Test: Security & Application Layer- 1 - Computer Science Engineering (CSE) MCQ

WAN is used to connect LAN’s and other types of network, its working includes satellites, frame way and asynchronous transfer mode.

Domain Name Servers (DNS) maintain a directory of domain names and translate them to IP addresses. This is vital because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses.

Baud rate is the number of signals units per second that are required to represents the bits transmitted during one second.

Protocol does not implement all the services but there are some mandatory services as in data link layer, error, control is mandatory service.

Presentation layer is OS! model is responsible for data compression and decompression of data.

So dividend at receiver end = 100111001011.

IP is a network layer protocol.

The encryption afgorithm and public key are publicly announced. The decryption algorithm and private key are kept secret.

• Circuit switching has 3 phase: connection establishment, Data transfer and tear down, while packet switching has only one phase data transfer based on routing,
• Circuit switching has less variation in packets than packet switching.
• Circuit switching send packet in order, while packet switching send out of order, so reordering needs in packet switching.
• In packet switching no resource reservation needed while circuit switching has resource reservation so packet switching leads to better utilization of resources i.e. bandwidth.
• In circuit switching no packet processing needed at intermediate path routers while in packet switching needed. So, packet switching require more packet processing time than circuit switching.

in public key cryptography if sender uses receiver’s public key for encryption then the decryption of message is possible only by using private key of receiver.
Hence 1^st is true and remaining are false.
If sender encrypts using his receiver public key then no one except the receiver can decrypt it since only receiver knows his private key no one else.