Recent questions tagged computer-networks

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Variable Lengths Subnets
I stumbled upon this note on vlsm. The question goes like: An isp is granted block of addresses starteing with 190.100.0.0/16 (65,536 adds). The isp needs to distribute the addresses to 3 groups of customers: Group 1. 64 customers; each needs 256 address ... semester for this. Please help me. Isn't there any simpler answer? I don't want to waste my time too much on this.

asked 20 hours ago in Computer Networks by Pooh (7 points) | 10 views

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#TCP_Protocol
consider a sender sends 12 segments to a receiver.The RTD between the sender and receiver is 1 msec.The transmission time of each frame is 0.1 msec .The timeout value is 2 msec and there are no negative acknowledgement.In each of the following cases,how ... is used.The window size is 4.The 2nd segment is corrupted.The 4th and the 6th segments are lost during the first transmission.

asked 4 days ago in Computer Networks by Anil Ji Active (1.5k points) | 21 views

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1 answer

3

Computer Networks by Andrew S. Tanenbaum 4th edition chapter 6 Question 4

asked 5 days ago in Computer Networks by Abhilash Mishra (63 points) | 30 views

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4

TCP acknowledgement number
An ACK number of $1000$ in TCP always means that $999$ bytes have been successfully received $1000$ bytes have been successfully received $1001$ bytes have been successfully received None of the above

asked 6 days ago in Computer Networks by bts (107 points) | 34 views

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asked 6 days ago in Computer Networks by mehul vaidya Junior (993 points) | 15 views

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1 answer

6

Ping icmp
Which statement is false? PING is a TCP/IP application that sends datagrams once every second in the hope of an echo response from the machine being PINGED If the machine is connected and running a TCP/IP protocol stack, it should respond to the PING ... condition, an ICMP message is not returned PING display the time of the return response in milliseconds or one of several error message

asked 6 days ago in Computer Networks by bts (107 points) | 23 views

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7

Subnet
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 6 days ago in Computer Networks by bts (107 points) | 48 views

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1 answer

8

IPV4 Header - GATE CS Mock 2018 | Set 2
Which of the following option is false regarding option field in the $IPv4$ header: The Value of "Type" in the Security option field of an IPv4 header is $131$. If the header length is greater than $5$ (i.e., it is from $6$ ... , Option Class, and Option Number are sometimes referred to as a single eight-bit field, the Option Type. None of these

asked 6 days ago in Computer Networks by bts (107 points) | 22 views

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Computer network
Consider the network below, which shows four $10 \hspace{0.1cm} Mbps$ LANs connected by two bridges, labelled $B1$ and $B2$. Assume all users (labelled $1$ through $7$) are very chatty and equally chatty. What is the effective data rate seen by user $4$ ? What ... rate seen by user $6$ ? What is the effective data rate seen by user $6$ if the two bridges are replaced with hubs ?

asked Jun 17 in Computer Networks by Deepesh Pai (9 points) | 30 views

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#Ethernet
Consider the network below, which shows four $10 \hspace{0.1cm} Mbps$ LANs connected by two bridges, labelled $B1$ and $B2$. Assume all users (labelled $1$ through $7$) are very chatty and equally chatty. What is the effective data rate seen by user $4$ ? What is ... data rate seen by user $6$ ? What is the effective data rate seen by user $6$ if the two bridges are replaced with hubs ?

asked Jun 17 in Computer Networks by Anil Ji Active (1.5k points) | 11 views

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#HTTP
Consider Amit lives in Delhi,connected to the internet via a $100 \hspace{0.1cm}Mbps$ connection retrieves a $250 \hspace{0.1cm} KB$ webpage from server in Bangalore, where page contain $3$ images of $500 \hspace{0.1cm} KB$ each.Assume one way propagation delay is ... $HTTP$ and $T2$ is time using persistent connection then $T=T1-T2$ will be ......msec. (Assuming queuing delay is zero)

asked Jun 17 in Computer Networks by Anil Ji Active (1.5k points) | 10 views

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12

GATE syllabus computer networks
Is ATM in GATE 2019 syllabus ?

asked Jun 17 in Computer Networks by Abhilash Mishra (63 points) | 31 views

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13

Routers and IP headers
Which of the following fields of the IP header is not required by intermediate routers ? Protocol Version

asked Jun 16 in Computer Networks by Harsh Kumar (189 points) | 29 views

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14

Self doubt - TCP
True or False An acknowledgement by TCP sender means that data is delivered to the application process.

