Recent questions and answers in Computer Networks - GATE CSE Doubts

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ICMP echo reply request
An ICMP Echo Request and Reply can be used to determine if we have connectivity between a client and server at the Application Layer level? Is it False,right ? ping command is used to check for connectivity at network layer ?

answered 2 days ago in Computer Networks by GAITONDE (1.2k points) | 11 views

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Made Easy test series 2020 computer network question

asked 2 days ago in Computer Networks by vishal burnwal (9 points) | 23 views

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Made Easy Test series Computer Network 2020
In RSA algorithm the number of keys required to support both confidentiality and authentication are ________. Ans: 4 Can someone plz explain ,how the answer is 4?

answered 2 days ago in Computer Networks by GAITONDE (1.2k points) | 20 views

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Self doubt ( subnetting)
If we are given number of subnet bits = 3, then number of subnets possible will be 6 or 8? It is very confusing. Somewhere it is given 6 and somewhere it is mentioned that we can use all the 8. Please clarify.

asked 2 days ago in Computer Networks by chandrikabhuyan8 (92 points) | 23 views

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Subnetting and classful addressing
What is the subnet address of the IP address 192.168.5.55 with a subnet mask of 255.255.255.224 ? Is it 192.168.5.32 ??

asked 3 days ago in Computer Networks by s_dr_13 (10 points) | 11 views

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2 answers

Virtual GATE: Networking
$140.30.24.0$ $140.30.25.0$ $140.30.26.0$ $140.30.27.0$ Regarding the following IP addresses, which of the following is true? (A) Supernetting is possible for all four ip addresses (B) Only some cases supernetting is possible (C) Supernetting ... cases I thought answer as A), but answer given supernetting not possible. But why? I am not getting reason for it. Plz reply.

answered 5 days ago in Computer Networks by Amal (23 points) | 20 views

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Ace test series CN 2020
in which application layer protocol , server closes the connection immediately after servicing request from client. HTTP FTP Both a & b None the answer is given as HTTP and the reason is given as it is stateless and FTP is statefull, i have a doubt here HTTP 1.1 is persistent connection, so how come HTTP is right answer or is there anything that i’m missing out.

answered Oct 15 in Computer Networks by GAITONDE (1.2k points) | 20 views

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GATE GURU COMPUTER NETWORKS: SECURITY
In a _____ attack, an intruder comes between two communicating parties, intercepting and replying to their messages. Man in the middle Replay Quarantine None

answered Oct 10 in Computer Networks by GAITONDE (1.2k points) | 37 views

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asked Oct 8 in Computer Networks by Debapaul (123 points) | 11 views

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CN sequence number doubt
Suppose if the sequence number of a segment is 200 and that segment contains (let say) 10 bytes. Then, Ack send back by receiver is 210 and the next sequence number of the next segment is 210. isn't ? So sequence number 201 to 209 is unused ?

asked Oct 5 in Computer Networks by Amal (23 points) | 16 views

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Slotted aloha
The probabilities of generation of frame in a time slot by station s1,s2,s3,s4 are 0.1 , 0.2 , 0.3, 0.4 resp. Suppose there are 4 time slots then what is the probability that the s1,s2,s3,s4 will carry out transmission without any collision in all the four slots?

asked Oct 3 in Computer Networks by Nandkishor3939 (6 points) | 12 views

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MADE EASY CN GATE 2020 TARGET AIR 1

answered Sep 30 in Computer Networks by Amal (23 points) | 35 views

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CN-doubt_ Packet Broadcasting
We use destination ip address as 255.255.255.255 for broadcasting a packet in the network itself. Then what will be the destination MAC address of that broadcast packet?

asked Sep 30 in Computer Networks by Amal (23 points) | 11 views

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Fragmentation (ACE test series)

asked Sep 30 in Computer Networks by Priyansh Singh (41 points) | 23 views

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fragmentation (ace academy test series)

asked Sep 30 in Computer Networks by Priyansh Singh (41 points) | 10 views

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fragmentation (test series ace )

asked Sep 30 in Computer Networks by Priyansh Singh (41 points) | 7 views

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Confusion regarding the terms-CN
I am having a confusion regarding the terms: Effective bandwidth,throughput ,bottleneck bandwidth. I know that effective bandwidth is same as throughtput. but does bottleneck bandwidth refer to the same think as throughput? please help:)

asked Sep 30 in Computer Networks by Doraemon (69 points) | 16 views

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Self doubt on sliding window protocol
In sliding window ,we have distinct sequence now for each frame to be send in window ,now suppose max no of packets that we can send in rtt = 100 ,and we use no of sequence bits =6 means sequence nos are 64 ,so according to definition window ... if we got 2 frames with same sequence no but they are not coming at a time so why receiver is having problem with it?

asked Sep 29 in Computer Networks by Winner (21 points) | 9 views

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ACE Academy test series 2019 CN
In Public Key Cryptography encryption can be performed by (a) Public key only (b) Private key only c) Either (a) or (b) (d) Neither (a) nor (b)

answered Sep 23 in Computer Networks by GAITONDE (1.2k points) | 12 views

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Slinding Window Protocol
In the sliding window protocol, assume a 3-bit sequence number field. A and B have windows, which has 3-bit sequence number.If A sends 3-frame and waits for all the three frames acknowledgements until timer expires. Which of the following could not be the ... receiver receives all the three frames correctly. But ACK's sent by receivers may be lost. a)4 b)7 c)6 d)5

asked Sep 21 in Computer Networks by indrani_sharma (6 points) | 16 views

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Network - Packet Queuing
Every Sec, 100 bit packet arrives to a queue at a rate of 1000 b/s. The maximum departure rate is 500 b/s. What is the average bit occupancy of the queue ? My answer Queue fills in 0.1 sec ($\frac{100 bit}{1000 bit/sec}$ ... is empty for the remaining 0.8 sec . So average occupancy is (50 x 0.2) + (0 x 0.8) = 10 Bit Is this is correct?

