Fundamentals of Network Communication Quiz Answer

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Fundamentals of Network Communication

Offered By ”The State University of New York”

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Instructor: Xiaobo Zhou

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Week- 1

Practice Assessment – Communication Networks and Services

1. Which of the following networks use store-and-forward switching operation?

Telegraph networks
Wireless Networks

Computer networks
Telephone networks

2. There are similarities between message switching and packet switching. Which of following that applies to packet switching but not to message switching?

Variable length of information block
Supporting multiple applications

Store-and-forward
All of the above

3. Which of the following networks can be connection-oriented?

Telegraph networks
Computer networks

Telephone networks
All of the above

4. A protocol is a set of precise and unambiguous rules that governs

How two or more communicating entities in a layer are to interact
Messages that can be sent and received

Actions that are to be taken when a certain event occurs
All of the above

5. DNS is a domain-name-service that responds to queries of domain name to IP address or IP address to domain name. DNS uses services provided by

TCP
UDP

HTTP
None of the above

6. A network used to join the individual networks at different sites into one extended network is called

SAN
VPN

7. Upon receipt of a bad segment, UDP?

It does error control
Retransmission

It does flow control
It does not do flow and error control

Graded Assessment – Communication Networks and Services

1. Which of following protocol is HTTP built upon?

IP
SMTP

TCP
UDP

2. Which of following requirements are necessary for packet networks to support multiple and diverse applications?

Transfer arbitrary message size
Low delay for interactive applications

Packets have maximum length
All of the above

3. What was the concern of the telephone system that motivated the ARPANET design?

Scalability
Vulnerability

Efficiency
None of the above

4. Which of the following is an application layer protocol?

DNS
HTTP

5. Which of the following are features of ARPANET design?

Connectionless packet transmission
Routing tables at the packet switches

Destinations identified by unique addresses
All of the above

6. Bluetooth is an example of

Wide Area Network
Local Area Network

Metropolitan Area Network
Personal Area Network

7. In the layer hierarchy as the data packet moves from the upper to the lower layers, headers are

Modified
Removed

Rearranged
Added

8. The ________ is the physical path over which a message travels

Medium
Path

Route
Protocol

9. Three or more devices share a link in ________ connection

Unipoint
Multipoint

Point to Point
None of the above

10. Which of the following is true for Transport Control Protocol

Connection oriented
Process to Process

Transport layer protocol
Connectionless

Week- 2

Practice Assessment – Layered Architecture

1. Which OSI layer is responsible for providing end-to-end communication with reliable service?

Network layer

Transport layer
Session layer
Data link layer

2. Which OSI layer is responsible for dividing the transmitted bit stream into frames?

Application layer

Transport layer
Network layer
Data link layer

3. Which OSI layer is responsible for determining which route through the network to use?

Network layer

Data link layer
Transport layer
None of the above

4. Which feature does the data link layer and transport layer have in common?

All of the above

Medium access control
Congestion control
Flow control

5. Which protocol glues the network of networks together as the Internet?

UDP
IP
None of the above

Graded Assessment – Layered Architecture

1. In a LAN, which address is used to transfer frames to appropriate destination?

IP address

Physical address
Domain name
None of the above

2. Suppose an application layer entity wants to send an L-byte message to its peer process, using an existing TCP connection. The TCP segment consists of the message plus 20 bytes of header. The segment is encapsulated into an IP packet that has an additional 20 bytes of header. The IP packet in turn goes inside an Ethernet frame that has 18 bytes of header and trailer. What is the bandwidth utilization in terms of the percentage of the transmitted bits in the physical layer corresponds to message information if L = 500 bytes?

70%
90%
80%
100%

3. Of the following services, which service(s) does the IP layer provides?

Error control
Flow control
Connection-based data transfer
None of the above

4. Which of the following is true about the ways in which the OSI reference model and TCP/IP reference model differ.

TCP/IP model does not have presentation layer, but OSI model has
TCP/IP model does not have session layer, but OSI model has
All of the above
They differ in the number of layers

5. Which of following statements is true about how the data link layer and transport layer differ?

Data link layer is concerned with framing and the transport layer is not
Data link layer is concerned with flow control and the transport layer is not
Data link layer is concerned with multiplexing and the transport layer is not
All of the above

6. This layer is an addition to OSI model

Application layer
Presentation layer
Session layer
Presentation layer and Session layer

7. The functionalities of presentation layer includes

Data compression
Data encryption
Data decryption
All of the above

Week- 3

Practice Assessment – Socket API & Digital Transmissions

1. Which of the following applications would you select TCP protocol for?

File transfer
Web browsing
Domain name service
None of the above

2. In BSD socket API, which type of socket is used to create a TCP socket?

SOCK_STREAM
SOCK_RAW
SOCK_DGRAM
None of the above

3. In BSD socket API, which type of socket is used to create a UDP socket?

SOCK_STREAM
SOCK_DGRAM
SOCK_RAW
None of the above

4. In BSD socket API, which system call is used to assign a network address to the socket?

listen()
connect()
None of the above
bind()

5. In BSD socket API, if a client knows the server name but not server’s network address, what system call should the client use to get server’s network address?

