Protocols are
- agreements on how communication components and DTEs are to communicate
- logical communication channels used for transferring data
- physical communication channels used for transferring data
- none of the above
Answer - (1) agreements on how communication components and DTEs are to communicate
The method of communication in which transmission takes place in both directions, but only in one direction at a time is called
- simplex
- four-wire circuit
- full-duplex
- half-duplex
Answer - (4) half-duplex
The unmodulated signal coming from a transmitter is known as
- carrier signal
- baseband signal
- primary signal
- none of the above
Answer - (2) baseband signal
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
Session layer
Transport layer
Application layer
MDI (Medium Dependent Interface)
Transport layer
Application layer
MDI (Medium Dependent Interface)
List-II
connects DCE into the physical channel
provides end to end connectivity
provides organized means to exchange data between users.
(like synchronization points)
supports an end-user process and performs the required file transfer.
A B C D
- 3 4 2 1
- 3 2 4 1
- 2 4 1 3
- 4 3 2 1
Answer - (2) 3 2 4 1
The Hamming distance between 001111 and 010011 is
- 1
- 2
- 3
- 4
Answer - (3) 3
Choose the correct statements (s)
- Baseband network uses analog technology
- Baseband network is Time Division Multiplexed
- Broadband network uses digital technology
- In a broadband network, the carrier signals operate at a lower frequency.
Answer - (2) Baseband network is Time Division Multiplexed
The _____________ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period
- Residual Error rate
- Transfer failure probability
- Connection release failure probability
- Connection establishment failure probability
Answer - (1) Residual Error rate
Which of the following ISO level is more closely related to the physical communications facilities?
- Application
- Session
- Network
- Datalink
Answer - (4) Datalink
Which of the following is not a field in the Ethernet message packet?
- Type
- Data
- Pin-code
- Address
Answer - (3) Pin-code
In a broad sense, a railway track is an example of
- simplex
- half-duplex
- full-duplex
- all of the above
Answer - (2) half-duplex
The frequency range at which the LAN coaxial cables will be used is
- 10^6 to 10^8 Hz
- 10^10 to 10^11 Hz
- 10^3 to 10^4 Hz
- 10^14 to 10^15 Hz
Answer - (1) 10^6 to 10^8 Hz
Match the following
1. Data link layer | (i) the lowest layer whose function is to activate, deactivate and maintain the circuit between DTE and DCE |
2. Physical layer | (ii) performs routing and communication |
3. Presentation layer | (iii) detection and recovery from errors in the transmitted data |
4. Network layer | (iv) concerned with the syntax of the data |
- 1-(iii), 2-(i), 3-(iv), 4-(ii)
- 1-(ii), 2-(i), 3-(iv), 4-(iii)
- 1-(iv), 2-(i), 3-(ii), 4-(iii)
- 1-(ii), 2-(i), 3-(iii), 4-(iv)
Answer - (1) 1-(iii), 2-(i), 3-(iv), 4-(ii)
A device that can convert digital signals to analog signals is
- a packet
- a modem
- an emulator
- none of the above
Answer - (2) a modem
Auto dialing allows
- you to dial a phone number by typing them on the keyboard
- a personal computer to answer incoming calls without human assistance
- both (a) and (b) above
- none of the above
Answer - (1) you to dial a phone number by typing them on the keyboard
A network that requires human intervention to route signals is called a
- bus network
- ring network
- star network
- T-switched network
Answer - (4) T-switched network
A packed-switching network
- is free
- can reduce the cost of using an information utility
- allows communications channels to be shared among more than one user
- both (b) and (c) above
Answer - (4) both (b) and (c) above
Local area networks can transmit
- faster than telecommunications over public telephone lines
- slower than telecommunications over public telephone lines
- using twisted-pair wiring or coaxial cables
- both (a) and (c) above
Answer - (4) both (a) and (c) above
A T-switch is used to
- control how messages are passed between computers
- echo every character that is received
- transmit characters one at a time
- rearrange the connections between computing equipment
Answer - (4) rearrange the connections between computing equipment
Bulletin board system
- is a public access message system
- is a modem capable of accepting commands
- converts analog signals to digital signals
- coverts digital signals to analog signals
Answer - (1) is a public access message system
FDDI is
- ring network
- star network
- mesh network
- bus-based network
Answer - (1) bus-based network
Note - More questions and answers will be added from time to time.
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