Recent questions tagged computer-networks - GATE CSE Doubts

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Finding Subnetmasks
Given a direct broadcast address find, subnet masks. DBA: 200.1.15.255

asked 2 hours ago in Computer Networks by Ankit Kabi (9 points) | 8 views

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CSMA CD question
Question Source is Made easy test series Consider a CSMA CD with frame size 20KB and Transmission rate to be 10Kbps, what is the maximum length of the cable (km) if signal speed is 15kmps

asked 1 day ago in Computer Networks by shashankrustagi2021 (12 points) | 14 views

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Data Communications and Networking 5E by Forouzan, Chapter 10

asked 2 days ago in Computer Networks by Joyoshish Saha (6 points) | 6 views

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Self Doubt (Hamming Codes)
Why do we consider $2^r \ge m+r+1$ for hamming codes where $r$ = number of parity bits and $m$ = number of message bits ?

asked 5 days ago in Computer Networks by Mellophi (159 points) | 7 views

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Use of Routing Table
From what I've understood, your ISP provides you an IP address and a subnet mask. The router can just bitwise AND' on that IP address and subnet mask to get the network ID(1). So when we want to send a data to a different IP address, it just ... in a different network, it just hops the data to the nearest router. So my question is, now where does the routing table comes place?

asked Jul 27 in Computer Networks by vigneshwar221b (6 points) | 9 views

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TCP Timeout Timer Management
I know that, if the timeout is set too short, unnecessary retransmissions will occur. Suppose, we send a segment with sequence number = 100 and segment length = 100. This segment is received by the the receiver and the receiver sends a ... sender accept the delayed ACK? Will the receiver discard the duplicate segment? Does Karn's Algorithm take care of this problem?

asked Jul 27 in Computer Networks by arjungangwar (6 points) | 6 views

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GBN protocol made easy
sender window = 01234, receiver window= 23456 sender window = 23456, receiver window= 23456 sender window = 23456, receiver window= 01234 sender window = 01234, receiver window= 01234

asked Jul 21 in Computer Networks by abcd9982 (54 points) | 8 views

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wifi networks made easy

asked Jul 21 in Computer Networks by abcd9982 (54 points) | 8 views

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ISRO2016-80 self doubt, DNS Spoofing vs DNS Hijacking

asked Jul 9 in Computer Networks by Ollie (8 points) | 12 views

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Computer Networks A top down approach by forouzan
a. A non-ASCII message of 1000 bytes is encoded using base64. How many bytes are in the encoded message? How many bytes are redundant? What is the ratio of redundant bytes to the total message? b. A message of 1000 bytes ... two previous cases. How much has the efficiency improved if the message is a combination of ASCII and non-ASCII characters?

asked Jul 5 in Computer Networks by rits78671 (6 points) | 10 views

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GATE SYLLABUS DOUBT
Is the following topics in GATE syllabus of computer networks? Token passing ( delayed token reinsertion, early token reinsertion) Token Ring Token Bus

asked Jun 20 in Computer Networks by Subham Das (6 points) | 29 views

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#CN Supernetting Self doubt
Given a block of 16 ip address as below - 200.1.32.0/24 200.1.33.0/24 200.1.34.0/24 200.1.35.0/24 200.1.36.0/24 200.1.37.0/24 200.1.38.0/24 200.1.39.0/24 200.1.40.0/24 200.1.41.0/24 200.1.42.0/24 200.1.43.0/24 200.1 ... .0/24 200.1.46.0/24 200.1.47.0/24 Please tell how to calculate or what will be the network address/Supernet ID and what is the Supernet Mask.? Thank you!

