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Webpage for Computer Networks:
Recent questions tagged computer-networks
2
votes
1
answer
1531
Token generation or refresh rate: Token Bucket
Consider a token bucket with maximum rate = 20 Mbps. Suppose we want to make sure that maximum rate can only be sent for atmost 5 sec at a time and atmost 150 Mb can be sent over 10 sec window. Computer the required value for token refresh rate?
Consider a token bucket with maximum rate = 20 Mbps. Suppose we want to make sure that maximum rate can only be sent for atmost 5 sec at a time and atmost 150 Mb can be s...
Tuhin Dutta
1.4k
views
Tuhin Dutta
asked
Dec 19, 2017
Computer Networks
computer-networks
token-bucket
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–
0
votes
0
answers
1532
Confusion in #RTTs : Slow start-first full window
Suppose, size of a full window is 24 Kb. There is no congestion. 1 MSS = 2 Kb. RTT = 10 ms How long does it take to send the first full window? Approach 1) 2 | 4 | 8 | 16 | 24 = 4 RTTs =4 * 10 ms = 40ms Approach 2) 2 | 4 | 8 | 16 | 24 | = 5 RTTs = 5 * 10 ms = 50ms Which approach is correct?
Suppose,size of a full window is 24 Kb.There is no congestion.1 MSS = 2 Kb.RTT = 10 msHow long does it take to send the first full window?Approach 1) 2 | 4 | 8 | 16 | 24 ...
Tuhin Dutta
410
views
Tuhin Dutta
asked
Dec 19, 2017
Computer Networks
computer-networks
congestion-control
sliding-window
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–
1
votes
1
answer
1533
Doubt in SMTP
When both the sender and receiver are connected to the mail server via a LAN or WAN we need two user agents, two pairs of message transfer agents & one pair of message access agents. Meaning of the above statement and also specify the protocol used.
When both the sender and receiver are connected to the mail server via a LAN or WAN we need two user agents, two pairs of message transfer agents & one pair of message ac...
Tuhin Dutta
775
views
Tuhin Dutta
asked
Dec 19, 2017
Computer Networks
computer-networks
application-layer-protocols
smtp
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–
3
votes
1
answer
1534
Window size
Compute approx. optimal window size, when packet size is 53 B, RTT is 60 micro-sec and bottleneck bandwidth is 155Kbps.
Compute approx. optimal window size, when packet size is 53 B, RTT is 60 micro-sec and bottleneck bandwidth is 155Kbps.
Tuhin Dutta
858
views
Tuhin Dutta
asked
Dec 19, 2017
Computer Networks
computer-networks
sliding-window
go-back-n
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–
3
votes
1
answer
1535
window size of Go_back_N
Two stations A and B are connected via a point to point link. A sends frames to B using Go-Back-N protocol with a window size of 7 and sequence number is of 3 bits. A sends all the frames one by one but B's ACK-3 for frame 3 is not reached to A. But before the timer expires, B received frame 4 and ... 0) a) 0 1 2 3 4 6 b) 3 4 5 6 0 1 2 c) 5 6 7 0 1 2 3 d) 5 6 0 1 2 3 4
Two stations A and B are connected via a point to point link. A sends frames to B using Go-Back-N protocol with a window size of 7 and sequence number is of 3 bits. A sen...
Tuhin Dutta
1.6k
views
Tuhin Dutta
asked
Dec 19, 2017
Computer Networks
computer-networks
sliding-window
go-back-n
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–
1
votes
1
answer
1536
Total time in Transmission Between two stations
A simple network consist of two nodes X and Y. Each node has a single frame of F = 1500 bits (including all header and preambles) to send to each other. Both nodes attempt to transmit at t = 0'. In case that a node executes the exponential Back-off ... TT + PT. And TT = 10 μs and PT = 4 μs, and thus it is total 36μs. but the answer given is 26μs.
A simple network consist of two nodes X and Y. Each node has a single frame of F = 1500 bits (including all header and preambles) to send to each other. Both nodes attemp...
Shubhanshu
752
views
Shubhanshu
asked
Dec 18, 2017
Computer Networks
computer-networks
csma-cd
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–
0
votes
0
answers
1537
Computer network
523^21mod55687=? And how
523^21mod55687=? And how
akankshadewangan24
136
views
akankshadewangan24
asked
Dec 18, 2017
Computer Networks
computer-networks
+
–
0
votes
1
answer
1538
Essential and Optional functionality of each layer in TCP/IP 7-Layer model
Hi Guys, Can anyone please list Essential and Optional functionality of each layer in TCP/IP 7-Layer model ? If some functionality is optional then which other layer/layers could handle that functionality.
