List of top Data Science A.I Cyber Security and Computer Sci. Questions on Computer Networks

Consider the following statements about flow and error control :
A. Go-Back-N retransmits only the frame that is lost

B. Selective Repeat improves the bandwidth utilization over Go-Back-N

C. Parity bits can detect all single-bit errors

D. Stop and wait protocol achieves high channel utilization on long-delay networks

E. Cyclic Redundancy check provides stronger error detection than single parity

Choose the correct answer from the options given below :

Consider the 802.3 MAC frame fields from left to right :
A. Preamble

B. Source address

C. SFD

D. Destination address

Choose the correct answer from the options given below :

Given below are two statements :
one is labelled as
Assertion (A) and the other is labelled as
Reason (R).
Assertion (A) :
TCP provides reliable, in-order delivery of data segments using sequence numbers.
Reason (R) :
TCP ensures security and confidentiality of transmitted data.
In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements :
one is labelled as
Assertion (A) and the other is labelled as
Reason (R).
Assertion (A) :
TCP uses sequence numbers to ensure reliable, in-order delivery of data segment.
Reason (R) :
Sequence number helps detect packet duplication and reordering in transmission.
In the light of the above statements, choose the most appropriate answer from the options given below :

Which of the following is not correct IP address ?

Suppose we can download 10 pages per minut
E. A page has 24 lines on average and a line has 80 characters on averag
E. Assuming 8 bits per character, the bit rate is :

Which of the following is not a valid address in an internet employing the TCP/IP protocols ?

In a Class B subnet, we know the IP address of one host and the mask as given below: IP address = 125.134.112.66 Mask = 255.255.224.0 What is the first address (Network address)?

A system transmits a block of information containing ten packets each with eight data bits, a start bit, and a stop bit. Additional 'overhead' bits include a 4-bit synchronization code at the beginning of the block and a parity bit at the end of the block. What is the transmission efficiency?

Packet filtering firewalls are deployed on:

Ten signals, each requiring 4000 Hz, are multiplexed onto a single channel using FDM. How much minimum bandwidth is required for the multiplexed channel? Assume that the guard bands are 400 Hz wide.

In an HTTP request message, the first line is called:

Consider a scenario in which DHCP clients and servers are on the same subnet. Here the communication between DHCP clients and servers will take place via:

Consider the following statement(s) and choose the correct one.
1. PoP3 does not allow the user to organize his mail on the server.
2. In IMAP4, the user can search the contents of the email for a specific string of characters prior to downloading.
3. MIME is a supplementary protocol that allows ASCII data to be sent through email.
Choose the correct answer from the options given below:

The following data fragment occurs in the middle of the data stream for which the byte stuffing algorithm is used: A B ESC C ESC FLAG ESC FLAG D. What is the output after stuffing?

Typically, e-mail systems support five basic functions. Arrange them in sequence.
(A) Displaying
(B) Transfer
(C) Composition
(D) Disposition
(E) Reporting
Choose the correct answer from the options given below: