Network security Articles
Network surveillance Cameras - ...network cameras available on the market to serve for your security wishes. Purchasing a network camera can reassure you that all aspects of your lif...
The Data centric World - ...p>
The support of the increasing data-centric nature of OLTP and data analysis application systems evolved through experiences in large database...
What is Network Monitor for - ...itoring is vital in modern IT infrastructure.
With a network monitor, the administrator can solve the uptime problem effortlessly. The network...
Ethernet specification - ...first years, Ethernet was proprietary to Xerox, a technology without a purpose, in a world in which the PC had not yet been invented.
In Sept...
Network Topologies - ... cables were ordinary wires, you might splice them together with the same abandon as making spaghetti, and the results might have a similar aestheti...
Network Hierarchies - ...l systems enforce a few differences in how the network is used.
Client-Server
Before PC networks, mainframe comput...
Handling too Many Network Logs - ...haywire. The trouble with logs is that there are always more than one of them, they are located in out-of-the-way locations on your server, and often ...
Saving Resources with Virtualization - ...e sure that you are using monitoring tools to keep track of what is going on before, during and after your migration. This way, you'll be able to prop...
What are a Networks Components - ...with a plug and a microprocessor to communicate with anything else.
When laptop computers arrived, they followed pretty much the same path. At...
Label Distribution Paths at a glance - ...ss Label Switch Router for that Label Switch Routers, whereas the last Label Switch Router of the Label Switch Routers is the egress Label Switch Rout...
What is the Asynchronous Transfer Mode - ... predominantly in the WAN network. Many vendors built Asynchronous Transfer Mode switches that could set up virtual circuits in the WAN network. The a...
Latest "Network security" Articles
Page# 1 (last added articles shown first)
Network security is one of the biggest threats we are facing (09/10/2010)
(...) In the improvement stage, the party doing the development may create corruption in the program that compromises the integrity of the software security. During distribution and installation problems might arise if strong efforts are not made to ensure that the software is tamper proof. Installing the program or transmitting it through non secured channels, also creates challenges for your software safety, that are effortlessly avoided if correct care and consideration are in place. (...)
Understanding how networks work (09/10/2010)
(...) This permits to get a better signal and longer length of cable. The cable will then go into an Ethernet port on the computer or server. Once this physical connection has been established the two computers can now talk back again and forth. (...)
Benefits of Multiprotocol Label Switching (09/01/2010)
(...) When a router forwards an IP packet, it doesn't change a value that pertains to the destination of the packet; that is, it doesn't change the destination IP address of the packet. The fact that the Multiprotocol Label Switching labels are utilized to forward the packets and no longer the destination IP address have led to the popularity of Multiprotocol Label Switching. These benefits like the better integration of IP over Asynchronous Transfer Mode and the popular Multiprotocol Label Switching virtual private network (Virtual Private Network) application. (...)
Label Distribution Paths at a glance (09/01/2010)
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This ingress Label Switch Router of the nested Label Switch Routers then pushes a second label onto the packet. The label stack of the packet on the second Label Switch Routers has two labels now. The top label belongs to the nested Label Switch Routers, and the bottom label belongs to the Label Switch Routers that spans the entire Multiprotocol Label Switching network. (...)
Overlay Virtual Private Network model (09/01/2010)
(...) The rerouting of traffic happens in under 50 ms, which is fast even for standardsof today.
History of Multiprotocol Label Switching in Cisco IOS
This section gives you a brief chronological overview of the Multiprotocol Label Switching implementation in Cisco IOS from its start in 1998.
Tag Switching to Multiprotocol Label Switching
Cisco Systems started off with putting labels along with IP packets in what was then called tag switching. (...)
Independent and Ordered Label Switch Routers Control mode (09/01/2010)
(...) If the Label Switch Router were running in Ordered Label Switch Routers Control mode, this Label Switch Router would only assign a local label binding for the IGP prefixes that are marked as connected in its routing table and also for the IGP prefixes for which it has already received a label binding from the nexthop router (as noted in the routing table). Cisco IOS uses Independent Label Switch Routers Control mode. Asynchronous Transfer Mode switches that are running Cisco IOS use Ordered Label Switch Routers Control mode by default. (...)
What is the Asynchronous Transfer Mode (09/01/2010)
(...) LANE specified how to carry Ethernet frames across the Asynchronous Transfer Mode cloud. MPOA provided a tight integration of IP over Asynchronous Transfer Mode, but it was a complex solution. None of these solutions was perfect in providing a better fit between IP and Asynchronous Transfer Mode. (...)
Overview of Cisco IOS Switching Methods (09/01/2010)
(...) In process switching, a special Cisco IOS process that is scheduled to run when the router receives packets is what performs the switching of packets.
