Paper 2 CS · UNIT 09 · MOCK TEST

Mock 7 – Transport Layer: TCP & UDP (Part 1)

Unit 9: Data Communication and Computer Networks · 16 questions · about 19 minutes. Press End Mock any time to see your score and the correct answers.

All 13 topic-wise mocks in this unit

0 / 16 answered 00:00

Q1. Which of the following is/are true for UDP protocol?
A. It is called Uniform Data Protocol
B. It is called User Datagram Protocol
C. It belongs to Transport Layer
D. It belongs to Network Layer
Choose the correct answer from the options given below:

AA and C only BB and C only CA and D only DB and D only

Q2. Match List - I with List - II.

List - I	List - II
A. SMTP	I. Network layer
B. UDP	II. Transport layer
C. Ethernet	III. Application layer
D. IP	IV. Data Link layer

Choose the correct answer from the options given below:

AA-I, B-II, C-III, D-IV BA-III, B-II, C-IV, D-I CA-II, B-III, C-IV, D-I DA-I, B-II, C-IV, D-III

Q3. CB84000D001C001C is the content of a UDP header in hexadecimal format. The source port number is

A52100 B13 C28 D52000

Q4. The packet sent by a node to the source to inform it of congestion is called

AExplicit BBackpressure CChoke DRetransmission

Q5. Sequence the following stages of the sliding window protocol for flow control.
A. Sender moves the window to the next set of frames.
B. Sender sends a window of frames.
C. Receiver acknowledges the received frames.
D. If acknowledgment is not received, sender retransmits the frame.
Choose the correct answer from the options given below:

AB, A, C, D BB, C, D, A CB, D, C, A DB, C, A, D

Q6. Consider the three-way handshake during TCP connection establishment between hosts A and B. Let S and R be the random 32-bit initial sequence numbers chosen by A and B respectively. A sends a TCP segment with SYN = 1, SEQ = S and ACK bit = 0, and B accepts the connection request. Which of the following represents the information in the TCP header sent by B to A?

ASYN = 1, SEQ = S+1, ACK bit = 0, ACK number = R, FIN = 0 BSYN = 0, SEQ = R, ACK bit = 1, ACK number = S+1, FIN = 0 CSYN = 1, SEQ = R, ACK bit = 1, ACK number = S+1, FIN = 0 DSYN = 1, SEQ = R, ACK bit = 1, ACK number = S, FIN = 0

Q7. Which of the following is NOT a field in the TCP header?

ASequence Number BChecksum CFragmentation offset DWindow size

Q8. The work done by UDP is/are:
(A) Congestion control
(B) Flow control
(C) Retransmission
(D) Segment transmission
Choose the correct answer from the options given below:

A(A) and (D) Only B(C) Only C(D) Only D(B) and (C) Only

Q9. A TCP server application is programmed to listen on port P on host S. A TCP client is connected to the server over the network. While the TCP connection is active, the server crashes and reboots. Assume the client does not use the TCP keepalive timer. Which of the following behaviours is/are possible?
Statement I: The TCP server application on S can listen on P after reboot.
Statement II: If the client sends a packet after the server reboot, it will receive an RST segment.

ABoth Statement I and Statement II are correct BBoth Statement I and Statement II are incorrect CStatement I is correct but Statement II is incorrect DStatement I is incorrect but Statement II is correct

Q10. Services provided by the Point-to-Point Protocol (PPP):
A. Frame format
B. Establishment of the link
C. Flow control
D. Sequence numbering
E. Authentication
Choose the correct answer from the options given below:

AA, B and E Only BA, C and D Only CC, D and B Only DB, C and D Only

Q11. IP is responsible for ______ communication while TCP is responsible for ______ communication.

ANode-to-node, Host-to-host BProcess-to-process, Host-to-host CSocket-to-socket, Host-to-node DHost-to-host, Process-to-process

Q12. A computer on a 10 Mbps network is regulated by a token bucket. The token bucket is filled at a rate of 2 Mbps. It is initially filled to capacity with 16 megabits. What is the maximum duration for which the computer can transmit at the full 10 Mbps?

A1.6 seconds B2 seconds C5 seconds D8 seconds

Q13. A TCP server listens on port P on host S, and a client is connected to it. While the connection is active the server crashes and reboots. The client does not use the TCP keepalive timer. Which behaviour is possible?
Statement I: If the client is waiting to receive a packet, it may wait indefinitely.
Statement II: If the client sends a packet after the server reboots, it will receive a FIN segment.

ABoth Statement I and Statement II are true BBoth Statement I and Statement II are false CStatement I is true but Statement II is false DStatement I is false but Statement II is true

Directions (Q36–40): A 3000 km long trunk operates at 1.536 Mbps and is used to transmit 64-byte frames using a sliding window protocol. The propagation delay is 6 μs/km.

Q14. The minimum number of bits required in the sequence number field of the packet is

A6 bits B7 bits C5 bits D4 bits

Directions (Q36–40): A 3000 km long trunk operates at 1.536 Mbps and is used to transmit 64-byte frames using a sliding window protocol. The propagation delay is 6 μs/km.

Q15. The sender window size to get the maximum efficiency is

A108 B109 C55 D56

Directions (Q36–40): A 3000 km long trunk operates at 1.536 Mbps and is used to transmit 64-byte frames using a sliding window protocol. The propagation delay is 6 μs/km.

Q16. If only 6 bits are reserved for the sequence number field, the efficiency of the system is

A0.587 B0.875 C0.578 D0.50

Next: Mock 8 – Transport Layer: TCP & UDP (Part 2) →