Paper 2 CS · UNIT 09 · MOCK TEST

Mock 3 – Data Link Layer, MAC & Error Control

Unit 9: Data Communication and Computer Networks · 27 questions · about 32 minutes. Press End Mock any time to see your score and the correct answers.

All 13 topic-wise mocks in this unit

0 / 27 answered 00:00

Q1. Match the LIST-I with LIST-II

LIST-I	LIST-II
A. Data link layer	I. Encryption
B. Network layer	II. Connection Control
C. Transport layer	III. Routing
D. Presentation layer	IV. Framing

Choose the correct answer from the options given below:

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

Q2. Choose the right sequence of stages for data transmission using CSMA/CD.
A. If the channel is clear, the sender sends the data.
B. The sender senses the channel for activity.
C. The sender waits for a random back off time before retransmitting.
D. Collision detection occurs if two devices transmit at the same time.
Choose the correct answer from the options given below :

AA, B, D, C BB, A, D, C CB, A, C, D DC, B, A, D

Q3. Which of the following are controlled-access protocols?
A. Reservation
B. Polling
C. TDMA
D. Token Passing
E. CSMA/CA
Choose the correct answer from the options given below:

AA and D Only BA, B and D Only CC, D and E Only DA, D and E Only

Q4. Consider the following statements regarding multiple access techniques & identify the CORRECT ones.
A. ALOHA is used for multiple access on a shared medium
B. TDMA uses WALSH TABLES for time slot allocation
C. CSMA/CD was invented for wireless networks
D. CDMA codes are sequences of numbers generated by orthogonal codes
Choose the correct answer from the options given below:

AA & B only BB & C only CC & D only DA & D only

Q5. The Hamming distance between 10101 and 11110 is

A2 B3 C4 D5

Q6. In a token ring network the transmission speed is 10⁷ bps and the propagation speed is 200 m/μs. The 1-bit delay in this network is equivalent to

A20 m B30 m C50 m D40 m

Q7. In bit stuffing, each frame begins and ends with which bit pattern (in hexadecimal)?

A0x8C B0x6F C0xFF D0x7E

Q8. Which of the following are examples of CSMA channel-sensing (persistence) methods?
(A) 1-persistent
(B) 2-persistent
(C) p-persistent
(D) non-persistent
Choose the correct answer from the options given below:

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

Q9. In standard Ethernet with a transmission rate of 10 Mbps, the length of the medium is 2500 m and the frame size is 512 bits. The propagation speed of a signal in the cable is 2 × 10⁸ m/s. The transmission delay and propagation delay are

A25.25 μs and 51.2 μs B51.2 μs and 12.5 μs C10.24 μs and 50.12 μs D12.5 μs and 51.2 μs

Q10. Match List I with List II

List I	List II
A. Channelization protocol	I. ALOHA
B. Bit-oriented protocol	II. TDMA
C. Random-access protocol	III. Reservation
D. Controlled-access protocol	IV. HDLC

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

Q11. In CRC coding, the data word is 111111, the divisor is 1010 and the remainder is 110. Which of the following is the codeword?

A011111101 B001010110 C111111110 D110111111

Q12. In the Go-Back-N protocol, Sf (first outstanding packet) = 3 and Sn (next packet to send) = 7. After receiving the packet with AckNo = 6, the value of Sn is ______

A6 B7 C5 D4

Q13. What is the minimum Hamming distance in a block code if we want to be able to detect up to S errors?

AS BS + 1 C1 D0

Q14. Given the Ethernet address
010110100001000101010101000110001010101000001111
in binary, what is the address in hexadecimal notation?

A5A:88:AA:18:55:F0 B5A:81:BA:81:AA:08 C5A:18:5A:18:55:0F D5A:11:55:18:AA:0F

Q15. In CRC coding, if the data word is 111111, the divisor is 1010 and the remainder is 110, which of the following codewords is true?

A011111101 B001010110 C111111110 D110111111

Q16. Match List I with List II.
Choose the correct answer from the options given below:

List I	List II
A. Physical layer	I. Routing of the signals, divide the outgoing message into packets, act as network controller for routing data
B. Data link layer	II. Make and break connections, define voltages and data rates, convert data bits into electrical signal
C. Network layer	III. Synchronization, error detection and correction, assemble outgoing message into frames
D. Presentation layer	IV. It works as a translating layer

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

Q17.

Which of the following are controlled-access protocols

A. Reservation

B. Polling

C. TDMA

D. Token Passing

E. CSMA/CA

AA and D Only BA, B and D Only CC, D and E Only DA, D and E Only

Q18.

Match List - I with List - II.

A(A)-(I), (B)-(II), (C)-(III), (D)-(IV) B(A)-(II), (B)-(IV), (C)-(III), (D)-(I) C(A)-(III), (B)-(II), (C)-(IV), (D)-(I) D(A)-(I), (B)-(IV), (C)-(III), (D)-(II)

Q19.

Match List I with List II. List I: A. Channelization protocol, B. Bit-oriented protocol, C. Random-access protocol, D. Controlled-access protocol. List II: I. ALOHA, II. TDMA, III. Reservation, IV. HDLC.

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

Q20.

Which of the following are examples of CSMA channel sensing methods?

(A) 1-persistent

(B) 2-persistent

(D) o-persistent

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

Q21.

In CRC coding if the data word is 111111 , divisor is 1010 and the remainder is 110 . Which of the following code is true?

A011111101 B001010110 C111111110 D110111111 S

Q22.

In Go-back-N protocol, the values of f (Send = 3, S window, the first outstanding packet) n (Send window, the next packet to be send) =7, after receiving the packet with AckNo.6, the S value of n is _____

A6 B7 C5 D4

Q23.

Match List I with List II. List I: (A) Physical layer, (B) Data link layer, (C) Network layer, (D) Presentation layer. List II: (I) Routing of signals, dividing outgoing messages into packets, acting as network controller, (II) Making and breaking connections, defining voltages and data rates, converting bits into electrical signals, (III) Synchronization, error detection and correction, assembling outgoing messages into frames, (IV) Works as a translating layer.

A(A)-(IV), (B)-(III), (C)-(II), (D)-(I) B(A)-(II), (B)-(III), (C)-(IV), (D)-(I) C(A)-(IV), (B)-(III), (C)-(I), (D)-(II) D(A)-(II), (B)-(III), (C)-(I), (D)-(IV)

Q24.

Which statements are true? A. X.25 is a connection-oriented network. B. X.25 doesn't support switched virtual circuits. C. Frame relay provides acknowledgements. D. Frame relay provides detection of transmission errors.

AA and D only BB and D only CC and D only DB and C only G(x)

Q25.

Let G(x) be the generator polynomial used for CRC checking. The condition G(x) must satisfy to catch all errors consisting of an odd number of inverted bits is

A(x + 1) is a factor of G(x) B(x − 1) is a factor of G(x) C(x² + 1) is a factor of G(x) D(1 − x²) is a factor of G(x)

Q26.

A host is connected to a department network which is part of a university network. The university network, in turn, is part of the Internet. The largest network, in which the Ethernet address of the host is unique, is

Athe Internet Bthe university network Cthe department network Dthe subnet to which the host belongs

Q27.

To guarantee correction of up to t errors, the minimum Hamming distance d in a block code min must be ________.

At+1 Bt−2 C2t−1 D2t+1

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