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Recent questions and answers in Computer Networks

30 votes
6 answers
1
GATE CSE 2015 Set 1 | Question: 53
Suppose that the stop-and-wait protocol is used on a link with a bit rate of $64$ $\text{kilobits}$ per second and $20$ $\text{milliseconds}$ propagation delay. Assume that the transmission time for the acknowledgment and the processing time ... . Then the minimum frame size in bytes to achieve a link utilization of at least $50$ $\text{%}$ is_________________.
Suppose that the stop-and-wait protocol is used on a link with a bit rate of $64$ $\text{kilobits}$ per second and $20$ $\text{milliseconds}$ propagation delay. Assume that the transmission time for the acknowledgment and the processing time at nodes are negligible. Then the minimum frame size in bytes to achieve a link utilization of at least $50$ $\text{%}$ is_________________.
answered 1 day ago in Computer Networks varunrajarathnam 15k views
24 votes
7 answers
2
GATE CSE 1994 | Question: 9
Following $7$ ... that at most $1$ bit could be corrupted). If the message contains an error find the bit which is erroneous and gives correct message.
Following $7$ ... (assuming that at most $1$ bit could be corrupted). If the message contains an error find the bit which is erroneous and gives correct message.
answered 2 days ago in Computer Networks Yawar Rmir 4.4k views
1 vote
1 answer
3
Subnets
Given an IP address 156.233.42.56 with a subnet mask of 7 bits. How many hosts and Subnets are Possible ? 126 hosts and 510 subnet 128 host and 512 subnet 510 hosts and 126 subnet 512 hosts and 128 Subnet
Given an IP address 156.233.42.56 with a subnet mask of 7 bits. How many hosts and Subnets are Possible ? 126 hosts and 510 subnet 128 host and 512 subnet 510 hosts and 126 subnet 512 hosts and 128 Subnet
answered 4 days ago in Computer Networks rish1602 926 views
1 vote
3 answers
4
Subnet Address
For a Class C network. If IP address of a computer is 200.99.39.112 and subnet mask is 255.255.255.224,the decimal value of last octet of last host of sixth subnet is ?
For a Class C network. If IP address of a computer is 200.99.39.112 and subnet mask is 255.255.255.224,the decimal value of last octet of last host of sixth subnet is ?
answered 4 days ago in Computer Networks rish1602 587 views
4 votes
3 answers
5
6th host in class C IP address
For a class C network if IP address of a computer is 200.99.39.112 and subnet mask is 255.255.255.224 the decimal value of last octet of last host of sixth subnet is __________ According to me, the answer should be 101 11110 = 190. Because first subnet will have 000, so sixth subnet should have 101. But the answer given is: 110 11110
For a class C network if IP address of a computer is 200.99.39.112 and subnet mask is 255.255.255.224 the decimal value of last octet of last host of sixth subnet is __________ According to me, the answer should be 101 11110 = 190. Because first subnet will have 000, so sixth subnet should have 101. But the answer given is: 110 11110
answered 4 days ago in Computer Networks rish1602 723 views
19 votes
5 answers
6
GATE CSE 2005 | Question: 27
An organization has a class $B$ network and wishes to form subnets for $64$ departments. The subnet mask would be: $255.255.0.0$ $255.255.64.0$ $255.255.128.0$ $255.255.252.0$
An organization has a class $B$ network and wishes to form subnets for $64$ departments. The subnet mask would be: $255.255.0.0$ $255.255.64.0$ $255.255.128.0$ $255.255.252.0$
answered Jun 15 in Computer Networks varunrajarathnam 17k views
2 votes
2 answers
7
A router has 3 interfaces and connects 3 subnets in a 200.200.200 network with given subnet mask of interfaces .