Hi Guys,Can anyone please list Essential and Optional functionality of each layer in TCP/IP 7-Layer model ?If some functionality is optional then which other layer/layer...
Chhotu
577
views
Chhotu
asked
Dec 18, 2017
Computer Networks
computer-networks
network-layering
+
–
3
votes
1
answer
1539
Bit Stuffing
In a data link protocol, the following character encoding is used: A → 01000111 B → 11100011 FLAG → 01111110 ESC → 11100000 Assuming that byte stuffing is employed for the four character frame A B ESC FLAG, transmitter sends it ... 01111110 01000111 11100011 11100000 11100000 01111110 01111110 C. 01111110 01000111 11100011 11100000 11100000 11100000 01111110 01111110 D. None of these
In a data link protocol, the following character encoding is used:A → 01000111 B → 11100011 FLAG → 01111110 ESC → 11100000Assuming that byte stuffing is employed ...
Shubham Kumar Gupta
3.0k
views
Shubham Kumar Gupta
asked
Dec 17, 2017
Computer Networks
computer-networks
bit-stuffing
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–
1
votes
2
answers
1540
why stop and wait protocol has flow control but not error control ?
why stop and wait protocol has flow control but not error control ?
why stop and wait protocol has flow control but not error control ?
VIKAS TIWARI
3.3k
views
VIKAS TIWARI
asked
Dec 17, 2017
Computer Networks
computer-networks
stop-and-wait
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–
2
votes
2
answers
1541
Selective Repeat
Consider a network connecting two systems located 4000 kilometers apart. The bandwidth of the network is 64 Mbps. The propagation speed of the media is 2/3 of the speed of light in vacuum. It is needed to design selective repeat sliding window protocol ... processing delays at nodes are negligible. Then, the minimum size in bits of the sequence number field has to be _________.
Consider a network connecting two systems located 4000 kilometers apart. The bandwidth of the network is 64 Mbps. The propagation speed of the media is 2/3 of the speed o...
Shubham Kumar Gupta
1.6k
views
Shubham Kumar Gupta
asked
Dec 16, 2017
Computer Networks
computer-networks
selective-repeat
sliding-window
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–
1
votes
2
answers
1542
MadeEasy Test Series: Computer Networks - Stop And Wait
Consider a wireless link, where the probability of packet error is 0.6. To transfer data across the links, Stop and Wait protocol is used. The channel condition is assumed to be independent from transmission to transmission. The average number of transmission attempts required to transfer x packets is 500. The value of x is _______.
Consider a wireless link, where the probability of packet error is 0.6. To transfer data across the links, Stop and Wait protocol is used. The channel condition is assume...
Shubham Kumar Gupta
1.2k
views
Shubham Kumar Gupta
asked
Dec 16, 2017
Computer Networks
stop-and-wait
computer-networks
made-easy-test-series
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–
1
votes
1
answer
1543
Why does Jamming signal not collide ?
Hi Guys, In Ethernet whenever collision happens station sends a Jamming signal. But why does these special signal not collide ? In many question i saw they also have TT and TP. So what does make them collision free ? PS: Refer Problem 2 on http://web.eecs.umich.edu/~zmao/eecs489/MT2/mt2reviewHints.pdf
Hi Guys,In Ethernet whenever collision happens station sends a Jamming signal. But why does these special signal not collide ?In many question i saw they also have TT and...
Chhotu
1.8k
views
Chhotu
asked
Dec 16, 2017
Computer Networks
computer-networks
csma-cd
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–
0
votes
0
answers
1544
CSMA/CD
1. To transmit and receive digital data between islands using the CSMA / CD multiple access protocol do. As shown in the picture below, the distance between any two islands is 10km . Each island has a digital transceiver compliant with the CSMA / CD protocol. It ... At this time, the retransmitted islands How long do you want to wait and start sending again? Of course, CSMA / CD protocol.
