Concept of layering.OSI and TCP/IP Protocol Stacks; Basics of packet, circuit and virtual circuit-switching; Data link layer: framing, error detection, Medium Access Control, Ethernet bridging; Routing protocols: shortest path, flooding, distance vector and link state routing; Fragmentation and IP addressing, IPv4, CIDR notation, Basics of IP support protocols (ARP, DHCP, ICMP), Network Address Translation (NAT); Transport layer: flow control and congestion control, UDP, TCP, sockets; Application layer protocols: DNS, SMTP, HTTP, FTP, Email.

.$$\scriptsize{\overset{{\large{\textbf{Mark Distribution in Previous GATE}}}}{\begin{array}{|c|c|c|c|c|c|c|c|}\hline
\textbf{Year}& \textbf{2022} & \textbf{2021-1}&\textbf{2021-2}&\textbf{2020}&\textbf{2019}&\textbf{2018}&\textbf{2017-1}&\textbf{2017-2}&\textbf{2016-1}&\textbf{2016-2}&\textbf{Minimum}&\textbf{Average}&\textbf{Maximum}
\\\hline\textbf{1 Mark Count} & 2 &1&1&2&1&3&2&3&2&3&1&2&3
\\\hline\textbf{2 Marks Count} & 4 &4&3&2&4&2&3&1&4&3&1&3&4
\\\hline\textbf{Total Marks} & 10 &9&7&6&9&7&8&5&10&9&\bf{5}&\bf{8}&\bf{10}\\\hline
\end{array}}}$$

Recent questions in Computer Networks

64 votes

6 answers

4641

GATE CSE 2009 | Question: 48
Let $G(x)$ be the generator polynomial used for CRC checking. What is the condition that should be satisfied by $G(x)$ to detect odd number of bits in error? $G(x)$ contains more than two terms $G(x)$ does not divide $1+x^k$, for any $k$ not exceeding the frame length $1+x$ is a factor of $G(x)$ $G(x)$ has an odd number of terms.

Let $G(x)$ be the generator polynomial used for CRC checking. What is the condition that should be satisfied by $G(x)$ to detect odd number of bits in error?$G(x)$ contai...

29.3k views

Kathleen asked Sep 22, 2014

86 votes

7 answers

4642

GATE CSE 2009 | Question: 47
While opening a $TCP$ connection, the initial sequence number is to be derived using a time-of-day (ToD) clock that keeps running even when the host is down. The low order $32$ bits of the counter of the ToD clock is to be used for the initial sequence numbers ... sequence numbers used for packets of a connection can increase? $0.015$/s $0.064$/s $0.135$/s $0.327$/s

While opening a $TCP$ connection, the initial sequence number is to be derived using a time-of-day (ToD) clock that keeps running even when the host is down. The low orde...

25.4k views

Kathleen asked Sep 22, 2014

21 votes

3 answers

4643

GATE CSE 2009 | Question: 46
In the RSA public key cryptosystem, the private and public keys are $(e, n)$ and $(d, n)$ respectively, where $n=p \times q$ and $p$ and $q$ are large primes. Besides, $n$ is public and $p$ and $q$ are private. Let $M$ be an integer ... Which of the above equations correctly represents RSA cryptosystem? I and II I and III II and IV III and IV

In the RSA public key cryptosystem, the private and public keys are $(e, n)$ and $(d, n)$ respectively, where $n=p \times q$ and $p$ and $q$ are large primes. Besides, $n...

7.5k views

Kathleen asked Sep 22, 2014

27 votes

4 answers

4644

GATE CSE 2007 | Question: 70
Match the following: ... $\text{P - 1, Q - 4, R - 2, S - 5}$ $\text{P - 2, Q - 4, R - 1, S - 3}$

Match the following:$$\begin{array}{llll} \text{(P)} & \text{SMTP} &(1)& \text{Application layer} \\ \text{(Q)} & \text{BGP}& (2) & \text{Transport layer} \\ \text{(R)}...

13.9k views

Kathleen asked Sep 21, 2014

56 votes

10 answers

4645

GATE CSE 2007 | Question: 69
The distance between two stations $M$ and $N$ is $L$ kilometers. All frames are $K$ bits long. The propagation delay per kilometer is $t$ seconds. Let $R$ bits/second be the channel capacity. Assuming that the processing delay is negligible, the $\text{minimum}$ number ... $\lceil \log_2 \frac{2LtR +K}{K} \rceil$ $\lceil \log_2 \frac{2LtR +2K}{2K} \rceil$

The distance between two stations $M$ and $N$ is $L$ kilometers. All frames are $K$ bits long. The propagation delay per kilometer is $t$ seconds. Let $R$ bits/second be ...