Interface $A - 255.255.255.128$ Interface $B -255.255.255.192$ Interface $C -255.255.255.224$ 1) which one of the following IP addresses belong to interface $B$ ? $200.200.200.130$ & $200.200.200.157$ $200.200.200.200$ & $200.200.200.205$ $200.200.200.30$ ... 2) Based on the subnet masks above , what could be the maximum number of possible subnets in the network $200.200.200$ ? $2$ $4$ $8$ $3$
answered Jun 12 in Computer Networks rish1602 458 views
2 votes
2 answers
8
IP addressing
Consider the following IP address with corresponding subnet mask: IP add: 172.60.50.2 Subnet mask: 255.255.224.0 What is the range of assignable IP addresses on the subnet on which the host belongs: a) 172.60.30.0 - 172.60.63.255 b)172.60.32.1 - 172.60.63.254 c)172.60.32.1 -172.60.64.255 d)172.60.32.0 - 172.60.127.254
Consider the following IP address with corresponding subnet mask: IP add: 172.60.50.2 Subnet mask: 255.255.224.0 What is the range of assignable IP addresses on the subnet on which the host belongs: a) 172.60.30.0 - 172.60.63.255 b)172.60.32.1 - 172.60.63.254 c)172.60.32.1 -172.60.64.255 d)172.60.32.0 - 172.60.127.254
answered Jun 12 in Computer Networks rish1602 1.1k views
1 vote
4 answers
9
Subnet addresses
A class B network address 130.50.0.0 is submitted as follows. The last 10 bits of the host id are allotted for host number and the remaining 6 bits are reserved for subnet number. How many subnets and number of hosts in each subnet are possible with above scheme ? 62,1022 30,510 14,254 ... 130.50.4.1 and 130.50.16.1 130.50.1.1 and 130.50.4.1 130.50.0.0 and 130.50.3.0 None of these
A class B network address 130.50.0.0 is submitted as follows. The last 10 bits of the host id are allotted for host number and the remaining 6 bits are reserved for subnet number. How many subnets and number of hosts in each subnet are possible with above scheme ? 62,1022 30,510 14,254 None of these ... ? 130.50.4.1 and 130.50.16.1 130.50.1.1 and 130.50.4.1 130.50.0.0 and 130.50.3.0 None of these
answered Jun 12 in Computer Networks rish1602 892 views
1 vote
3 answers
11
tcp congestion control
i have a self doubt that till now i solve the TCP question where the sender has $1\hspace{0.1cm}mss$ at starting so during time out generally reduced the senders window size to $1 \hspace{0.1cm}mss$ ... sender size i.e we will put it down to $1 \hspace{0.1cm}mss$ or to $2\hspace{0.1cm}mss$ .........
i have a self doubt that till now i solve the TCP question where the sender has $1\hspace{0.1cm}mss$ at starting so during time out generally reduced the senders window size to $1 \hspace{0.1cm}mss$ ... be the sender size i.e we will put it down to $1 \hspace{0.1cm}mss$ or to $2\hspace{0.1cm}mss$ .........
answered Jun 10 in Computer Networks rish1602 335 views
3 votes
2 answers
12
TCP - Stanford Lectures
In one of the quizes, they asked the following question : "A server typically listens for TCP connections on a particular port (e.g. 80 for HTTP or 22 for SSH). Which fields can the server use to distinguish packets for a particular ... address from the packet received from the client... (After all, this destination IP address corresponds to the Server itself !).
In one of the quizes, they asked the following question : "A server typically listens for TCP connections on a particular port (e.g. 80 for HTTP or 22 for SSH). Which fields can the server use to distinguish packets for a particular client connection?" Please ... IP address from the packet received from the client... (After all, this destination IP address corresponds to the Server itself !).
answered Jun 10 in Computer Networks rish1602 443 views
2 votes
5 answers
13
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 $=0$
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 message to $Q$ with a ... $\text{SEQ}$ number $=Y$, $\text{ACK}$ bit $=1$, $\text{ACK}$ number $=X$, $\text{FIN}$ bit $=0$
answered Jun 10 in Computer Networks vikashrajpoot0100 998 views
2 votes
3 answers
14
ALOHA
Is ALOHA a part of gate syllabus ?
