Fourth layer of OSI reference model is
Answer: D
Correct answer: Transport layer
The OSI layers in order are physical, data link, network, transport, session, presentation and application. The fourth is therefore the transport layer.
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________ allow you to communicate with other computers using a phone line
Answer: D
Correct answer: Modem
A modem converts the computer's digital signal into a form a telephone line can carry, and converts it back at the far end - which is what the name, modulator-demodulator, records.
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Which fields are contained within an IEEE Ethernet frame header?
1. Source and destination MAC address
2. Source and destination network address
3. Source and destination MAC address and source and destination network address
4. FCS field
Answer: A
Correct answer: 1 and 4
An Ethernet frame header carries the source and destination MAC addresses; network-layer addresses live in the IP header inside the frame, where Ethernet neither reads nor uses them.
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Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?
Answer: C
Correct answer: Layer 4
Acknowledgements, sequence numbers and flow control are how a connection is made reliable, and reliability is the transport layer's responsibility - layer 4.
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A technique that reduce the size of saved file by elimination or encoding redundancies is called
Answer: C
Correct answer: Compression
Compression reduces a file's size by removing or re-encoding repetition. It is lossless when the original can be restored exactly and lossy when some detail is discarded for a greater saving.
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______ is commonly used data format for exchanging information between computers or programs
Answer: A
Correct answer: ASCII
ASCII assigns a number to each character, and because almost every system uses it, plain ASCII text is the lowest common denominator for exchanging data. HTML and XML are markup languages built on top of a character encoding rather than encodings themselves.
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In a computer, the binary system is used to
Answer: C
Correct answer: Process the data
A computer's circuits have two states, so everything it works on - instructions and data alike - must be represented in binary before it can be processed. Storage and display are consequences of that, not the reason for it.
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One can transmit and other can receive is called
Answer: D
Correct answer: Simplex
Simplex transmission goes one way only, as with a broadcast. Half duplex allows both directions but only one at a time, and full duplex both at once.
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_______ is example of Full duplex
Answer: D
Correct answer: Telephone
A telephone carries speech in both directions at the same time, which is full duplex. A walkie-talkie is half duplex - only one party may speak at a time - and a keyboard or monitor is simplex.
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Which of the following types of connections can use full duplex?
1. Hub to hub
2. Switch to switch
3. Host to host
4. Switch to hub
5. Switch to host
Answer: D
Correct answer: 2, 3 and 5
Full duplex needs a dedicated link between exactly two devices, so it works switch to switch, host to host with a crossover cable, and switch to host. A hub is a shared medium by construction, so any connection involving one must be half duplex.
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