My Netwok Dictionary

If you are an IT expert, will often encounter a lot of computer users do not understand anything silly in the case of the system (such as a cup holder to drive bracket). However, in the maintenance of Cisco networks, we will make mistakes, is not it? In fact, we process in the maintenance of the network have also done a lot of stupid things, these errors can be avoided entirely. In order to help other network administrators avoid these costly mistakes, where management of Cisco routers are listed ten common mistakes, hope that we have to rectify.

1. No backup Cisco router configuration:

Although the article lists ten ways that there is no specific order, but if it is in order of importance, this section shall be in the first place. Imagine, your Cisco router crash, but overnight, the router will restore your boss will appreciate you how. However, if a network administrator, you can not configure the router to work as in the past, the boss will face what is it? In fact, the backup router configuration is very simple, just enter the following command: Read the rest of this entry »

In the past decade, various organizations have been keen to cut costs through simplified management, compliance and promote green IT objectives to enhance enterprise IT systems. This led to devices overwhelmed, and the original distribution of business-critical content and applications in various branches began to focus on at least end the number of core data center. At the same time, the mobile office and remote wireless endpoints gradually increased the number of users; distributed business model has been popular. This change led to a series of new generation of accelerated programs, including help users to maximize performance, and long-distance and cross the WAN to improve end-user access to critical business applications and Web experiences. Read the rest of this entry »

With the use of “defense in depth” approach, like all good security policies, wireless network security should be achieved at multiple levels. Enterprise-class wireless solutions, the most common security measures include authentication, encryption and access control.

1. The wireless authentication:

Traditional wired network using the “user name and password” for authentication has been for many years. CHAP, MSCHAP, MS-CHAPV2 and EAP-MD5 query is the infrastructure for wired and dial-up passwords frequently used query mechanism. The identity authentication is system based on a password hashing and authentication server for a random query. Although the password hash / query system in a cable infrastructure has been quite reliable, but is now shown to wirelessly deploy the same authentication mechanism is defective. Capture or listen through the radio frequency in the data packet authentication, hackers can use common tools for dictionary attack to find the password for the air transport, through the middle attacks to steal session information, or try to replay attacks. Read the rest of this entry »

Network security mechanisms have its own protocol standards, as our society has its own laws bound to ensure social stability. WLAN security standards on wireless networks is the main content of this paper to understand the wireless network WLAN security standards, we want to help.

Wireless Network WLAN security standards, there are basically three types, namely, WEP, WPA, and WAPI.

1. WEP:

WEP (Wired Equivalent Privacy) is the 802.11b security standards used for providing an encryption mechanism to protect the security of the data link layer, so that wireless data transmission network WLAN and wired LAN security to achieve the same level. WEP uses RC4 symmetric encryption algorithm. By pre-AP and the wireless card in the shared key in the communication, WEP standard transfer procedures to create a specific packet initialization vector (IV), the key is combined with pre-generated encryption for data packet encryption key. Receiving application to receive the initialization vector, and its combination with the local pre-shared key is to recover the encryption key. Read the rest of this entry »

Most of the current network around the Intranet / Internet system, or a single LAN, we focused on the popular computer network system of small Internet cafes, for example, is about the most common symptoms and troubleshooting.

1. The network will not work: This is the most common problem, the basic principle is to solve the problem after the first soft-hard, start with the software to consider for the popular Windows network, you can first install TCP / IP protocol, specify the IP address of each computer, use Ping command to see whether other computers Ping’s pass, if blocked, then the proof net Network connectivity problems, if the pass but sometimes if a packet is lost, proof of network transmission is blocked, or not good contact with the network device, you need to check the network devices. Read the rest of this entry »

Wireless router is used to network devices, how do we conduct a comprehensive understanding and use of it? The following article will give the details for the introduction of the wireless router.

In order to achieve the family share multiple computers share Internet surf the Internet access account, you need a broadband router device. Wireless Broadband Router allows multiple devices to wirelessly share a broadband Internet line. It is more than the average broadband router flexibility to avoid wiring, truly “plug and play.” You can now only need one device to connect to wireless networks and wired Ethernet to use Users to share high-speed broadband Internet connection. Read the rest of this entry »

Although a firewall to prevent network intrusion has a high efficiency, and has become to the Security Web site and services are key factors, but all these security are achieved at high cost. In short, the firewall will limit the performance and scalability. Since the firewall will create a single point of failure of the line equipment, so it will reduce the availability of the network. Firewall technology and emerging Web switching technology allows the combination of firewall performance, availability and scalability are greatly improved.

The most commonly used by the installed firewall software on a server form. This server has two network cards installed, and was inserted into the data path. A network card which connects to the network’s public side, the public Internet terminal is usually connected with the router (the so-called firewall “dirty” side). Another piece of card attached with the need to protect the resources (the so-called firewall “clean” side). Read the rest of this entry »

Abstract At present the next-generation softswitch core network (NGN) for their small investment, quick, flexible configuration being carriers and product providers of all ages. The use of IP softswitch technology and the establishment of the internet network, based on its own security to the system must establish a comprehensive security mechanism. In this paper, the definition of telecommunications needs of network information security, citing the safety of the popular attacks on the basis of that system should provide security services, and focuses on the establishment of security mechanisms involved and related technologies.

I. Introduction:

The next-generation softswitch core network (NGN) operators the advantages of making investments and accelerate the reduction on the network construction progress at the same time, enabling service providers and users benefit. However, the present, although many manufacturers launched the softswitch solution, operators are also actively carry out the construction, but because of the technology and applications will make things last ten years, in perfect agreement, the business still need to be carried out long time to carry out, especially the NGN bearer network to IP network as a voice network, how to solve the existing network security systems can become safe, stable operation of the key. Read the rest of this entry »

A new generation of network management tools can provide solutions to the last man, into complex network management automation, and have initiative and value-added features. It helps to improve the status of the network administrator, making policy administrator, network management while reducing the cost and complexity. 3Com network Management Company made ten recommendations, which can help and guidance of today’s network administrators benefit from the new network management products.

1. In advance identify potential problems before they occur - Network administrator’s should be found and corrected using the potential problems in advance of network management tools to take preventive measures. A new generation of system allows network administrators to set default values for the key equipment, once more than the default values, the system will automatically alarm, thus avoiding the user downtime. Some systems also automatically identify the network configuration error or optimize performance, and to inform the Webmaster obvious way. Read the rest of this entry »

In order to understand the data center virtualization security implications of the way, you need to know will be a purely physical infrastructure into a part or the entire infrastructure with virtualization, what changes will occur. By understanding these differences and used to compare the core principles of information security, which is able to find the focus of virtualization security.

The introduction of new management:

And, like all other infrastructure software, virtualization software, solutions also need the ability to manage the components. This is achieved through the management interface. Management interface to the host virtualization, management, server, IP-based storage and various ancillary services (such as authentication and monitoring) to connect together. Because the virtual machine and hypervisor interface is isolated from each other, so in the protection of virtual deployment process, the most important step is to any other network traffic management and design and implementation of a strict separation mechanism. This minimizes the attack by leaving the virtual machine virtualization layer, or any other virtual machines affected by the possibility. Read the rest of this entry »