LAN Switching and Wireless

461. In the _________ Protocol, the sender sends its frames one after another with no regard to the receiver.

1. Stop-and-Wait
2. Simplest
3. Go-Back-N ARQ
4. Selective-Repeat ARQ

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462. In the _________ Protocol, the sender sends one frame, stops until it receives confirmation from the receiver, and then sends the next frame.

1. Stop-and-Wait
2. Simplest
3. Go-Back-N ARQ
4. Selective-Repeat ARQ

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463. In the _________method, a station that has a frame to send senses the line. If the line is idle, it sends immediately. If the line is not idle, it waits a random amount of time and then senses the line again.

1. nonpersistent
2. 1-persistent
3. p-persistent
4. none of the above

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464. In the _________Protocol, if no acknowledgment for a frame has arrived, we resend all outstanding frames.

1. Stop-and-Wait ARQ
2. Go-Back-N ARQ
3. Selective-Repeat ARQ
4. none of the above

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465. In the Ethernet frame, the _________ field contains error detection information.

1. CRC
2. preamble
3. address
4. none of the above

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466. In the Ethernet, the _________ field is actually added at the physical layer and is not (formally) part of the frame.

1. CRC
2. preamble
3. address
4. none of the above

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467. In the Go-Back-N Protocol, if the size of the sequence number field is 8, the sequence numbers are in _________ arithmetic,

1. modulo-2
2. modulo- 8
3. modulo-256
4. none of the above

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468. In the original ARPANET, _________ were directly connected together.

1. IMPs
2. host computers
3. networks
4. routers

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469. In the OSI model, as a data packet moves from the lower to the upper layers, headers are _________.

1. added
2. removed
3. rearranged
4. modified

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470. In the OSI model, encryption and decryption are functions of the _________ layer.

1. transport
2. session
3. presentation
4. application

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