Protocols are
Protocols are
Which of the following ISO level is more closely related to the physical communications facilities?
Which of the following ISO level is more closely related to the physical communications facilities?
What are the most commonly used transmission speeds in BPS used in data communication?
What are the most commonly used transmission speeds in BPS used in data communication?
"BAUD" rate means
"BAUD" rate means
The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to
The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to
Which of the following is a wrong example of network layer?
Which of the following is a wrong example of network layer?
Which of the following is required to communicate between two computers?
Which of the following is required to communicate between two computers?
Which of the following types of channels moves data relatively slowly?
Which of the following types of channels moves data relatively slowly?
How many Character per sec(7bits + 1parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 "Start" and 1 "stop" bit)?
How many Character per sec(7bits + 1parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 "Start" and 1 "stop" bit)?
The Internet Control Message Protocol (ICMP)
The Internet Control Message Protocol (ICMP)
What is Cladding?
What is Cladding?
A high speed communication equipment typically would not be needed for
A high speed communication equipment typically would not be needed for
Which of the following is used for modulation and demodulation?
Which of the following is used for modulation and demodulation?
Which of the following does not allow multiple users or devices to share one communications line?
Which of the following does not allow multiple users or devices to share one communications line?
Frames from one LAN can be transmitted to another LAN via the device
Frames from one LAN can be transmitted to another LAN via the device
How many hosts are attached to each of the local area networks at your site?
How many hosts are attached to each of the local area networks at your site?
An error-detecting code inserted as a field in a block of data to be transmitted is known as
An error-detecting code inserted as a field in a block of data to be transmitted is known as
Satellite-Switched Time-Division Multiple Access (SS/TDMA) is
Satellite-Switched Time-Division Multiple Access (SS/TDMA) is
Avalanche photodiode receivers can detect hits of transmitted data by receiving
Avalanche photodiode receivers can detect hits of transmitted data by receiving
In CRC there is no error if the remainder at the receiver is _____.
In CRC there is no error if the remainder at the receiver is _____.
ICMP (Internet Control Message Protocol) is
ICMP (Internet Control Message Protocol) is
What part of 192.168.10.51 is the Network ID, assuming a default subnet mask?
What part of 192.168.10.51 is the Network ID, assuming a default subnet mask?
Maximum data rate of a channel for a noiseless 3-kHz binary channel is
Maximum data rate of a channel for a noiseless 3-kHz binary channel is
Data communications system depends on four fundamental characteristics
Data communications system depends on four fundamental characteristics
Which of the followings is used in communications is referred to as unshielded twisted-pair (UTP)?
Which of the followings is used in communications is referred to as unshielded twisted-pair (UTP)?
The packets switching concept was first proposed
The packets switching concept was first proposed
In session layer, during data transfer, the data stream responsible for the "control" purpose (i.e control of the session layer itself) is
In session layer, during data transfer, the data stream responsible for the "control" purpose (i.e control of the session layer itself) is
Select correct type of line configuration:
Select correct type of line configuration:
Usually, it takes 10-bits to represent one character. How many characters can be transmitted at a speed of 1200 BPS?
Usually, it takes 10-bits to represent one character. How many characters can be transmitted at a speed of 1200 BPS?
A terminal multiplexer has six 1200 bps terminals and 'n' 300bps terminals connected to it. The outgoing line is 9600bps. What is the maximum value of n?
A terminal multiplexer has six 1200 bps terminals and 'n' 300bps terminals connected to it. The outgoing line is 9600bps. What is the maximum value of n?
Contention is
Contention is
Which of the following TCP/IP protocol is used for transferring electronic mail messages from one machine to another?
Which of the following TCP/IP protocol is used for transferring electronic mail messages from one machine to another?
When you ping the loopback address, a packet is sent where?
When you ping the loopback address, a packet is sent where?
The ________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.
The ________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.
Twisted pair wires, coaxial cable, optical fiber cables are the examples of:
Twisted pair wires, coaxial cable, optical fiber cables are the examples of:
In a broad Sense, a railway track is an example of
In a broad Sense, a railway track is an example of
Internet-like networks within an enterprise.
Internet-like networks within an enterprise.
The topology with highest reliability is:
The topology with highest reliability is:
What is the port number for NNTP?
What is the port number for NNTP?
Correct method for full duplex mode of communication is:
Correct method for full duplex mode of communication is:
Switching at the network layer in the Internet uses the datagram approach to:
Switching at the network layer in the Internet uses the datagram approach to:
The _____ houses the switches in token ring.
The _____ houses the switches in token ring.
You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?
You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?
Which of the following refers to the terms "residual error rate"?
Which of the following refers to the terms "residual error rate"?
Eight stations are competing for the use of a shared channel using the 'Adaptive tree Walk Protocol'. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?
Eight stations are competing for the use of a shared channel using the 'Adaptive tree Walk Protocol'. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?
which of the following is not a field in the Ethernet Message packet?
which of the following is not a field in the Ethernet Message packet?
00 represents a pixel that pixel is known as :
00 represents a pixel that pixel is known as :
A noiseless 3 KHz Channel transmits bits with binary level signals. What is the maximum data rate?
A noiseless 3 KHz Channel transmits bits with binary level signals. What is the maximum data rate?
Which network has connectivity range up to 10 meters?
Which network has connectivity range up to 10 meters?
Number of Unguided Media is:
Number of Unguided Media is:
The method of communication in which transmission takes place in both directions, but only one direction at a time is called
The method of communication in which transmission takes place in both directions, but only one direction at a time is called
What device separates a single network into two segments but lets the two segments appear as one to higher protocols?