18.2k views

Kathleen asked Sep 21, 2014

27 votes

4 answers

4646

GATE CSE 2007 | Question: 68, ISRO2016-73
The message $11001001$ is to be transmitted using the CRC polynomial $x^3 +1$ to protect it from errors. The message that should be transmitted is: $11001001000$ $11001001011$ $11001010$ $110010010011$

The message $11001001$ is to be transmitted using the CRC polynomial $x^3 +1$ to protect it from errors. The message that should be transmitted is:$11001001000$$110010010...

34.0k views

Kathleen asked Sep 21, 2014

60 votes

13 answers

4647

GATE CSE 2007 | Question: 67, ISRO2016-72
The address of a class $\text{B}$ host is to be split into subnets with a $6\;\text{-bit}$ subnet number. What is the maximum number of subnets and the maximum number of hosts in each subnet? $62$ subnets and $262142$ hosts. $64$ subnets and $262142$ hosts. $62$ subnets and $1022$ hosts. $64$ subnets and $1024$ hosts.

The address of a class $\text{B}$ host is to be split into subnets with a $6\;\text{-bit}$ subnet number. What is the maximum number of subnets and the maximum number of ...

35.8k views

Kathleen asked Sep 21, 2014

11 votes

1 answer

4648

GATE CSE 2007 | Question: 66, ISRO2016-71
In a token ring network the transmission speed is $10^7$ bps and the propagation speed is $200\;\text{meters}/\mu \text{s}.$ The $1$-bit delay in this network is equivalent to: $500$ meters of cable. $200$ meters of cable. $20$ meters of cable. $50$ meters of cable.

In a token ring network the transmission speed is $10^7$ bps and the propagation speed is $200\;\text{meters}/\mu \text{s}.$ The $1$-bit delay in this network is equivale...

17.1k views

Kathleen asked Sep 21, 2014

32 votes

7 answers

4649

GATE CSE 2007 | Question: 65
There are $n$ stations in slotted LAN. Each station attempts to transmit with a probability $p$ in each time slot. What is the probability that ONLY one station transmits in a given time slot? $np(1-p)^{n-1}$ $(1-p)^{n-1}$ $p(1-p)^{n-1}$ $1-(1-p)^{n-1}$

There are $n$ stations in slotted LAN. Each station attempts to transmit with a probability $p$ in each time slot. What is the probability that ONLY one station transmits...

14.0k views

Kathleen asked Sep 21, 2014

30 votes

5 answers

4650

GATE CSE 2007 | Question: 20
Which one of the following uses UDP as the transport protocol? HTTP Telnet DNS SMTP

Which one of the following uses UDP as the transport protocol?HTTPTelnetDNSSMTP

12.3k views

Kathleen asked Sep 21, 2014

16 votes

3 answers

4651

GATE CSE 2007 | Question: 19
In Ethernet when Manchester encoding is used, the bit rate is: Half the baud rate Twice the baud rate Same as the baud rate None of the above

In Ethernet when Manchester encoding is used, the bit rate is:Half the baud rateTwice the baud rateSame as the baud rateNone of the above

11.7k views

Kathleen asked Sep 21, 2014

66 votes

3 answers

4652

GATE CSE 2004 | Question: 56
Consider three IP networks $A, B$ and $C$. Host $H_A$ in network $A$ sends messages each containing $180$ bytes of application data to a host $H_C$ in network $C$. The $\text{TCP}$ layer prefixes $20$ byte header to the message. This passes ... $200$ $220$ $240$ $260$

Consider three IP networks $A, B$ and $C$. Host $H_A$ in network $A$ sends messages each containing $180$ bytes of application data to a host $H_C$ in network $C$. The $\...

23.2k views

Kathleen asked Sep 18, 2014

52 votes

5 answers

4653

GATE CSE 2004 | Question: 55
The routing table of a router is shown below: ... $192.12.17.10$ respectively? Eth$1$ and Eth$2$ Eth$0$ and Eth$2$ Eth$0$ and Eth$3$ Eth$1$ and Eth$3$

The routing table of a router is shown below:$$\begin{array}{|l|l|l|} \hline \textbf {Destination} & \textbf {Subnet Mask} & \textbf{Interface} \\\hline \text {128.75.4...

