Recent questions and answers in Computer Networks - GATE CSE Doubts

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Madeeasy Testseries CN Q4
Here why can’t the answer be p1(1-b1)^L (1-p2)(1-p3) + (1-p1)(p2)(1-b2)^L(1-p3) + (1-p1)(1-p2)(p3)(1-b3)^L ?

answered 6 days ago in Computer Networks by Abhisheksmile94 (193 points) | 22 views

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Madeeasy Test series CN Q3
Which of the following is a valid multicast MAC Address ? 01:00:5E:00:00:00 01:00:5E:00:00:FF 01:00:5E:00:FF:FF 01:00:5E:FF:FF:FF

asked 6 days ago in Computer Networks by Shivateja MST (45 points) | 7 views

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Madeeasy Test series CN Q2
Which of the following is/are correct regarding IPV4 Datagram Header? The minimum length of HLEN field is 5 and maximum is 20. Total length field has a minimum value of 20 Bytes and maximum of 65516 Bytes Fragmentation offset maximum value is 65514 Bytes. None of the above

answered 6 days ago in Computer Networks by Abhisheksmile94 (193 points) | 47 views

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Computer network (self doubt)
In datagrams fragmentation occurs at routers. What about in virtual circuits? As CPU bandwidth and buffers are reserved, is there a chance for fragmentation to occur in router?

asked Jan 9 in Computer Networks by Kishore7 (5 points) | 8 views

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Applied Gate Test Series Computer Network

answered Jan 9 in Computer Networks by Sahil91 (645 points) | 46 views

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Ace test series

asked Jan 2 in Computer Networks by val_pro20 (2 points) | 22 views

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#self-doubt #computer-networks
dhcp works at which layer?[ network layer or application layer] arp works at which layer?[data link layer or network layer]

answered Dec 29, 2020 in Computer Networks by wander (287 points) | 16 views

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#made-easy #computer-networks
consider the following figure of connection release.what will be B values ,if A is 21? in ans it is given 52.but it should be 51 bcz in connection release server sends FIN+ACK packet but ack packet does not consume any sequence number.Am i correct? [closed]

asked Dec 29, 2020 in Computer Networks by 404 found (31 points) | 14 views

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An IPv4 Packet in Hexadecimal digits.
Following is the Packet : 0 x 4 6 0 0 0 0 2 8 0 1 0 1 2 0 5 0 0 1 0 6 0 0 0 0 my question is that what is the size of options and how many bytes of data is being carried by this packet and what is the identification number of datagram fragment?

answered Dec 29, 2020 in Computer Networks by wander (287 points) | 28 views

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Made easy: IP data field can contain which of these?

asked Dec 29, 2020 in Computer Networks by ytheuyr (7 points) | 16 views

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Applied Course test
An organisation have the network address as 129.50.0.0. The organisation wants to maximize the hosts and also wants 8 subnets for the organisation. To get the maximum hosts and 8 subnets what will be the subnet mask number.

answered Dec 29, 2020 in Computer Networks by saurabh111 (11 points) | 14 views

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GATE2006-IT-65 Video Solution
In the $4B/5B$ encoding scheme, every $4$ bits of data are encoded in a $5$-bit codeword. It is required that the codewords have at most $1$ leading and at most $1$ trailing zero. How many are such codewords possible? $14$ $16$ $18$ $20$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 10 views

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GATE2007-IT-61 Video Solution
In the waveform (a) given below, a bit stream is encoded by Manchester encoding scheme. The same bit stream is encoded in a different coding scheme in wave form (b). The bit stream and the ... Manchester respectively $0111101000$ and Differential Manchester respectively $1000010111$ and Integral Manchester respectively $0111101000$ and Integral Manchester respectively

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 31 views

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GATE2004-IT-45 Video Solution
A serial transmission $T1$ uses $8$ information bits, $2$ start bits, $1$ stop bit and $1$ parity bit for each character. A synchronous transmission $T2$ uses $3$ eight-bit sync characters followed by $30$ eight-bit information characters. If ... $136$ characters/sec $100$ characters/sec, $136$ characters/sec $80$ characters/sec, $153$ characters/sec

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 9 views

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GATE2008-IT-18 Video Solution
How many bytes of data can be sent in $15$ seconds over a serial link with baud rate of $9600$ in asynchronous mode with odd parity and two stop bits in the frame? $10,000$ bytes $12,000$ bytes $15,000$ bytes $27,000$ bytes

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 6 views

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GATE2004-22 Video Solution
How many $8-bi$t characters can be transmitted per second over a $9600$ baud serial communication link using asynchronous mode of transmission with one start bit, eight data bits, two stop bits and one parity bit? $600$ $800$ $876$ $1200$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 14 views

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GATE2015-3-36 Video Solution
Two hosts are connected via a packet switch with $10^7$ bits per second links. Each link has a propagation delay of $20$ microseconds. The switch begins forwarding a packet $35$ microseconds after it receives the same. If $10000$ bits of data ... between the transmission of the first bit of data and the reception of the last bit of the data in microseconds is ______.