What device separates a single network into two segments but lets the two segments appear as one to higher protocols?
If one link fails, only that link is affected. All other links remain active. Which topology does this?
If one link fails, only that link is affected. All other links remain active. Which topology does this?
How many bits internet address is assigned to each host on a TCP/IP internet which is used in all communications with the host?
How many bits internet address is assigned to each host on a TCP/IP internet which is used in all communications with the host?
Which is also known as a connectionless protocol for a packet-switching network that uses the Datagram approach?
Which is also known as a connectionless protocol for a packet-switching network that uses the Datagram approach?
The geostationary satellite used for communication systems
The geostationary satellite used for communication systems
Telecommunication networks frequently interconnect an organization with its customers and suppliers. Select the best fit for answer:
Telecommunication networks frequently interconnect an organization with its customers and suppliers. Select the best fit for answer:
What is the default subnet mask for a class C network?
What is the default subnet mask for a class C network?
The synchronous modems are more costly than the asynchronous modems because
The synchronous modems are more costly than the asynchronous modems because
A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used?
A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used?
What is Unicode?
What is Unicode?
For data communications to occur, the communicating devices must be part of a communication system made up of a combination of?
For data communications to occur, the communicating devices must be part of a communication system made up of a combination of?
The cheapest modems can transmit
The cheapest modems can transmit
Select the wrong data communication system component:
Select the wrong data communication system component:
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver
Which switch is a multistage switch with micro switches at each stage that route the packets based on the output port represented as a binary string?
Which switch is a multistage switch with micro switches at each stage that route the packets based on the output port represented as a binary string?
Which of the following statements is correct for the use of packet switching?
Which of the following statements is correct for the use of packet switching?
The number of cross point needed for 10 lines in a cross point switch which is full duplex in nature and there are no self connection is
The number of cross point needed for 10 lines in a cross point switch which is full duplex in nature and there are no self connection is
OSI model means:
OSI model means:
What is the usual number of bits transmitted simultaneously in parallel data transmission used by microcomputers?
What is the usual number of bits transmitted simultaneously in parallel data transmission used by microcomputers?
Time required for a message to travel from one device to another is known as:
Time required for a message to travel from one device to another is known as:
The research and development department at your office has been experimenting with different technologies to help improve the performance of the network. One group has been examining the use of a broadband network versus a based band network. Select the correct statement about broadband and baseband.
The research and development department at your office has been experimenting with different technologies to help improve the performance of the network. One group has been examining the use of a broadband network versus a based band network. Select the correct statement about broadband and baseband.
Which of the following device is used to connect two systems, especially if the systems use different protocols?
Which of the following device is used to connect two systems, especially if the systems use different protocols?
How many digits of the DNIC (Data Network Identification Code) identify the country?
How many digits of the DNIC (Data Network Identification Code) identify the country?
Which of the following technique is used for fragment?
Which of the following technique is used for fragment?
With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts?
With an IP address of 100, you currently have 80 subnets. What subnet mask should you use to maximize the number of available hosts?
Start and stop bits are used in serial communication for
Start and stop bits are used in serial communication for
If you get both local and remote echoes, every character you type will appear on the screen
If you get both local and remote echoes, every character you type will appear on the screen
Which one of the following network uses dynamic or adaptive routing?
Which one of the following network uses dynamic or adaptive routing?
Which of the following condition is used to transmit two packets over a medium at the same time?
Which of the following condition is used to transmit two packets over a medium at the same time?
The receive equalizer reduces delay distortions using a
The receive equalizer reduces delay distortions using a
Your company has a LAN in its downtown office and has now set up a LAN in the manufacturing plant in the suburbs. To enable everyone to share data and resources between the two LANs, what type of device(s) are needed to connect them? Choose the most correct answer.
Your company has a LAN in its downtown office and has now set up a LAN in the manufacturing plant in the suburbs. To enable everyone to share data and resources between the two LANs, what type of device(s) are needed to connect them? Choose the most correct answer.
Select the cable that uses copper conductor, accept and transport signals in the form of electric current?
Select the cable that uses copper conductor, accept and transport signals in the form of electric current?
A remote batch-processing operation in which data is solely input to a central computer would require a:
A remote batch-processing operation in which data is solely input to a central computer would require a:
The Network topology that supports bi-directional links between each possible node is
The Network topology that supports bi-directional links between each possible node is
What can greatly reduce TCP/IP configuration problems?
What can greatly reduce TCP/IP configuration problems?
Which network is a cross between circuits switched network and a data-gram network?
Which network is a cross between circuits switched network and a data-gram network?
To connect a computer with a device in the same room, you might be likely to use
To connect a computer with a device in the same room, you might be likely to use
The slowest transmission speeds are those of
The slowest transmission speeds are those of
Which of the following summation operations is performed on the bits to check an error-detecting code?
Which of the following summation operations is performed on the bits to check an error-detecting code?
A data communications system has:
A data communications system has:
Unmodulated signal coming from a transmitter is know as
Unmodulated signal coming from a transmitter is know as
Which of the following is not a disadvantage of wireless LAN?
Which of the following is not a disadvantage of wireless LAN?
Select the correct cable that transport signals in the form of light:
Select the correct cable that transport signals in the form of light:
A front-end processor is
A front-end processor is
Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine?
Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine?
Error detection at the data link level is achieved by
Error detection at the data link level is achieved by
Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?
Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?
A distributed network configuration in which all data/information pass through a central computer is
A distributed network configuration in which all data/information pass through a central computer is