Is ALOHA a part of gate syllabus ?
answered May 17 in Computer Networks nishant_magarde 899 views
5 votes
2 answers
15
GATE CSE 2021 Set 1 | Question: 29
Assume that a $12$-bit Hamming codeword consisting of $8$-bit data and $4$ check bits is $d_8d_7d_6d_5c_8d_4d_4d_3d_2c_4d_1c_2c_1$ ... $0$ and $y$ is $1$ $x$ is $1$ and $y$ is $0$ $x$ is $1$ and $y$ is $1$
Assume that a $12$-bit Hamming codeword consisting of $8$-bit data and $4$ check bits is $d_8d_7d_6d_5c_8d_4d_4d_3d_2c_4d_1c_2c_1$ ... is $0$ $x$ is $0$ and $y$ is $1$ $x$ is $1$ and $y$ is $0$ $x$ is $1$ and $y$ is $1$
answered May 17 in Computer Networks abhi97.dutta 2.3k views
1 vote
2 answers
16
UGCNET-Dec2006-II: 28
The network $198.78.41.0$ is a : Class A Network Class B Network Class C Network Class D Network
The network $198.78.41.0$ is a : Class A Network Class B Network Class C Network Class D Network
answered May 14 in Computer Networks Hira Thakur 202 views
0 votes
2 answers
17
NIELIT 2017 OCT Scientific Assistant A (CS) - Section B: 26
If the channel is band limited to $6\;kHz$ and signal to noise ratio is $16,$ what would be the capacity of channel? $16.15$ kbps $23.24$ kbps $40.12$ kbps $24.74$ kbps
If the channel is band limited to $6\;kHz$ and signal to noise ratio is $16,$ what would be the capacity of channel? $16.15$ kbps $23.24$ kbps $40.12$ kbps $24.74$ kbps
answered May 11 in Computer Networks Hira Thakur 268 views
6 votes
5 answers
18
ISRO2014-31
A IP packet has arrived in which the fragmentation offset value is 100,the value of HLEN is 5 and the value of total length field is 200. What is the number of the last byte? 194 394 979 1179
A IP packet has arrived in which the fragmentation offset value is 100,the value of HLEN is 5 and the value of total length field is 200. What is the number of the last byte? 194 394 979 1179
answered May 8 in Computer Networks eshita1997 6.6k views
1 vote
2 answers
19
MadeEasy Test Series 2017: Computer Networks - Ip Packet
Consider station “A” send data to station “B”. Data frame contain MAC address, IP address and port address. Which of the following address may change on intermediate router A Destination IP address B Destination MAC C Source MAC D Source IP address
Consider station “A” send data to station “B”. Data frame contain MAC address, IP address and port address. Which of the following address may change on intermediate router A Destination IP address B Destination MAC C Source MAC D Source IP address
answered May 8 in Computer Networks eshita1997 535 views
1 vote
1 answer
20
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)?
answered May 6 in Computer Networks rish1602 176 views
2 votes
1 answer
21
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 doubt 1: Segment sequence number is equal to the first sequence number of byte in TCP . Is it right ?
answered May 6 in Computer Networks rish1602 593 views
3 votes
3 answers
22
TCP Congestion control AIMD
Consider an instance of TCP's Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 2 KB and the threshold at the start of first transmission is 32 KB. Assume that 3 ... transmission and 1 duplicate ACK received during 6th transmission. what is the congestion window size at the end of 10th transmission?
Consider an instance of TCP's Additive Increase Multiplicative Decrease (AIMD) algorithm where the window size at the start of slow start phase is 2 KB and the threshold at the start of first transmission is 32 KB. Assume that 3 duplicate ACK are received ... 5th transmission and 1 duplicate ACK received during 6th transmission. what is the congestion window size at the end of 10th transmission?
answered May 6 in Computer Networks rish1602 868 views
2 votes
3 answers
23
Computer Networks
Do all the TCP segments travel through same path once the connection is established ?
