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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What is the name of the topology in which if the cable of a computer network is broken then the whole network goes down?
Answer: C
Correct answer: Bus
In a bus every station taps into one shared cable, so a break in it divides or disables the whole segment. A star gives each node its own cable, and a ring or mesh can often route around a failure.
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The resources to all the computers in network are provided by the server which is a computer and they are connected by
Answer: C
Correct answer: Network
The server and the machines it serves are joined by a network; the clients are what it serves rather than what connects them.
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The first network to implement TCP/IP are
Answer: A
Correct answer: ARPANET
ARPANET adopted TCP/IP on 1 January 1983, which is the moment the internet as a protocol family begins. The internet grew out of ARPANET rather than preceding it.
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_______ is the process of dividing a link, the physical medium, into logical channels for better efficiency
Answer: C
Correct answer: Multiplexing
Multiplexing divides one physical link into several logical channels - by frequency, by time slot or by code - so that a costly medium carries many conversations at once instead of one.
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Based on the packet’s address, the device that has been designed to forward packets to specific ports is
Answer: D
Correct answer: Switching hub
A switching hub, or switch, reads the destination address in each frame and forwards it only to the port where that address lies, instead of repeating it to every port as a plain hub does.
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P2P is a ............ application architecture.
Answer: A
Correct answer: distributed
In peer-to-peer every node acts as both client and server, so there is no central machine and the work and data are spread across the participants. That is a distributed architecture; client/server is precisely the arrangement it dispenses with.
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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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WAN stands for
Answer: B
Correct answer: Wide area network
WAN stands for Wide Area Network - a network spanning cities or countries, in contrast with the LAN's single site.
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Which protocol is used to retrieve email from a mail server to a local client ?
Answer: C
Correct answer: POP3
POP3 downloads messages from the server to the client, whereas SMTP is used to send mail outward. The two work together: SMTP delivers a message to the recipient’s server and POP3 or IMAP fetches it from there.
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