Recent questions and answers in Computer Networks - GATE CSE Doubts

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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) | 23 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 (85 points) | 7 views

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Why congestion control is required in transport layer again, as network layer can take care of it?

asked Jun 13 in Computer Networks by mcu42 (6 points) | 3 views

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longest prefix match
Can anyone help to understand why does router uses longest prefix technique when there is a multiple match for a received packet ? why does it choose the one having largest no of 1s?

asked Jun 6 in Computer Networks by s_dr_13 (17 points) | 4 views

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CN_ Ace Quesn
Which attribute in DNS Resource record is used to deal with DNS cache issues at clients ? MX TTL CNAME A Anyone please clarify.

asked Jun 5 in Computer Networks by Shivateja MST (127 points) | 3 views

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computer networks
For a class C network if Ip address of a computer is 200.99.39.112 and subnet mask is 255.255.255.224 the decimal value of lost octet of lost host of sixth subnet is ________?

asked Jun 4 in Computer Networks by Taraka (6 points) | 5 views

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#Self Doubt - How many ip addresses are wasted on subnetting on a network?

asked Jun 4 in Computer Networks by iarnav (85 points) | 5 views

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#SelfDoubt#ComputerNetworks
Is it possible to communicate with multiple peers simulataneously with a single connect TCP Socket??

asked May 30 in Computer Networks by Jithendra319 (7 points) | 9 views

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JNU PHD CS 2019 SHIFT 2 SET 1 QUESTION 1
An upper-layer packet is split into 10 frames, each of which has an 80 percent chance of arriving undamaged. If no error control is done by the data link protocol, how many times must the message be sent on average to get the entire thing through (in transmissions)? (a) 18.6 (b) 27.9 (c) 9.3 (d) None of the above

asked May 29 in Computer Networks by Mohit Kumar 6 (12 points) | 15 views

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Self doubt in congestion control in computer networks

answered May 13 in Computer Networks by abhishek tiwary (18 points) | 14 views

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transport layer
in tcp bandwidth of the link is 50mbps,life period of packet is 54 sec ,then number of bits required in bit sequence number field to avoid overlapping of sequence number?

asked May 12 in Computer Networks by sadiya yasmeen (6 points) | 9 views

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#TESTBOOK TEST SERIES
Consider a TCP connection using the multiplicative decrement algorithm where the window size at the start of the slow start phase is 4 MSS and the threshold at the start of the first transmission is 32 MSS. At 4th transmission round with a threshold (ssthresh) value of 32 ... (TIME OUT) IS 17 OR 18??? AFTER 11TH TRANSMISSION I AM GETIING 16. IS AM I RIGHT .. ANSWER GIVEN IS 9

asked May 9 in Computer Networks by lokeshsharma123456 (15 points) | 7 views

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Self doubt regarding Ip
CN DOUBT: WHEN we connect to internet then the IP address provide us through to our network server. BUT when we are connected to the railway website then what connection they provide us. Are we access those website portals through our IP address? ... process of connection from client to railway website occurs? If anyone explain with this example then it will be a great help

asked May 8 in Computer Networks by lokeshsharma123456 (15 points) | 5 views

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CN ACE Quesn
OSPF send hello messages to know about neighbours for every 10 seconds.Number of links in the network is L'.Hello packet header size is 20 bytes.The degree of router(number of links connected) is m'.Each router ID consumes 4 bytes.Estimate the size of hello messages. 20 + ... please clarify.I feel the answer to be m(20 +4) bytes.It means 20 + 4 bytes will be kept on all m links.

asked May 7 in Computer Networks by Shivateja MST (127 points) | 6 views

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Reverse Path Forwarding ACE Quesn CN
Looking at the above subnet, find how many hops and how many packets are generated by a broadcast from B using the reverse path forwarding? 5 hops, 15 packets 4 hops, 14 packets 5 hops, 21 packets 4 hops, 21 packets Anyone please explain what is reverse path forwarding and clarify this question.

asked May 7 in Computer Networks by Shivateja MST (127 points) | 5 views

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CN Datagram Quesn ACE
What is the maximum bandwidth at which an IP host can send 576-byte packets without having the 16 bit Datagram Identification field wrap around within 60 seconds? Anyone please help me solve this question I couldn’t understand that how can we send a packet without Fragment ID?

asked May 6 in Computer Networks by Shivateja MST (127 points) | 10 views

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CN ACE Quesn IP Adress
IP currently uses 32-bit addresses, if we could re-design to use the 6 bytes MAC address instead of the 32-bit addresses,what is true about the system? Allows IP addresses to be dynamically allocated when the hardware moves to different network ... MAC Address As we use static IP addresses,routing will be much less efficient. No effect on the system Anyone please clarify.