asked Jun 16 in Computer Networks by iarnav (93 points) | 10 views

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Behrouz A Forouzan, Data Communications and Networking,

asked Apr 28 in Computer Networks by Hitesh001 (6 points) | 11 views

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GATE2009-57, ISRO2016-75 Video Solution
Frames of $\text{1000 bits}$ are sent over a $10^6$ $\text{bps}$ duplex link between two hosts. The propagation time is $\text{25 ms}$. Frames are to be transmitted into this link to maximally pack them in transit (within the link). What is the ... ? Assume that no time gap needs to be given between transmission of two frames. $I=2$ $I=3$ $I=4$ $I=5$

asked Apr 18 in Computer Networks by admin (3.6k points) | 6 views

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GATE2016-1-54 Video Solution
For a host machine that uses the token bucket algorithm for congestion control, the token bucket has a capacity of $1$ $\text{megabyte}$ and the maximum output rate is $20$ $\text{megabytes}$ per $\text{second}$. Tokens arrive at a rate to ... to send $12$ $\text{megabytes}$ of data. The minimum time required to transmit the data is _____________ $\text{seconds}$.

asked Apr 18 in Computer Networks by admin (3.6k points) | 7 views

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GATE2012-45 Video Solution
Consider an instance of TCP's Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of the slow start phase is $2$ MSS and the threshold at the start of the first transmission is $8$ MSS. Assume that a timeout occurs during ... . Find the congestion window size at the end of the tenth transmission. $8$ MSS $14$ MSS $7$ MSS $12$ MSS

asked Apr 18 in Computer Networks by admin (3.6k points) | 7 views

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GATE2014-1-27 Video Solution
Let the size of congestion window of a TCP connection be $32$ KB when a timeout occurs. The round trip time of the connection is $100$ msec and the maximum segment size used is $2$ KB. The time taken (in msec) by the TCP connection to get back to $32$ KB congestion window is _________.

asked Apr 18 in Computer Networks by admin (3.6k points) | 1 view

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GATE2007-67, ISRO2016-72 Video Solution
The address of a class $B$ host is to be split into subnets with a $6$-$bit$ subnet number. What is the maximum number of subnets and the maximum number of hosts in each subnet? $62$ subnets and $262142$ hosts. $64$ subnets and $262142$ hosts. $62$ subnets and $1022$ hosts. $64$ subnets and $1024$ hosts.

asked Apr 18 in Computer Networks by admin (3.6k points) | 4 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 ______.

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2005-74 Video Solution
Suppose the round trip propagation delay for a $10\text{ Mbps}$ Ethernet having $48\text{-bit}$ jamming signal is $46.4\ \mu s$. The minimum frame size is: $94$ $416$ $464$ $512$

asked Apr 18 in Computer Networks by admin (3.6k points) | 5 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).

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2015-2-34 Video Solution
Assume that the bandwidth for a $TCP$ connection is $1048560$ bits/sec. Let $\alpha$ be the value of RTT in milliseconds (rounded off to the nearest integer) after which the $TCP$ window scale option is needed. Let $\beta$ be the maximum possible window size with ... $500$ milliseconds, $65535$ $\times $2$^{14}$ $500$ milliseconds, $65535$ $\times $2$^{16}$

asked Apr 18 in Computer Networks by admin (3.6k points) | 4 views

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GATE2005-73 Video Solution
In a packet switching network, packets are routed from source to destination along a single path having two intermediate nodes. If the message size is $24$ bytes and each packet contains a header of $3$ bytes, then the optimum packet size is: $4$ $6$ $7$ $9$

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2009-58 Video Solution
Frames of $1000\text{ bits}$ are sent over a $10^6$ bps duplex link between two hosts. The propagation time is $25ms$. Frames are to be transmitted into this link to maximally pack them in transit (within the link). Let $I$ be ... before starting transmission of the next frame? (Identify the closest choice ignoring the frame processing time) $16ms$ $18ms$ $20ms$ $22ms$

asked Apr 18 in Computer Networks by admin (3.6k points) | 5 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 $B$? $12$ $14$ $16$ $18$

asked Apr 18 in Computer Networks by admin (3.6k points) | 5 views

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GATE2014-1-28 Video Solution
Consider a selective repeat sliding window protocol that uses a frame size of $1$ $\text{KB}$ to send data on a $1.5$ $\text{Mbps}$ link with a one-way latency of $50$ $\text{msec}$. To achieve a link utilization of $60\%$, the minimum number of bits required to represent the sequence number field is ________.