17.5k views

Kathleen asked Sep 18, 2014

38 votes

3 answers

4654

GATE CSE 2004 | Question: 54
$A$ and $B$ are the only two stations on an Ethernet. Each has a steady queue of frames to send. Both $A$ and $B$ attempt to transmit a frame, collide, and $A$ wins the first backoff race. At the end of this successful transmission by $A$, both $A$ ... attempt to transmit and collide. The probability that $A$ wins the second backoff race is: $0.5$ $0.625$ $0.75$ $1.0$

$A$ and $B$ are the only two stations on an Ethernet. Each has a steady queue of frames to send. Both $A$ and $B$ attempt to transmit a frame, collide, and $A$ wins the f...

16.9k views

Kathleen asked Sep 18, 2014

24 votes

3 answers

4655

GATE CSE 2004 | Question: 22
How many $8-bi$t characters can be transmitted per second over a $9600$ baud serial communication link using asynchronous mode of transmission with one start bit, eight data bits, two stop bits and one parity bit? $600$ $800$ $876$ $1200$

How many $8-bi$t characters can be transmitted per second over a $9600$ baud serial communication link using asynchronous mode of transmission with one start bit, eight d...

15.8k views

Kathleen asked Sep 18, 2014

21 votes

2 answers

4656

GATE CSE 2004 | Question: 16
Which of the following is NOT true with respect to a transparent bridge and a router? Both bridge and router selectively forward data packets A bridge uses IP addresses while a router uses MAC addresses A bridge builds up its routing table by inspecting incoming packets A router can connect between a LAN and a WAN

Which of the following is NOT true with respect to a transparent bridge and a router?Both bridge and router selectively forward data packetsA bridge uses IP addresses whi...

10.2k views

Kathleen asked Sep 18, 2014

28 votes

5 answers

4657

GATE CSE 2004 | Question: 15
Choose the best matching between $\text{Group 1}$ and $\text{Group 2}$ ... $\text{P-2, Q-4, R-1}$ $\text{P-2, Q-3, R-1}$ $\text{P-1, Q-3, R-2}$

Choose the best matching between $\text{Group 1}$ and $\text{Group 2}$$$\begin{array}{|l|l|}\hline \textbf{Group-1} & \textbf{Group-2} \\\hline \text{P. Data link layer}...

7.2k views

Kathleen asked Sep 18, 2014

78 votes

7 answers

4658

GATE CSE 2003 | Question: 84
Host $A$ is sending data to host $B$ over a full duplex link. $A$ and $B$ are using the sliding window protocol for flow control. The send and receive window sizes are $5$ packets each. Data packets (sent only from $A$ to $B$) are all $1000$ bytes long and the ... ? $7.69 \times 10^6$ Bps $11.11 \times 10^6$ Bps $12.33 \times 10^6$ Bps $15.00 \times 10^6$ Bps

Host $A$ is sending data to host $B$ over a full duplex link. $A$ and $B$ are using the sliding window protocol for flow control. The send and receive window sizes are $5...

28.1k views

Kathleen asked Sep 17, 2014

25 votes

6 answers

4659

GATE CSE 2003 | Question: 83
A $2$ $km$ long broadcast LAN has $10^7$ bps bandwidth and uses CSMA/CD. The signal travels along the wire at $2 \times 10^8$ m/s. What is the minimum packet size that can be used on this network? $50$ $\text{bytes}$ $100$ $\text{bytes}$ $200$ $\text{bytes}$ None of the above

A $2$ $km$ long broadcast LAN has $10^7$ bps bandwidth and uses CSMA/CD. The signal travels along the wire at $2 \times 10^8$ m/s. What is the minimum packet size that ca...

13.8k views

Kathleen asked Sep 17, 2014

56 votes

6 answers

4660

GATE CSE 2003 | Question: 82, ISRO2009-1
The subnet mask for a particular network is $255.255.31.0.$ Which of the following pairs of $\text{IP}$ addresses could belong to this network? $172.57.88.62$ and $172.56.87.23$ $10.35.28.2$ and $10.35.29.4$ $191.203.31.87$ and $191.234.31.88$ $128.8.129.43$ and $128.8.161.55$

The subnet mask for a particular network is $255.255.31.0.$ Which of the following pairs of $\text{IP}$ addresses could belong to this network?$172.57.88.62$ and $172.56....

29.2k views

Kathleen asked Sep 17, 2014

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