In asymmetric key cryptography, for confidentiality the private key is kept by:

Which one of the following algorithm is used in asymmetric-key cryptography?

What is data encryption standard (DES)?

Cryptanalysis is used:

Which one of the following is a cryptographic protocol used to secure HTTP connection?

Which one of the following is not a function of network layer?

ICMP is primarily used for:

Frames from one LAN can be transmitted to another LAN via the device

Which of the following condition is true if two frames are placed over a medium at the same time?

What is the default subnet mask for a class C network?

The Internet Control Message Protocol (ICMP)

The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In half duplex data transmission, both the sender and the receiver

Which of the following technique is used for fragment?

When you ping the loopback address, a packet is sent where?

Which one is loopback address in IPv4 ?

Which of the following TCP/IP protocol is used for transferring electronic mail messages from one machine to another?

What part of 192.168.10.51 is the Network ID, assuming a default subnet mask?

A noiseless 3 KHz Channel transmits bits with binary level signals. What is the maximum data rate?

In CRC there is no error if the remainder at the receiver is _____.

How many bits internet address is assigned to each host on a TCP/IP internet which is using IPv6 standard?

FDDI is a

You are working with a network that has the network ID 192.168.10.0. What subnet should you use that supports up to 25 hosts and a maximum number of subnets?

An endpoint of an inter-process communication flow across a computer network is called:

Transport layer protocols deals with:

Which multiplexing technique transmits digital signals ?

If there are n signal sources of same data rate than TDM link has _______ equal slots.

The protocol data unit(PDU) for the application layer in the Internet stack is

In the IPv4 addressing format, the number of networks allowed under Class C addresses is

An Internet Service Provider(ISP) has the following chunk of CIDR-based IP addresses available with it:245.248.128.0/20. The ISP wants to give half of this chunk of addreses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of addresses to A and B?

Consider a source computer (S) transmitting a file of size 106 bits to a destination computer (D) over a network of two routers (R1 and R2) and three links (L1, L2 and L3). L1 connects S to R1;L2 connects R1 to R2; and L3 connects R2 to D. Let each link be of length 100km. Assume signals travel over each link at a speed of 10^8 meters per second. Assume that the link bandwidth on each link is 1Mbps. Let the file be broken down into 1000 packets each of size 1000 bits. Find the total sum of transmission and propagation delays in transmitting the file from S to D?

Consider an instance of TCP’s Additive Increase Multiplicative Decrease(AIMD) algorithm where the window size at the start of the slow start phase is 2 MSS and the threshold at the start of the first transmission is 8 MSS. Assume that a time out occurs during the fifth transmission. Find the congestion window size at the end of the tenth transmission.

One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field?

In the slow start phase of the TCP congestion control algorithm, the size of the congestion window

If a class B network on the Internet has a subnet mask of 255.255.248.0, what is the maximum number of hosts per subnet?

The address resolution protocol (ARP) is used for:

The maximum window size for data transmission using the selective reject(Selective repeat) protocol with n-bit frame sequence numbers is:

Which of the following is not true about Subnetting?

A router receives an IP packet containing a data of 300 byte and it is forwarded to a network with maximum transmission unit of 80 bytes. Assume that IP header is 10 Byte long. Find the total fragment , more fragment and offset values

A channel has a bit rate of 4 Kbps and one way propagation delay of 20 msec. The channel uses

stop and wait protocol. The transmission time of the acknowledgement frame is negligible. To

get a channel efficiency of at least 50%, the minimum frame size should be-

Station A uses 32 byte packets to transmit messages to Station B using a sliding window protocol. The round trip delay between A and B is 80 milliseconds and the bottleneck bandwidth on the path between A and B is 128 kbps. What is the optimal window size that A should use?

The address of a class B host is to be split into subnets with a 6-bit subnet number. What is the maximum number of subnets and the maximum number of hosts in each subnet?

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:

If link transmits 4000 frames per second, and each slot has 8 bits, the transmission rate of circuit this TDM is

The entire hostname (in DNS) has a maximum of ___________ characters

Which one of the following is not true?

In open-loop control, policies are applied to __________

In Go-Back-N window, when the timer of the packet times out, several packets have to be resent even some may have arrived safe. Whereas in Selective Repeat window, the sender resends ___________

The technique in which a congested node stops receiving data from the immediate upstream node or nodes is called as _______

Let the size of congestion window of a TCP connection be 32 KB when a timeout occurs. The round trip time of the connection is 100 msec and the maximum segment size used is 2 KB. The time taken (in msec) by the TCP connection to get back to 32 KB congestion window is _________.