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Recent questions tagged computer-network

0 votes
2 answers 4 views
Which of the following timers is known to keep the window size flowing even if the connection is terminated on the other end? Persistent Timer Keep Alive Timer Retransmission timer Time out timer
asked Sep 11 in Computer Networks GAITONDE 567 points 4 views
0 votes
0 answers 13 views
0 votes
0 answers 5 views
asked Sep 11 in Computer Networks GAITONDE 567 points 5 views
0 votes
0 answers 1 view
Consider a system with 3 network connected via two router, network A has MTU of 800 bytes, network B has MTU of 400 bytes, network C has MTU of 800 bytes. They have considered Data as 680 itself, but shouln’t we do 680-20 =660, or as they have mentioned segment instead of packet that is why we are not subtracting the header?
asked Sep 11 in Computer Networks GAITONDE 567 points 1 view
0 votes
0 answers 4 views
Ans should be 2 right?
asked Sep 11 in Computer Networks GAITONDE 567 points 4 views
0 votes
0 answers 4 views
Both A and C should be ans right?
asked Sep 10 in Computer Networks GAITONDE 567 points 4 views
0 votes
1 answer 5 views
Question: 27 Suppose an organisation has CIDR based IP address 215.58.204.10./20, Organisation decided to divide the network into three subnet name as X, Y, Z respectively. Which of the following is a valid IP address of the subnet Y? 1. 215.58.192.12/22 2. 215.58.201.100/22 ... 254/21 4. None of these According to me both a and b can be the ans, but they have provided only B as ans. Who is right?
asked Sep 10 in Computer Networks GAITONDE 567 points 5 views
0 votes
0 answers 4 views
Note→ MULTIPLE OPTIONS CORRECT
asked Sep 9 in Computer Networks GAITONDE 567 points 4 views
0 votes
0 answers 7 views
I am facing serious troubles while calculating number of fragments. I read a formula #fragments = ceil (payload/ mtu-header) but this isn't giving correct answer in all the cases. Before I show my approach, I would like to ask what does PDU imply? Does it mean header is ... formula 1 #frags= ceil(17076/180)=95 Using formula 2, #frags= ceil(17076/176)=98 No match either. Where am I going wrong?
asked Sep 8 in Computer Networks DukeThunders 132 points 7 views
0 votes
0 answers 6 views
0 votes
0 answers 6 views
Consider the population of various continents as follows: Africa - 900 Million; Asia - 3700 Million; North America-400 Million; South America-500 Million; Europe- 700 Million; Consider the above data. Suppose each person requires 100 IP addresses. Then design an appropriate CIDR scheme that ... 2^1$^0$) OPTIONS a. b. C It is not possible to fulfil the above requirement D Both A and B are valid
asked Sep 8 in Computer Networks GAITONDE 567 points 6 views
0 votes
0 answers 3 views
A 40 Mbps broadcast network that controls medium access using polling has 20 hosts and time required for polling the next host is 80 μsec. whenever a node is polled, it is allowed to transmit 4000 bytes. Find the efficiency of the broadcast channel (A) 100/9 (B) ... or Polling, if there are n hosts, will the total bandwidth get divided among the hosts or will all hosts transmit at full capacity?
asked Aug 30 in Computer Networks Sambhrant Maurya 204 points 3 views
0 votes
1 answer 13 views
Assuming that, for given network layer implementation, connection establishment overheads are 100 bytes and disconnection are 28 bytes, what would be the minimum size of a packet the transport layer needs to keep if it wishes to implement a datagram service above network ... to keep its overhead to a maximum of 12.5%. Ignore transport layer overheads. 512 bytes 768 bytes 1152 bytes 1024 bytes
asked Aug 7 in Computer Networks sagar2405 87 points 13 views
0 votes
0 answers 3 views
Consider host A wants to transmits a 25000 bytes long file to host B using TCP. If MSS is 1000 bytes and slow start threshold is 16 MSS. How many RTT it will take to transmits the complete file?
asked Aug 5 in Computer Networks sagar2405 87 points 3 views
0 votes
1 answer 5 views
Consider a TCP based protocol over 40 Gbps; A single TCP connection is allowed to use all the available bandwidth. How long wraparound occurs in sec?
asked Aug 5 in Computer Networks sagar2405 87 points 5 views
0 votes
1 answer 29 views
Can anyone explain how to approach the question and tell the solution ? Given ans is 176 ms .
asked Aug 2 in Computer Networks user2525 1.5k points 29 views
0 votes
1 answer 19 views
Consider two host connected to each other over 1Mbps link where distance between them is 10,000 km and propagation speed is 2*10^8 m/s. If frame size 1000 Byte and window size is 5. What is maximum achievable throughput if ack are always piggybacked?
asked Aug 1 in Computer Networks sagar2405 87 points 19 views
0 votes
0 answers 1 view
Consider that at time t, a TCP connections has a congestion window of 4000 bytes. The maximum segment size used by the connection is 1000 bytes. What is the congestion window(in bytes) after it send out 4 packets and receive acks for all of them? Suppose thre is one ack per packet. If the connection is in slow start? If the connection is in congestion avoidance?
asked Jul 30 in Computer Networks sagar2405 87 points 1 view
0 votes
1 answer 8 views
If a TCP server was to simultaneously support N clients, how many sockets would the TCP server need? 1 2 N N+1 Please answer the above question for UDP also.
asked Jul 30 in Computer Networks sagar2405 87 points 8 views
0 votes
0 answers 3 views
A 3000-km-long T1 trunk is used to transmit a 64-byte frame. Assume the propagation speed is 6microsec/km. (Note that the data rate for T1 carries is 1.544 Mbps). If go-back-N protocol is used,in order to achieve an efficiency of 100%. What is the maximum number of bits of the sequence number?
asked Jul 27 in Computer Networks sagar2405 87 points 3 views
0 votes
0 answers 7 views
Two stations communicate on a 50Kbps satellite channel (ground to ground propagation delay of 270 msec) using 10,000 byte frame and a Go back N protocol with 5-bit sequence numbers. Assuming that frame error probability is 0.15, determine the maximum data rate from A to B. 50 Kbps 40.45 Kbps 45.40 Kbps 45.45 Kbps
asked Jul 26 in Computer Networks sagar2405 87 points 7 views
0 votes
0 answers 5 views
What is the total overhead bits ( header and retransmission ) with data frames consisting of 40 bits header and 3960 data bits. ACK frames never occur. NAK frames are 40 bits, the error rate for frame is 2 % and for NAK frame is negligible ? My approach : given ... .8 bits Can anyone explain how the answer is coming to be 120.8 bits and more importantly, how the overhead for NAK is calculated ?
asked Jul 19 in Computer Networks user2525 1.5k points 5 views
0 votes
1 answer 7 views
In Pseudo network, if total length bits is 16, fragment offset is 12 bits then what multiple of fragment offset will indicate the starting address of fragment ________. Answer with proper explanation
asked Jul 11 in Computer Networks Hirak 1.2k points 7 views
0 votes
0 answers 7 views
Consider a CSMA/CD with frame size is 20 KB and transmission rate is 10 Kbps, then maximum length of the cable (km) required, if signal speed is 15 km/sec ________. (Upto 2 decimal places) Made easy provided ans as 0.24 km and I believe they are wrong as mine came out to be different..What is the ans that u are getting?
asked Jul 11 in Computer Networks Hirak 1.2k points 7 views
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