PAE Networks Ltd © 2009 All rights reserved
Site by PAE Websites & PAE Hosting
Call our Support Desk on 0844 257 2422
Do you need help linking your sites?
For efficient solutions get in touch today...
Glossary of Terms -
With special thanks to all of our contributors.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
NAT (Network Address Translation)
Network Address Translation allows private IP addressing schemes (i.e. those within an organisation) to communicate with public addressing schemes (such as the Internet) and the packets to be routed between.
As there is obviously a finite number of IP addresses on the Internet, an organisation may only be allocated a small number of IP addresses for the outside world to see (possibly given to a router or firewall). Therefore, all its internal IP addresses can be numbered as the organisation wants, but must be translated by the router or firewall. Before they leave the organisation’s network
Network administrators create a NAT table that does the global-
Cisco IOS NetFlow efficiently provides a key set of services for IP applications,
including network traffic accounting, usage-
NetFlow version 9, the latest Cisco IOS NetFlow innovation, is a flexible and extensible
method to record network performance data. It is the basis of a new IETF standard.
Cisco is currently working with a number of partners to provide customers with comprehensive
solutions for NetFlow-
By using Cisco Netflow, administrators would gain a better understanding of what traffic is flowing through their network. Depending on the traffic flows and application priorities, the network could be adapted to suit the business requirements and may link into other Cisco IOS features.
Netiquette is the unofficial etiquette for online behaviour. A good example of bad
netiquette is when you communicate online using ALL CAPITAL LETTERS -
A WWW Browser and the name of a company. The Netscape (tm) browser was originally based on the Mosaic program developed at the National Centre for Supercomputing Applications (NCSA).
A network is any active link between two or more computers that allows them to communicate with each other. Computers can be linked on a network in many ways; wired, wireless, satellite, infra red, cable and more.
Network Access Control (NAC) is an approach to computer network security that attempts
to unify endpoint security technology (such as anti-
Network Access Control (Cisco NAC)
Many organisations wish to enforce network security policies on all devices seeking
network access. Cisco Network Admission Control (NAC) allows only compliant and trusted
endpoint devices, such as PCs, servers, and PDAs, onto the network, restricting the
access of noncompliant devices, and thereby limiting the potential damage from emerging
security threats and risks. Cisco NAC gives organizations a powerful, roles-
- Security policy compliance: Ensures that endpoints conform to security policy; protects infrastructure and employee productivity; secures managed and unmanaged assets; supports internal environments and guest access; tailors policies to your risk level
- Protects existing investments: Is compatible with third-
party management applications; flexible deployment options minimize need for infrastructure upgrades - Mitigates risks from viruses, worms, and unauthorized access: Controls and reduces
large-
scale infrastructure disruptions; reduces OpEx and helps enable higher IT efficiency; integrates with other Cisco Self- Defending Network components to deliver comprehensive security protection
Cisco NAC Appliance (formerly Cisco Clean Access) is an easily deployed Network Admission Control (NAC) product that uses the network infrastructure to enforce security policy compliance on all devices seeking to access network computing resources. With NAC Appliance, network administrators can authenticate, authorize, evaluate, and remediate wired, wireless, and remote users and their machines prior to network access. It identifies whether networked devices such as laptops, IP phones, or game consoles are compliant with your network's security policies and repairs any vulnerability before permitting access to the network.
The Cisco NAC Appliance can be configured in a number of ways. While the Cisco NAC
Appliance in in-
Network Configuration/Compliance Management (NCM)
...
Network management refers to the activities, methods, procedures, and tools that pertain to the operation, administration, maintenance, and provisioning of networked systems.
- Operation deals with keeping the network (and the services that the network provides) up and running smoothly. It includes monitoring the network to spot problems as soon as possible, ideally before users are affected.
- Administration deals with keeping track of resources in the network and how they are assigned. It includes all the "housekeeping" that is necessary to keep the network under control.
- Maintenance is concerned with performing repairs and upgrades -
for example, when equipment must be replaced, when a router needs a patch for an operating system image, when a new switch is added to a network. Maintenance also involves corrective and preventive measures to make the managed network run "better", such as adjusting device configuration parameters.
- Provisioning is concerned with configuring resources in the network to support a given service. For example, this might include setting up the network so that a new customer can receive voice service.
A common way of characterizing network management functions is FCAPS -
Functions that are performed as part of network management accordingly include controlling, planning, allocating, deploying, coordinating, and monitoring the resources of a network, network planning, frequency allocation, predetermined traffic routing to support load balancing, cryptographic key distribution authorization, configuration management, fault management, security management, performance management, bandwidth management, Route analytics and accounting management.
Data for network management is collected through several mechanisms, including agents
installed on infrastructure, synthetic monitoring that simulates transactions, logs
of activity, sniffers and real user monitoring. In the past network management mainly
consisted of monitoring whether devices were up or down; today performance management
has become a crucial part of the IT team's role which brings about a host of challenges
-
Network security has become a major element in the design of any infrastructure. Whilst all networks need security to guarantee the integrity of data, different types of organisations need different levels of security. For example a bank will invest much more in network security than a retailer.
There are some common and “of the moment” issues that most IT professionals should be aware of when discussing networking. Most of these concern the vulnerability of data when using certain technologies to transmit information, and include subjects such as Wireless networking, shared WAN infrastructures (Internet VPN, DSL etc). Although most of these issues can be addressed with the use of a number of security technologies, it is important to define a complete company wide security strategy.
Network Resilience is a subjective element of network design and implementation, and is the idea that certain applications, users or branches are more important than others; and that they deserve additional spending to ensure that they are made available a higher percentage of the time.
In real terms, this may involve installing a backup circuit into a branch on a Wide Area Network in case the main circuit fails. If this connectivity is deemed very important, it is possible to diversely route backup circuits to guard against PoP or Local Exchange failure.
Other examples include UPS’s, Generators, dual power supplies, dual interfaces, dual modules, mirrored servers, data backup etc. Today’s increasing reliance on electronic data and networks has prompted many organisations to have dedicated DR (Disaster Recovery) strategies in place.
NIC (Network Information Center)
Generally, any office that handles information for a network. The most famous of these on the Internet was the InterNIC, which was where most new domain names were registered until that process was decentralized to a number of private companies.
Also means "Network Interface card", which is the card in a computer that you plug a network cable into.
NNTP (Network News Transport Protocol)
The protocol used by client and server software to carry USENET postings back and forth over a TCP/IP network. If you are using any of the more common software such as Netscape, Nuntius, Internet Explorer, etc. to participate in newsgroups then you are benefiting from an NNTP connection.
Any single computer/device connected to a network.
Nortel Networks Corporation, formerly known as Northern Telecom Limited and sometimes known simply as Nortel, is a multinational telecommunications equipment manufacturer headquartered in Toronto, Ontario, Canada.
Novell, Inc. is a global software corporation based in the United States specializing
in enterprise operating systems such as SUSE Linux Enterprise and Novell NetWare;
identity, security and systems management solutions; and collaboration solutions.
Together with WordPerfect, Novell was instrumental in making the Utah Valley a focus
for high-
Can’t find what you need?
Email us and we’ll let you know...fast!