Recent questions tagged computer-networks

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1

Applied Test Series
In the CSMA/CD network the bandwidth of the link is 10 Mbps, two stations are connected at both the ends of the link. The speed of the transmission on the links is 5 x 10 ^6 m/sec. What is the length of the link in kilometre, if the minimum frame size is 500 bytes ?

LRU asked in Computer Networks 1 day ago

by LRU

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2

Applied Test Series
How big would the window size have to be for the channel utilization to be greater than 98 percent and the bandwidth is 1 Gbps? Suppose that the size of a packet is 1,500 bytes, including both header fields and data. The one way propagation delay is 15 milliseconds for the channel ?

LRU asked in Computer Networks 1 day ago

by LRU

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3

Computer Networks
How do we calculate the time in this scenario

Parshu gate asked in Computer Networks 2 days ago

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1 answer

4

Applied Test Series
A link has a transmission speed of 500 × 10^6 bpsec. Assume acknowledgment has negligible transmission delay, and it's one way propagation delay is 2 sec. Also assumes that the processing delays at nodes are also negligible. If data packet size is 107 bits, then the efficiency of Go-Back-7 protocol is _______ (in %) [Correct upto two places of decimals].

LRU asked in Computer Networks Oct 13

by LRU

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5

Applied Test Series
In the GO back N ARQ sender is sending the 20 packets to the destination with a window size of 4. Every sixth packet is lost and after a packet loss sender is sending one dummy packet outside the window for ensuring everything is correct [ dummy packet is an outside packet not the part of the window]. How many number of transmissions will be there?

LRU asked in Computer Networks Oct 13

by LRU

25 views

1 vote

1 answer

6

Applied Test Series
Two systems are connected with the link and link is having a bandwidth of 20 Mbps. Assume the distance between them is 2400 km and the size of the packet is 2 KB with propagation speed is the same as the speed of light. What is the minimum number of bits required for the window to achieve 100% utilization in selective repeat protocol?

LRU asked in Computer Networks Oct 13

by LRU

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1 answer

7

Applied Test Series
In a CDMA/CD network with a data rate of 20 Mbps, the maximum distance between station pair is found to be 2000 m then what is the minimum transmission time(in sec) for the network if the speed is 4 * 10 ^4 m/sec ?

LRU asked in Computer Networks Oct 13

by LRU

23 views

1 vote

1 answer

8

Applied Test Series
Suppose that the PURE ALOHA protocol is used to share a 50 Kbps satellite channel, suppose that frames are 1000 bits long. Find the maximum throughput of the system in frames/second. [Note: Assume K = 10^3, write the floor value of the answer]

LRU asked in Computer Networks Oct 13

by LRU

32 views

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1 answer

9

Applied Test Series
What will be the length of maximum burst in sec where the capacity of the router is 10MB. The maximum output rate of the router is 20 MBPS and the token rate is 12 MBPS.

LRU asked in Computer Networks Oct 10

by LRU

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1 answer

10

Applied Test Series
Let an IP datagram of the following data and header sizes be sent through a network of MTU 500 bytes. Calculate the fragment offset values that should be set for 3rd fragment ? IP header = 40 bytes TCP header = 60 bytes• Data = 1000 bytes• MTU = 500 bytes•

LRU asked in Computer Networks Oct 10

by LRU

29 views

1 vote

1 answer

11

Applied Test Series
Suppose TCP uses congestion control without slow start.The first transmission start with 1 MSS, Assuming cwnd increases by 3 MSS every time a batch of ACKs is received and assuming approximately constant round-?trip times, the next window after timeout will ... timeout occurs at the sixth transmission, how many total round trip time requires to reach the window size of 20 MSS.

LRU asked in Computer Networks Oct 8

by LRU

51 views

1 vote

2 answers

12

Applied Test Series
In the TCP connection, the maximum segment size used by the connection is 1000 bytes. What is the congestion window(in bytes) after the 4th transmission and receives acks for all of them? Assume the connection uses only slow-start ?

LRU asked in Computer Networks Oct 8

by LRU

47 views

1 vote

1 answer

13

Applied Test Series
Suppose TCP uses AIMD for its congestion control without slow start. Assuming cwnd increases by 2 MSS every time a batch of ACKs is received and assuming approximately constant round-trip times, how long in round trip time does it take for cwnd to increase from 4 MSS to 12 MSS (assuming no loss events)?

LRU asked in Computer Networks Oct 8

by LRU

26 views

1 vote

1 answer

14

Applied Test Series
Consider a selective repeat sliding window protocol, the window size of the sender is 128. What will be the sequence number for the 800th frame? [ Assume the available sequence number are the minimum required for window size of 128]

LRU asked in Computer Networks Oct 7

by LRU

38 views

1 vote

1 answer

15

Applied Test Series
For the given network address 178.100.0.0 we need the 2000 subnets and 15 usable hosts then what will be the subnet mask for this allotment ?

LRU asked in Computer Networks Oct 7

by LRU

31 views

1 vote

1 answer

16

Applied Test Series
Consider source and destination in a 10 Mbps network with sender window has 5 packets. Transmission delay for a packet is 10 micro-sec. Propagation delay from source to destination is 250 micro-sec. How long is the sender idle once a window is transmitted before starting the second window? Assume ACK transmission time is negligible.

LRU asked in Computer Networks Oct 4

by LRU

43 views

0 votes

1 answer

17

Applied Test Series
How big would the window size have to be for the channel utilization to be greater than 98 percent and the bandwidth is 1 Gbps? Suppose that the size of a packet is 1,500 bytes, including both header fields and data. The one way propagation delay is 15 milliseconds for the channel ?

