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2025-04-05 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
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Shulou(Shulou.com)06/01 Report--
one。 DCN Data Communication Network data communication network
Transmit all kinds of management information of provincial network management centers to DGT.
two。 GSM Global System for Mobile communications Global system for Mobile Communications
At present, the most widely used mobile phone standard is being used in more than 200 countries and regions around the world. It is because of its widespread use that it is possible to roam in different parts of the world. This is also the origin of the name "GSM", an important business brand of Mobile.
Compared with analog communication technology, GSM is the second generation (2G) communication technology, which adopts time division multiple access (TDMA) technology and the transmission rate is 9.6Kbps.
Frequency band:
900MHZ
The effective bandwidth is 25MHZ (why), 124 carrier frequencies (what), and each carrier frequency has 8 channels.
1800MHZ
The effective bandwidth is 75MHz and 374 carrier frequencies, each with 8 channels.
three。 GPRS General Packet Radio Service General packet Radio Service
A mobile data service available to GSM mobile phone users, a network supporting high-speed packet data is added to the GSM network, and the transmission rate can be increased to 56 or even 114Kbps. GPRS is a technology between 2G and 3G, also known as 2.5G.
four。 CMNET & CMWAP
five。 Multiple access mode
six。 Shannon's theorem
SCG
EMOS
WVS scanner
Nessus scanner
Whether DNS is open DNS
Tamper-proof system for Web pages: principle and composition
URPF:Unicast Reverse Path Forwarding
Flow reinjection technology
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