Computer Networks Practice Test 5

1. In frame relay networks, extended address is used _______

for error detection

for error recovery

for encryption

to increase the range of data link connection identifiers

2. The receiver of the data controls the amount of data that are to be sent by the sender is referred to as ___________

Error control

Error detection

Congestion control

Flow control

3. Connection establishment in TCP is done by which mechanism?

Flow control

Synchronization

Forwarding

Three-Way Handshaking

4. The value of acknowledgement field in a segment defines _______

sequence number of the next byte to be received

sequence of zeros and ones

sequence number of the byte received previously

total number of bytes to receive

5. Discarding policy is mainly done by _______

Sender

Switch

Receiver

Router

6. Beyond IP, UDP provides additional services such as _______

Sending and receiving of packets

Multiplexing and demultiplexing

Demultiplexing and error checking

Routing and switching

7. In data transfer phase, how many columns does the table contain?

8. 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?

Denial-of-service attack

Passive attack

SYNC flooding attack

Active attack

9. In TCP, sending and receiving data is done as _______

Stream of bytes

Packets

Lines of data

Sequence of characters

10. 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 ___________

All the packets

Packet which are not lost

Only those packets which are lost or corrupted

Packet from starting