1. To transmit and receive digital data between islands using the CSMA / CD multiple access protocoldo. As shown in the picture below, the distance between any two island...
khjkhj1212
582
views
khjkhj1212
asked
Dec 16, 2017
Computer Networks
computer-networks
csma-cd
ethernet
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–
0
votes
0
answers
1545
Ethernet's multiple access protocol(CSMA/CD)
I have question for CSMA/CD assume, 1. Node : 7 nodes(A,B,C,D,Y,X,Z) 2. maximum distance : 10 km (A to Z is 10km, rests are below 10km) 3. transmission speed : 10Mbps Q1. The distance between Node A and Node Z is 10 ... At this time, the retransmitted islands How long do you want to wait and start sending again? Of course, CSMA / CD protocol. Thank you
I have question for CSMA/CDassume,1. Node : 7 nodes(A,B,C,D,Y,X,Z)2. maximum distance : 10 km (A to Z is 10km, rests are below 10km)3. transmission speed : 10Mbps Q1. The...
khjkhj1212
488
views
khjkhj1212
asked
Dec 16, 2017
Computer Networks
computer-networks
csma-cd
ethernet
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–
0
votes
1
answer
1546
Digital signature doubt
Why do we need a "trusted third party" between a client and a receiver when sending a message with a digital signature? I mean what are the consequences if we don't do that?
Why do we need a "trusted third party" between a client and a receiver when sending a message with a digital signature?I mean what are the consequences if we don't do tha...
Mahendra Singh Kanya
607
views
Mahendra Singh Kanya
asked
Dec 15, 2017
Computer Networks
computer-networks
network-security
digital-signature
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–
0
votes
1
answer
1547
madeeasy work book
Tcp operates over a 40 Gbps link if TCP uses the full bandwidth continously how long in ms would it take the sequence number to wraparound completely?? answer is 0.859sec ??
Tcp operates over a 40 Gbps link if TCP uses the full bandwidth continously how long in ms would it take the sequence number to wraparound completely??answer is 0.859sec ...
aaru14
263
views
aaru14
asked
Dec 14, 2017
Computer Networks
computer-networks
+
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2
votes
1
answer
1548
TCP SEQUENCE NUMBER DOUBT
I have doubt 1: Segment sequence number is equal to the first sequence number of byte in TCP . Is it right ?
I have doubt1: Segment sequence number is equal to the first sequence number of byte in TCP . Is it right ?
hem chandra joshi
1.8k
views
hem chandra joshi
asked
Dec 14, 2017
Computer Networks
sequencenumber
tcp
computer-networks
+
–
0
votes
0
answers
1549
Virtual Gate CN 2018
I'm getting B, but given answer is C.
I'm getting B, but given answer is C.
Hemant Parihar
658
views
Hemant Parihar
asked
Dec 14, 2017
Computer Networks
computer-networks
+
–
0
votes
1
answer
1550
Stop & Wait Protocol
Assume a network that does not drop, duplicate, or corrupt any packets and that you are using a stop-and-wait protocol between two endpoints, A and B. The time it takes for a packet to get from A to B is uniformly distributed between 10 and 20ms. The ... the time you will not have to retransmit it due to a timeout. What is the largest possible timeout you can choose (in ms)?
Assume a network that does not drop, duplicate, or corrupt any packets and that you are using a stop-and-wait protocol between two endpoints, A and B. The time it takes f...
vijay_jr
758
views
vijay_jr
asked
Dec 14, 2017
Computer Networks
stop-and-wait
computer-networks
+
–
0
votes
0
answers
1551
Switching takes extra transmission time?
We know, Packet Switching works like pipelining. It makes transmission time less. But, we do switching with switching delay, then it add extra transmission time.Why? Not getting reason for this. Chk this question for reference:https://gateoverflow. ... time for both. Still one more transmission tim will be added for switching.Can u plz give reason for it?
We know, Packet Switching works like pipelining. It makes transmission time less. But, we do switching with switching delay, then it add extra transmission time.Why?Not ...
srestha
444
views
srestha
asked
Dec 13, 2017
Computer Networks
computer-networks
+
–
0
votes
1
answer
1552
MadeEasy Test Series: Computer Networks - Network Security
s1 only s1 and s2 s2,s3,s4 none of these
s1 onlys1 and s2s2,s3,s4none of these
Shivi rao
400
views
Shivi rao
asked
Dec 12, 2017
Computer Networks
made-easy-test-series
computer-networks
network-security
rsa-security-networks
+
–
2
votes
1
answer
1553
Switching
1)What is switching? And in which layer switching happens? 2)Is circuit better than packet in OSI model? 3)Main difference between circuit switching and packet switching?
