Worksheetsnwc203
Total questions: 41
Worksheet time: 21mins
Which of the following networks use store-and-forward switching operation?
Computer networks
Telegraph networks
Telephone networks
Wireless Networks
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
Which of the following networks can be connection-oriented?
Telegraph networks
Computer networks
Telephone networks
All of the above
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
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
A network used to join the individual networks at different sites into one extended network is called
PAN
LAN
SAN
VPN
Upon receipt of a bad segment, UDP?
It does flow control
It does not do flow and error control
It does error control
Retransmission
Which of following protocol is HTTP built upon?
IP
TCP
UDP
SMTP
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
What was the concern of the telephone system that motivated the ARPANET design?
Scalability
Vulnerability
Efficiency
None of the above
Which of the following is an application layer protocol?
HTTP
UDP
DNS
TCP
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
Bluetooth is an example of
Local Area Network
Wide Area Network
Metropolitan Area Network
Personal Area Network
In the layer hierarchy as the data packet moves from the upper to the lower layers, headers are
Removed
Modified
Added
Rearranged
The ________ is the physical path over which a message travels
Protocol
Route
Medium
Path
Three or more devices share a link in ________ connection
Unipoint
Multipoint
Point to Point
None of the above
Which of the following is true for Transport Control Protocol
Connection oriented
Process to Process
Transport layer protocol
Connectionless
Which OSI layer is responsible for providing end-to-end communication with reliable service?
Transport layer
Network layer
Session layer
Data link layer
Which OSI layer is responsible for dividing the transmitted bit stream into frames?
Network layer
Transport layer
Application layer
Data link layer
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
Which feature does the data link layer and transport layer have in common?
Medium access control
All of the above
Congestion control
Flow control
Which protocol glues the network of networks together as the Internet?
TCP
UDP
IP
None of the above
In a LAN, which address is used to transfer frames to appropriate destination?
IP address
Physical address
Domain name
None of the above
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?
100%
70%
90%
80%
Of the following services, which service(s) does the IP layer provides?
Error control
Flow control
Connection-based data transfer
None of the above
Which of the following is true about the ways in which the OSI reference model and TCP/IP reference model differ
They differ in the number of layers
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
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
This layer is an addition to OSI model
Application layer
Presentation layer
Session layer
Presentation layer and Session layer
The functionalities of presentation layer includes
Data compression
Data encryption
Data decryption
All of the above
Which of the following applications would you select TCP protocol for?
File transfer
Domain name service
Web browsing
None of the above
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
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
In BSD socket API, which system call is used to assign a network address to the socket?
listen()
None of the above
connect()
bind()
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()
None of the above
gettimeofday()
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 suitable for delivery to user
All of the above
In digital transmission, long distance digital communications require the use of a generator to recover original data sequence and re-transmits on next segment
t
f
In twisted pair, a category 5 UTP cable can support a data rate of up to 16MHz
t
f
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
Which of the following are advantages of optical fiber
Noise immunity
No corrosion
Extremely low bandwidth
Wavelength dependency
Given a 7-bit information frame (0, 1, 0, 1, 1, 0, 1), what is the even parity bit?
0
1
None of the above
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
