Recent questions tagged tcp / GATE Overflow for GATE CSE

1 votes

0 answers

181

self doubt
can anyone show me a good resource to study SACK IN TCP or explain me ?

can anyone show me a good resource to study SACK IN TCP or explain me ?

Venkat Sai

254 views

Venkat Sai asked Oct 11, 2017

3 votes

1 answer

182

bitrate by Life time of segment
In a network that has a max TPDU size of 128 bytes, a maximum of TPDU lifetime of 30 sec, and 8-bit sequence number, what is the maximum data rate per connection? Please help me to understand this problem.

In a network that has a max TPDU size of 128 bytes, a maximum of TPDU lifetime of 30 sec, and 8-bit sequence number, what is the maximum data rate per connection?Please h...

AnilGoudar

2.2k views

AnilGoudar asked Oct 9, 2017

1 votes

1 answer

183

Info about RFC
Can someone tell me what is RFC and how is it related to Computer Networks? How to actually extract information from it?

Can someone tell me what is RFC and how is it related to Computer Networks? How to actually extract information from it?

Parshu gate

500 views

Parshu gate asked Oct 9, 2017

0 votes

3 answers

184

While TCP is a connection oriented service then why its segment follows different path.
I am reading Forouzan in that I have stuck here, I know that. TCP is connection oriented service, means it all segments follow same path, and segments are in order delivered. But it says that TCP ... . How it is happening. Consider this screen shot of Forouzan:- Please explain the proper reason behind it.

I am reading Forouzan in that I have stuck here, I know that.TCP is connection oriented service, means it all segments follow same path, and segments are in order deliver...

Shubhanshu

2.2k views

Shubhanshu asked Aug 23, 2017

5 votes

1 answer

185

Congestion Control
Q1 Let the size of the congestion window of a TCP connection be 64KB when a timeout occurs. The RTT of the connection is 50m sec and maximum segment size is 2 KB. The time taken by the TCP to get back to 64KB congestion window is _________. I am getting difficulty in finding the RTT's of the connection.

Q1 Let the size of the congestion window of a TCP connection be 64KB when a timeout occurs. The RTT of the connection is 50m sec and maximum segment size is 2 KB. The tim...

Shubhanshu

3.1k views

Shubhanshu asked Aug 23, 2017

5 votes

2 answers

186

Fragmentation
Suppose a network:- Suppose a TCP message contains 492 B of data and TCP header is of size 20B then deliver it to IP. IP header is 20 B. Assume link A-R1 has the maximum frame size of 700 B including a frame size of 14 B, link R1-R2 can support a ... of 256 B including a 12 B frame header. Then calculate the no of fragments at each link and show the format of fragments in each link.

Suppose a network:-Suppose a TCP message contains 492 B of data and TCP header is of size 20B then deliver it to IP. IP header is 20 B.Assume link A-R1 has the maximum fr...

Shubhanshu

2.4k views

Shubhanshu asked Aug 19, 2017

0 votes

2 answers

187

TCP 3 Way Handshaking
In TCP 3 way handshaking mechanism why the data is not started being transmitting from the 3rd step itself I.e. 1. A-> B / SYN FROM A 2. A<-B / SYN AND ACK FROM B 3. A-> B / ACK FROM A.

In TCP 3 way handshaking mechanism why the data is not started being transmitting from the 3rd step itself I.e.1. A- B / SYN FROM A2. A<-B / SYN AND ACK FROM B3. A- B / A...

Shubhanshu

1.1k views

Shubhanshu asked Aug 18, 2017

5 votes

0 answers

188

Computer Networks: AIMD and Slow Start
Consider a system, where sender sends 50 packets to the receiver, and suppose during the transmission packet no 10, 25, 34, 45 are lost, then calculate the through put(in bits/sec) of the system, using i) AIMD ii) Slow Start 1 RTT = 100ms. Packet size = 1024 B = 1 KB.

Consider a system, where sender sends 50 packets to the receiver, and suppose during the transmission packet no 10, 25, 34, 45 are lost, then calculate the through put(in...

Shubhanshu

875 views

Shubhanshu asked Aug 18, 2017

7 votes

2 answers

189

CN: TCP Window Size
Consider TCP congestion control. Assuming RTT as 4 seconds and segment size as 3KB, if bandwidth is 500kbps, what is the smallest window size for which there is no stalling in this case?

Consider TCP congestion control. Assuming RTT as 4 seconds and segment size as 3KB, if bandwidth is 500kbps, what is the smallest window size for which there is no stalli...

rahul sharma 5

1.7k views

rahul sharma 5 asked Aug 16, 2017

2 votes

1 answer

190

Cn: Transport layer protocol
Which of the following transport layer protocols used to support email? a:) SMTP b:) TCP c::)UDP d) both b and c

Which of the following transport layer protocols used to support email?a:) SMTPb:) TCPc::)UDPd) both b and c

rahul sharma 5

2.2k views

rahul sharma 5 asked Aug 15, 2017

3 votes

1 answer

191

CN Slow Start Throughput
R.T.T=10 microsec. M.S.S=100 Bytes Slow start protocol used to send data.Sender needs to send data till it completes sending window size 8MSS.Find:- a. Total Time taken b. Throughput for 1st RTT c. Total Throughput d. Average Throughput

R.T.T=10 microsec.M.S.S=100 BytesSlow start protocol used to send data.Sender needs to send data till it completes sending window size 8MSS.Find:-a. Total Time takenb....

rahul sharma 5

1.1k views

rahul sharma 5 asked Aug 13, 2017

2 votes

2 answers

192

Computer Networks
In TCP checksum is mandatory but in UDP checksum is optional. Why ?

