Computer Knowledge
Computer Networks
2,461 Questions
Computer networks involve the architecture, protocols, and security measures used for digital communication. This collection covers OSI model layers, IP addressing, data transmission, and cryptographic standards. These concepts are vital for the computer knowledge sections of banking and government exams.
OSI model layersNetwork protocolsIP subnet maskingData encryption standardsServer configurationsNetwork commands
Computer Networks Questions
-
Framing
-
Error control
-
Crash recovery
-
Flow control
-
Link management
C
Correct answer
Explanation
Crash recovery is a function of the transport layer.
-
Go back n
-
Selective repeat
-
Stop and wait protocol
-
Positive acknowledgement with retransmission (PAR)
-
Both (1) and (2)
E
Correct answer
Explanation
Both (1) and (2) use pipelining.
-
1-persistent CSMA
-
p-persistent CSMA
-
Non persistent CSMA
-
CSMA / CD
-
None of the above
B
Correct answer
Explanation
This station transmits with probability p if channel is idle with probability q = 1 - p. It defers until the next slot and so is applied to slotted channels.
-
Packet discarding
-
Isarithmic congestion control
-
Sending choke packets
-
Flow control
-
Pre-allocation of buffers
D
Correct answer
Explanation
It cannot really solve congestion problems because computer traffic is bursty.
-
Establishing a connection
-
Releasing a connection
-
Buffering
-
Multiplexing
-
Crash recovery
A
Correct answer
Explanation
Three-way handshake is useful to solve the problem of duplicate connection requests.
-
Transit delay
-
Connection establishment delay
-
Throughput
-
Residual error rate
-
Resilience
C
Correct answer
Explanation
It measures number of bytes of user data transferred per sec, over a time interval.
-
Fraction of times the agreed upon goals were not met.
-
Fraction of connection release attempts that did not complete.
-
Probability of transport layer terminating a connection.
-
Chance of connection not being established within the maximum establishment delay time.
-
None of the above
B
Correct answer
Explanation
It is measured by Connection Release Failure Probability.
-
Class A
-
Class B
-
Class C
-
Class D
-
Class E
D
Correct answer
Explanation
The range of Class D addresses is from 224.0.0.0 - 239.255.255.255. Hence, this address belongs to this class.
-
Message
-
Segment
-
Datagram
-
Frame
-
Jumbogram
A
Correct answer
Explanation
The data unit created at the application layer is called a message.
-
EBIPS
-
EBICS
-
TCP/IP
-
FTP
-
None of these
B
Correct answer
Explanation
The Electronic Banking Internet Communication Standard (EBICS) is a transmission protocol for banking information for usage by banking clients.
-
Router
-
Protocol
-
Firewall
-
Packet filtering
-
Cache
C
Correct answer
Explanation
This insulates a private network form a public network using carefully established controls on the types of request they will route through to the private network for processing and fulfillment.
E
Correct answer
Explanation
Extensible Messaging and Presence Protocol (XMPP) is a communications protocol for message-oriented middleware based on XML (Extensible Markup Language). It enables the near-real-time exchange of structured yet extensible data between any two or more network entities.
B
Correct answer
Explanation
RARP stands for Reverse Address Resolution Protocol. It is used by a diskless machine to obtain its IP address from the server.
-
cutoff proxy
-
dynamic packet filter
-
circuit level gateway
-
stateful inspection
-
air gap
A
Correct answer
Explanation
The cutoff proxy is a hybrid combination of a dynamic (stateful) packet filter and a circuit level proxy.
-
Static packet filter only examines IP and TCP headers.
-
Static packet filter offers low level of security.
-
Static packet filter lacks state awareness.
-
Static packet filter can be established without following the RFC-recommended 3 way-handshake.
-
Static packet filter is susceptible to IP spoofing.
D
Correct answer
Explanation
It is a disadvantage of dynamic (state aware) packet filter.