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DSL Meant for Digital Subscriber Line. There are both type
of technologies are there. Symetric and asymetric also. For
HDSL, ADSL, RADSL etc. HDSL is Symmetric. ADSL is
Asymmetric.
asymmetric or symmetric
MODEM- MO-modulator & DEM-demodulator.
Modem is a device which convert the digital signal to
analog single and Analog signal to digital. The use of
modem in networking is to connect your computer to internet
using telephone line.Modem has RJ-11 connector.
There are two types of Modem Internal and external.
# 1 modem is modulator demodulator
modulator converts digital signals into analog signal so
that these signals can travel on to the telephone lines and
at the desitination the demodulator converts these analog
signal to digital signal.
There r two types of cables are there they are IDE and SATA
A firewall is a part of the computer or network which
prevents unauthorized access to it.Firewalls are frequently
used to prevent unauthorized Internet users from accessing
private networks connected to the Internet.It regulates
traffic of the network of different trust levels.
On the other hand,Access Control List refers to rules that
are applied to port numbers or network daemon names that are
available on a host, each with a list of hosts and/or
networks permitted to use the service. Both individual
servers as well as routers can have network ACLs.
This way. ACL are the rules to be implemented for security
while firewall is he complete setup or mechanism.
Firewall provides a permission or destroys for a packet to
enter inside our network from private network .
Acl's which provide rules to control which type of packet
to be destroyed or permitted
A hub can send or receive information, but it can’t do both at the same time. This makes hubs slower than switches. Hubs are the least complex and the least expensive of these devices.
Switches work the same way as hubs, but they can identify the intended destination of the information that they receive, so they send that information to only the computers that are supposed to receive it. Switches can send and receive information at the same time, so they can send information faster than hubs can.
simple..just take a look of the label if its a hub or a switch..
