What type of RJ45 UTP cable is used between switches?
Answer: A
Correct answer: Crossover cable
Two devices of the same kind - switch to switch, PC to PC - need a crossover cable, which swaps the transmit and receive pairs so that each device's transmitter meets the other's receiver. A straight-through cable is for connecting unlike devices, such as PC to switch.
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Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet?
1. Half-duplex Ethernet operates in a shared collision domain.
2. Half-duplex Ethernet operates in a private collision domain.
3. Half-duplex Ethernet has higher effective throughput.
4. Half-duplex Ethernet has lower effective throughput.
Answer: C
Correct answer: 1 and 4
Half-duplex Ethernet cannot send and receive at once, so every station shares one collision domain and must use CSMA/CD to detect and recover from collisions. Full duplex has a separate path each way, so collisions cannot occur and collision detection is switched off.
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Mosaic is a
Answer: C
Correct answer: Web browser
Mosaic, released in 1993, was the first widely used graphical web browser and the ancestor of Netscape.
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For transferring files from one host to another host over a tcp network which protocol we use
Answer: B
Correct answer: FTP
FTP - File Transfer Protocol - is designed for moving files between hosts over TCP. SMTP carries mail, which is a different service.
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Mini computers are used as a server in
Answer: A
Correct answer: LAN
A minicomputer serving a single site's users is acting as a server on a local area network. PROM is a memory device and does not belong in the list at all.
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________ uses asynchronous time –division multiplexing and encodes data into small, Fixed-size cells
Answer: B
Correct answer: ATM
ATM - Asynchronous Transfer Mode - carries all traffic in fixed 53-byte cells and multiplexes them asynchronously, which is what allows voice and data to share one link with predictable delay. SONET is the transmission system such cells may travel over.
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Every node on the network is connected through a central device is called _____ topology.
Answer: C
Correct answer: Star
In a star topology every node has its own link to a central hub or switch, so all traffic passes through that centre. That makes cabling simple and one node's failure harmless, at the cost of depending entirely on the central device.
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When data is encapsulated, which is the correct order?
Answer: B
Correct answer: Data, segment, packet, frame, bit
Encapsulation adds a header at each layer going down the stack: the application's data becomes a segment at the transport layer, a packet at the network layer, a frame at the data link layer, and finally bits on the wire.
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Segmentation of a data stream happens at which layer of the OSI model?
Answer: D
Correct answer: Transport
Breaking a stream of application data into pieces small enough to send, and reassembling them at the far end, is the transport layer's work - which is why its unit is called a segment.
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What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?
Answer: C
Correct answer: Rolled
A rolled, or rollover, cable reverses the order of all eight wires and is used to reach a router or switch console port from a PC's serial port. It carries no Ethernet signalling at all, which is why neither straight-through nor crossover will do.
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