Do all the TCP segments travel through same path once the connection is established ?
answered May 6 in Computer Networks rish1602 302 views
2 votes
2 answers
24
TCP acknowledgement number
An ACK number of $1000$ in TCP always means that $999$ bytes have been successfully received $1000$ bytes have been successfully received $1001$ bytes have been successfully received None of the above
An ACK number of $1000$ in TCP always means that $999$ bytes have been successfully received $1000$ bytes have been successfully received $1001$ bytes have been successfully received None of the above
answered May 6 in Computer Networks rish1602 361 views
3 votes
1 answer
25
TestBook TCP
In a TCP connection, the initial sequence number at the client site is 1846. The client opens the connection, sends only one segment carrying 1200 bytes of data, and closes the connection. What is the value of the sequence number in SYN, DATA and FIN segment sent by the client? 1200, 3046, 4246 1846, 1200, 3046 1200, 1846, 3046 1846, 3046, 3046
In a TCP connection, the initial sequence number at the client site is 1846. The client opens the connection, sends only one segment carrying 1200 bytes of data, and closes the connection. What is the value of the sequence number in SYN, DATA and FIN segment sent by the client? 1200, 3046, 4246 1846, 1200, 3046 1200, 1846, 3046 1846, 3046, 3046
answered May 6 in Computer Networks rish1602 257 views
0 votes
1 answer
26
Andrew S. Tanenbaum Edition 5th Exercise 7 Question 10 (Page No. 759)
A large law firm, which has many employees, provides a single email address for each employee. Each employee's email address is <login>@lawfirm.com. However, the firm did not explicitly define the format of the login. ... for the email addresses of all its employees. How can this be done without rocking the boat too much?
A large law firm, which has many employees, provides a single email address for each employee. Each employee's email address is <login>@lawfirm.com. However, the firm did not explicitly define the format of the login. Thus, some employees use their first names as their ... com, that can be used for the email addresses of all its employees. How can this be done without rocking the boat too much?
answered May 4 in Computer Networks Sailoki 119 views
2 votes
1 answer
27
Test Series
Say the receiver host B, has a buffer size of 4500 bytes and 1500 bytes of received and unprocessed data. If the value of congestion window is 3500 bytes then what will be the size of the window for sender host A?( Marks: -0.33 ) 3500 B 4500 ... 3000B as congestion window is 3500 B and receiver window is 4500-1500 = 3000B Can anyone please explain it in details about congestion window?
Say the receiver host B, has a buffer size of 4500 bytes and 1500 bytes of received and unprocessed data. If the value of congestion window is 3500 bytes then what will be the size of the window for sender host A?( Marks: -0.33 ) 3500 B 4500 B 4000 ... is 3000B as congestion window is 3500 B and receiver window is 4500-1500 = 3000B Can anyone please explain it in details about congestion window?
