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相关协议1) 802.1Q Virtual Bridged Local Area Networks2) 802.1ad Provider Bridges A Bridge can be logically subdivided into the following components:• S-VLAN component• C-VLAN componentBridge

Network troubleshooting and performance monitoring solutions including VoIP and packet analysis.

Differentiated services or DiffServ is a computer networking architecture that specifies a mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks. DiffServ can, for example, be used to provide low-latency to critical network traffic such as voice or streaming media while providing best-effort service to non-critical services such as web traffic or file transfers.

RFC 2638 from the IETF defines the entity of the Bandwidth Broker (BB) in the framework of differentiated services (DiffServ). According to RFC 2638, a Bandwidth Broker is an agent that has some knowledge of an organization's priorities and policies and allocates quality of service (QoS) resources with respect to those policies. In order to achieve an end-to-end allocation of resources across separate domains, the Bandwidth Broker managing a domain will have to communicate with its adjacent peers, which allows end-to-end services to be constructed out of purely bilateral agreements. Admission control is one of the main tasks that a Bandwidth Broker has to perform, in order to decide whether an incoming resource reservation request will be accepted or not. Most Bandwidth Brokers use simple admission control modules, although there are also proposals for more sophisticated admission control according to several metrics such as acceptance rate, network utilization, etc. The BB acts as a Policy Decision Point (PDP) in deciding whether to allow or reject a flow, whilst the edge routers acts as Policy Enforcement Points (PEPs) to police traffic (allowing and marking packets, or simply dropping them).

In my Digital Identity book, I mention that even though most people hate digital rights management (DRM) schemes on digital goods like software and music, that's exactly what we'd all like for our identity information. For example, I'd love...

My hobby for a while has been to collect "X-headers". X-headers are fields in the request HTTP header beginning with an X. Put simply. These fields are kind of non-standard or proprietary add-ons to the regular fields in the HTTP

3G data rates. The UMTS World is an 3G mobile system news and information provider. Comprehensive coverage of UMTS / 3G news, licensing, business developments, 3G WCDMA telecommunication technology, multi media mobile phones and future communications.

X.25 is an ITU-T standard protocol suite for packet-switched data communication in wide area networks (WAN). It was originally defined by the International Telegraph and Telephone Consultative Committee in a series of drafts and finalized in a publication known as The Orange Book in 1976.

Radius is the authentication and accounting server used in Rel 7. I have been reading a lot about it as my job demands to create a test plan...

How a brainless, single-celled organism created a startlingly efficient route map for U.S. highways

A Name Authority Pointer (NAPTR) is a type of resource record in the Domain Name System of the Internet.[1][2]

web application security blog

Varnish is an HTTP accelerator designed for content-heavy dynamic web sites as well as APIs. In contrast to other web accelerators, such as Squid, which began life as a client-side cache, or Apache and nginx, which are primarily origin servers, Varnish was designed as an HTTP accelerator. Varnish is focused exclusively on HTTP, unlike other proxy servers that often support FTP, SMTP and other network protocols.

Encryption tools exist to protect your privacy… and also to make you feel like you’re an awesome spy. Today we’ll use a portable USB drive to hold all of your passwords encrypted in a virtual disk hidden inside a file.

Approximately 375 million people speak English as their first language, in fact it's the 3rd most commonly spoken language in the world (after Mandarin Chinese and Spanish) but interestingly enough it's the number 1 second language used worldwide - which is why the total number of people who speak English outnumber those of any other language.

Now here's something to raise a few eyebrows, MegFon the 2nd biggest mobile phone company in Russia, have just released a series of ads promoting mobile phone usage to the general public. We can only assume though, that the fine ladies of Russia don't use mobile phones, because these ads certainly weren't targeted to them.

Invariably trenchant and always worth reading, Ivan Pepelnjak today explores what he believes Google is doing with OpenFlow. As it turns out, Pepelnjak posits that Google is doing more with other t…

Google unveiled some details of its new internal network at Open Networking Summit in April and predictably the industry press and OpenFlow pundits exploded with the “this is the end of the networking as we know it” glee. Unfortunately I haven’t seen a single serious technical analysis of what it is they’re actually doing and how different their new network is from what we have today.

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