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 15 views

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GATE2007-IT-62 Video Solution
Let us consider a statistical time division multiplexing of packets. The number of sources is $10$. In a time unit, a source transmits a packet of $1000$ bits. The number of sources sending data for the first $20$ ... unit. Then the average number of backlogged of packets per time unit during the given period is $5$ $4.45$ $3.45$ $0$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 12 views

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GATE2008-IT-66 Video Solution
Data transmitted on a link uses the following $2D$ parity scheme for error detection: Each sequence of $28$ bits is arranged in a $4\times 7$ matrix (rows $r_0$ through $r_3$, and columns $d_7$ through $d_1$) and is padded with a column $d_0$ ... received by a receiver and has $n$ corrupted bits. What is the minimum possible value of $n$? $1$ $2$ $3$ $4$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 10 views

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GATE2005-IT-78 Video Solution
Consider the following message $M = 1010001101$. The cyclic redundancy check (CRC) for this message using the divisor polynomial $x^5+x^4+x^2+1$ is : $01110$ $01011$ $10101$ $10110$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 14 views

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GATE2007-68, ISRO2016-73 Video Solution
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: $11001001000$ $11001001011$ $11001010$ $110010010011$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 11 views

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GATE2006-IT-68 Video Solution
On a wireless link, the probability of packet error is $0.2$. A stop-and-wait protocol is used to transfer data across the link. The channel condition is assumed to be independent of transmission to transmission. What is the average number of transmission attempts required to transfer $100$ packets? $100$ $125$ $150$ $200$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 4 views

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GATE2015-1-53 Video Solution
Suppose that the stop-and-wait protocol is used on a link with a bit rate of $64$ $\text{kilobits}$ per second and $20$ $\text{milliseconds}$ propagation delay. Assume that the transmission time for the acknowledgment and the processing time ... . Then the minimum frame size in bytes to achieve a link utilization of at least $50$ $\text{%}$ is_________________.

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 9 views

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GATE2005-IT-72 Video Solution
A channel has a bit rate of $4$ $kbps$ and one-way propagation delay of $20$ $ms$. The channel uses stop and wait protocol. The transmission time of the acknowledgment frame is negligible. To get a channel efficiency of at least $50$\text{%}$, the minimum frame size should be $80$ $\text{bytes}$ $80$ $\text{bits}$ $160$ $\text{bytes}$ $160$ $\text{bits}$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 9 views

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GATE2015-2-8 Video Solution
A link has transmission speed of $10^6$ bits/sec. It uses data packets of size $1000$ $\text{bytes}$ each. Assume that the acknowledgment has negligible transmission delay and that its propagation delay is the same as the data propagation delay. Also ... $\text{%}$. The value of the one way propagation delay (in milliseconds) is_____.

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 10 views

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GATE2016-1-55 Video Solution
A sender uses the Stop-and-Wait ARQ protocol for reliable transmission of frames. Frames are of size $1000$ bytes and the transmission rate at the sender is $80$ Kbps (1 Kbps = 1000 bits/second). Size of an acknowledgment is $100$ bytes ... . The one-way propagation delay is $100$ milliseconds. Assuming no frame is lost, the sender throughput is ________ bytes/ second.

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 11 views

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GATE2017-1-45 Video Solution
The values of parameters for the Stop-and-Wait ARQ protocol are as given below: Bit rate of the transmission channel = $1$ Mbps. Propagation delay from sender to receiver = $0.75$ ms. Time to process a frame = $0.25$ ms. Number of ... (expressed in percentage) of the Stop-and-Wait ARQ protocol for the above parameters is _____________ (correct to $2$ decimal places).

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 15 views

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GATE2003-84 Video Solution
Host $A$ is sending data to host $B$ over a full duplex link. $A$ and $B$ are using the sliding window protocol for flow control. The send and receive window sizes are $5$ packets each. Data packets (sent only from $A$ to $B$) are all $1000$ bytes long and the transmission ... ? $7.69 \times 10^6$ Bps $11.11 \times 10^6$ Bps $12.33 \times 10^6$ Bps $15.00 \times 10^6$ Bps

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 10 views

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GATE2006-44 Video Solution
Station $A$ uses $32$ $\text{byte}$ packets to transmit messages to Station $B$ using a sliding window protocol. The round trip delay between A and $B$ is $80$ $\text{milliseconds}$ and the bottleneck bandwidth on the path between $A$ and $B$ is $128$ $\text{kbps}$ . What is the optimal window size that $A$ should use? $20$ $40$ $160$ $320$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 9 views

