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A Glossary of Networking Terms – Part 1

Nearly every part of our lives these days will be affected, influenced and often facilitated by the use of computers and more to the point, networks of computers. Whether it be the wireless networks of PCs, games consoles and phones sharing internet connections in our homes or the vast business infrastructures that provide so many of the services we take for granted; even the internet itself. As with all areas of technology though, the world of networking is thick with jargon and so can appear very esoteric to those that don’t work within the field. This article therefore aims to summarise a few of the terms that people might stumble across in their everyday encounters with networks.PacketsData packets, sometimes simple referred to as packets in a computing context, are to some extent self explanatory in that they are pieces/units of digital data which are formatted into ‘packets’ in order for them to be transferred across networks. There are two elements to these packets, the information that is being transferred (sometimes called the payload) and the control data, which contains information to help it reach its destination. The control data can include details about the destination and source addresses, error checking, information about the size and type of packet (which protocols it follows) and information to help reconstruct bigger units of data where they fragmented into smaller packets. A helpful analogy is that of a letter which can contain all of the information it needs to reach its destination and be interpreted by the reader correctly, recorded before and after the content itself.LAN vs WANLAN is the abbreviation of Local Area Network; WAN is the abbreviation of Wide Area Network. LANs and WANs are to some extent defined in contrast to each other.In simple terms LANs are small networks which connect devices in one location. They are usually constructed using Ethernet cables (and their compatible technologies) and/or Wireless protocols to connect the localised devices, all behind one firewall. As a result of the proximity of devices and therefore the technologies that can be used to connect them, LANs are able to offer high speed data transfer rates between the interconnected devices. They are commonly deployed and utilised in single work locations such as offices but over the last decade or so have also become common in peoples homes to enable their computers and entertainment devices to talk to each other and share an internet connection. They are, by their nature, private networks (with communication possible between local devices behind a firewall) and usually have a single gateway to public networks such as the internet.WANs, on the other hand, are networks which span multiple locations to interconnect individual devices or separate local networks. The term can therefore be applied to the entire network they form (including LANs) or the just the connections made between the separate localised networks. WANs can employ a variety of technologies to this effect. They can take the form of private networks where dedicated leased lines or virtual private networks are used to securely connect disparate private LANs together, or they can simply form open communication networks which the public can use to share information. In the latter sense the internet can be considered to be a variation of a WAN. Private WANs are integral fro businesses working across multiple locations to ensure that each location can interact and communicate securely and to offer the economies of scale that arise from the centralisation of infrastructure such as the use of central servers for business hosting.

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Policy And Guidelines For Securing Your Remote Access

If you are a network or IT administrator of a company and you provide remote access to your internal infrastructure, then you must consider this as one of your biggest security threats and give extreme consideration on how to protect your network. Remote Access is sometimes mandatory and can be used for a variety of reasons. Maybe you are outsourcing some of your business to an external partner, maybe you require external technical support, or you may have employees on the road or tele-workers that require access to internal data and resources in your company. In any case, you must take measures to protect your data and network, but still keep the operation of your remote access service as functional as possible. Some of the most important guidelines to follow in order to protect your remote access service are the following:
Communicate with everyone that the remote access service shall be treated with the same consideration as the on-site connection.

Try to use IPSEC-VPN for your remote access method, using the highest encryption AES.

Install an Authentication Server (RADIUS server) in order to better manage the password credentials of the remote access users.

Enforce a strong password policy for remote access, with at least 10 characters including alphanumeric and special characters.

Try to use OTP (One Time Passwords) where possible.

Terminate all remote access to a centralized infrastructure (Firewall, VPN concentrator, router with IPSEC etc) in order to have better control and monitoring.

Limit the access of the remote users to only what is required. For example limit the access to only the internal mail server and prohibit access to other internal resources.

For employees that take their laptop to work from home, the employee is responsible to prohibit other family members from using the remote access connection or even the business laptop for any reason.

Disable ‘Split Tunnelling’ on the VPN access. Split Tunnelling is when the remote user can freely browse the internet while connected to the corporate office. The threat with this is that if you catch a virus while browsing, this can spread out to the corporate network through the remote access tunnel.

The laptop used for remote access must have antivirus and antispyware with the latest updates installed.

Limit the remote access hours to only what is necessary. Do not have remote access enabled 24 hours.

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