NETWORKING DEVICES
10. GATEWAYS
11. ISDN ADAPTER
12. FIREWALLS
13. MODEMS
14. WIRELESS ACCESS POINT (WAP)
15. PROXY
11. ISDN ADAPTER
12. FIREWALLS
13. MODEMS
14. WIRELESS ACCESS POINT (WAP)
15. PROXY
10.
GATEWAYS :- A gateway is a device used to connect networks using different
protocols.
- In order to communicate with a host on another network, an IP host must be configured with a route to the destination network. If a configuration route is not found, the host uses the gateway (default IP router) to transmit the traffic to the destination host.
- If no default gateway is specified, communication is limited to the local network.
- e.g E-mail gateways-for example, a gateway that receives Simple Mail Transfer Protocol (SMTP) e-mail, translates it into a standard X.400 format, and forwards it to its destination.
11. ISDN ADAPTER :- ISDN stands for Integrated Services Digital Network.
- ISDN Adapter can be used to send the voice, data, or video over standard telephone cabling.
- ISDN adapters must be connected directly to a digital telephone network
- ISDN adapters are not actually modems, since they neither modulate nor demodulate the digital ISDN signal.
- ISDN hardware requires a NT (network termination) device, which converts network data signals into the signalling protocols used by ISDN.
fig. ISDN device with ADAPTER
12. FIREWALLS :- Firewall is a piece of hardware and/or software which is used for security purpose.
- In order to restrict unauthorized access, from outside environment to inside network.
- Firewall has the basic task to control the traffic between different zones of trust.
fig. Types of Firewall
fig. Firewall
13. MODEMS :- Modem stands for Modulator/Demodulator.
- MODEM convert digital signal generated by computer into analog signals that can travel over conventional telephone line.
- Connect to ISP.
- Dialling up to a LAN.
- Internal add-in expansion cards or external cards or external devices connect to serial or USB port.PCMCIA cards for Laptops.
- Speed of the universal Asynchronous Reciever/Transmitter (UART) chip.
- Types of MODEMS :- * DSL * ADSL * RADSL * HDSL * SDSL * VDSL
fig. MODEM
14. WIRELESS ACCESS POINT (WAP) :- Devices that provide connectivity between wireless LAN devices and in most cases a wired network.
- Antennae
- convert signal from radio wave or other to that used on the LANs
fig. Wireless Access Point
15. PROXY :- Proxy server is kind of buffer in between our computer and internet resources we are accessing.
- It is used to access the prohibited or filtered sites by your ISP or institution.
- It is used to keep the machine anonymous, mainly for security.
- It is used to prevent the downloading the same content again and again.
- It is used to scan the outbound content (for data loss prevention).
- To check the latest working proxy of the day then check it on site www.samair.ru .
Made By P & V
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