Connect()
gethostbyname()
gettimeofday()
None of the above

6. In a transmission system, which of the following statement is true for a receiver

Receives energy from medium
Converts information into signal suitable for transmission
Converts received signal into a form suitable for delivery to user
All of the above

7. In digital transmission, long distance digital communications require the use of a generator to recover original data sequence and re-transmits on next segment

True
False

8. In twisted pair, a category 5 UTP cable can support a data rate of up to 16MHz

True
False

9. Which of the following statement is true for optical fiber

Plentiful bandwidth for new services
Dominates long distance transmission
Distance less of a cost factor in communications
All of the above

10. Which of the following are advantages of optical fiber

No corrosion
Extremely low bandwidth
Wavelength dependency
Noise immunity

Graded Assessment – Socket API & Digital Transmissions

1. In BSD socket API, which call is usually used for transmitting data in the connectionless mode?

accept()
connect()
sendto()
None of the above

2. Which of following statement about TCP/UDP sockets is wrong?

TCP socket is stream oriented
UDP socket is block oriented
TCP is faster than UDP
All of the above

3. Which of following are commonly used as digital communication medium?

Optical fiber
All of the above
Coaxial cable
Twisted pair

4. Consider a network link that has distance of 100 meters, and signal traverses at the speed of light in cable 2.5 x 10^8 meters per second. The link has transmission bandwidth of 100 megabits/second (100 x 10^6 bits per second). The packet size is 400 bits. What is the signal propagation delay?

4 x 10^-7 seconds
4 x 10^-9 seconds
4 x 10^-6 seconds
None of the above

5. Consider a network link that has distance of 100 meters, and signal traverses at the speed of light in cable 2.5 x 10^8 meters per second. The link has transmission bandwidth of 100 megabits/second (100 x 10^6 bits per second). The packet size is 400 bits. What is the packet transmission delay?

None of the above
4 x 10^-9 seconds
4 x 10^-6 seconds
4 x 10^-7 seconds

6. An API allows application programs to access certain resources through a predefined interface?

True
False

7. In transport protocol, which of the following statements is true for User Datagram Protocol

It enables best-effort connectionless transfer of individual block of information
It enables connection-oriented reliable transfer of individual block of information
It enables best-effort connectionless reliable transfer of a stream of bytes
None of the above

8. Which of the following sentences are true for connectionless stream mode of service

No setup overhead and delay
Destination address with each block
Send/receive to/from multiple peer processes
Multiple write/read between peer processes

9. In transmission delay, in order to reduce the number of bits in a message we use data compression

True
False

10. Which of the following is true of data compression algorithms

Represent the information using fewer bits
Recover information approximately
Modify data headers
Recover original information exactly

Week- 4

Practice Assessment – Error Control

1. Given a 7-bit information frame (0, 1, 0, 1, 1, 0, 1), what is the even parity bit?

1
0
None of the above

2. Which of following statements are true for single-bit parity error detection?

It can detect all single bit errors in an information frame
It can detect all double bit errors in an information frame
It can detect all tripe bit errors in an information frame
None of the above

3. Which of following statements are true for two-dimensional parity error detection?

It can detect all single bit errors in an information frame
It can correct all single bit errors in an information frame
It can detect all double bit errors in an information frame
All of the above

4. Assume bit errors occur at random. If each bit has 50% probability to be in error by transmission. What is the probability of a four-bit frame to be in error by transmission?

1/4
1/8
1/16
None of the above

5. What is the binary sequence that corresponds to polynomial code X^3 + x^2 + 1?

0111
1101
111
1110

6. Block codes are generated using _____.

Generator matrix
Generator polynomial
Both of the mentioned
None of the mentioned

7. Which of the following is true for two-dimensional parity check

Arrange information in columns
Arrange information in rows
More parity bit to improve coverage
Add multiple parity bits to each column

8. Polynomial codes are implemented using shift register circuits

True
False

9. What is the binary equivalent of the following polynomial arithmetic

x7 + x6 + x5 + x2 + 1

11100111
11011101
11101101
11100101

10. Using Euclidean Division, what will be the remainder of 70 by 999 where 70 is the divisor and 999 is the dividend

Graded Assessment – Error Control

1. Given an information polynomial code I(x) = X^7 + x^6 + x^1 + 1, which is its corresponding per-bit information frame?

11000011
01100011
None of the above
10100010

2. What is the remainder obtained by dividing x^7 + x^5 + 1 by the generator polynomial x^3 + 1?

x^2 + x + 1
x^2 + x
x^2 + 1
None of the above

3. Given a generator polynomial g(x) = x^3 + x + 1. Consider the information sequence 1001. By CRC method, what is the resulted codeword for transmission?