Network Security 2 - Transport Layer

Question 1

What protocol are used in transport layer ?

Answer 1

TCP & UDP

Question 2

What is TCP ?

Answer 2

Transmission control protocol,

Question 3

What is udp?

Answer 3

User datagram protocol
Connectionless protocol,
No flow control
no Congestion n control
Particularly used in streaming multimedia apps, DNS, snmp

Question 4

What is SNMP ?

Answer 4

Simple Network Management Protocol how are you Babu Meri Lag Gaya Nishana simple network management protocol user datagram protocol

Question 5

What does Flow Control do in TCP?

Answer 5

1. Eliminates possibility of sender overflowing the receivers buffer .
2. Controlled the rate at which data are exchanged

Question 6

Which layer provides Flow control ?

Answer 6

The logical link control sublayer LLC provides flow control .

Question 7

Where is TCP flow control defined ?

Answer 7

Defined in IEEE 802.2.

Question 8

What is Receive buffer in TCP connection ?

Answer 8

1. Every TCP connection has a receive buffer , data is sent to this location only from host .
2. Bytes that are received in the correct sequence are stored in the receive buffer
3. Data is read by the application from this offer
4. Delay in reading this data lead to overflow of the buffer.

Question 9

What is Receive window in TCP connection ?

Answer 9

Receive window is an variable which is maintained by Sender, it shows free buffer in space in receiver,
variable is rwnd = RcvBuffer - [LastByteRcvd - LastByteRead]

Question 10

Define Flow Control ?

Answer 10

A sends large file to B over TCP
# B allocate receive buffer , RcvBuffer
The application reads from B’s buffer