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transmitted using the CRC polynomial
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The message 11001001 is to be transmitted using the CRC polynomial x^3 + 1 to protect it from errors. The message that should be transmitted is:
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generator polynomial used for CRC checking detect odd number of bits in error
Let G(x) be the generator polynomial used for CRC checking. What is the condition that should be satisfied by G(x) to detect odd number of bits in error? A G(x) contains more than two terms B G(x) does not divide 1+x^k, for any k not exceeding the frame length C 1+x is a factor of G(x) D G(x) has an odd number of terms.
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Flow and error control techniques, switching
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gate
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maximum window size for data transmission using the selective reject protocol
The maximum window size for data transmission using the selective reject protocol with nbit frame sequence numbers is:
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Flow and error control techniques, switching
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gate
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f (x) be a polynomial and g(x) = f (x) be its derivative. If the degree
Let f (x) be a polynomial and g(x) = f (x) be its derivative. If the degree of (f(x) + f(−x)) is 10, then the degree of (g(x) − g(−x)) is _______________
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Linear Algebra
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gate
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sliding window ARQ scheme, the transmitter's window size is N and the receiver's window size is M. The minimum number of distinct sequence numbers required to ensure correct operation of the ARQ scheme
In a sliding window ARQ scheme, the transmitter's window size is N and the receiver's window size is M. The minimum number of distinct sequence numbers required to ensure correct operation of the ARQ scheme is A min (M, N) B max (M, N) C M + N D MN
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Flow and error control techniques, switching
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gate
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satellite communication link minimum number of bits required for the sequence number field to achieve 100% utilization
Consider a 128×10 3 bits/second satellite communication link with one way propagation delay of 150 milliseconds. Selective retransmission (repeat) protocol is used on this link to send data with a frame size of 1 kilobyte. Neglect the transmission time of acknowledgement. The minimum number of bits required for the sequence number field to achieve 100% utilization is ___________
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Flow and error control techniques, switching
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gate
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sliding window protocol minimum time the sender will have to wait before starting transmission of the next frame
Consider the data of previous question. Suppose that the sliding window protocol is used with the sender window size of 2^i where is the number of bits identified in the previous question and acknowledgments are always piggybacked. After sending 2^i frames, what is the minimum time the sender will have to wait before starting transmission of the next frame? (Identify the closest choice ignoring the frame processing time.)
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Flow and error control techniques, switching
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What are the advantages of using pointers?
Pointers are special variables which store address of some other variables. Syntax: datatype *ptr; Here * indicates that ptr is a pointer variable which represents value stored at a particular address. Example: int *p; 'p' is a pointer variable pointing to address location where an integer type is stored. Advantages: 1. Pointers allow us to pass values to functions using call by reference. This is useful when large sized arrays are passed as arguments to functions. A function can return more ... . For instance, if an array's memory is fixed, it cannot be resized. But in case of an array whose memory is created out of malloc can be resized. 4. Pointers point to physical memory and allow quicker access to data.
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Programming
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cube is built using 64 cubic blocks of side one unit. After it is built, one cubic block is removed from every corner of the cube. The resulting surface area of the body (in square units) after the removal
A cube is built using 64 cubic blocks of side one unit. After it is built, one cubic block is removed from every corner of the cube. The resulting surface area of the body (in square units) after the removal is __________.
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aptitude questions
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aptitude
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join (relation algebra) between relations r(R)and s(S) using the nested loop method
Consider a join (relation algebra) between relations r(R)and s(S) using the nested loop method. There are 3 buffers each of size equal to disk block size, out of which one buffer is reserved for intermediate results. Assuming size(r(R)) < size(s(S)), the join will have fewer number of disk block accesses if A relation r(R) is in the outer loop. B relation s(S) is in the outer loop. C join selection factor between r(R) and s(S) is more than 0.5. D join selection factor between r(R) and s(S) is less than 0.5.
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Relational model: relational algebra, tuple calculus, SQL
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tightest upper bound on the running time on Depth First Search DFS using adjacency matrix
Let G be a graph with n vertices and m edges. What is the tightest upper bound on the running time on Depth First Search of G? Assume that the graph is represented using adjacency matrix.
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graphs
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gate
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Related questions
generator polynomial used for CRC checking detect odd number of bits in error
maximum window size for data transmission using the selective reject protocol
f (x) be a polynomial and g(x) = f (x) be its derivative. If the degree
sliding window ARQ scheme, the transmitter's window size is N and the receiver's window size is M. The minimum number of distinct sequence numbers required to ensure correct operation of the ARQ scheme
satellite communication link minimum number of bits required for the sequence number field to achieve 100% utilization
sliding window protocol minimum time the sender will have to wait before starting transmission of the next frame
What are the advantages of using pointers?
cube is built using 64 cubic blocks of side one unit. After it is built, one cubic block is removed from every corner of the cube. The resulting surface area of the body (in square units) after the removal
join (relation algebra) between relations r(R)and s(S) using the nested loop method
tightest upper bound on the running time on Depth First Search DFS using adjacency matrix