answered May 2 in Computer Networks rish1602 322 views
3 votes
3 answers
28
GATE CSE 2021 Set 1 | Question: 44
A $\text{TCP}$ server application is programmed to listen on port number $P$ on host $S$. A $\text{TCP}$ client is connected to the $\text{TCP}$ server over the network. Consider that while the $\text{TCP}$ connection was active, the ... receive a $\text{RST}$ segment If the client sends a packet after the server reboot, it will receive a $\text{FIN}$ segment
A $\text{TCP}$ server application is programmed to listen on port number $P$ on host $S$. A $\text{TCP}$ client is connected to the $\text{TCP}$ server over the network. Consider that while the $\text{TCP}$ connection was active, the server machine $S$ crashed ... it will receive a $\text{RST}$ segment If the client sends a packet after the server reboot, it will receive a $\text{FIN}$ segment
answered May 2 in Computer Networks rish1602 1.5k views
1 vote
1 answer
29
Self doubt
What does this 2nd points means wrt TCP window. We need not send complete window everytime..but we send complete window data once at a time. Right? Is it something related to PUSH flag
What does this 2nd points means wrt TCP window. We need not send complete window everytime..but we send complete window data once at a time. Right? Is it something related to PUSH flag
answered May 2 in Computer Networks rish1602 93 views
1 vote
1 answer
30
CN-TCP
When a TCP segment arrives at a host, in order to direct it to the appropriate socket, the operating system's network stack uses which of the following? (a)Transport protocol number (b)Destination IP Address (c)Source port number (d)Destination port ... a,b and d are needed. Why source port number is needed? Document Ref: https://gateoverflow.in/?qa=blob&qa_blobid=8025344419025703520
When a TCP segment arrives at a host, in order to direct it to the appropriate socket, the operating system's network stack uses which of the following? (a)Transport protocol number (b)Destination IP Address (c)Source port number (d)Destination port number ( ... why a,b and d are needed. Why source port number is needed? Document Ref: https://gateoverflow.in/?qa=blob&qa_blobid=8025344419025703520
answered May 2 in Computer Networks rish1602 360 views
2 votes
2 answers
31
# CN TCP connection establishment doubt about MSS
Say Client buffer is of 12000 Bytes and MSS is 1200 B and this info is sent to server and now server send the info in (SYN +ACK) segment as Server Buffer = 18000 B and MSS is 600 B Now in data transfer phase does both Client and ... 1200, 600) = 600 Bytes? Or does the sever will send 1200 Bytes segments to C and C sends 600 B segments to server?
Say Client buffer is of 12000 Bytes and MSS is 1200 B and this info is sent to server and now server send the info in (SYN +ACK) segment as Server Buffer = 18000 B and MSS is 600 B Now in data transfer phase does both Client and Server will choose 600 Bytes data segments ... ) = Min (1200, 600) = 600 Bytes? Or does the sever will send 1200 Bytes segments to C and C sends 600 B segments to server?
answered May 2 in Computer Networks rish1602 332 views
2 votes
1 answer
32
MadeEasy Subject Test 2019: Computer Networks - Tcp
If TCP RTT is currently 20 ms and following acknowledgement come in after 22,24 and 23 ms respectively. What is new RTT estimate ? 28.527 28.82 20.82 21.22
If TCP RTT is currently 20 ms and following acknowledgement come in after 22,24 and 23 ms respectively. What is new RTT estimate ? 28.527 28.82 20.82 21.22
answered May 2 in Computer Networks rish1602 358 views
1 vote
1 answer
33
Self doubt- TCP congestion control
When during TCP congestion control, timeout occurs in 5th transition, then shall those packets be considered as received or shall be resent? Asking for if question asks for number of transmission to send given number of packets using TCP congestion slow start phase.
When during TCP congestion control, timeout occurs in 5th transition, then shall those packets be considered as received or shall be resent? Asking for if question asks for number of transmission to send given number of packets using TCP congestion slow start phase.
answered May 2 in Computer Networks rish1602 177 views
5 votes
3 answers
34
GATE CSE 2021 Set 1 | Question: 45
Consider two hosts $P$ and $Q$ connected through a router $R$. The maximum transfer unit $\text{(MTU)}$ value of the link between $P$ and $R$ is $1500$ bytes, and between $R$ and $Q$ is $820$ bytes. A $\text{TCP}$ segment ... to resend the whole $\text{TCP}$ segment. $\text{TCP}$ destination port can be determined by analysing $\textit{only}$ the second fragment.
