Test: Security & Application Layer- 2 - Computer Science Engineering (CSE) MCQ

E-mail is a method of exchanging digital messages between people using digital devices. Size of E-mail is typically from 1 KB to 20 MB. So it does not require high speed communication equipment.

ipcon fig.exe: ipconfig.exe command line tool used to display the current transmission control protocol/internet protocol configuration, with use of this command we can determine weather configuration is initialized or duplicate IP address is configured on our system, ping .exe: computer network software utility used to test the reachability of host on a IP network, arp.exe: is a address resolution protocol which need to find ethernet address (MAC) for corresponding IP address.

In message switching mechanism, a node (usually a special computer with a number of disks)- receives a message, stores it until the appropriate route is free, then sends it along that route.

S im ple netw ork management protocol is a protocol for network management and is used for collecting information from and configuration, network devices, such as servers, printers, hubs, switches and routers on an IP network.

ARP is address resolution protocol used to find MAC address for corresponding IP address.

The secret key encryption algorithm are often referred to as symmetric encryption algorithms because the same secret key can be used in bidirectional communication sender and receiver.

In public key encryption/decryption, there are two keys: a private key and a public key. The private key is kept by receiver. The public key is announced to the public.

Transport layer protocol taken care of both error control and flow control at source to destination level.

Application layer deals with file system transfer, virtual terminals implementation and inter process communication.

Vertical redundancy check (VRC), often called a parity check. In this, a redundant bit, called parity bit, is appended to every data unit so that total number of 1 ’s in unit becomes even (including the parity bit).

Bridge operates at physical layer and router operates at network layer

Machine connected to the internet may use the ARP when it want to use the data link layer.

PING is a command which is used to check the particular port is working or not by sending echo frame and receiving echo response in specified time.

Domain Name System (DNS) maps a name onto an IP address, an application program calls a library procedure called the resolver, passing name as a parameter. The resolver sends a UDP packet to a load DNS server, which then looks up the name and returns the IP address to the resolver, which then returns it to caller.
So DNS uses transport layer protocol UDP

IMAP : It distributes mail boxes across multiple servers
FTP: Requires two ports: 20 and 21 for FTP-data and FTP-control respectively.
HTTP: HTTP is a stateless protocol. Hence not a state sensitive protocol.
DNS: This protocol maintains it’s database is a structured and hierarchia! manner.
SMTP: Intersect standard for e-mail transmission and not suitable for client server communication.