A Cisco IOS process does not perform the switching of packets in Interrupt mode. Rather, when packets arrive to the router, the interface processor interrupts the central CPU and asks it to switch the packet according to a route cache or switching table. (...)
Load balancing importance in CEF (09/01/2010)
(...) The default CEF load balancing scheme is per-destination. This terminology is misleading, though, because the CEF per-destination load balancing is done by hashing the destination and source IP address. In contrast, the per-destination load balancing that fast switching does is strictly by exploring the destination IP address. (...)
A Label Switch Router never forwards IP addresses: Find out why (09/01/2010)
(...) Of course, you could program the Label Switch Router to perform deep packet inspection and always consider the IP header information of labeled packets to determine whether the Router Alert option were present. However, that can lead to a serious forwarding performance impact on the Label Switch Router, so it's not the best solution. It might not even be possible to get this done in hardware forwarding engines, or it may be too costly. (...)
What do you need for Multiprotocol Label Switching OAM (09/01/2010)
(...) It is possible for the control plane software to behave correctly, with the problem undetected by show commands on the router, while the data plane drops or mistreats the packet, which might result in a forwarding failure. For instance, an ASIC that performs the forwarding of labeled packets in hardware on the Label Switch Router might treat the TTL value wrongly. In that case, the packets might fail at this Label Switch Router or at an Label Switch Router that is further downstream. (...)
What are a Networks Components (08/20/2010)
(...) .. over a painfully slow dial- up connection where speeds were sometimes measured in minutes per page. (...)
Why Busy Interfaces and Notifications Are a Waste of Time in IT (08/06/2010)
(...) So having a bunch of bells and whistles constantly going off on a screen actually may not be as helpful in getting work done as one would think.
Using an application that is simple to configure and use is actually better than one that has menu upon menu of options and is complex to the eyes. One big problem with this is that IT professionals may not even notice the effect that these applications are having on them: often times network performance management systems can have so much information spewing forth there is really no way one can truly get a handle on what is going on. (...)
What are the Key Problems with HP OpenView Network Monitoring Software (08/06/2010)
(...) OpenView Focuses on Fault Management While performance management is the name of the game, it seems as though OpenView is stuck in fault management mode. There’s nothing wrong with that, but if HP is going to properly compete in the network performance management space, OpenView needs to be able to perform at a higher level than just letting administrators know when something goes down.
3. (...)
Is YouTube Affecting Your Networks Performance (08/06/2010)
(...) That would mean analyzing traffic via network performance monitoring to be able to see flow data and adjusting device configurations.
Of course, you need network performance management, or NPM, tools to do this. Not only would you be able to look at flow data through and NPM, you’ll be able to see specific users and there utilization on the network if you want to. (...)
Simplify Your View with Complex Network Architecture (07/13/2010)
(...) Sure, networks can be complex, but it’s your job to understand them.
Don’t make things more difficult than they have to be when you’ve got the right software for network management, it makes everything easier.
Does it seem that sometimes your network is so complicated that it is just too hard to manage? You’re not the only thinking about this. (...)
Handling too Many Network Logs (07/13/2010)
(...) Even better: depending on who owns a particular server in your organization, you can set filters so that only they get alerted when there is a problem, by using the associated IP address.
This is helpful in reducing redundant data sent to other engineers or analysts that don’t have the knowledge to fix the problem anyway. With all of this data coming into your syslog manager, some tools even allow you to break down information to make sure that you and other engineers aren’t spending time looking at repetitive log messages that are simply unimportant. (...)
Saving Resources with Virtualization (07/13/2010)
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This way, you are able to adjust accordingly to these environments. Perhaps you will be able to allocate more resources to one environment that another one is not using very efficiently. This is why networks are moving towards virtualization, so having the ability to peer into every environment from an easy-to-use tool is important. (...)
How Are You Managing Your Configuration Management (07/13/2010)
(...) Basic reporting is even available, giving you port, MAC and version information quickly.
The great thing about automating your configurations is that once you set your routers, switches and firewalls, you can forget about them until there is a problem. If something changes in the configuration, you can set the tools to make sure that it notifies you of such problems. (...)
Ethernet specification (06/21/2010)
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This specification is not what most people call Ethernet, however. In January 1985, the Institute of Electrical and Electronic Engineers published a networking system derived from Ethernet but not identical with it. The result was the IEEE 802. (...)
Network Topologies (06/21/2010)
(...) It must present a constant impedance to the signal, and every connection must be properly made. Any irregularity increases the chance of noise, interference, and error.
Designers have developed several topologies for PC networks. (...)
