CORRECT TEXT
Fill in the blank with the appropriate term. The ____________ is used for routing voice
conversations over the Internet. It is also known by other names such as IP Telephony,
Broadband Telephony, etc.

A.
ATA receives analog signals from the phone and then converts these signals to digital signals.
The digital signals are then received by the Internet Service Providers (ISP), and the system is
ready to make calls over VoIP.
Through IP Phone
IP Phones look exactly like the traditional phones, but they differ in that they have RJ-45 Ethernet
connectors, instead of RJ-11 phone connectors, for connecting to the computers.
Computer To Computer
This is the easiest way to use VoIP. For this, we need software, microphone, speakers, sound
card and an Internet connection through a cable or a DSL modem.
Soft Phones
Soft phone is a software application that can be loaded onto a computer and used anywhere in the
broadband connectivity area.
QUESTION 71
CORRECT TEXT
Fill in the blank with the appropriate term. The ___________protocol is a feature of packet-based
data transmission protocols. It is used to keep a record of the frame sequences sent and their
respective acknowledgements received by both the users.

Explanation:
The Voice over Internet Protocol (VoIP) is used for routing of voice conversation
over the Internet. The VoIP is also known by other names such as IP Telephony, Broadband
Telephony, etc. Analog signals are used in telephones in which the sound is received as electrical
pulsation, which is amplified and then carried to a small loudspeaker attached to the other phone,
and the call receiver can hear the sound. In VoIP, analog signals are changed into digital signals,
which are transmitted on the Internet. VoIP is used to make free phone calls using an Internet
connection, and this can be done by using any VoIP software available in the market. There are
various modes for making phone calls through the Internet. Some of the important modes are as
follows:
Through Analog Telephone Adapter (ATA)
In this mode, the traditional phone is attached to the computer through AT

The Sliding Window protocol is a feature of packet-based data transmission protocols. It is used in
the data link layer (OSI model) as well as in TCP (transport layer of the OSI model). It is used to
keep a record of the frame sequences sent, and their respective acknowledgements received, by
both the users. Its additional feature over a simpler protocol is that can allow multiple packets to
be “in transmission” simultaneously, rather than waiting for each packet to be acknowledged
before sending the next.In transmit flow control, sliding window is a variable-duration window that
allows a sender to transmit a specified number of data units before an acknowledgment is

received or before a specified event occurs.An example of a sliding window is one in which, after
the sender fails to receive an acknowledgment for the first transmitted frame, the sender “slides”
the window, i.e., resets the window, and sends a second frame. This process is repeated for the
specified number of times before the sender interrupts transmission. Sliding window is sometimes
called acknowledgment delay period.