Chapter 1

Question 1

Adjacent-layer interaction

Answer 1

The process of HTTP asking TCP to send some data and making sure that it is received correctly

Question 2

Enterprise Network

Answer 2

A network created by one corporation or enterprise, for the purpose of allowing its employees to communicate
connects to at least one ISP using WAN links

Question 3

SOHO

Answer 3

Small office/home office
Second major branch of networking
Uses the same concepts, protocols and devices used to create enterprise networks
Allows a user to connect to the Internet using a PC and any Internet connection
User can sit at home or in office and communicate with servers at the enterprise

Question 4

Networking Model

Answer 4

Networking architecture
An organized set of documents that describe one small function required for a network
May define a protocol

Question 5

Protocol

Answer 5

a set of logical rules that devices must follow to communicate

Question 6

TCP/IP

Answer 6

defines a large collection of protocols that allow computers to communicate
Defines the details of each of these protocols inside documents called Requests for Comments
Each layer provides a service to the layer above it

Question 7

TCP/IP Layers

Answer 7

Application
Transport
Internet
Network access

Question 8

TCP/IP Application Layer

Answer 8

provide services to the application software running on a computer
defines services the application needs
provides an interface between software running on a computer and the network itself

Question 9

TCP/IP Transport Layer

Answer 9

consists of two main protocol options which are TCP and UDP

helps to guarantee delivery of the data across a network through acknowledgments

Question 10

What is the concept when two computers use a protocol (an agreed-to set of rules) to communicate with the same layer on another computer?

Answer 10

Same layer interaction on different computers.

Question 11

What is the concept when on a single computer, one layer provides a service to a higher layer?

Answer 11

Adjacent-layer interaction on the same computer.

Question 12

What is the final product of the 5 steps of encapsulation and where do each of the inputs come from?

Answer 12

DL-IP-TCP-Data-DL

Question 13

What is the data encapsulated in the transport layer called?

Answer 13

Segment

Question 14

What is the data encapsulated in the network layer called?

Answer 14

Packet

Question 15

What is the data encapsulated in the data link layer called?

Answer 15

Frame

Question 16

Which layer encapsulates data with both a header and a trailer?

Answer 16

Data link adds both a header and a trailer

Question 17

What are the 7 layers of the OSI Model?

Answer 17

7. Application
8. Presentation
9. Session
10. Transport
11. Network
12. Data Link
13. Physical

Question 18

What are the 5 layers of the TCP/IP Model?

Answer 18

5. Application
6. Transport
7. Network
8. Data Link
9. Physical

Question 19

What are 6 benefits of a layered protocol specification?

Answer 19

1. Less complex
2. Standard interfaces - Allowing multiple vendors to create products that fill a particular role
3. Easier to learn
4. Easier to develop - Reduced complexity allows easier program changes and faster product development.
5. Multivendor interoperability - Creating products to meet the same networking standards means that computers and network gear from multiple vendors can work in the same network.
6. Modular engineering - One vendor can write software that implements higher layers

Question 20

The TCP/IP model uses terms like segment, packet, and frame. What terms does the OSI model use?

Answer 20

PDU or protocol data unit

Question 21

What is the term that refers to the process of putting headers (and sometimes trailers) around some data?

Answer 21

encapsulation