1)What is switching? And in which layer switching happens?2)Is circuit better than packet in OSI model?3)Main difference between circuit switching and packet switching?
srestha
742
views
srestha
asked
Dec 12, 2017
Computer Networks
computer-networks
network-switching
+
–
1
votes
1
answer
1554
TCP type of timer configuration
In TCP we use single retransmission timer (associated with oldest unacknowledged segment) or multiple timers(one for each unacknowledged segment)?
In TCP we use single retransmission timer (associated with oldest unacknowledged segment) or multiple timers(one for each unacknowledged segment)?
Jatin18
355
views
Jatin18
asked
Dec 12, 2017
Computer Networks
computer-networks
tcp
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–
0
votes
1
answer
1555
Maximum line speed in MBPS
IP packets whose total length (data plus header) is 16Kb basting out of a router live for 15 seconds. The maximum line speed (in MBPS) of the router can operate at without cycling through the IP datagram identification number space is? Please help and I ... to 16Kb . What I know Identification number is 16 bit in IP. Wrap around Time=Number of byte/Bandwidth. Thanks :)
IP packets whose total length (data plus header) is 16Kb basting out of a router live for 15 seconds. The maximum line speed (in MBPS) of the router can operate at withou...
sunil sarode
3.0k
views
sunil sarode
asked
Dec 12, 2017
Computer Networks
computer-networks
ip-packet
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–
0
votes
1
answer
1556
Digital Signature
In cryptography, we get privacy for Sender and Receiver But why digital signature doesnot provide privacy? Any good reason for it?
In cryptography, we get privacy for Sender and ReceiverBut why digital signature doesnot provide privacy?Any good reason for it?
srestha
1.5k
views
srestha
asked
Dec 12, 2017
Computer Networks
computer-networks
digital-signature
network-security
+
–
0
votes
1
answer
1557
Sequence Number
State True or False, Give Reason I) If the sequence number of a transport layer segment is m, then application layer it's sequence number could also be m II) If the sequence number of a transport layer segment is m, then the sequence number of the subsequent segment is always m+1.
State True or False, Give ReasonI) If the sequence number of a transport layer segment is m, then application layer it's sequence number could also be mII) If the sequenc...
srestha
847
views
srestha
asked
Dec 12, 2017
Computer Networks
computer-networks
sequencenumber
+
–
0
votes
0
answers
1558
Stanford(Computer Networks)
Assume the configuration below: A ---------------- B --------------- C where A-B has an MTU of 1500 bytes and B-C has an MTU of 400 bytes. Assume that link layer frames require 30 bytes of overhead, an IP header is 20 bytes ... header) that A sends, how many bytes must B send to C (including link layer and IP header overhead)? 1050 bytes 1133 bytes 1135 bytes 1450 bytes
Assume the configuration below:A B - Cwhere A-B has an MTU of 1500 bytes and B-C has an MTU of 400 bytes.Assume that link layer frames require 30 bytes of overhea...
vijay_jr
816
views
vijay_jr
asked
Dec 11, 2017
Computer Networks
computer-networks
ip-fragmentation
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–
1
votes
2
answers
1559
payload of a packet
Suppose a packet of length 1800 bytes with minimum header size enter a local area network with MTU (Maximum transfer unit ) of 500 bytes, then how many fragments will be generated from the packet and what is size of the payload of the last packet ?
Suppose a packet of length 1800 bytes with minimum header size enter a local area network with MTU (Maximum transfer unit ) of 500 bytes, then how many fragments will be ...
Warlock lord
2.2k
views
Warlock lord
asked
Dec 11, 2017
Computer Networks
computer-networks
ip-packet
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–
0
votes
1
answer
1560
Connection in TCP
TCP send an SYN=1 and an ACK=1 for data transfer . After data has transferred TCP client want to close the connection sending FIN. So, for closing the connection, what TCP server will send? 1)ACK 2)FIN-1 3)FIN-2 4)None of these
TCP send an SYN=1 and an ACK=1 for data transfer . After data has transferred TCP client want to close the connection sending FIN. So, for closing the connection, what TC...
srestha
539
views
srestha
asked
Dec 11, 2017
Computer Networks
computer-networks
+
–
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