Network Hierarchies (06/21/2010)
(...) Transferring the structure to PCs was natural. At first, the computer managers merely connected PCs to the mainframe as smarter terminals. The connection schemes were called micro-to-mainframe links. (...)
Wireless Networks and Security Vulnerabilities (05/12/2010)
(...) The earliest protocol, Wire-Equivalent Protocol (WEP) was intended to fill the security gap. But the static nature of this protocol, coupled with rather weak encryption and authentication mechanisms, still leaves the wireless LAN vulnerable to a countless of security attacks. Improved protocols such as Wi-fi Protected Access (WPA) and its later versions attempt to overcome most of the shortcomings of WEP, but there are still certain security issues. (...)
WIRELESS NETWORKS SECURITY CONUTERMEASURES (05/12/2010)
(...) Operational counter-measures address issues related to physical security and covers such areas as access controls, personnel identification and external boundary protection. Finally, the paper discuses the technical countermeasures which address both hardware and software solutions.
Overview of Wireless Technologies
There is a wide range of wireless technologies, some of which are still emerging, and with varying levels of complexities and functionalities. (...)
Home broadband is an easy way to communicate (04/30/2010)
(...) The widely increasing culture of comparison shopping in the UK has entered into the home broadband market too. A number of comparison websites have come into existence to make this process easier. Users just need to enter their postcode and the website displays a comprehensive list of the service providers in that area. (...)
What is Network Monitor for (04/19/2010)
(...) These checks allow you to monitor a wide variety of network hosts and devices. The monitoring program should notify you when a device or server goes down automatically. Thanks to this fact, you can react to any problem quickly and recover all failures in time. (...)
Bypass VOIP and Internet Blocks with VPN (02/22/2010)
(...) Therefore, you can use the internet to access websites or programs such as Skype without having to go through a firewall. A VPN allows you to do anything you like no matter where you are in the world.
The main issue with VPNs that you need to consider is the whole initial connection issue. (...)
Advantages and Disadvantages of passive network analysis (10/24/2009)
(...) In contrast to the active scanning and agents, vulnerabilities may not be known until the next scan cycle.• Hidden hosts can be discovered that do not listen for active probing traffic on the network. Instead, these hosts only communicate by initiating conversation on the network, and can therefore only be detected passively. (...)
Advantages and Disadvantage of agent technology (10/24/2009)
(...) They may not have sufficient privileges in local security policy to audit every configuration item.They may have errors that cause them to terminate and notification of failure may not come to the management server for some time, during which an audit window could be missed.Agents may not be available for the OS maker and version in use. (...)
Advantages and Disadvantages of active scanning (10/24/2009)
(...) However, some basic planning will prevent such adverse effects.• Scanning is slower over slow network connections. This is typical in small offices with weak links. (...)
What is NAT (Network Address Translation) (09/30/2009)
(...) So, the solution for the scarce IP Address problem? - NAT.
NAT is a mechanism of taking a unique IP address and sharing it with a pool of devices. You may despair, "Thats like sharing my house address with someone else!", or perhaps, "Thats like sharing my phone number with someone else!", well, in a sense, it's something like that, but its not that bad. (...)
Characteristics that Affect Network Latency (08/24/2009)
(...) For dark fiber as well as lit circuits, that is not an option for a typical service provider, as they are quoting their circuits on an existing fiber path that in most cases cannot be varied. However, a network integrator that can utilize optimal spans from multiple providers will be able to piece together the most direct route, incorporating new fiber construction where required.
Reaching the end of the Fiber
In the longhaul environment, there are two main options for extending the transmission of light through the fiber; optical amplifiers and regenerators. (...)
3 Reasons Why Corporate Messenger Software is Safer than Free Messenger (11/19/2008)
(...) You can use it to gain complete administrative control over the chosen office communicator and be able to fully enforce your company’s rules.
Above all, secure messaging software is extremely flexible in terms of configuration for security and business rules which can be easily applied on the server application making the rules automatically applicable to all client applications within the network.
2. (...)
The Data centric World (11/08/2008)
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The effects of the high end OLTP and data-centric data warehouse applications accelerated the advancement of I/O architectures within high-end server systems and mainframes. These also spawned the development of increasingly complex distributed processing configurations to support the growth of I/O operations driven by business requirements that called for increasing amounts of data to be available online. These advancements have taken the form of Symmetric Multiprocessing Systems (SMP) and Massive Parallel Processing (MPP) systems. (...)
Network surveillance Cameras (07/09/2008)
(...) Also if funds are limited and your company can’t afford to employ security personal it makes economical sense to set up a few cameras in strategic positions and they can all be monitored at the same time. Network cameras have a number of uses and benefits. It is perfect for small companies offering protection 24/7. (...)
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