Computer Networks MCQs
998+ questions with answers
Suppose a TCP connection is transferring a file of 1000 bytes. The first byte is numbered 10001. What is the sequence number of the segment if all data is sent in only one segment?
Bytes of data being transferred in each connection are numbered by TCP. These numbers start with a _________
The value of acknowledgement field in a segment defines _______
The receiver of the data controls the amount of data that are to be sent by the sender is referred to as ___________
Size of TCP segment header ranges between ___________
Connection establishment in TCP is done by which mechanism?
The server program tells its TCP that it is ready to accept a connection. This process is called ___________
A client that wishes to connect to an open server tells its TCP that it needs to be connected to that particular server. The process is called ___________
A malicious attacker sends a large number of SYNC segments to a server, pretending that each of them is coming from a different client by faking the source IP address in the datagram. Which type of attack is being performed in this situation?
SYNC flooding attack belongs to a type of security attack known as ___________
The sizes of source and destination port address in TCP header are ___________ respectively.
What allows TCP to detect lost segments and in turn recover from that loss?
Which of the following is false with respect to UDP?
Return value of the UDP port “Chargen” is _______
Beyond IP, UDP provides additional services such as _______
What is the main advantage of UDP?
Port number used by Network Time Protocol (NTP) with UDP is ________
What is the header size of a UDP packet?
“Total length” field in UDP packet header is the length of _________
Which is the correct expression for the length of UDP datagram?
The ______ field is used to detect errors over the entire user datagram.
Which layer is more helpful in providing reliable data transmission service?
Which protocol works well over an inter network in case of reliability?
Which transport layer protocols are reliable?
Which of the following mechanism is used by the TCP to guard the receiver from data overwhelming?
Which of the following protocol(s) supports uni-casting?
What is the sequence of phases in TCP connection?
Which of the following is not related to Transport control protocol?
Which of the following is not a similarity between transport control protocol and user datagram protocol?
Which mode of IPsec should you use to assure the security and confidentiality of data within the same LAN?
Which two types of encryption protocols can be used to secure the authentication of computers using IPsec?
Which two types of IPsec can be used to secure communications between two LANs?
IPsec defines two protocols: _______ and ________
ESP does not provide ________
In computer security _______ means that computer system assets can be modified only by authorized parities.
In computer security _______ means that the information in a computer system only be accessible for reading by authorized parities.
Which of the following organizations is primarily concerned with military encryption systems?
Two broad categories of congestion control are
In open-loop control, policies are applied to __________
Retransmission of packets must not be done when _______
In Go-Back-N window, when the timer of the packet times out, several packets have to be resent even some may have arrived safe. Whereas in Selective Repeat window, the sender resends ___________
Discarding policy is mainly done by _______
The technique in which a congested node stops receiving data from the immediate upstream node or nodes is called as _______
Backpressure technique can be applied only to _______
The packet sent by a node to the source to inform it of congestion is called _______
In the slow-start algorithm, the size of the congestion window increases __________ until it reaches a threshold.
Which of the following is not a characteristic of Virtual Circuit Network?
The address that is unique in the scope of the network or internationally if the network is part of an international network is called as ______
The Identifier that is used for data transfer in virtual circuit network is called _______