asked Sep 20 in Computer Networks by Amal (23 points) | 8 views

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2 answers

What is the default maximum packet size for 16 MB token ring network

answered Sep 18 in Computer Networks by Bikram (1.2k points) | 6 views

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Self Doubt (Computer Network)
ARP is used at which layer ?

answered Sep 17 in Computer Networks by GAITONDE (1.2k points) | 10 views

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Ugcnet june 2013
In hierarchical routing with 4800 routers. What region and cluster sizes should be chosen to minimize the size of the routing table for a three layer hierarchy [closed]

asked Sep 16 in Computer Networks by Vaani12 (6 points) | 5 views

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computer network self doubt switches
I am confuse that if we are given 2 host A and B connected through switch C . A->C bandwidth is X Mbps and C->B bandwidth is Y Kbps. so what we will use as effective bandwidth , because there is a concept of bottel neck bandwidth in which ... .in/8495/gate2015-3-36) if A->C and C->B bandwidth were different what changes we would make in our soln????

asked Sep 13 in Computer Networks by crazysarth (6 points) | 6 views

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CSMA/CD self doubt
https://gateoverflow.in/96569/csma-cd Here in the solution why Data size is taken excluding header and acknowledgement

answered Sep 12 in Computer Networks by Bikram (1.2k points) | 10 views

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SELF DOUBT FLOW CONTROL
FLOW CONTROL CAN LEADS TO CONGESTION CONTOL? CONGESTION CONTROL CAN LEADS TO FLOW CONTROL?

asked Sep 12 in Computer Networks by eyeamgj (9 points) | 6 views

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GATE GURU TEST COMPUTER NETWORKS
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

answered Sep 11 in Computer Networks by Bikram (1.2k points) | 8 views

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MADE EASY 2020 CN

asked Sep 11 in Computer Networks by GAITONDE (1.2k points) | 8 views

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MADE EASY SUBJECT WISE CN
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 by GAITONDE (1.2k points) | 6 views

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MADE EASY CN SELF DOUBT
Ans should be 2 right?

asked Sep 11 in Computer Networks by GAITONDE (1.2k points) | 7 views

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MADE EASY CN: GATE 2020
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. ... 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?

answered Sep 10 in Computer Networks by Bikram (1.2k points) | 10 views

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MADE EASY CN: gate 2020 mock
Both A and C should be ans right?

asked Sep 10 in Computer Networks by GAITONDE (1.2k points) | 7 views

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MADE EASY COMPUTER NETWORK 2020 TEST
Question: 11 Assume a datagram of length $5*10^3$ bytes needs to pass through five networks to reach its destination. The MTU's of each network is 1000, 820, 850, 950 and 900 respectively. Then at destination how many datagrams have to ... the datagram based on the smallest MTU is not even possible in case of IPv4, this feature is included in IPv6 only.

asked Sep 10 in Computer Networks by GAITONDE (1.2k points) | 6 views

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MADE EASY : COMPUTER NETWORK 101
Which of the following are true regarding the distance-vector and link-state routing protocols? 1. Link state sends its complete routing table out all active interfaces on periodic time intervals. 2. Distance vector sends its complete routing table out all active interfaces ... the state of its own links to all routers in the internetwork. 1 only 2 and 3 1,3 1,3,4

asked Sep 10 in Computer Networks by GAITONDE (1.2k points) | 4 views

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Need of both connectionless and connection oriented service in transport layer

asked Sep 10 in Computer Networks by spsahu (6 points) | 9 views

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Tanenbaum Hamming Code
To provide more reliability than a single parity bit can give,an error-detecting coding scheme uses one parity bit for checking all the odd-numbered bits and a second parity bit for all the even-numbered bits. What is the hamming distance of ... https://gateoverflow.in/85928/hamming-code But i didn't found the answer satisfactory Can someone explain in details with example

asked Sep 9 in Computer Networks by aditi19 (44 points) | 12 views

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MADE EASY CN 2020
Note→ MULTIPLE OPTIONS CORRECT

asked Sep 9 in Computer Networks by GAITONDE (1.2k points) | 7 views

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Self Doubt: Made Easy Question Bank
Question: 4 Find INCORRECT statement with respect to SWS (Silly Window Syndrome) avoidance S1: Receiver should not advertise small windows. S2: Sender should avoid sending small segments. S1 only S2 only Both None of the above

asked Sep 9 in Computer Networks by GAITONDE (1.2k points) | 6 views

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#SlidingWindowARQ
consider a system that use sliding window ARQ and sliding window flow control. Assume that the sending window size is 7 frames. Consider an instant in time when the sender has sent out frames with sequence number 0 through 6 and it has received an ... is 5 frames . When the sender receives this acknowledgement with flow window indication, how many more frames can the sender send?

answered Sep 9 in Computer Networks by jothee (13 points) | 10 views

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