In TCP checksum is mandatory but in UDP checksum is optional. Why ?

Ashish Roy

1.7k views

Ashish Roy asked Aug 6, 2017

2 votes

2 answers

193

#GATE2018 #GATE #COMPUTERSCIENCE #GATECSE
does packets in TCP follow the same route from the source to destination or different? And what is really a connection oriented and connectionless service?

does packets in TCP follow the same route from the source to destination or different? And what is really a connection oriented and connectionless service?

popo040

1.6k views

popo040 asked Jun 28, 2017

0 votes

1 answer

194

Computer Network
I know I shouldn't be asking this but still: Window size is 16 bits in TCP so maximum possible value is 2^16=65535 bytes. Why bytes not bits?

I know I shouldn't be asking this but still:Window size is 16 bits in TCP so maximum possible value is 2^16=65535 bytes.Why bytes not bits?

Bad_Doctor

509 views

Bad_Doctor asked Jun 12, 2017

0 votes

1 answer

195

TCP header
When Checksum is calculated in TCP, why IP header is also included? since it is included why it is only used in computation and not in transmission.

When Checksum is calculated in TCP, why IP header is also included? since it is included why it is only used in computation and not in transmission.

Bad_Doctor

559 views

Bad_Doctor asked Jun 8, 2017

0 votes

2 answers

196

Test by Bikram | Mock GATE | Test 4 | Question: 48
Which kind of connection between the client and server is opened by $\text{TCP?}$ One-way Symmetric Connection One-way Asymmetric Connection Two-way Symmetric Connection Two-way Asymmetric Connection

Which kind of connection between the client and server is opened by $\text{TCP?}$ One-way Symmetric Connection One-way Asymmetric Connection Two-way Symmetric Connection ...

Bikram

392 views

Bikram asked May 14, 2017

3 votes

2 answers

197

Test by Bikram | Mock GATE | Test 4 | Question: 34
The bandwidth of a $TCP$ connection is $1048560$ $bits/s$. Let $a$ be the value of $RTT$ in milliseconds, after which $TCP$ window scale option is required. Let $b$ be the maximum possible window size (with window scale option). Then, the value of $a$ ... $65535 \times 2^{14}$ $500$ and $65535 \times 2^{16}$ $500$ and $65535 \times 2^{14}$

The bandwidth of a $TCP$ connection is $1048560$ $bits/s$. Let $a$ be the value of $RTT$ in milliseconds, after which $TCP$ window scale option is required. Let $b$ be th...

Bikram

654 views

Bikram asked May 14, 2017

0 votes

1 answer

198

TCP/IP by forozen
1.RTT Deviation =$RTT_{D}$=(1-$RTT_{D\beta }$) old $RTT_{D}$ + $RTT_{D\beta }$ * | ($RTT_{S}$ -$RTT_{M}$)| 2.RTT Deviation =$RTT_{D}$=(1-$RTT_{D\beta }$) old $RTT_{D}$ + $RTT_{D\beta }$ * | ($RTT_{M}$)| Which of the following is right formula for calculation and in what conditions ?I found bot formula right in sone numericals?

1.RTT Deviation =$RTT_{D}$=(1-$RTT_{D\beta }$) old $RTT_{D}$ + $RTT_{D\beta }$ * | ($RTT_{S}$ -$RTT_{M}$)|2.RTT Deviation =$RTT_{D}$=(1-$RTT_{D\beta }$) old $RTT_{D}$ + $...

Kuldeep Pal

783 views

Kuldeep Pal asked May 7, 2017

4 votes

4 answers

199

Congestion avoidance in TCP
During Congestion avoidance(Additive Increase) in tcp when 3 duplicate ACKs arrived then during that arrival phase by which algorithm did the sender window adopt increment procedure? a) Sender window uses additive increase b)Sender window uses slow start which option is correct?

During Congestion avoidance(Additive Increase) in tcp when 3 duplicate ACKs arrived then during that arrival phase by which algorithm did the sender window adopt increme...

