divided into three kinds, one is the Ethernet card, the second is the FC network card, the third is the iSCSI network card.
Ethernet Card: The Scientific name Ethernet Adapter, the transmission protocol for the IP protocol, generally via fiber optic cable or twisted pair with Ethernet switch connection. The interface types are divided into optical and electrical ports. Optical ports ar
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