Which layer 4 protocol is used for a Telnet connection?

Correct Answer: Physical layer

Explanation:

Hubs are specified or operate at Layer1 i.e, the physical layer in the OSI model. Hubs regenerate electrical signals. A hub sends data packets (frames) to all devices on a network, regardless of any MAC addresses contained in the data packet.

Correct Answer: The degeneration of a signal over distance on a network cable is called attenuation

Correct Answer: Bit rate is the number of bits transmitted during one second whereas baud rate refers to the number of signal units per second that are required to represent those bits baud rate = bit rate / N where N is no-of-bits represented by each signal shift

Correct Answer: ICMP is Internet Control Message Protocol, a network layer protocol of the TCP/IP suite used by hosts and gateways to send notification of datagram problems back to the sender It uses the echo test / reply to test whether a destination is reachable and responding It also handles both control and error messages

Correct Answer: The header should have a minimum length of 20 bytes and can have a maximum length of 60 bytes

Correct Answer: 32 bits

Explanation:

Internet Protocol version 4 (IPv4) which defined an IP address as a 32-bit value

IPv4 is in contrast to IPv6, which defined an IP address as a 128 bits value.

Correct Answer: 48

Explanation:

MAC - Media Access Control, address is a globally unique identifier assigned to network devices, and therefore it is often referred to as hardware or physical address.

 

MAC addresses are 6-byte (48-bits) in length, and are written in MM:MM:MM:SS:SS:SS format.

Correct Answer: Thrashing is caused by under allocation of the minimum number of pages required by a process, forcing it to continuously page fault The system can detect thrashing by evaluating the level of CPU utilization as compared to the level of multiprogramming It can be eliminated by reducing the level of multiprogramming

Correct Answer: Also called FIFO anomaly Usually, on increasing the number of frames allocated to a process virtual memory, the process execution is faster, because fewer page faults occur Sometimes, the reverse happens, ie, the execution time increases even when more frames are allocated to the process This is Belady's Anomaly This is true for certain page reference patterns

Correct Answer: - Normal completion - Time limit exceeded - Memory unavailable - Bounds violation - Protection error - Arithmetic error - Time overrun - I/O failure - Invalid instruction - Privileged instruction - Data misuse - Operator or OS intervention - Parent termination