asked May 6 in Computer Networks by Shivateja MST (127 points) | 5 views

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Computer Networks ACE Question
Consider the Go-Back-N protocol with the sender's window size n'.Suppose that at time t, the next in order packet that the receiver is expecting has a sequence number of k.Assume that the medium does not reorder messages.What ... independent acknowledgements(i.e.,in case if acknowledgement timer is very small) then will the sequnece numbers change or remain same?

asked May 6 in Computer Networks by Shivateja MST (127 points) | 3 views

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ACE Bits and Bytes
In a network with address 200.1.0/19, what would be the maximum number of systems possible? $ (a) 2 ^{11}$ $ (b) 2 ^{13}$ $ (c) 2 ^{8}$ $ (d) 2 ^{19}$

asked Apr 29 in Computer Networks by Saitheja Muthoju (6 points) | 17 views

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GATE2020-CS-15 Video Solution
Consider the following statements about the functionality of an IP based router. A router does not modify the IP packets during forwarding. It is not necessary for a router to implement any routing protocol. A router should reassemble IP fragments if the MTU of the ... IP packet. Which of the above statements is/are TRUE? I and II only I only II and III only II only

answered Apr 29 in Computer Networks by amitkhurana512 (187 points) | 8 views

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Behrouz A Forouzan, Data Communications and Networking,

asked Apr 28 in Computer Networks by Hitesh001 (6 points) | 7 views

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Is Base 64 encoding still in gate syllabus
Is MIME protocol and Base 64 encoding still in gate syllabus?

asked Apr 26 in Computer Networks by Sherrinford03 (6 points) | 4 views

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GATE2020-CS-25 Video Solution
Assume that you have made a request for a web page through your web browser to a web server. Initially the browser cache is empty. Further, the browser is configured to send HTTP requests in non-persistent mode. The web page ... five very small images.The minimum number of TCP connections required to display the web page completely in your browser is__________.

answered Apr 26 in Computer Networks by amitkhurana512 (187 points) | 13 views

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Multiple Access Protocols
According to the diagram below, what topics should I study for GATE 2021? I mean what are there in the syllabus and what are not there in the syllabus from the below topics?

asked Apr 24 in Computer Networks by NayakHoonMain (6 points) | 5 views

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GATE2020-CS-55 Video Solution
Consider a TCP connection between a client and a server with the following specifications; the round trip time is $6$ ms, the size of the receiver advertised window is $50$ KB, slow-start threshold at the client is $32$ KB, and the maximum segment ... size of the congestion window (in $\text{KB}$) at time $t+60$ ms after all acknowledgements are processed is _______

answered Apr 23 in Computer Networks by amitkhurana512 (187 points) | 11 views

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subnetting exercise problem Forouzan self doubt
An isp is granted a block of addresses starting with 150.80.0.0/16. The isp wants to distribute these blocks to 2600 customers as follows: a. The first group has 200 medium-size businesses; each needs approximately 16 addresses ... Find out how many addresses are still available after these allocations. I want a step by step clear explanation..pls pls

asked Apr 23 in Computer Networks by debasree88 (14 points) | 17 views

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GATE2020-CS-38 Video Solution
An organization requires a range of IP address to assign one to each of its $1500$ computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses CIDR and serves the requests from the available IP address space $202.61.0.0/17$. The ... $202.61.144.0/21$ I and II only II and III only III and IV only I and IV only

answered Apr 23 in Computer Networks by amitkhurana512 (187 points) | 16 views

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Self Doubt In Checksum in Computer Networks
Write a program in java that can calculate CRC-16 checksum of a text message input using the information in this question here ---> Suppose that the 4-bit generator (G) is 1001, data payload (D) is 10011010 and that r=3. What are the CRC bits (R) associated with the data payload of D = 10011010, given that r=3?

asked Apr 19 in Computer Networks by jainpawan21 (8 points) | 3 views

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applied gate cn
i don,t understnad that cable seize time?

asked Apr 19 in Computer Networks by abhinav649 (68 points) | 4 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 19 in Computer Networks by admin (3.6k points) | 3 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 19 in Computer Networks by admin (3.6k points) | 1 view

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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 19 in Computer Networks by admin (3.6k points) | 3 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 19 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 19 in Computer Networks by admin (3.6k points) | 1 view

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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 19 in Computer Networks by admin (3.6k points) | 2 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 19 in Computer Networks by admin (3.6k points) | 3 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 19 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 19 in Computer Networks by admin (3.6k points) | 3 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 19 in Computer Networks by admin (3.6k points) | 2 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 19 in Computer Networks by admin (3.6k points) | 4 views

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