Question

Please answer following short parts for Upvote (please answer all)

a) Which layer of the TCP/IP model implements the Network Address Translation protocol?

b) What are the advantages and disadvantages of Network Address Translation?

c) How is SNAT different than NAT?  

d) Explain the reasons why or why not the Network Translation Protocol may increase network security?  

e) What is the difference between a TCP port and an IP Network address?

f)

List the advantages and Disadvantages of TCP Transport Protocol

Advantages of TCP	Disadvantages of TCP

Answer 1

a)Network layer of TCP/IP implements the Network Address Translation protocol

b) Advantages of NAT:

• NAT is mainly used to prevent the shortage of IPV4 addresses.
• It can provide additional security by making source and destn address hidden.

Disadvantages of NAT:

• NAT is resource intensive mainly processor and memory intensive since it needs to translate all incoming IPV4 address for all incoming and outgoing datagrams.
• NAT causes delay in IPV4 communication.
• NAT configured network may impose compatibility issues for underlying applications.

c)SNAT is nothing but a source network address translation it is used when private host wants to start a session with outside network(public host) here the source private Ip address is changed to some public address.

d)Originally NAT was introduced to tackle the problem of IP address scarcity but inaddition to this it also provided an additional layer of security.Let me explain how:

suppose an organisation wants to assign some private addresses to its computers which are hidden from outside world if any of these computers need to communicate with a server present outside these private IP addresses cant be used for this NAT translates this private address to a public address which is common to the organisation .So whenever communication is made to external server only the public address is used for that similarly the reponse from the server will be sent to this public address.Thereby hiding these computers from external world.

e)A TCP port/port is address of layer 4 protocols which is used to identify the service running on the system.

Ip address is a unique address assigned to a host for its identification in a network.

f)Advantages of TCP:

• TCP makes sure that data reaches its destination in time without any duplication.
• TCP is mainly used for web surfing and the job of breaking up packets of data is done by TCP(os) for you.
• TCP is suitable for large set of data where the security of data is of utmost priority

Disadvantages of TCP:

• TCP is slower compared to UDP.
• TCP cant be used for broadcasting and multicasting.