Shubham Sharma 2

2.5k views

Shubham Sharma 2 asked Feb 19, 2017

0 votes

1 answer

200

pre ladder quiz
Consider the TCP is using slow-start congestion control.After having 10th consecutive transmission failed due to Timeout,the current threshold value is set to 7KB .what was the congestion window size at the time of starting of these transmissions ? assume MSS= 1kb

Consider the TCP is using slow-start congestion control.After having 10th consecutive transmission failed due to Timeout,the current threshold value is set to 7KB .what w...

anonymous

573 views

anonymous asked Feb 15, 2017

41 votes

7 answers

201

GATE CSE 2017 Set 1 | Question: 14
Consider a TCP client and a TCP server running on two different machines. After completing data transfer, the TCP client calls close to terminate the connection and a FIN segment is sent to the TCP server. Server-side TCP responds by sending an ACK, which is ... TCP connection wait for the FIN from the server-side TCP? LAST-ACK TIME-WAIT FIN-WAIT-$1$ FIN-WAIT-$2$

Consider a TCP client and a TCP server running on two different machines. After completing data transfer, the TCP client calls close to terminate the connection and a FIN...

yg92

13.9k views

yg92 asked Feb 14, 2017

1 votes

1 answer

202

Test by Bikram | Mock GATE | Test 3 | Question: 53
The $TCP$ congestion window is set to $20$ $KB$ and a timeout occurs. Assume that the maximum segment size is $1$ $KB$. Then, if the next four transmission bursts are all successful, the window size is _______ $KB$.

The $TCP$ congestion window is set to $20$ $KB$ and a timeout occurs. Assume that the maximum segment size is $1$ $KB$.Then, if the next four transmission bursts are all ...

Bikram

677 views

Bikram asked Feb 9, 2017

3 votes

1 answer

203

Test by Bikram | Mock GATE | Test 3 | Question: 52
Read the below mentioned statements: The size of the $TCP$ advertised window never changes throughout the duration of the connection. With the Selective Repeat protocol (which uses selective acknowledgement) it is not possible for the sender to receive ... current window. Which of the above statements is FALSE? I and II II only II and III I only

Read the below mentioned statements:The size of the $TCP$ advertised window never changes throughout the duration of the connection.With the Selective Repeat protocol (w...

Bikram

638 views

Bikram asked Feb 9, 2017

0 votes

1 answer

204

Computer network MSS and MTU
Are these definations of MSS and MTU correct?? MSS is maximum payload of TCP segment. TCP segment (MSS + TCP header) For IPpacket, it consists of (MSS + TCP header + IP header) And payload of IP packet means (TCPheader + MSS) Ethernet frame ... Also is fragmentation always done at router?? Can it be done by source?? I am really confused about these terms. Plz verify.

Are these definations of MSS and MTU correct??MSS is maximum payload of TCP segment.TCP segment (MSS + TCP header)For IPpacket, it consists of (MSS + TCP header + IP head...

Rahul Jain25

2.9k views

Rahul Jain25 asked Feb 8, 2017

2 votes

2 answers

205

TCP and UDP checksum
Consider a scenario where UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field. Which of the statement below is true with respect to the above scenario? Receiver is absolutely sure ... error Answer given is D but I feel it should be B because Tcp checksum is calculated on data and header both.

Consider a scenario where UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field.Which...

reena_kandari

2.2k views

reena_kandari asked Feb 8, 2017

1 votes

0 answers

206

#Networks #AIMD #TCP #CongessionControl
What is the initial thresold should be taken in AIMD ? Is it is reciever's advertise window size or half of it. Please clearify.

What is the initial thresold should be taken in AIMD ?Is it is reciever's advertise window size or half of it. Please clearify.

lifeisshubh

434 views

lifeisshubh asked Jan 27, 2017

1 votes

0 answers

207

Query
I am having problems understanding these inequalities with regard to TCP connection. Receiving side LastByteRcvd - NextByteRead <= MaxRcvBuffer AdvertisedWindow = MaxRcvBuffer - (LastByteRcvd - NextByteRead) Sending side LastByteSent -LastByteAcked <= AdvertisedWindow ... -LastByteAcked) + y > MaxSendBuffer Please either explain yourself or provide some useful link. Thank you.

I am having problems understanding these inequalities with regard to TCP connection.Receiving sideLastByteRcvd - NextByteRead <= MaxRcvBufferAdvertisedWindow = MaxRcvBu...

itachi

346 views

itachi asked Jan 25, 2017

2 votes

2 answers

208

Transport Layer
Solution for Q1 ,Q2?

Solution for Q1 ,Q2?

Shubham Sharma 2

1.4k views

Shubham Sharma 2 asked Jan 25, 2017

0 votes

1 answer

209

tcp frame
Suppose a server transmits one frame of a video every second, and the client starts playing the video at one frame per second as soon as the first frame arrives. Suppose the first ten frames arrive at times 0, 1.2, 1.99, 4.17, 4.01, 5.03, 8.05, 7.50, 8.90, 8.99, all in seconds. Which frames reach the client too late for playout? (A) 7 (B) 3 (C) 6 (D) 5

Suppose a server transmits one frame of a video every second, and the client starts playing the video at one frame per second as soon as the first frame arrives. Suppose ...

indrajeet

699 views

indrajeet asked Jan 25, 2017

2 votes

1 answer

210

TCP Sequence Number [GateBook]

biranchi

688 views

biranchi asked Jan 24, 2017

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