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GATE2007-69 Video Solution
The distance between two stations $M$ and $N$ is $L$ kilometers. All frames are $K$ bits long. The propagation delay per kilometer is $t$ seconds. Let $R$ bits/second be the channel capacity. Assuming that the processing delay is negligible, the $\text{minimum}$ number ... $\lceil \log_2 \frac{2LtR +K}{K} \rceil$ $\lceil \log_2 \frac{2LtR +2K}{2K} \rceil$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 9 views

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GATE2004-IT-81 Video Solution
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 $min (M, N)$ $max (M, N)$ $M + N$ $MN$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 6 views

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GATE2004-IT-83 Video Solution
A $20$ $\text{Kbps}$ satellite link has a propagation delay of $400$ $\text{ms}$. The transmitter employs the "go back $n$ $ARQ$" scheme with $n$ set to $10$. Assuming that each frame is $100$ $\text{byte}$ long, what is the maximum data rate possible? $5$ $\text{Kbps}$ $10$ $\text{Kbps}$ $15$ $\text{Kbps}$ $20$ $\text{Kbps}$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 10 views

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GATE2008-IT-64 Video Solution
A $1$ $\text{Mbps}$ satellite link connects two ground stations. The altitude of the satellite is $36,504$ $\text{km}$ and speed of the signal is 3 108 m/s. What should be the packet size for a channel utilization of $25$ ... no errors during communication. $120$ $\text{bytes}$ $60$ $\text{bytes}$ $240$ $\text{bytes}$ $90$ $\text{bytes}$

answered Dec 24, 2020 in Computer Networks by amitkhurana512 (35 points) | 11 views

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Made Easy Test Series

asked Dec 24, 2020 in Computer Networks by Abhisheksmile94 (193 points) | 7 views

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GATE2006-46 Video Solution
Station $A$ needs to send a message consisting of $9$ packets to Station $B$ using a sliding window (window size $3$) and go-back-n error control strategy. All packets are ready and immediately available for transmission. If every 5th packet that $A$ transmits gets ... what is the number of packets that $A$ will transmit for sending the message to $B$? $12$ $14$ $16$ $18$

answered Dec 23, 2020 in Computer Networks by amitkhurana512 (35 points) | 23 views

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GATE2015-3-28 Video Solution
Consider a network connecting two systems located $8000$ $\text{Km}$ apart. The bandwidth of the network is $500 \times 10^6$ $\text{bits}$ per second. The propagation speed of the media is $4 \times 10^6$ $\text{meters}$ per second ... . Assume that processing delays at nodes are negligible. Then, the minimum size in bits of the sequence number field has to be ______.

answered Dec 23, 2020 in Computer Networks by amitkhurana512 (35 points) | 15 views

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GATE2016-2-55 Video Solution
Consider a $128 \times 10^3$ 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. ... of acknowledgement. The minimum number of bits required for the sequence number field to achieve $100 \%$ utilization is ________.

answered Dec 23, 2020 in Computer Networks by amitkhurana512 (35 points) | 13 views

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GATE2012-44 Video Solution
Consider a source computer $(S)$ transmitting a file of size $10^{6}$ bits to a destination computer $(D)$ over a network of two routers $(R_{1}\text{ and }R_{2})$ and three links $(L_{1},L_{2},\text{ and } L_{3})$. $L_{1}$ connects $S$ to ... propagation delays in transmitting the file from $S$ to $D$? $\text{1005 ms}$ $\text{1010 ms}$ $\text{3000 ms}$ $\text{3003 ms}$

answered Dec 23, 2020 in Computer Networks by amitkhurana512 (35 points) | 11 views

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GATE2007-65 Video Solution
There are $n$ stations in slotted LAN. Each station attempts to transmit with a probability $p$ in each time slot. What is the probability that ONLY one station transmits in a given time slot? $np(1-p)^{n-1}$ $(1-p)^{n-1}$ $p(1-p)^{n-1}$ $1-(1-p)^{n-1}$

answered Dec 23, 2020 in Computer Networks by amitkhurana512 (35 points) | 9 views

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GATE2015-1-29 Video Solution
Consider a LAN with four nodes $S_1, S_2, S_3,$ and $S_4$. Time is divided into fixed-size slots, and a node can begin its transmission only at the beginning of a slot. A collision is said to have occurred if more than one ... respectively. The probability of sending a frame in the first slot without any collision by any of these four stations is__________________.

answered Dec 23, 2020 in Computer Networks by amitkhurana512 (35 points) | 10 views

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