asked Jun 16 in Computer Networks by Harsh Kumar (189 points) | 15 views

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15

Computer Networks by Andrew S. Tanenbaum 5th edition Chapter 5 (The network Layer) Question 11

asked Jun 16 in Computer Networks by Abhilash Mishra (63 points) | 38 views

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1 answer

16

Forwarding by router
Consider the following routing table of a router. Consider the following three IP addresses. How are the packets with above three destination IP addresses are forwarded? (A) 1->D, 2->B, 3->B (B) 1->D, 2->B, 3->D (C) 1->B, 2->D, 3->D (D) 1->D, 2->D, 3->D

asked Jun 15 in Computer Networks by bts (107 points) | 41 views

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1 answer

17

Bit Rate - Baud Rate
An analog signal has a bit rate of 8000 bps and a baud rate of 1000. Then analog signal has _____ signal elements and carry _____ data elements in each signal. (A) 256, 8 bits (B) 128, 4 bits (C) 256, 4 bits (D) 128, 8 bits

asked Jun 15 in Computer Networks by bts (107 points) | 28 views

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1 answer

18

Error detection
Let C be a binary linear code with minimum distance 2t + 1 then it can correct upto _____ bits of error. A t + 1 B t C t - 2 D t / 2

asked Jun 15 in Computer Networks by bts (107 points) | 17 views

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1 answer

19

Token Ring - ISRO | ISRO CS 2016
In a token ring network the transmission speed is 107 bps and the propagation speed is 200 meters/ μs. The 1-bit delay in this network is equivalent to: (A) 500 meters of cable. (B) 200 meters of cable. (C) 20 meters of cable. (D) 50 meters of cable.

asked Jun 15 in Computer Networks by bts (107 points) | 11 views

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1 answer

20

Computer Networks: efficiency - Gate 2018 mock set 2

asked Jun 15 in Computer Networks by bts (107 points) | 14 views

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21

Computer Networks by Andrew S. Tanenbaum, 4th edition chapter:5 (The Network Layer), Question:5

asked Jun 14 in Computer Networks by Abhilash Mishra (63 points) | 36 views

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22

Time to live
When is TTL decreased? 1- only at routers? 2- any device having network layer (including hosts in between the path) : example: source subnet has ethernet and destination subnet has token ring : all hosts and routers that come in packets.s path will decrease TTL or only router will decrease TTL?

asked Jun 14 in Computer Networks by bts (107 points) | 24 views

+2 votes

1 answer

23

TCP - Stanford Lectures
In one of the quizes, they asked the following question : "A server typically listens for TCP connections on a particular port (e.g. 80 for HTTP or 22 for SSH). Which fields can the server use to distinguish packets for a particular ... address from the packet received from the client... (After all, this destination IP address corresponds to the Server itself !).

asked Jun 13 in Computer Networks by Harsh Kumar (189 points) | 33 views

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24

doubt
Can anyone derive efficiency formula of CSMA/CD please?

asked Jun 9 in Computer Networks by Angkit Active (3.8k points) | 32 views

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25

Pure ALOHA
A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 1000 frames per second? Please solve by mentioning step by step procedure!

asked Jun 9 in Computer Networks by Naveen Kumar 3 (453 points) | 35 views

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26

Doubt
In RTT(round trip time),why do we need to calculate the transmission time? bcz-"round-trip delay time (RTD) or round-trip time (RTT) is the length of time it takes for a signal to be sent plus the length of time it takes for an ... This time delay therefore consists of the propagation times between the two points of a signal." REf: https://gateoverflow.in/43470/gate2009-58

asked Jun 9 in Computer Networks by Angkit Active (3.8k points) | 25 views

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27

basic question
Q1 one of the following is not the type of active attack A. Denial of services B Masquerades C. Fabrication D. Traffic analysis if possible try to explain each option i tried to read it from wiki but didn't get more clarity

asked Jun 9 in Computer Networks by Prateek kumar Loyal (7.7k points) | 47 views

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28

Circuit switching
If two host are connected by a link and in middle of the link there is a switch between them, then transmission and propagation time both doubled. But if for the same link, there is no switch between that two hosts, then propagation time and ... once Why that happens? Though both are operating on same link, why only a switch doubles propagation delay and transmission delay time?

asked Jun 8 in Computer Networks by srestha Veteran (86.9k points) | 27 views

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1 answer

29

Firewall
" Firewall will only allow external hosts to send packets on existing open TCP connections or connections that are being opened (by internal hosts) but not allow them to open TCP connections to hosts in the private network" What problem will arise, if it open TCP connections to hosts in the private network ?

asked Jun 7 in Computer Networks by srestha Veteran (86.9k points) | 19 views

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1 answer

30

What is the relation between sender window size and various terms like last acknowledged frame , last sent frame , etc ?

asked Jun 4 in Computer Networks by radha gogia Loyal (7.1k points) | 55 views

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