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Computer Networks MCQ - SET 07
1. Key difference
between User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) is
(a) TCP is
connection-oriented, while UDP is connection-less
(b) UDP is a
reliable byte stream protocol, while TCP is not
(c) UDP uses
sequence numbers, while TCP does not
(d) UDP enforces
flow control, while TCP has no flow control
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Ans : (a)
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Answer: (a)
TCP is connection-oriented, while UDP is connection-less
The Transmission Control Protocol
(TCP) helps to: ensure the recipient receives all of the data that’s sent
(via a delivery receipt), and keep the data transmissions organized by
ensuring that packets are received by the recipient in their intended order.
Hence, TCP is a connection-oriented communication protocol.
On the other hand, User Datagram
Protocol (UDP) requires no connection to be established prior to sending your
data packets (or, more specifically, datagrams).
[Please refer here for more on TCP
and UDP]
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2. How IPv6 is
different from IPv4?
(a) Quality of
Service is better in IPv4
(b) Expanded IP
address space for IPv6
(c) IPv4 is better
than IPv6 in terms of support for mobility
(d) None of the
above
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Ans : (b)
|
Answer:
(b) Expanded IP address space for IPv6
Internet Protocol version 6 (IPv6): IPv4
is based on 32-bit addressing, limiting it to a total of 4.3 billion
addresses. IPv6 is based on 128-bit addressing and can support 340
undecillion, which is 340 trillion addresses. Having more addresses has grown
in importance with the expansion of smart devices and connectivity. IPv6
provides more than enough globally unique IP addresses for every networked
device currently on the planet, helping ensure providers can keep pace with
the expected proliferation of IP-based devices. [Please refer here for more
on IPv6]
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3. Transmission
Control Protocol (TCP) supports _____ data transfers?
(a) Full-duplex
(b) Half-duplex
(c) Simplex
(d) None of the
above
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Ans : (a)
|
Answer: (a)
Full-duplex
TCP is a transport-layer protocol
that provides a reliable, full duplex, connection-oriented data transmission
service. It is full-duplex because it can send and receive the data from both
the side of connection simultaneously, without requiring line turnarounds, at
the API level.
"If
there is a TCP connection between Process A on one host and Process B on
another host, then application layer data can flow from Process A to Process
B at the same time as application layer data flows from Process B to Process
A".
Another explanation:
Full duplex or not is depend on the
type of the Ethernet connection.
If the switches and cabling support
full duplex the TCP connection will work on full duplex but if those only
support half duplex the TCP connection will work as half duplex.
The speed and duplex setting are not
features of TCP those are inherited and are part of a lower OSI layer, the
transport layer. [Please refer here for details]
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4. The field “Window”
or “Window size” in TCP header refers to
(a) sender window
(b) receiver window
(c) congestion
window
(d) none of the above
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Ans : (b)
|
Answer:
(b) receiver window
The Window size is considered to be
one of the most important flags within the TCP header. The size specifies the
amount of data the destination is willing to accept from the sender. The
sending host can send only that size of data before it must wait for an
acknowledgment and window update from the receiving host.
The window size flag consumes 16
bits. TCP supports flow control and the window size field is used for flow
control.
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5. The strength of
signal falls off with distance over any transmission medium is called
(a) Attenuation
(b) Data rate
(c) Channel
capacity
(d) Signal strength
ratio
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Ans : (a)
|
Answer: (a)
Attenuation
Attenuation is the loss of signal
strength that occurs in networking cables or connections during transmission
of signal from place to place. This happens when a signal loses energy
overcoming the resistance of the medium in which it is traveling.
Attenuation typically is measured in
decibels (dB) or voltage and can occur due to a variety of factors.
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Related links
Define the term attenuation in networking
TCP supports full-duplex communication
State the key difference between TCP and UDP
How IPv6 is different from IPv4
Multiple choice questions in computer networks
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