4.b -TCP/IP Network Model

Question 1

TCP/IP Network Models

Answer 1

Consist of four layers where each layer is used to manage some aspect of the transmission, or delivery of data over a network.

Question 2

Layered model

Answer 2

A layer receives services from the next lowest layer and provides services to the next higher layer

Question 3

TCP/IP layer models and memory aid

LITA

Answer 3

• Link
• Internet
• Transport
• Application

Question 4

What is abstraction

Answer 4

One of the primary purposes of the layered model ( In both the OSI and TCP/IP models) is to permit abstraction; each layer needs to be concerned only with its own delivery characteristics,,while permitting other layers to manage their own matters.

Question 5

TCP/IP Link layer

Answer 5

It’s the lowest layer. Its purpose is the delivery of message (usually called frames) from one station to another on a local network. It’s provides service to the Transport layer

Question 6

TCP/IP Link layer tasks

Answer 6

It’s the physical layer of the networks, and is usually implemented in the form of hardware network adaptors.

Question 7

TCP/IP Internet Layer

Answer 7

It’s the foundation layer of TCP/IP. The purpose of this layer is the delivery of messages (called packets) from one station to another on the same network or on different networks.

The internet layer receives services from the link layer and provides services to the transport layer

Question 8

Common protocols in the TCP/IP Internet layer

Answer 8

• Primary protocol is the Internet protocol (IP).
• Other protocols : ICMP (Internet Control Message Protocol) , a diagnostic protocol used to send error messages and other diagnostics messages over networks.

Question 9

Devices at the TCP/IP Internet Layer

Answer 9

• Hosts : computers that could be functioning as servers or workstation. They communicate by creating messages that they send on the network
• Routers: Computers that forward packet form one network or host to another.

Question 10

TCP/IP transport layer

Answer 10

Receives services from the internet layer and provides services to the application layer.
It includes two main packets transport protocols (TCP and UDP)

Question 11

Port Number

Answer 11

Signify the type of message that is being sent.

Question 12

TCP/IP application layer

Answer 12

It’s the topmost layer of the TCP/IP model. The application layer receives services from the transport layer and may communicate directly with end users.

Question 13

Programs of the application layer

Answer 13

DNS, SNMP, DHCP, SMTP, NNTP, HTTP, HTTPS, NGS, FTP, and Telnet.