Consider two hosts $P$ and $Q$ connected through a router $R$. The maximum transfer unit $\text{(MTU)}$ value of the link between $P$ and $R$ is $1500$ bytes, and between $R$ and $Q$ is $820$ bytes. A $\text{TCP}$ segment of size $1400$ bytes ... is required to resend the whole $\text{TCP}$ segment. $\text{TCP}$ destination port can be determined by analysing $\textit{only}$ the second fragment.
answered May 2 in Computer Networks rish1602 1.3k views
4 votes
2 answers
36
Distance vector
In distance vector routing how the distance vectors are update when two paths have same cost eg. Initial Distance vector of A B C D are A- [0 &infin; 1 2] B- [&infin; 0 3 2] C- [1 3 0 &infin;] D- [2 2 &infin; 0] what will be distance vector of A after 1 iteration. Please mention via node and why u choose that node??
In distance vector routing how the distance vectors are update when two paths have same cost eg. Initial Distance vector of A B C D are A- [0 &infin; 1 2] B- [&infin; 0 3 2] C- [1 3 0 &infin;] D- [2 2 &infin; 0] what will be distance vector of A after 1 iteration. Please mention via node and why u choose that node??
answered Apr 9 in Computer Networks rish1602 696 views
4 votes
3 answers
37
Virtual Gate Test Series: Computer Networks - Distance Vector Routing Algorithm
Consider a router is working based on the Distance Vector Routing Algorithm. Consider the five-node network of the following figure. Assume all nodes building distance from that node to $A$ (number of hops) and after initial set up, suddenly either $A$ goes down ... $(C) B - 4, C - 5, D - 4, E - 5$ $(D)$ None
Consider a router is working based on the Distance Vector Routing Algorithm. Consider the five-node network of the following figure. Assume all nodes building distance from that node to $A$ (number of hops) and after initial set up, suddenly either $A$ goes down or the link between $A$ and $B$ is cut. What are the distance ... $(C) B - 4, C - 5, D - 4, E - 5$ $(D)$ None
answered Apr 9 in Computer Networks rish1602 690 views
1 vote
2 answers
38
distance vector routing query
Consider a network system having 4 routers P,Q,R AND S as shownbelow.initially, the routersise Distance vector routing and use number of hops as distance metric. Initially, link p-q was down and all other routers agree p is unreachable.thr ... "count to infinity" problem as all routers are sending the information at the same instant. How to solve this ques?
Consider a network system having 4 routers P,Q,R AND S as shownbelow.initially, the routersise Distance vector routing and use number of hops as distance metric. Initially, link p-q was down and all other routers agree p is unreachable.thr link p-q comes back up. ... will not be "count to infinity" problem as all routers are sending the information at the same instant. How to solve this ques?
answered Apr 9 in Computer Networks rish1602 1.1k views
0 votes
5 answers
39
UGCNET-Jan2017-III: 26
Station $A$ uses $32$ byte packets t transmit messages to station $B$ using sliding window protocol. The round trip delay between $A$ and $B$ is $40$ milliseconds and the bottleneck bandwidth on the path between $A$ and $B$ is $64$ kbps. The optimal window size of $A$ is $20$ $10$ $30$ $40$
Station $A$ uses $32$ byte packets t transmit messages to station $B$ using sliding window protocol. The round trip delay between $A$ and $B$ is $40$ milliseconds and the bottleneck bandwidth on the path between $A$ and $B$ is $64$ kbps. The optimal window size of $A$ is $20$ $10$ $30$ $40$
answered Apr 5 in Computer Networks heisenberggg 464 views
1 vote
3 answers
40
UGCNET-Jan2017-III: 25
Suppose there are $n$ stations in a slotted $LAN$. Each station attempts to transmit with a probability $P$ in each time slot. The probability that only one station transmits in a given slot is $nP(1-P)^{n-1}$ $nP$ $P(1-P)^{n-1}$ $n^{P}(1-P)^{n-1}$
Suppose there are $n$ stations in a slotted $LAN$. Each station attempts to transmit with a probability $P$ in each time slot. The probability that only one station transmits in a given slot is $nP(1-P)^{n-1}$ $nP$ $P(1-P)^{n-1}$ $n^{P}(1-P)^{n-1}$
answered Apr 5 in Computer Networks heisenberggg 339 views
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