LRU asked in Computer Networks Oct 4

by LRU

40 views

1 vote

1 answer

18

Applied Test Series
Consider the size of the congestion window of a TCP connection be 40 KB when a timeout occurs. The round trip time of the connection is 50 msec and the maximum segment size used is 2 KB. How much time it will be required(in milli sec) to reach the congestion window of 30 KB?

LRU asked in Computer Networks Oct 4

by LRU

37 views

1 vote

1 answer

19

Applied Test Series
The packet is sent from source to router with the link having the maximum transmission unit (MTU) as 480 bytes, the header is of size 20 bytes. The intermediate fragment size is X and the last fragment size is Y when the packet size is of 2000 bytes including the header. Calculate the value of X+Y in bytes?

LRU asked in Computer Networks Oct 4

by LRU

39 views

0 votes

1 answer

20

Applied Test Series
Suppose a router receives an IP packet containing 600 data bytes and has to forward the packet to a network with a maximum transmission unit of 200 bytes. Assume that the IP header is 20 bytes long. What will be the fragment offset of the third fragment ?

LRU asked in Computer Networks Oct 4

by LRU

36 views

0 votes

1 answer

21

Applied Test Series
A PC has just booted up and wants to communicate with a host on a remote subnet. The PC knows the IP addresses of its default gateway and the remote host. However, in order to properly construct a frame, the PC needs an appropriate destination MAC address. What MAC address does the PC need to learn, and what protocol will the PC use to learn that MAC address?

LRU asked in Computer Networks Oct 4

by LRU

32 views

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1 answer

22

Applied Test Series
On any given Sunday, Sam initiates a connection with his girlfriend Alice in order to plan out what movie they're going to watch on Tuesdays with Morrie. This Sunday, immediately after Sam initiates the connection, Alice decides to send him a 60 KB ... congestion window of 1. Neglect queuing and processing delays at both the sender and receiver, and assume there are no losses.

LRU asked in Computer Networks Oct 1

by LRU

60 views

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1 answer

23

Applied Test Series
Consider the effect of using additive increase multiplicative decrease(AIMD) on a line with propagation delay of 10ms.The receive window is 24KB and the maximum segment size is 2KB. How long does it take to completely send full window size segment in ms initial threshold of 20KB?

LRU asked in Computer Networks Sep 30

by LRU

38 views

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1 answer

24

Applied Test Series
Consider the effect of using slow start on a line with 12 msec round trip time. The size of the congestion window is set to 40 KB. The sender side threshold is set to 20 KB. After 7th transmission a time-out occurs, after timeout the time taken to send the first full window of 20 KB is (in msec). ? [ Assume window size at the start of the slow start phase is 2 KB, MSS=2KB]

LRU asked in Computer Networks Sep 30

by LRU

37 views

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0 answers

25

Network Layer - Computer Networks - Tanenbaum
The question states - An IP datagram using Strict source routing option has to be fragmented. Do you think the option is copied into each fragment, or is it sufficient to just put it in the first fragment? Explain your answer. My thinking ... every fragment. I doubt this reasoning and don't see any flaws in my own answer. Where is my answer lacking?

atulcse asked in Computer Networks Sep 16

57 views

3 votes

5 answers

26

GATE CSE 2021 Set 2 | Question: 7
Consider the three-way handshake mechanism followed during $\text{TCP}$ connection establishment between hosts $P$ and $Q$. Let $X$ and $Y$ be two random $32$-bit starting sequence numbers chosen by $P$ and $Q$ respectively. Suppose $P$ sends a $\text{TCP}$ connection request ... $=Y$, $\text{ACK}$ bit $=1$, $\text{ACK}$ number $=X$, $\text{FIN}$ bit $=0$

Arjun asked in Computer Networks Feb 18

by Arjun

1.9k views

2 votes

2 answers

27

GATE CSE 2021 Set 2 | Question: 34
Consider the cyclic redundancy check $\text{(CRC)}$ based error detecting scheme having the generator polynomial $X^3+X+1$. Suppose the message $m_4m_3m_2m_1m_0=11000$ is to be transmitted. Check bits $c_2c_1c_0$ are appended at the end of the ... is denoted by $m_4m_3m_2m_1m_0c_2c_1c_0$. The value of the checkbit sequence $c_2c_1c_0$ is $101$ $110$ $100$ $111$

Arjun asked in Computer Networks Feb 18

by Arjun

1.3k views

5 votes

1 answer

28

GATE CSE 2021 Set 2 | Question: 45
Consider a computer network using the distance vector routing algorithm in its network layer. The partial topology of the network is shown below. The objective is to find the shortest-cost path from the router $R$ to routers $P$ and $Q$. Assume that $R$ does not initially ... a packet from $R$ to $P$ is $Y$ The next hop router for a packet from $R$ to $Q$ is $Z$

Arjun asked in Computer Networks Feb 18

by Arjun

1.1k views

7 votes

2 answers

29

GATE CSE 2021 Set 2 | Question: 54
Consider a network using the pure $\text{ALOHA}$ medium access control protocol, where each frame is of length $1,000$ bits. The channel transmission rate is $1$ Mbps ($=10^6$ bits per second). The aggregate number ... the average number of frames successfully transmitted per second. The throughput of the network (rounded to the nearest integer) is ______________

Arjun asked in Computer Networks Feb 18

by Arjun

2.7k views

4 votes

4 answers

30

GATE CSE 2021 Set 1 | Question: 8
Consider the following two statements. $S_1$: Destination $\text{MAC}$ address of an $\text{ARP}$ reply is a broadcast address. $S_2$: Destination $\text{MAC}$ address of an $\text{ARP}$ request is a broadcast address. Which one of the following choices is ... true $S_1$ is true and $S_2$ is false $S_1$ is false and $S_2$ is true Both $S_1$ and $S_2$ are false

Arjun asked in Computer Networks Feb 18

by Arjun

2.1k views

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