McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Electrical Engineering , Bachelor of Science in Computer Science TY (BSc CS) , Bachelor of Science in Information Technology FY (BSc IT) , Bachelor of Science in Information Technology SY (BSc IT) .
| 451. |
Which one of the following is not true? |
| A. | telnet defines a network virtual terminal (nvt) standard |
| B. | client programs interact with nvt |
| C. | server translates nvt operations |
| D. | client can transfer files using to remote server using nvt |
| Answer» D. client can transfer files using to remote server using nvt | |
| 452. |
All telnet operations are sent as ________ |
| A. | 4 bits |
| B. | 8 bits |
| C. | 16 bits |
| D. | 32 bits |
| Answer» B. 8 bits | |
| 453. |
AbsoluteTelnet is a telnet client for _______ Operating system. |
| A. | windows |
| B. | linux |
| C. | mac |
| D. | ubuntu |
| Answer» A. windows | |
| 454. |
The decimal code of Interpret as Command (IAC) character is _______ |
| A. | 252 |
| B. | 253 |
| C. | 254 |
| D. | 255 |
| Answer» D. 255 | |
| 455. |
Which of the following is false with respect to TCP? |
| A. | connection-oriented |
| B. | process-to-process |
| C. | transport layer protocol |
| D. | unreliable |
| Answer» D. unreliable | |
| 456. |
In TCP, sending and receiving data is done as _______ |
| A. | stream of bytes |
| B. | sequence of characters |
| C. | lines of data |
| D. | packets |
| Answer» A. stream of bytes | |
| 457. |
TCP groups a number of bytes together into a packet called _______ |
| A. | packet |
| B. | buffer |
| C. | segment |
| D. | stack |
| Answer» C. segment | |
| 458. |
Communication offered by TCP is ________ |
| A. | full-duplex |
| B. | half-duplex |
| C. | semi-duplex |
| D. | byte by byte |
| Answer» A. full-duplex | |
| 459. |
The value of acknowledgement field in a segment defines _______ |
| A. | sequence number of the byte received previously |
| B. | total number of bytes to receive |
| C. | sequence number of the next byte to be received |
| D. | sequence of zeros and ones |
| Answer» C. sequence number of the next byte to be received | |
| 460. |
Size of TCP segment header ranges between ___________ |
| A. | 16 and 32 bytes |
| B. | 16 and 32 bits |
| C. | 20 and 60 bytes |
| D. | 20 and 60 bits |
| Answer» C. 20 and 60 bytes | |
| 461. |
Connection establishment in TCP is done by which mechanism? |
| A. | flow control |
| B. | three-way handshaking |
| C. | forwarding |
| D. | synchronization |
| Answer» B. three-way handshaking | |
| 462. |
SYNC flooding attack belongs to a type of security attack known as ___________ |
| A. | sync flooding attack |
| B. | active attack |
| C. | passive attack |
| D. | denial-of-service attack |
| Answer» D. denial-of-service attack | |
| 463. |
What allows TCP to detect lost segments and in turn recover from that loss? |
| A. | sequence number |
| B. | acknowledgment number |
| C. | checksum |
| D. | both sequence & acknowledgment number |
| Answer» B. acknowledgment number | |
| 464. |
Which of the following is false with respect to UDP? |
| A. | connection-oriented |
| B. | unreliable |
| C. | transport layer protocol |
| D. | low overhead |
| Answer» A. connection-oriented | |
| 465. |
Return value of the UDP port “Chargen” is _______ |
| A. | string of characters |
| B. | string of integers |
| C. | array of characters with integers |
| D. | array of zero’s and one’s |
| Answer» A. string of characters | |
| 466. |
Beyond IP, UDP provides additional services such as _______ |
| A. | routing and switching |
| B. | sending and receiving of packets |
| C. | multiplexing and demultiplexing |
| D. | demultiplexing and error checking |
| Answer» D. demultiplexing and error checking | |
| 467. |
What is the main advantage of UDP? |
| A. | more overload |
| B. | reliable |
| C. | low overhead |
| D. | fast |
| Answer» C. low overhead | |
| 468. |
Port number used by Network Time Protocol (NTP) with UDP is ________ |
| A. | 161 |
| B. | 123 |
| C. | 162 |
| D. | 124 |
| Answer» B. 123 | |
| 469. |
What is the header size of a UDP packet? |
| A. | 8 bytes |
| B. | 8 bits |
| C. | 16 bytes |
| D. | 124 bytes |
| Answer» A. 8 bytes | |
| 470. |
The port number is “ephemeral port number”, if the source host is _______ |
| A. | ntp |
| B. | echo |
| C. | server |
| D. | client |
| Answer» D. client | |
| 471. |
“Total length” field in UDP packet header is the length of _________ |
| A. | only udp header |
| B. | only data |
| C. | only checksum |
| D. | udp header plus data |
| Answer» D. udp header plus data | |
| 472. |
Which is the correct expression for the length of UDP datagram? |
| A. | udp length = ip length – ip header’s length |
| B. | udp length = udp length – udp header’s length |
| C. | udp length = ip length + ip header’s length |
| D. | udp length = udp length + udp header’s length |
| Answer» A. udp length = ip length – ip header’s length | |
| 473. |
The ______ field is used to detect errors over the entire user datagram. |
| A. | udp header |
| B. | checksum |
| C. | source port |
| D. | destination port |
| Answer» B. checksum | |
| 474. |
IPsec defines two protocols: _______ and ________ |
| A. | ah; ssl |
| B. | pgp; esp |
| C. | ah; esp |
| D. | pgp; ssl |
| Answer» C. ah; esp | |
| 475. |
IP Security operates in which layer of the OSI model? |
| A. | network |
| B. | transport |
| C. | application |
| D. | physical |
| Answer» A. network | |
| 476. |
ESP does not provide ________ |
| A. | source authentication |
| B. | data integrity |
| C. | privacy |
| D. | error control |
| Answer» D. error control | |
| 477. |
