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Recent questions and answers in Computer Networks

0 votes
2 answers
3
Consider sliding window protocol for a 10 MBps point to point link with propagation delay of 2 sec. If frame size is of 4kB then what wil be the minimum number of bits number required for the sequence number? Which approach to take and why? Notice the difference in frame numbers, why does this arise and which one is correct. The answer is not affected in this question.
answered 5 hours ago in Computer Networks abhishek tiwary 1.3k views
2 votes
2 answers
4
Suppose an IP packet has been fragmented. Then which of the following is a set of fragments?   A) 128, 56, 84, 42 B) 372, 408, 12, 56 C) 248, 72, 120, 18 D) 48, 88, 70, 52
answered 5 hours ago in Computer Networks abhishek tiwary 246 views
0 votes
2 answers
5
In stop and wait protocol , every 4th packet is lost.If 8 packets are being sent, Find number of packets ? Answer given is : 10 Shouldn't Acknowledgements considered as well , in such case answer should be 18 , Right ?
answered 5 hours ago in Computer Networks abhishek tiwary 506 views
0 votes
2 answers
7
0 votes
1 answer
9
58 votes
7 answers
10
A router has two full-duplex Ethernet interfaces each operating at $100$ $\text{Mb/s}$. Ethernet frames are at least $84$ $\text{bytes}$ long (including the Preamble and the Inter-Packet-Gap). The maximum packet processing time at the router for wirespeed forwarding to be possible is (in micro­seconds) $0.01$ $3.36$ $6.72$ $8$
answered 5 days ago in Computer Networks gatecse 7.7k views
55 votes
9 answers
11
Every host in an IPv4 network has a $1-second$ resolution real-time clock with battery backup. Each host needs to generate up to $1000$ unique identifiers per second. Assume that each host has a globally unique IPv4 address. Design a $50-bit$ globally unique ID for this purpose. After what period (in seconds) will the identifiers generated by a host wrap around?
answered 5 days ago in Computer Networks gatecse 9.9k views
1 vote
2 answers
12
If the TCP round-trip time, RTT, is currently 30 msec and the following acknowledgements come in after 26, 32, and 24 msec, respectively, what is the new RTT estimate using the Jacobson algorithm? Use α = 0.9.
answered 6 days ago in Computer Networks kalin 209 views
1 vote
2 answers
13
Consider a TCP connection between two machines (A and B) in an environment with 0% packet loss. Assume the round trip time (RTT) between the two machines is 4 [seconds], and the segment size is 3 [Kbytes]. The bandwidth of the connection is 500 [kbps]. What is the ... buffer close to zero. I.e., TCP packets are continuously, back-to-back, sent out of the sender before the first ack arrives back.)
answered Oct 21 in Computer Networks kalin 166 views
1 vote
1 answer
14
Consider a scnario of CSMA/CD network. Suppose A & B attempt to transmit a frame simultaneously and collide. Using exponential backoff algorithm A chooses K=0 and B chooses K=1. Again they collide and after the 2nd collision both A & B will choose K with equal probability from set: For A {0,1} and for B {0,1} For ... for B {0,1} For A {0,1} and for B {0,1,2,3} For A {0,1,2,3} and for B {0,1,2,3}
answered Oct 20 in Computer Networks anwesha-me 164 views
17 votes
6 answers
15
Determine the maximum length of the cable (in km) for transmitting data at a rate of $500$ Mbps in an Ethernet LAN with frames of size $10,000$ bits. Assume the signal speed in the cable to be $2,00,000$ km/s. $1$ $2$ $2.5$ $5$
answered Oct 9 in Computer Networks adityaravishankar28 7.3k views
37 votes
6 answers
16
Consider a $128 \times 10^3$ bits/second satellite communication link with one way propagation delay of $150$ milliseconds. Selective retransmission (repeat) protocol is used on this link to send data with a frame size of $1$ kilobyte. Neglect the transmission time of acknowledgement. The minimum number of bits required for the sequence number field to achieve $100 \%$ utilization is ________.
answered Oct 5 in Computer Networks shetu_raj 9.6k views
0 votes
2 answers
17
In CRC, if the degree of Generator polynomial is n, then the number of bits in divisor is?
answered Oct 5 in Computer Networks s_dr_13 416 views
1 vote
5 answers
18
Given a mask, M=255.255.255.248. How many subnet bits are required for given mask M? (A) 2 (B) 3 (C) 4 (D)5
asked Jul 18 in Computer Networks Sanjay Sharma 446 views
0 votes
1 answer
19
0 votes
1 answer
21
What are the primary characteristics that distinguish a cell from a packet? cells are generally smaller that packets cells do not incorporate physical address all cells have the same fixed length packet cannot be switched
asked Apr 2 in Computer Networks Lakshman Patel RJIT 44 views
0 votes
1 answer
22
0 votes
2 answers
24
Bit stuffing refers to Inserting a $’0’$ in user data stream to differentiate it with a flag Inserting a $’0’$ in flag stream to avoid ambiguity Appending a nibble to the flag sequence Appending a nibble to the user data stream
asked Apr 1 in Computer Networks Lakshman Patel RJIT 174 views
0 votes
1 answer
25
The address of a class $B$ Host is to be split into subnets with a $3$-bit subnet number. What is the maximum number of subnets and maximum number of hosts in each subnet? $8$ subnets and $262142$ hosts $6$ subnets and $262142$ hosts $6$ subnets and $1022$ hosts $8$ subnets and $1024$ hosts
asked Apr 1 in Computer Networks Lakshman Patel RJIT 111 views
0 votes
2 answers
29
Bit stuffing refers to Inserting a $’0’$ in user data stream to differentiate it with a flag Inserting a $’0’$ in flag stream to avoid ambiguity Appending a nibble to the flag sequence Appending a nibble to the user data stream
asked Apr 1 in Computer Networks Lakshman Patel RJIT 81 views
0 votes
1 answer
30
0 votes
2 answers
31
Correct expression tor UDP user datagram length is length of UDP = length of IP- length of IP header's length of UDP= length of UDP-length of UDP header's length of UDP = length of IP+length of IP header's length of UDP = length of UDP+length of UDP header's
asked Mar 31 in Computer Networks Lakshman Patel RJIT 241 views
0 votes
1 answer
32
0 votes
1 answer
34
0 votes
2 answers
35
0 votes
1 answer
37
1 vote
1 answer
39
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