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 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

asked Apr 18 in Computer Networks by admin (3.6k points) | 2 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? $20$ $40$ $160$ $320$

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2009-47 Video Solution
While opening a $TCP$ connection, the initial sequence number is to be derived using a time-of-day (ToD) clock that keeps running even when the host is down. The low order $32$ bits of the counter of the ToD clock is to be used for the initial sequence numbers ... which sequence numbers used for packets of a connection can increase? $0.015$/s $0.064$/s $0.135$/s $0.327$/s

asked Apr 18 in Computer Networks by admin (3.6k points) | 2 views

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GATE2003-82, ISRO2009-1 Video Solution
The subnet mask for a particular network is $255.255.31.0.$ Which of the following pairs of $\text{IP}$ addresses could belong to this network? $172.57.88.62$ and $172.56.87.23$ $10.35.28.2$ and $10.35.29.4$ $191.203.31.87$ and $191.234.31.88$ $128.8.129.43$ and $128.8.161.55$

asked Apr 18 in Computer Networks by admin (3.6k points) | 2 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. $120$ $\text{bytes}$ $60$ $\text{bytes}$ $240$ $\text{bytes}$ $90$ $\text{bytes}$

asked Apr 18 in Computer Networks by admin (3.6k points) | 2 views

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GATE2017-1-44 Video Solution
In a RSA cryptosystem, a participant $A$ uses two prime numbers $p = 13$ and $q = 17$ to generate her public and private keys. If the public key of $A$ is $35$, then the private key of $A$ is __________ .

asked Apr 18 in Computer Networks by admin (3.6k 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_________________.

asked Apr 18 in Computer Networks by admin (3.6k points) | 4 views

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GATE2009-48 Video Solution
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? $G(x)$ contains more than two terms $G(x)$ does not divide $1+x^k$, for any $k$ not exceeding the frame length $1+x$ is a factor of $G(x)$ $G(x)$ has an odd number of terms.

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2005-IT-73 Video Solution
On a TCP connection, current congestion window size is Congestion Window = $4$ KB. The window size advertised by the receiver is Advertise Window = $6$ KB. The last byte sent by the sender is LastByteSent = $10240$ and the last byte acknowledged by ... LastByteAcked = $8192$. The current window size at the sender is: $2048$ bytes $4096$ bytes $6144$ bytes $8192$ bytes

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2004-56 Video Solution
Consider three IP networks $A, B$ and $C$. Host $H_A$ in network $A$ sends messages each containing $180$ bytes of application data to a host $H_C$ in network $C$. The $\text{TCP}$ layer prefixes $20$ byte header to the message. This passes ... $IP$ layer at the destination for one application message, in the best case? Consider only data packets. $200$ $220$ $240$ $260$

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 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.

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2015-2-52 Video Solution
$\text{Host A}$ sends a $\text{UDP}$ datagram containing $8880\text{ bytes}$ of user data to $\text{host B}$ over an $\text{Ethernet LAN}.$ Ethernet frames may carry data up to $1500\text{ bytes (i.e. MTU = 1500 bytes)}.$ Size of $\text{UDP}$ header ... will be the contents of offset field in the last fragment? $6$ and $925$ $6$ and $7400$ $7$ and $1110$ $7$ and $8880$

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2012-34, ISRO-DEC2017-32 Video Solution
An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: $245.248.128.0/20$. The ISP wants to give half of this chunk of addresses to Organization $A$, and a quarter to Organization $B$, while retaining the remaining ... $245.248.136.0/24 \text{ and } 245.248.132.0/21$

asked Apr 18 in Computer Networks by admin (3.6k points) | 3 views

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GATE2004-IT-88 Video Solution
Suppose that the maximum transmit window size for a TCP connection is $12000$ $\text{bytes}$. Each packet consists of $2000$ $\text{bytes}$. At some point in time, the connection is in slow-start phase with a current transmit window of $4000$ $\text{bytes}$. ... transmit window? $4000$ $\text{bytes}$ $8000$ $\text{bytes}$ $10000$ $\text{bytes}$ $12000$ $\text{bytes}$

asked Apr 18 in Computer Networks by admin (3.6k points) | 6 views

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