Two broad categories of congestion control are |
| A. | open-loop and closed-loop |
| B. | open-control and closed-control |
| C. | active control and passive control |
| D. | active loop and passive loop |
| Answer» A. open-loop and closed-loop | |
| 478. |
In open-loop control, policies are applied to __________ |
| A. | remove after congestion occurs |
| B. | remove after sometime |
| C. | prevent before congestion occurs |
| D. | prevent before sending packets |
| Answer» C. prevent before congestion occurs | |
| 479. |
Retransmission of packets must not be done when _______ |
| A. | packet is lost |
| B. | packet is corrupted |
| C. | packet is needed |
| D. | packet is error-free |
| Answer» D. packet is error-free | |
| 480. |
Discarding policy is mainly done by _______ |
| A. | sender |
| B. | receiver |
| C. | router |
| D. | switch |
| Answer» C. router | |
| 481. |
Closed-Loop control mechanisms try to _________ |
| A. | remove after congestion occurs |
| B. | remove after sometime |
| C. | prevent before congestion occurs |
| D. | prevent before sending packets |
| Answer» A. remove after congestion occurs | |
| 482. |
Backpressure technique can be applied only to _______ |
| A. | congestion networks |
| B. | closed circuit networks |
| C. | open circuit networks |
| D. | virtual circuit networks |
| Answer» D. virtual circuit networks | |
| 483. |
The packet sent by a node to the source to inform it of congestion is called _______ |
| A. | explicit |
| B. | discard |
| C. | choke |
| D. | backpressure |
| Answer» C. choke | |
| 484. |
Which of the following is not a characteristic of Virtual Circuit Network? |
| A. | there are setup and teardown phases in addition to the data transfer phase |
| B. | resources can be allocated during setup phase or on demand |
| C. | all packets follow the same path established during the connection |
| D. | virtual circuit network is implemented in application layer |
| Answer» D. virtual circuit network is implemented in application layer | |
| 485. |
Which of the following is not a phase of virtual circuit network? |
| A. | setup phase |
| B. | data transfer phase |
| C. | termination phase |
| D. | teardown phase |
| Answer» C. termination phase | |
| 486. |
Steps required in setup process are ___________ |
| A. | setup request and acknowledgement |
| B. | setup request and setup response |
| C. | setup request and setup termination |
| D. | setup and termination steps |
| Answer» A. setup request and acknowledgement | |
| 487. |
Delay of the resource allocated during setup phase during data transfer is ________ |
| A. | constant |
| B. | increases for each packet |
| C. | same for each packet |
| D. | different for each packet |
| Answer» C. same for each packet | |
| 488. |
Delay of the resource allocated on demand during data transfer is ________ |
| A. | constant |
| B. | increases for each packet |
| C. | same for each packet |
| D. | different for each packet |
| Answer» D. different for each packet | |
| 489. |
In data transfer phase, how many columns does the table contain? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 490. |
ATM and frame relay are ________ |
| A. | virtual circuit networks |
| B. | datagram networks |
| C. | virtual private networks |
| D. | virtual public networks |
| Answer» A. virtual circuit networks | |
| 491. |
ATM uses _______________ |
| A. | asynchronous frequency division multiplexing |
| B. | asynchronous time division multiplexing |
| C. | asynchronous space division multiplexing |
| D. | asynchronous amplitude division multiplexing |
| Answer» B. asynchronous time division multiplexing | |
| 492. |
ATM standard defines _______ layers. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 493. |
ATM can be used for ________ |
| A. | local area network |
| B. | wide area network |
| C. | campus area network |
| D. | networks covering any range |
| Answer» D. networks covering any range | |
| 494. |
An ATM cell has the payload field of __________ |
| A. | 32 bytes |
| B. | 48 bytes |
| C. | 64 bytes |
| D. | 128 bytes |
| Answer» B. 48 bytes | |
| 495. |
Frame relay has error detection at the ______ |
| A. | physical layer |
| B. | data link layer |
| C. | network layer |
| D. | transport layer |
| Answer» B. data link layer | |
| 496. |
Virtual circuit identifier in frame relay is called ______ |
| A. | data link connection identifier |
| B. | frame relay identifier |
| C. | cell relay identifier |
| D. | circuit connection identifier |
| Answer» A. data link connection identifier | |
| 497. |
Frame relay has _______ |
| A. | only physical layer |
| B. | only data link layer |
| C. | only network layer |
| D. | both physical and data link layer |
| Answer» D. both physical and data link layer | |
| 498. |
In frame relay networks, extended address is used _______ |
| A. | to increase the range of data link connection identifiers |
| B. | for error detection |
| C. | for encryption |
| D. | for error recovery |
| Answer» A. to increase the range of data link connection identifiers | |
| 499. |
What is FRAD in frame relay network? |
| A. | frad assembles and disassembles the frames coming from other protocols |
| B. | frad is used for modulation and demodulation |
| C. | frad is used for error detection |
| D. | frad is used for error recovery |
| Answer» A. frad assembles and disassembles the frames coming from other protocols | |
| 500. |
Frame Relay is cheaper than other _____ |
| A. | lans |
| B. | wans |
| C. | mans |
| D. | multipoint networks |
| Answer» B. wans | |
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