Recent questions and answers in Computer Networks - GATE CSE Doubts

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i dont know its a assignment
If the bandwidth is 100 Mbps, round trip time is 50sec and the frame size is 25 bits. Calculate (i) Window size used in selective repeat ARQ. (ii) Number of sequence bits in selective repeat ARQ.

asked 1 day ago in Computer Networks by nim_nambi (5 points) | 3 views

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MAC address and router working
I have some conceptual doubts about MAC address why we need them when we have an IP address and routers know the IP address

asked 3 days ago in Computer Networks by jainanmol123 (13 points) | 6 views

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Finding optimal window size
Finding Optimal Window Size In Slinding Window Protocol. Given Round trip time(RTT sec), Bandwidth(BW bits/sec), packet size(L bits), which approch is right? Approch 1. max data that can be sent in RTT = RTT * BW bits max window size = (RTT * BW)/L ... = (1 + 2a) packets; a=Tp/Tt Some problems are sloved with approch 1 and others with 2nd one. Which one should we use?

asked 5 days ago in Computer Networks by jaswanth431 (5 points) | 13 views

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Congestion Control
Is AIMD and slow start in congestion control are same. if not then why

asked May 4 in Computer Networks by vsumit03 (5 points) | 2 views

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Calculate the window size of Sliding Window Protocol and capacity of stop-and-wait-style ARQ

asked May 2 in Computer Networks by Himu21 (5 points) | 9 views

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Made Easy WorkBook CSE
Which of the following is a list of packet switching characteristics? (a) Bandwidth divided, translation tables for routing, destination address (b) Bandwidth shared, queues at router,different path possible (c) Bandwidth divided, store and forward, good for bursty data (d) Bandwidth shared, low transmission delay routes may change

asked Apr 25 in Computer Networks by Vandit Shah (5 points) | 12 views

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#SELF DOUBT -can a host simultaneously exist in two different network

asked Apr 17 in Computer Networks by abhijeet at (9 points) | 9 views

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Goldman Sachs Test
Consider a file of 3MB that needs to be transmitted over a 1Gbps link with RTT of 80ms, What is the effective throughput? A)36.2 Mbps B)9.26Mbps C)9.9 Mbps D)28.85 Mbps

answered Mar 2 in Computer Networks by ShivangiChauhan (17 points) | 48 views

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1 answer

Self Doubt,IP4
Maximum value of fragment offset in IP4

answered Feb 25 in Computer Networks by rapidxy (9 points) | 26 views

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Made Easy Test series
find the total number of subnets available and broadcast address is given mask is 255.255.255.224 and IP is 192.168.0.102?

asked Feb 8 in Computer Networks by arshin jain (5 points) | 16 views

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Made easy question about sliding window protocol
Options are: 8,4,6,7. This is a multiple correct question. Answer as per key is 8,6,7 Their explanation is this: My doubt: if the window size is 8, then why does the sender wait for acknowledgement after sending 3 packets? It can send more without waiting.

asked Feb 7 in Computer Networks by ytheuyr (2 points) | 27 views

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Supernetting Rules (Self Doubt)
I have read rules of supernetting from a few sources and have got conflicting information. this (3:20) , this and this say that the rules are: 1.All the Networks should be contiguous. 2.The block size of every networks should be equal ... 2 and first address being divisible by "number of blocks" in the supernet. What is going wrong? Am I missing something?

asked Feb 5 in Computer Networks by shantanu4raje (25 points) | 13 views

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Subnet Self-Doubt
If there are n bits available for subnet, how many sub-nets are possible ?

asked Feb 2 in Computer Networks by valerie21 (5 points) | 55 views

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1 answer

Pearson GATE 2021, 8.48, Q1
Current RTT=40ms. ACKs arrive at 26ms, 32ms, 24ms respectively. What is the new estimated RTT? Consider alpha=0.9

answered Feb 1 in Computer Networks by Parth27 (163 points) | 38 views

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UGC NET OCTOBER 2020
Consider a code with only four valid code words: 0000000000, 0000011111, 1111100000, and 1111111111. This code has distance 5. If the code word arrived is 0000000111 then the original code word must be ____________ 1.0000011111 2.0000000000 3.1111100000 4.11111

asked Jan 21 in Computer Networks by abhinav kumar (5 points) | 22 views

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Gradeup Test series
In the TCP connection (AIMD) algorithm, the sender sending threshold (SSThresh) is 12MSS and congestion window size (cwnd) is 1MSS. If round trip time (RTT) is 100ms then what amount of time is required to start the congestion avoidance phase? (Assume no timeout occur at the sender side) 300ms 400ms 700ms 800ms

asked Jan 20 in Computer Networks by Gautam9596 (5 points) | 20 views

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1 answer

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 Jan 11 in Computer Networks by Abhisheksmile94 (347 points) | 30 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 Jan 10 in Computer Networks by Shivateja MST (45 points) | 15 views

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1 answer

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 Jan 10 in Computer Networks by Abhisheksmile94 (347 points) | 68 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) | 13 views

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1 answer

Applied Gate Test Series Computer Network

answered Jan 9 in Computer Networks by Sahil91 (683 points) | 73 views

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Ace test series

asked Jan 2 in Computer Networks by val_pro20 (2 points) | 35 views

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1 answer

#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 (301 points) | 18 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 (37 points) | 17 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 (301 points) | 32 views

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

asked Dec 29, 2020 in Computer Networks by ytheuyr (2 points) | 18 views

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1 answer

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) | 17 views

+1 vote

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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 (47 points) | 13 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 (47 points) | 61 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 (47 points) | 12 views

+1 vote

1 answer

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 (47 points) | 9 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 (47 points) | 20 views

+1 vote

1 answer

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 (47 points) | 19 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 (47 points) | 18 views

+1 vote

1 answer

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 (47 points) | 14 views

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1 answer

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 (47 points) | 16 views

+1 vote

1 answer

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 (47 points) | 19 views

+1 vote

1 answer

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 (47 points) | 11 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 (47 points) | 14 views

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1 answer

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 (47 points) | 15 views

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